Researcher Profile and Settings

Master

Affiliation (Master)

• Faculty of Science　Earth and Planetary Sciences　Earth and Planetary System Science

Affiliation (Master)

• Faculty of Science　Earth and Planetary Sciences　Earth and Planetary System Science

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Profile and Settings

Affiliation

• Hokkaido University

Profile and Settings

• Name (Japanese)

  Watanabe

• Name (Kana)

  Tsuyoshi

• Name

  201301003710752869

Alternate Names

http://kaken.nii.ac.jp/d/r/80396283.ja.html

Affiliation

• Hokkaido University

Achievement

Research Interests

• 温度変化   サンゴ掘削   熱水活動   造礁性サンゴ骨格   古海洋   津波   微量元素濃度   中期鮮新世   安定同位体比   エルニーニョ   サンゴ骨格   中期鮮新世温暖期   酸素同位体比   エルニーニョ現象   地震   新生代   サンゴ   大気二酸化炭素固定   東南アジア熱帯島嶼   インドネシア   炭素同位体比   リズム   進化   酸素安定同位体   複合影響   陸上植生   サンゴ年輪   水循環   フィリピン   

Research Areas

• Natural sciences / Biogeoscience
• Natural sciences / Space and planetary science
• Environmental science/Agricultural science / Environmental dynamics
• Natural sciences / Solid earth science

Research Experience

• 2023/09 - Today The Graduate University for Advanced Studies
• 2023/09 - Today 名古屋大学環境学研究科 客員准教授
• 2023/09 - Today 総合地球環境学研究所 研究部 准教授
• 2014 - Today 喜界島サンゴ礁科学研究所 理事長
• 2007 - Today 北海道大学 理学(系)研究科(研究院) 講師
• 2020/04 - 2023/08 総合地球環境学研究所 客員准教授
• 2022 - 2023 中国地質大学北京校 非常勤講師
• 2022 - 2023 The University of Tokyo
• 2016 - 2018 University of Hawaii
• 2015 - 2016 Hiroshima University
• 2013 - 2014 Osaka City University
• 2012 - 2013 アーヘン工科大学地質研究所 客員研究員
• 2012 - 2013 Tohoku University
• 2003 - 2004 日本学術振興会海外特別研究員/仏国立科学研究所博士研究員
• 2003 - 2004 東京大学海洋研究所 産学官連携研究員
• 2000 - 2002 日本学術振興会特別研究員(PD)/オーストラリア国立大学客員研究員
• 1999 - 2000 地質調査所海洋地質部非常勤職員

Education

•        - 1999  Hokkaido University
•        - 1996  Hokkaido University
•        - 1994  Hokkaido University  School of Science

Awards

• 2008 Japanese Coral Reef Society Kawaguchi Award
   

  受賞者: Tsuyoshi Watanabe
• 2008 日本サンゴ礁学会 川口賞
   

  受賞者: 渡邊剛
• 2004 Geochemical society of Japan Young scientist Award
   

  受賞者: Tsuyoshi Watanabe
• 2004 日本地球化学会 奨励賞
   

  受賞者: 渡邊剛

Published Papers

• Development and Novel Applications of Geochemical Proxies in Marine and Terrestrial Carbonate Records

  Johan Schijf, Ed C. Hathorne, K. Halimeda Kilbourne, Tsuyoshi Watanabe

  Frontiers in Marine Science 2024/10/22 [Refereed]
  
• Regime shift of skeletal δ13C after 1997/1998 El Nino event in Porites coral from Green Island, Taiwan

  Masataka Ikeda, Atsuko Yamazaki, Kazuto Ohmori, Hong-Wei Chiang, Chuan-Chou Shen, Tsuyoshi Watanabe

  Scientific Reports 14 (1) 2024/10/07 [Refereed]
  
• A sub-fossil coral Sr/Ca record documents meridional variability of the Intertropical Convergence Zone in the eastern Indian Ocean

  Miriam Pfeiffer, Hideko Takayanagi, Lars Reuning, Takaaki Konabe Watanabe, Saori Ito, Dieter Garbe-Schönberg, Tsuyoshi Watanabe, Chung-Che Wu, Chuan-Chou Shen, Jens Zinke, Geert-Jan Brummer, Sri Yudawati Cahyarini

  Climate of the Past 2024/04/15 [Refereed]
   

  Abstract. Sea surface temperature (SST) variability in the south-eastern tropical Indian Ocean is crucial for rainfall variability in Indian Ocean rim countries. A large body of literature has focused on zonal variability associated with the Indian Ocean Dipole (IOD), but it is unclear whether meridional shifts in the position of the Intertropical Convergence Zone (ITCZ), which at present co-vary with the IOD, may also occur independently. We have developed a new, monthly resolved Sr/Ca record from a sub-fossil coral cored at Enggano Island (Indonesia, 5° S, 102° E). Core sections containing diagenetic phases are omitted from the SST reconstruction. U/Th dating shows that the Sr/Ca-based SST record extends from 1917–1868 and from 1861–1823 with a relative age uncertainty of ±2.4 years (2σ). At Enggano Island, coastal upwelling and cooling in austral spring is coupled to the position of the ITCZ, and impacts SST seasonality. The sub-fossil coral indicates an increase in SST seasonality due to enhanced austral spring cooling between 1917 and 1855, which we attribute to stronger SE winds and a northward shift in the position of the ITCZ in austral spring. A nearby sediment core indicates SST cooling and a shallowing of the thermocline prior to ~1930. These results are consistent with an increase in the North-South SST gradient in the eastern Indian Ocean calculated from historical temperature data, that is not seen in the zonal SST gradient. We conclude that the relationship between meridional and zonal variability in the eastern Indian Ocean is non-stationary and influenced by long-term temperature trends.
• Coral Ba/Ca reflected the past earthquake and tsunami on Kikai Island in 1911

  Saori Ito, Tsuyoshi Watanabe

  Preprint at EarthArxiv 2024/03/20 [Not refereed]
   

  Natural disasters like earthquakes and tsunamis significantly affect coral reefs and marine ecosystems. The Ryukyu Islands, including Kikai Island and the surrounding coral reefs, face the potential risk of experiencing a significant earthquake with Mw > 8. While historical records offer insights into past tsunami occurrences, there is scarce observation or quantitative data on the impacts of seismic events on the reef ecosystems. Here, we show the environmental impact of the 1911 Kikai Island Earthquake and Tsunami on coral reef ecosystems using coral skeletal geochemical proxies with weekly-to-bi-weekly temporal resolution, particularly focusing on the coral barium/calcium ratios (Ba/Ca). Analysis of a sub-fossil Porites coral specimen collected from Shiomichi Bay, eastern Kikai Island, revealed an anomalous peak in Ba/Ca ratios following the earthquake and tsunami event, indicating increased sediment load in seawater. This anomaly persisted for approximately two months post-earthquake, highlighting the prolonged effect of the tsunami on coral reef environments. Other coral geochemical proxies, such as coral strontium/calcium ratios (Sr/Ca), magnesium/calcium ratios (Mg/Ca), oxygen (δ18Ocoral) and carbon stable isotopes (δ13Ccoral) and oxygen isotopes in seawater (δ18Osw) showed no anomalous change corresponding to the event. Despite the disturbance, the coral growth rate did not show an exceptionally low value, suggesting that the event may not have been catastrophic enough to have a severe impact. Our findings underscore the utility of coral Ba/Ca ratios in assessing historical variations in sediment concentrations associated with seismic events and provide valuable insights into the environmental impacts of tsunamis on coastal ecosystems.
• The Northwestern Pacific corals unravel the NPGO/Victoria Mode-related temperature back to the 19th century

  Saori Ito, Takaaki K. Watanabe, Atsuko Yamazaki, Chuan-Chou Shen, Tsuyoshi Watanabe

  PREPRINT (Version 1) available at Research Square 2024/01/18 [Not refereed]
   

  Abstract The atmospheric and oceanic phenomena in the Pacific Ocean, such as the North Pacific Gyre Oscillation (NPGO) and the Victoria Mode (VM), have significant implications for global climate change patterns. Although the relationship between surface temperature changes in the Central Pacific warming pool (CPW-ST), NPGO and VM has recently attracted attention, the historical relationships over the centuries remain unknown due to limited instrumental observations. Here, we present a long-term NPGO/VM-related temperature variability based on the Northwestern Pacific coral proxy from 1798 to 2014 AD. The coral skeletal Sr/Ca-inferred temperature record matched the CPW-ST time series, revealing extra-tropical propagation of NPGO/VM-related temperature variation from the central Pacific through an ocean-atmosphere bridge. Furthermore, we identified distinct negative NPGO/low-temperature phases in the late 1840s and during the 1860s-1900s and a positive NPGO/high-temperature phase in the 2000s-2010s. Additionally, a significant correlation between CPW-ST and high-frequency NPGO/VM variability was observed in the past 200 years. Our coral record indicates that the relationship lasted until the 1930s, except from the 1970s to the 1990s, and has strengthened from the 2000s to the present. The coral-based temperature record from the Northwestern Pacific provides important insights into the historical spatiotemporal changes in NPGO/VM-related temperature variability.
• Calibration of Sr/Ca Ratio and In Situ Temperature Using Hawaiian Corals

  Ryohei Uchiyama, Tsuyoshi Watanabe, Samuel E. Kahng, Atsuko Yamazaki

  Geochemistry, Geophysics, Geosystems 24 (10) 1525-2027 2023/10/25 

  Abstract The Sr/Ca ratio of modern coral skeletons can record local seawater temperature (T) and is an important tool for reconstructing past environments. However, site‐specific calibrations are required to ensure accurate temperature reconstructions. Here, we examine three modern coral skeletons collected at contrasting sites on the island of Oahu, Hawaii to establish the first accurate calibrations for this region and investigate site specific influences on the calibration process. Satellite T data, which is used for many calibrations, may not be able to derive an accurate thermometer. For our shallow lagoonal sites, satellite T had smaller seasonal T ranges, which resulted in significantly higher slopes of Sr/Ca‐T compared to using in situ T. The traditional age model based on aligning only min/max values can lead to errors in the Sr/Ca‐T calibration due to variable growth rates. An enhanced age model which adds midpoint alignments between the min/max peak values can account for seasonal changes in growth rate and reduce the error. On the same island, site‐ and time period specific conditions can cause notable differences in the Sr/Ca‐T calibrations. The coral from an estuarine embayment showed a high Sr/Ca offset, likely due to high Sr/Ca in ambient seawater. For corals which experienced thermal stress, lower slopes were observed probably due to elevated Sr/Ca values during the period of thermal stress.
• Calcification rates in the lower photic zone and their ecological implications

  Sam Kahng, Takumi Kishi, Ryohei Uchiyama, Tsuyoshi Watanabe

  Coral Reefs 0722-4028 2023/08/12 [Refereed]
  
• Hydroclimate seasonality from paired coral Sr/Ca and δ18O records of Kikai Island, Southern Japan: Evidence of East Asian monsoon during mid-to late Holocene

  Kevin L. Garas, Tsuyoshi Watanabe, Atsuko Yamazaki

  Quaternary Science Reviews 301 107926 - 107926 0277-3791 2023/02 [Refereed]
  
• Tracking westerly wind directions over Europe since the middle Holocene

  Hsun-Ming Hu, Valerie Trouet, Christoph Spötl, Hsien-Chen Tsai, Wei-Yi Chien, Wen-Hui Sung, Véronique Michel, Jin-Yi Yu, Patricia Valensi, Xiuyang Jiang, Fucai Duan, Yongjin Wang, Horng-Sheng Mii, Yu-Min Chou, Mahjoor Ahmad Lone, Chung-Che Wu, Elisabetta Starnini, Marta Zunino, Takaaki K. Watanabe, Tsuyoshi Watanabe, Huang-Hsiung Hsu, G.W.K. Moore, Giovanni Zanchetta, Carlos Pérez-Mejías, Shih-Yu Lee, Chuan-Chou Shen

  Nature Communications 13 (1) 2022/12/21 [Refereed]
   

  Abstract The variability of the northern westerlies has been considered as one of the key elements for modern and past climate evolution. Their multiscale behavior and underlying control mechanisms, however, are incompletely understood, owing to the complex dynamics of Atlantic sea-level pressures. Here, we present a multi-annually resolved record of the westerly drift over the past 6,500 years from northern Italy. In combination with more than 20 other westerly-sensitive records, our results depict the non-stationary westerly-affected regions over mainland Europe on multi-decadal to multi-centennial time scales, showing that the direction of the westerlies has changed with respect to the migrations of the North Atlantic centers of action since the middle Holocene. Our findings suggest the crucial role of the migrations of the North Atlantic dipole in modulating the westerly-affected domain over Europe, possibly modulated by Atlantic Ocean variability.
• Nonstationary footprints of ENSO in the Mekong River Delta hydrology

  Takaaki K. Watanabe, Tung Thanh Phan, Atsuko Yamazaki, Hong-Wei Chiang, Chuan-Chou Shen, Lam Dinh Doan, Tsuyoshi Watanabe

  Scientific Reports 12 (1) 2022/12/07 [Refereed]
   

  Abstract The Mekong River Delta (MRD) is an essential agricultural area for the worldwide rice supply. Floods and droughts triggered by El Niño southern oscillation (ENSO) have been threatening sustenance in the MRD. Sustainable food supplies require understanding the response of the MRD hydrology to the changing ENSO behaviour in recent decades. Here, we reconstructed the annual rainfall maxima in the MRD using the oceanic paleoclimate proxy from coral skeletons and compared them with ENSO indexes. Annual minima of coral-based seawater oxygen isotope (δ¹⁸O_sw) correlated with annual rainfall maxima, which allowed to extend rainfall data from 1924 to the recent. The annual rainfall maxima based on δ¹⁸O_sw negatively correlated with the central Pacific El Niño index. This suggested that La Niña and central Pacific El Niño events lead to heavy and light rainy seasons. The heavy rainy season had more serious impacts in recent decades, which likely increases the flood risk. In contrast, the frequency and rainfall amount of the light rainy season has not changed significantly, although a catastrophic drought has hit the MRD. Our finding concludes that the impact of the ENSO event on MRD hydrology is inconsistent in the past century.
• Coral Sr/Ca records provide realistic representation of eastern Indian Ocean cooling during extreme positive Indian Ocean Dipole events

  Miriam Pfeiffer, Takaaki Konabe Watanabe, Hideko Takayanagi, Sri Yudawati Cahyarini, Dieter Garbe-Schönberg, Tsuyoshi Watanabe

  Scientific Reports 12 (1) 2022/06 [Refereed]
   

  Abstract Extreme positive Indian Ocean Dipole (pIOD) events are amplified by non-linear ocean–atmosphere interactions and are characterized by pronounced cooling in the eastern equatorial Indian Ocean. These non-linear feedbacks are not adequately represented in historical products of sea surface temperatures that underestimate the magnitude of extreme pIOD events. Here, we present a sea surface temperature (SST) reconstruction based on monthly coral Sr/Ca ratios measured in two coral cores from Enggano Island (Indonesia), that lies in the eastern pole of the IOD. The coral SST reconstruction extends from 1930 to 2008 and captures the magnitude of cooling during extreme pIOD events as shown in recent satellite and reanalysis data of SST that include ocean dynamics. The corals indicate that the 1961 pIOD event was at least as severe as the 1997 event, while the 1963 pIOD was more comparable to the 2006 event. The magnitude 1967 pIOD is difficult to assess at present due to poor replication between coral cores, and may be comparable to either 1997 or 2006. Cooling during the 1972 pIOD was short-lived and followed by pronounced warming, as seen in the moderate pIOD event of 1982. A combination of coral SST reconstructions and an extension of new reanalysis products of SST to historical time scales could help to better assess the severity and impact of past pIOD events such as the ones seen in the 1960s.
• Mineral Components of Scleractinian Coral Skeletons Cultured Without Symbionts

  S. Motai, J. Kawano, S. Harii, Y. Seto, T. Watanabe, T. Nagai

  Journal of Geophysical Research: Biogeosciences 127 (2) 2169-8953 2022/02 [Refereed]
   

  Skeletons of contemporary reef-building scleractinian corals are formed of aragonite, a polymorph of the calcium carbonate (CaCO3), notwithstanding calcite being a more stable phase under the condition of coral habitats. Circumstances developing aragonite in coral calcification have been addressed currently. Considering that the symbiotic relationship between the coral host and dinoflagellate algae (zooxanthellae) is perhaps relevant to coral calcification, we studied the impact of these symbiotic relationships on CaCO3 polymorph selection. Juvenile scleractinian corals (Acropora tenuis and Acropora digitifera) absent symbionts were cultured in seawaters with varied Mg/Ca molar ratios (mMg/Ca), and the mineral phases of the skeletons were detected employing X-ray diffraction. The findings revealed that diminutive quantities of calcite precipitated as coral skeleton in Acropora digitifera surprisingly in pseudo-present seawater (mMg/Ca similar to 5). Additionally, coral developed skeletons from only calcite in seawater with an mMg/Ca < 1. The evidence gathered in this investigation suggests that the symbiotic relationship affects the establishment of aragonite skeletons in the course of coral calcification.
• Growth Patterns and AMS-14C Age Dates of Fossil Corals from Northwest Pacific

  Garas, K. L, Watanabe, T, Yamazaki, A, Angel T, Bautista VII, Matsuzaki, H

  Philippine Journal of Science 151 317 - 332 2022/02 [Refereed]
  
• Coral Ba/Ca Analysis Using ICP‐OES With an Ultrasonic Nebulizer

  Takaaki K. Watanabe, Tsuyoshi Watanabe, Kazuto Ohmori, Atsuko Yamazaki

  Geochemistry, Geophysics, Geosystems 22 (8) 1525-2027 2021/08 [Refereed]
   

  The barium/calcium ratio (Ba/Ca) in coral skeletons has been used as a proxy to understand river floods and oceanic upwelling in the tropics and subtropics for the past centuries. Here, we establish a new method for Ba/Ca analysis using inductively coupled plasma optical emission spectrometry (ICP-OES), which has been widely used for coral proxy analyses and can save analysis time compared to other methods. We analyze Ba/Ca by combining an ultrasonic nebulizer with the intensity ratio calibration method to improve the signal intensity of Ba. Our method can determine Ba/Ca in samples with a Ca concentration of 9 mg/L with excellent analytical precision (<0.17 mu mol/mol) using ICP-OES.
• Corals Reveal an Unprecedented Decrease of Arabian Sea Upwelling During the Current Warming Era

  Takaaki K. Watanabe, Tsuyoshi Watanabe, Miriam Pfeiffer, Hsun‐Ming Hu, Chuan‐Chou Shen, Atsuko Yamazaki

  Geophysical Research Letters 48 (10) 0094-8276 2021/05/28 [Refereed]
   

  Upwelling in the Arabian Sea driven by the Indian summer monsoon pumps deep, cold, and eutrophic seawater to the sea surface every summer. The Indian summer monsoon and the Arabian Sea upwelling were expected to intensify with global warming, following the hypothesis that the Eurasian landmass would warm faster than the Indian Ocean. Contrary to expectations, the northern Indian Ocean currently warms faster than the Indian subcontinent. A weakening of the Indian summer monsoon circulation is reported, which possibly weakens the Arabian Sea upwelling. However, a lack of observations limits understanding of current and historical changes of the Arabian Sea upwelling. Here, we reconstruct the Arabian Sea upwelling over the past millennium using modern and fossil corals. Our coral records show that the Arabian Sea upwelling intensity was very stable over the last millennium and unprecedentedly declines at present. Our finding implies anthropogenic forcing likely weakens the Arabian Sea upwelling.
• Daily and annual shell growth in a long-lived freshwater bivalve as a proxy for winter snowpack

  Tsuyoshi Watanabe, Mayumi Suzuki, Yoshihiko Komoto, Kotaro Shirai, Atsuko Yamazaki

  Palaeogeography, Palaeoclimatology, Palaeoecology 569 110346 - 110346 0031-0182 2021/05 [Refereed]
   

  To assess the potential of long-lived freshwater bivalve shells as a proxy for river environments, we examined daily and annual growth increments and analysed trace elements in the shells of Margaritifera laevis collected alive from the Shiribetsu River, located in the central western region of Hokkaido, Japan. The sum of the daily growth lines within a single annual increment corresponded to the days when the average daily water temperature was greater than 9 degrees C, suggesting that shell deposition occurred from spring to autumn. The growing degree days (GDD) are correlated with the maximum snow depth in winter and the average river discharge in spring. We conducted trace element microanalysis across daily and annual growth increments by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and compared the results with in situ environmental data. Sharp peaks in the barium/calcium ratio (Ba/Ca) observed during spring river discharge also suggest that the growth of Margaritifera shells is influenced by winter snow volume and meltwater. A 67-year profile of the standard growth index (SGI) estimated from twelve individual annual growth histories correlates to the annual snowfall accumulation. Distinct decadal variability is observed in the SGI and synchronized with the North Pacific Index and Pacific Decadal Oscillation. Sclerochronological approaches using Margaritifera shells could be valuable for reconstructing river and atmospheric conditions during the winter season, which is influenced by the Asian winter monsoon in the central Hokkaido region.
• Effects of light on the Ba/Ca ratios in coral skeletons

  Atsuko Yamazaki, Megumi Yano, Saki Harii, Tsuyoshi Watanabe

  Chemical Geology 559 119911 - 119911 0009-2541 2021/01 [Refereed]
   

  The ratios of barium to calcium (Ba/Ca) in reef coral skeletons have been used as a proxy to reconstruct temporal change in barium concentration in surface ocean. To reduce the uncertainty of the coral Ba/Ca proxy, the Ba distribution coefficients between seawater and coral skeletons were determined under different light conditions. Coral planulae (Acropora tenuis) were metamorphosed and settled in dishes with commercial peptide Hym-248 in the laboratory. Juvenile corals were infected with symbiotic algae (Durusdinium sp.) and cultured in 5 Ba concentrations (5, 10, 20, 35, and 150 mol/mol) for 2 months. Half of the dishes were placed under low light conditions (10-33 mu mol m(-2) s(-1)), and another half of the dishes were placed under high light conditions (67-84 mu mol m(-2) s(-1)). The Ba/Ca ratios in the coral skeletons were highly correlated with those in ambient seawater under both high and low conditions (R-2 > 0.8). The Ba distribution coefficients between seawater with 5-35 mol/mol of Ba concentration and coral skeletons were 0.72 and 2.83 under high and low light conditions, respectively. These results suggest that biological processes related to light availability could influence to Ba/Ca-coral.
• Moderate zooxanthellate coral growth rates in the lower photic zone

  Kahng, S.E, Watanabe,T, Hu, H.-M, Watanabe, T.K, Shen, C.-C

  Coral reefs 39 (5) 1273 - 1284 0722-4028 2020/06 [Refereed]
  
• Influence of local industrial changes on reef coral calcification

  Saori Ito, Tsuyoshi Watanabe, Megumi Yano, Takaaki K. Watanabe

  Scientific Reports 10 (1) 2020/05 [Refereed]
  
• Improving analytical method of Sr/Ca ratios in coral skeletons for paleo‐ SST reconstructions using ICP‐OES

  Takaaki K. Watanabe, Tsuyoshi Watanabe, Kazuto Ohmori, Atsuko Yamazaki

  Limnology and Oceanography: Methods 18 (6) 297 - 310 1541-5856 2020/04 [Refereed]
   

  Strontium/calcium ratios (Sr/Ca) in reef coral skeletons have been used for sea surface temperature (SST) proxy. Because skeletons of reef corals are accumulated throughout more than 100 years, SST records from coral skeletons were important archives to reveal climate mechanisms. Here, we improved the coral Sr/Ca analytical method using an inductively coupled plasma optical emission spectrometer which method has advantages in terms of initial/running cost and analysis time. We checked variations of Sr and Ca sensitivities as increases of Ca concentrations using various wavelengths of Sr and Ca. Our results suggested that sensitivities of Sr/Ca in a range of coral skeletons were modulated by selections of wavelengths and sensitivity changes of Sr and Ca. A combination of Sr(421.5 nm) and Ca(373.6 nm) is stable for the Sr/Ca analysis at a low Ca concentration. A SD of Sr/Ca(421.5/373.6 nm) was 0.006 mmol mol(-1) (1 sigma, n = 40) based on the replicate measurement of the reference material (JCp-1) using our new method. By applying a Porites colony from Kikai island, Japan, a precision of reconstructed SST was over +/- 0.3 degrees C at weekly resolution.
• Coral geochemical signals and growth responses to coseismic uplift during the great Sumatran megathrust earthquakes of 2004 and 2005

  Ito, S. Yamazaki, A., Nishimura, Y., Yulianto, E., Watanabe,T

  Geochimica et Cosmochimica Acta 273 257 - 274 0016-7037 2020/03 [Refereed][Not invited]
  
• Oman corals suggest that a stronger winter shamal season caused the Akkadian Empire (Mesopotamia) collapse

  Watanabe, TK, Watanabe, T, Yamazaki, A, Pfeiffer, M

  Geology 47 (12) 1141 - 1145 0091-7613 2019/10 [Refereed][Not invited]
   

  The Akkadian Empire was the first united empire in Mesopotamia and was established at 4.6 kyr B.P. (where present is A.D. 1950). The empire abruptly collapsed in 4.2 +/- 0.2 kyr B.P. Seasonal-scale climatic dynamics behind this collapse have not yet been resolved. Here, we present monthly climatic parameters (temperature and hydrology) inferred from fossil Omani corals that lived between 4.5 and 2.9 kyr B.P. Winter temperatures derived from a modern Omani coral correlate with winter shamal (western Asian dust storm) frequency. A fossil coral from 4.1 kyr B.P. shows a prolonged winter shamal season with frequent shamal days. This likely caused agricultural failures in Mesopotamia and contributed to the Akkadian Empire collapse, as this region depends on winter rainfall.
• Coral biomineralization and carbon cycle

  Watanabe, T, Yamazaki, A

  Journal of the Japanese Association for Crystal Growth 46 (3) 46-3-06  2188-7268 2019 [Refereed][Not invited]
  
• The role of researchers connecting local community and coral reefs: its possibility and difficulty

  Satoh, N, Nakai, T, Taniguchi, H, Watanabe, T, Nakachi, S

  Journal of the Japanese Coral Reef Society 日本サンゴ礁学会 21 (1) 13 - 23 1345-1421 2019 [Refereed][Not invited]
  
• Reconstruction of anthropogenic 129I temporal variation in the Japan Sea using a coral core sample

  Sakaguchi, A, Inada, R, Sasa, K, Matsunaka, T, Hosoya, S, Takahashi, T, Honda, M, Yamano, H, Sasaki, K, Yamasaki, S, Watanabe, T, Sueki, K

  Marine Environmental Research 142 91 - 99 2018/11 [Refereed][Not invited]
  
• Geochemical and Microstructural Signals in Giant Clam Tridacna maxima Recorded Typhoon Events at Okinotori Island, Japan

  Taro Komagoe, Tsuyoshi Watanabe, Kotaro Shirai, Atsuko Yamazaki, Mitsuo Uematu

  Journal of Geophysical Research: Biogeosciences 123 (5) 1460 - 1474 2169-8961 2018/05/01 [Refereed][Not invited]
   

  To validate the usability of the giant clam shell as a recorder of short-term environmental changes such as typhoons, we collected a live Tridacna maxima from Okinotori Island, Japan, on 15 June 2006. Growth increment thickness, stable isotope ratio (δ18Oshell, δ13Cshell), and the barium/calcium ratio (Ba/Ca) in the T. maxima shell sample were measured and compared to Okinotori Island instrumental environmental data. In the outer layer of the shell sample, there were 365 ± 6 growth increments per year, as estimated by the δ18Oshell profile compared with sea surface temperature. The growth increments in the specimen were formed daily, and thus, we can determine the date of the sampling points of δ18Oshell, δ13Cshell and the Ba/Ca ratio by counting growth increments. After typhoon approach, there is a decrease in increment thickness and some disturbed growth increments. The positive peaks in the shell Ba/Ca ratio and δ18Oshell corresponded to lower sea surface temperature caused by typhoons. These results indicated that the microstructural and geochemical record in Tridacna maxima shells could be useful for detecting past typhoon events.
• Coral sclerochronology: similarities and differences in coral isotopic signatures between mesophotic and shallow-water reefs. In Loya, Y., Puglise, K., and Bridge, T. (Eds.)

  Watanabe, T, Watanabe, T. K, Yamazaki, A, Yoneta, S, Sowa K, Sinniger, F, Eyal, G, Loya, Y, Harii, S

  Coral Reefs of the World Series: Mesophotic Coral Ecosystems 12 2018 [Refereed][Not invited]
  
• Oman coral δ18O seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus

  Watanabe, T.K, Watanabe, T, Yamazaki, A, Pfeiffer, M, Claereboudt, M. R

  Scientific Reports 9, Article number:1887 2045-2322 2018 [Refereed][Not invited]
   

  The Indian Ocean Dipole (IOD) is an interannual mode of climate variability in the Indian Ocean that has intensified with 20th century global-warming. However, instrumental data shows a global-warming hiatus between the late-1990s and 2015. It is presently not clear how the global-warming hiatus affects modes of climate variability such as the IOD, and their basin-wide ocean-atmosphere teleconnections. Here, we present a 26-year long, biweekly record of Sr/Ca and delta O-18 from a Porites coral drilled in the Gulf of Oman. Sea surface temperature (SSTanom) is calculated from Sr/Ca ratios, and seawater delta O-18 (delta O-18(sw-anom)) is estimated by subtracting the temperature component from coral delta O-18. Our delta(18)Osw-anom record reveals a significant regime shift in 1999, towards lower mean delta O-18(sw) values, reflecting intensified upwelling in the western Indian Ocean. Prior to the 1999 regime shift, our SSTanom and delta O-18(sw-anom) show a clear IOD signature, with higher values in the summer of positive-IOD years due to weakened upwelling. The IOD signature in SSTanom and delta O-18(sw-anom) disappears with the overall intensification of upwelling after the 1999 regime shift. The inferred increase in upwelling is likely driven by an intensified Walker circulation during the global-warming hiatus. Upwelling in the Western Indian Ocean uncouples from the IOD.
• Mekong River discharge and the East Asian monsoon recorded by a coral geochemicall record from Con Dao Island, Vietnam

  Phan, T. T, Yamazaki, A, Chiang, H. W, Shen, C. C, Doan, L. M, Watanabe, T

  Geochemial Journal Vol.53(No. 2) (2) e1 - e7 0016-7002 2018 [Refereed][Not invited]
   

  The offshore flow of the Mekong River is strongly governed by the East Asian monsoon (EAM). Monthly-resolved skeletal carbonate Sr/Ca, Ba/Ca and oxygen isotope (delta O-18(c)) data from 1980 to 2005 of a Porites coral from Con Dao Island, similar to 90 km from the Mekong River mouth, were analyzed for capturing the past flood events and the signal of East Asian winter monsoon. Ba/Ca time series is characterized with intra-annual double peaks, the first large one in March during the dry season and relative small one in August during the wet season. The low values of seawater delta O-18 (delta O-18(sw)), deduced from both the Sr/Ca ratio and delta O-18(c), in the wet season resulted from precipitation and/or freshwater input from the Mekong River. The difference in the seasonal characteristics of Ba/Ca and delta O-18(sw) between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.
• Raman spectroscopic determination of Sr/Ca ratios of calcite samples

  Yusuke Shibano, Kohei Takahata, Jun Kawano, Tsuyoshi Watanabe, Daisuke Enomoto, Hiroyuki Kagi, Natsumi Kamiya, Junji Yamamoto

  JOURNAL OF RAMAN SPECTROSCOPY 48 (12) 1755 - 1761 0377-0486 2017/12 [Refereed][Not invited]
   

  We investigated the relation between Sr# [=100Sr/(Sr+Ca) in mol] of calcites and their Raman spectra for Sr-doped calcite samples with Sr# of 0-13.2. We selected 3 major Raman peaks observed at 150-155cm(-1) (peak A), 274-282cm(-1) (peak B), and 710-712.5cm(-1) (peak C). With increasing Sr#, the peaks shifted monotonously to lower wavenumbers. We obtained a linear expression for peak B as Sr#=-1.734(B)+76.93, where (B) is a separation between peak B and a neon emission line of 237.07cm(-1) in Raman shift. The present spectroscopic analysis can ascertain Sr# of calcite with precision of +/- 1.26 in the range of Sr# of 0-13.2.
• Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Roding, 1798)

  O. B. A. Agbaje, R. Wirth, L. F. G. Morales, K. Shirai, M. Kosnik, T. Watanabe, D. E. Jacob

  ROYAL SOCIETY OPEN SCIENCE 4 (9) 2054-5703 2017/09 [Refereed][Not invited]
   

  Tridacna derasa shells show a crossed lamellar microstructure consisting of three hierarchical lamellar structural orders. The mineral part is intimately intergrown with 0.9 wt% organics, namely polysaccharides, glycosylated and unglycosylated proteins and lipids, identified by Fourier transform infrared spectrometry. Transmission electron microscopy shows nanometre-sized grains with irregular grain boundaries and abundant voids. Twinning is observed across all spatial scales and results in a spread of the crystal orientation angles. Electron backscatter diffraction analysis shows a strong fibre texture with the [001] axes of aragonite aligned radially to the shell surface. The aragonitic [100] and [010] axes are oriented randomly around [001]. The random orientation of anisotropic crystallographic directions in this plane reduces anisotropy of the Young's modulus and adds to the optimization of mechanical properties of bivalve shells.
• Reconstruction of the temporal distribution of U-236/U-238 in the Northwest Pacific Ocean using a coral core sample from the Kuroshio Current area

  Tomoya Nomura, Aya Sakaguchi, Peter Steier, Rosmarie Eigl, Akane Yamakawa, Takaaki Watanabe, Keiichi Sasaki, Tsuyoshi Watanabe, Robin Golser, Yoshio Takahashi, Hiroya Yamano

  MARINE CHEMISTRY 190 28 - 34 0304-4203 2017/03 [Refereed][Not invited]
   

  The temporal distribution of U-236 in the Northwest Pacific Ocean was reconstructed through measurements of the annual changes in U-236/U-238 atom ratios in a coral core collected from Kume Island located within the Kuroshio Current region. In total, 74 years (1940-2014) of temporal trend of U-236/U-238 atom ratios were reconstructed using Accelerator Mass Spectrometry (AMS). The annually resolved U-236/U-238 ratios showed a strong increase from 1952, and two prominent peaks were found in the annual bands for 1954 (11.0 +/- 1.2 x 10(-9)) and 1958 (8.55 +/- 1.17 x 10(-9)); also an enhanced peak was observed for the band of 1963 (3.51 +/- 0.20 x 10(-9)). These peaks coincided with the occurrence of large nuclear tests in the Pacific Proving Grounds and/or the highest global fallout rate, suggesting a clear influence of these nuclear events on U-236/U-238 atom ratios. Furthermore, the coral results showed some disagreement with the annual changes for U-236 in East Asian corals collected at the entrance to the Sea of Japan. Based on these results, the mixing ratios of the surface seawater currents in the Northwest Pacific Ocean have been estimated. (C) 2017 Elsevier B.V. All rights reserved.
• Seasonal SST variability during Mid-Holocene deduced from coupled coral Sr/Ca and oxygen isotope records from Kikai Island, Japan

  Lariosa Garas Kevin, Watanabe Tsuyoshi, Yamazaki Atsuko

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 64 97 - 97 2017 

  [INTRODUCTION] The Holocene is characterized by shifting climate regime from Holocene Thermal Maximum (HTM) (7.0 kyr – 5.0 kyr), post-HTM cool period (4.6 kyr-4.0 kyr) to Late Holocene gradual warming period. Accurate timing and influence of climate regime shift to East Asian Monsoon (EAM) during Holocene in Northwestern Pacific have yet to be fully understood. [MATERIALS AND METHODS] We reconstructed sea surface temperature (SST) using coupled Sr/Ca and δ18O records of two fossil corals with 14C age dates of 5.7 kyr and 3.2 kyr BP, collected from uplifted reef terraces in Kikai Island, Japan. With biweekly to monthly resolution, powder samples were collected along the maximum vertical growth axis from well-preserved coral skeleton. 80-100 µg powder samples were analyzed to measure Sr/Ca ratio using Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and 20-40 µg powder samples were analyzed to measure δ18O ratio using Isotope Ratio Mass Spectrometer (MAT 253) coupled with Kiel IV carbonate device.[RESULTS AND DISCUSSION] Fossil corals recorded cooler mean SST during 5.7 kyr BP (24.5 °C) and 3.2 kyr BP (24.1 °C) compared to the modern coral SST record (25.4 °C). Average maximum (summer) and minimum (winter) SSTs during 5.7 kyr BP were 28.0°C and 18.6°C, respectively. Average maximum and minimum SSTs during 3.2 kyr BP were 27.7°C and 19.9°C, respectively. Enhanced winter-summer seasonality during 5.7 kyr (9.5°C) while reduced seasonality during 3.2 kyr (7.8°C) were detected from the Sr/Ca time series relative to average seasonality measured from modern coral record (8.1°C). The 5.7 kyr BP coral record shows average summer SST almost similar with previously reconstructed SST from Kikai Island during Holocene Thermal Maximum (Morimoto et.al. 2007 (7.0 kyr and 6.1 kyr); Kajita et.al. 2017 (4.9 kyr)). However, winter during 5.7 kyr was colder by ~2.0°C relative to other HTM records from Kikai Island. This suggests a cooler environment during 5.7 kyr that occurred in the middle of HTM in Northwestern Pacific. The 3.2 kyr BP coral record has higher SST values compared to the reported SSTs from 3.4 to 4.2 kyr in Kikai Island (Abram et.al. 2001). This shows the end-timing of cooling event in Northwestern Pacific around 3.2 kyr BP then shifted to gradual warming period in Late Holocene. The reconstructed SST during 5.7 kyr recorded the largest seasonality within the HTM compared to the previously published data from Kikai Island. This revealed a stronger EAM despite relatively cooler SST to other HTM SST records in Kikai Island. The 3.2 kyr recorded a reduced seasonality driven by weaker EAM. Coral δ18O records from 3.4 to 4.2 kyr in Kikai Island also show weaker EAM. In this presentation, we also present the coral δ18O records during 5.7 kyr and 3.2 kyr BP to discuss the mechanism of EAM influence to the hydroclimatology in Kikai Island during Mid-Holocene.

• Growth history and temperature variation recorded in Porites coral skeletons from Mesophotic zone in Sesoko Island, Okinawa

  Yoneta Shiori, Yamazaki Atuko, K. Watanabe Takaaki, Sinniger Frederic, Harii Saki, Watanabe Tsuyoshi

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 64 98 - 98 2017 

• Nitrogen isotope proxy for reef coral skeletons toward unlocking nutrient dynamics in low latitude oceans

  Yamazaki Atsuko, Watanabe Tsuyoshi

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 64 11 - 11 2017 

• Past summer upwelling events in the Gulf of Oman derived from a coral geochemical record

  Watanabe, T.K, Watanabe, T, Yamazaki, A, Pfeiffer, M, Garbe-Schönberg, D, Claereboudt, M. R

  Scientific Reports 7 2045-2322 2017 [Refereed][Not invited]
   

  We used a high-resolution oxygen isotope (delta O-18(coral)), carbon isotope (delta O-18(coral)) and Sr/Ca ratios measured in the skeleton of a reef-building coral, Porites sp., to reveal seasonal-scale upwelling events and their interannual variability in the Gulf of Oman. Our delta C-13(coral) record shows sharp negative excursions in the summer, which correlate with known upwelling events. Using delta C-13(coral) anomalies as a proxy for upwelling, we found 17 summer upwelling events occurred in the last 26 years. These anomalous negative excursions of delta C-13(coral) result from upwelled water depleted in C-13 (dissolved inorganic carbon) and decreased water-column transparency. We reconstructed biweekly SSTs from coral Sr/Ca ratios and the oxygen isotopic composition of seawater (delta O-18(SW)) by subtracting the reconstructed Sr/Ca-SST from delta O-18(coral). Significant delta O-18(SW) anomalies occur during major upwelling events. Our results suggest delta C-13(coral) anomalies can be used as a proxy for seasonal upwelling intensity in the Gulf of Oman, which, driven by the Indian/Arabian Summer Monsoon, is subject to interannual variability.
• Holocene sea surface temperature variations recorded in corals from Kikai Island, Japan

  Kajita, Hiroto, Yamazaki, Atsuko, Watanabe, Takaaki, Wu, Chung-Che, Shen, Chuan-Chou, Watanabe, Tsuyoshi

  GEOCHEMICAL JOURNAL 51 (4) E9 - E14 0016-7002 2017 [Refereed][Not invited]
   

  Understanding seasonal to interannual characteristics of the climate during the transition from the "Holocene Optimum" (7.0-5.0 kyr BP) to mid-Holocene cold and dry period (4.6-4.0 kyr BP) is important since it is related to the evolution and collapse of human civilization in East Asia. To investigate those characteristics, we reconstructed a seasonal scale sea surface temperature (SST) and measured oxygen isotope ratios (delta O-18) in seawater (delta O-18(seawater)) using modern and fossil (4.9 kyr) corals from Kikai Island. Larger seasonal amplitudes observed among the reconstructed SST values and delta O-18(seawater) change at 4.9 kyr suggest that the East Asian Monsoon (EAM) circulation might be stronger than the present-day. Our compiled coral records, along with the previous studies from Kikai Island, also suggest that the largest SST amplitude during the Holocene Optimum was recorded at 4.9 kyr and an abrupt cold climate shift occurred during the Holocene Optimum and the Pulleniatina Minimum Event (PME) in the north-western Pacific.
• Post-bomb coral Delta C-14 record from Iki Island, Japan: possible evidence of oceanographic conditions on the northern East China Sea shelf

  Takehiro Mitsuguchi, Masashi Hirota, Atsuko Yamazaki, Tsuyoshi Watanabe, Hiroya Yamano

  GEO-MARINE LETTERS 36 (5) 371 - 377 0276-0460 2016/10 [Refereed][Not invited]
   

  In this study, a sea-surface water Delta C-14 record of AD 1966-2000 (i.e., after the atmospheric nuclear-bomb testing period of the mid-1950s to early 1960s) was reconstructed from a coral sample collected from Iki Island, western Japan. The island is located in the Tsushima Strait where the Tsushima Current flows from the East China Sea (ECS) continental shelf into the Sea of Japan, indicating a strong influence of the ECS shelf water on the island. It is widely accepted that the Tsushima Current originates in the area between the ECS shelf break and the Nansei Islands further offshore as a branch of the Kuroshio Current, although another possible origin is the Taiwan-Tsushima Current System. The Delta C-14 record from Iki Island shows the following evidence of a response to the atmospheric nuclear testing: (1) an increase from similar to 55aEuro degrees in 1966 to similar to 133aEuro degrees in 1970, (2) a plateau ranging between similar to 123 and similar to 142aEuro degrees during the 1970s to the late 1980s, and (3) a gradual decrease from similar to 115aEuro degrees in 1990 to similar to 83aEuro degrees in 2000. Comparison of this record with coral Delta C-14 records from the Nansei Islands (Okinawa Island, Ishigaki Island and Kikai Island), located similar to 160-280 km off the ECS shelf break and little influenced by the shelf water, suggests that the surface-water Delta C-14 around Iki Island was similar to 30-45aEuro degrees lower than that of the Nansei Islands from the mid-1960s to late 1970s, and that the Delta C-14 difference between Iki Island and the Nansei Islands decreased from the end of the 1970s to similar to 0-15aEuro degrees in the mid-1980s to 2000. The lower Delta C-14 around Iki Island can be explained as follows: (1) in contrast to the Nansei Islands area, the ECS shelf area is a vertically mixed, highly concentrated carbon reservoir significantly connected to subsurface and deeper waters outside the shelf area, strongly suggesting that the surface-water Delta C-14 of the shelf area (perhaps excepting very shallow innermost shelf areas) was significantly less sensitive to the atmospheric nuclear-bomb C-14 spike than that of the Nansei Islands area; (2) the shelf-surface water is conveyed from the northern ECS to Iki Island by the Tsushima Current. Thus, it can be suggested that the post-bomb coral Delta C-14 record from Iki Island reflects oceanographic conditions of the northern ECS shelf.
• A 150-year variation of the Kuroshio transport inferred from coral nitrogen isotope signature

  Atsuko Yamazaki, Tsuyoshi Watanabe, Urumu Tsunogai, Fumihito Iwase, Hiroya Yamano

  PALEOCEANOGRAPHY 31 (6) 838 - 846 0883-8305 2016/06 [Refereed][Not invited]
   

  The Kuroshio Current is a major global ocean current that drives the physical ocean-atmosphere system with heat transport from tropical to temperate zones in the North Pacific Ocean. We reconstructed the variability of the Kuroshio transport over the past 150years using coral skeletal nitrogen isotopic composition (N-15(coral)). A 150year N-15(coral) record (1859-2008 A.D.) is 4 times the length of the observational record (1971 to present) and could provide a direct comparison with global climate change, such as the Pacific Decadal Oscillation (PDO) index and El-Nino-Southern Oscillation (ENSO), through recent global warming. Coral cores from Porites were collected from Tatsukushi Bay in 2008 on the Pacific coast of Japan, which is located on the northern front of the Kuroshio Current. N-15(coral) was used as a proxy to record the N-15 of nitrate (N-15(nitrate)) controlled by the upwelling of subtropical subsurface water (N-15(nitrate); similar to+2-+3), and N-15(coral) was negatively correlated with observations of the Kuroshio transport (R=-0.69, P<0.001) and the 2year lagged PDO index (R=-0.63, P<0.005) from 1972 to 2007. The 150year record of N-15(coral) suggested that the Kuroshio transport varied with similar to 25year cycle, and the amplitude became more stable, and the volume was intensified through the twentieth century. The Kuroshio transport was intensified by the La Nina state in the early 1900s and by the El Nino-PDO state after the 1920s. Our results suggested that the Kuroshio transport was influenced by the combined climate modes of ENSO and PDO during the last century.
• Precipitation of halite during calcification of the massive reef-building coral Porites lobata

  Satoko Motai, Jun Kawano, Takaya Nagai, Kohki Sowa, Tsuyoshi Watanabe

  EUROPEAN JOURNAL OF MINERALOGY 28 (2) 265 - 271 0935-1221 2016/03 [Refereed][Not invited]
   

  Detailed observations of mineral phases in the skeleton of a massive reef-building coral were performed at nano- to micrometer scales using an analytical transmission electron microscope. The most notable result is the discovery of a nanosized halite (NaCl) phase coexisting with aragonite (CaCO3) in the coral skeleton. The halite grains are scattered not only along grain boundaries but also inside aragonite grains. The specific relationship of crystallographic orientations and microstructural features between halite and surrounding aragonite suggest that halite precipitated simultaneously with aragonite during calcification. The primary deposition of a mineral phase other than aragonite in a coral skeleton is confirmed for the first time.
• Spatial distribution and 50 years records of Mn and Fe at the coral reef in Ishigaki Island, Japan

  Inoue Mayuri, Ishikawa Daisaku, Miyaji Tsuzumi, Yamazaki Atsuko, Suzuki Atsushi, Yamano Hiroya, Kawahata Hodaka, Watanabe Tsuyoshi

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 63 190 - 190 2016 

• Temporal and vertical distributions of anthropogenic U-236 in the Japan Sea using a coral core and seawater samples

  Aya Sakaguchi, Tomoya Nomura, Peter Steier, Robin Gloser, Keiichi Sasaki, Tsuyoshi Watanabe, Tomoeki Nakakuki, Yoshio Takahashi, Hiroya Yamano

  JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121 (1) 4 - 13 2169-9275 2016/01 [Refereed][Not invited]
   

  The input history of U-236 to the surface water of the Japan Sea was reconstructed through measurement of the U-236/U-238 atom ratio in annual bands of a coral skeleton which was collected at Iki Island in the Tsushima Strait, the main entrance to the Japan Sea. The U-236/U-238 atom ratios and concentrations of U isotopes were measured for the period 1935-2010 using AMS and ICP-MS. The U-236/U-238 atom ratios revealed three prominent peaks: 4.51 x 10(-9) in 1955, 6.15 x 10(-9) in 1959 and 4.14 x 10(-9) in 1963; thereafter the isotope ratios gradually decreased over the next several decades, attaining a value of ca.1.3 x 10(-9) for the present day. A simplified depth profile model for U-236 in the Japan Sea, using the reconstructed U-236 value for the surface water together with observed depth profiles for U-236 in the water column in 2010, yielded diffusion coefficients of 3.4-5.6 cm(2)/s for 6 sampling points. The diffusion coefficient values obtained for the northern stations were relatively large, and fitting uncertainty was also larger for stations in the northern region. It may be presumed that the distribution of U-236 in the water columns have been influenced not only by diffusion but also by subduction of the surface water in the Japan Sea.
• Coupling Remote Sensing and Coral Annual Band Data to Investigate the History of Catchment Land Use and Coral Reef Status

  Yamano, H, Watanabe, T

  Coral Reef Science 2016 [Refereed][Not invited]
  
• Response of Acropora digitifera to ocean acidification: constraints from delta B-11, Sr, Mg, and Ba compositions of aragonitic skeletons cultured under variable seawater pH

  Kentaro Tanaka, Michael Holcomb, Asami Takahashi, Haruko Kurihara, Ryuji Asami, Ryuichi Shinjo, Kohki Sowa, Kai Rankenburg, Tsuyoshi Watanabe, Malcolm McCulloch

  CORAL REEFS 34 (4) 1139 - 1149 0722-4028 2015/12 [Refereed][Not invited]
   

  The response of Acropora digitifera to ocean acidification is determined using geochemical proxy measurements of the skeletal composition of A. digitifera cultured under a range of pH levels. We show that the chemical composition (delta B-11, Sr/Ca, Mg/Ca, and Ba/Ca) of the coral skeletons can provide quantitative constraints on the effects of seawater pH on the pH in the calcification fluid (pH(CF)) and the mechanisms controlling the incorporation of trace elements into coral aragonite. With the decline of seawater pH, the skeletal delta B-11 value decreased, while the Sr/Ca ratio showed an increasing trend. The relationship between Mg/Ca and Ba/Ca versus seawater pH was not significant. Inter-colony variation of delta B-11 was insignificant, although inter-colony variation was observed for Ba/Ca. The decreasing trend of pH(CF) calculated from delta B-11 was from similar to 8.5, 8.4, and 8.3 for seawater pH of similar to 8.1, 7.8, and 7.4, respectively. Model calculations based on Sr/Ca and pH(CF) suggest that upregulation of pH(CF) occurs via exchange of H+ with Ca2+ with kinetic effects (Rayleigh fractionation), reducing Sr/Ca relative to inorganic deposition of aragonite from seawater. We show that it is possible to constrain the overall carbonate chemistry of the calcifying fluid with estimates of the carbonate saturation of the calcifying fluid (Omega (CF)) being derived from skeletal Sr/Ca and pH(CF) (from delta B-11). These estimates suggest that the aragonite saturation state of the calcifying fluid Omega (CF) is elevated by a factor of 5-10 relative to ambient seawater under all treatment conditions.
• Middle Holocene daily light cycle reconstructed from the strontium/calcium ratios of a fossil giant clam shell

  Masako Hori, Yuji Sano, Akizumi Ishida, Naoto Takahata, Kotaro Shirai, Tsuyoshi Watanabe

  SCIENTIFIC REPORTS 5 2045-2322 2015/03 [Refereed][Not invited]
   

  Insolation is an important component of meteorological data because solar energy is the primary and direct driver of weather and climate. Previous analyses of cultivated giant clam shells revealed diurnal variation in the Sr/Ca ratio, which might reflect the influence of the daily light cycle. We applied proxy method to sample from prehistoric era, a fossil giant clam shell collected at Ishigaki Island in southern Japan. The specimen was alive during the middle Holocene and thus exposed to the warmest climate after the last glacial period. This bivalve species is known to form a growth line each day, as confirmed by the analysis of the Sr enrichment bands using EPMA and facilitated age-model. We analyzed the Sr/Ca, Mg/Ca and Ba/Ca ratios along the growth axis, measuring a 2-mmspot size at 2-mminterval using NanoSIMS. The Sr/Ca ratios in the winter layers are characterized by a striking diurnal cycle consisting of narrow growth lines with high Sr/Ca ratios and broad growth bands with low Sr/Ca ratios. These variations, which are consistent with those of the cultivated clam shell, indicate the potential for the reconstruction of the variation in solar insolation during the middle Holocene at a multi-hourly resolution.
• The coral delta N-15 record of terrestrial nitrate loading varies with river catchment land use

  A. Yamazaki, T. Watanabe, U. Tsunogai, H. Hasegawa, H. Yamano

  CORAL REEFS 34 (1) 353 - 362 0722-4028 2015/03 [Refereed][Not invited]
   

  We analysed the nitrogen isotopes in two coral cores (delta N-15(coral)) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the delta N-15(coral) reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in delta N-15(coral) for 14 years (CORE1; 1993-2007) and the annual variation of delta N-15(coral) for 52 years (CORE2; 1958-2010). In CORE1, the 5-month running mean of delta N-15(coral) was positively correlated with that of monthly precipitation, excluding all strong precipitation events (> 150 mm d(-1)). In CORE2, the delta N-15(coral) mean in the earlier period (1958-1980) was 1.0 aEuro degrees greater than that in the later period (1981-2010). The annual averages of delta N-15(coral) are positively correlated with the total precipitation in the rainy season (May-June) for both time periods. The difference in the delta N-15(coral) between the earlier and later periods is probably caused by the land use changed from paddy fields with N-15-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of delta N-15 coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.
• δ11B, Sr, Mg and Ba in Acropora digitifera cultured under acidified seawater: Effects of seawater pH on trace element incorporation into coral aragonite

  Tanaka, K, Holcomb M, Takahashi, A, Kurihara, H, Asami, R, Shinjo, R, Sowa, K, Rankenburg, K, Watanabe, T, McCulloch, M

  Coral Reefs 2015 [Refereed][Not invited]
  
• 北海道伊達市カムイタプコプ下遺跡から復元されたアイヌ文化期の古環境 II―調査速報―

  Yuji Soeda, Nobuhiro Kanno, Tomoya Aono, Yukihito Nagaya, Atsushi Kawahata, Motoshige Date, Tomohiro Mitani, Kentaro Nakamura, Kosuke Matsuda, Hisako Uenaka, Tsuzumi Miyaji, Takeshi Watanabe, Ayako Shibutani

  31st Annual Meeting of the Japan Society for Scientific Studies on Cultural Property Abstracts 30 - 31 2014/07 [Refereed][Not invited]
  
• Evaluation of Mn and Fe in coral skeletons (Porites spp.) as proxies for sediment loading and reconstruction of 50 yrs of land use on Ishigaki Island, Japan

  Mayuri Inoue, Daisaku Ishikawa, Tsuzumi Miyaji, Atsuko Yamazaki, Atsushi Suzuki, Hiroya Yamano, Hodaka Kawahata, Tsuyoshi Watanabe

  CORAL REEFS 33 (2) 363 - 373 0722-4028 2014/06 [Refereed][Not invited]
   

  Manganese (Mn) and iron (Fe) concentrations were measured in coral skeletons (Porites spp.) collected from the Todoroki River on Ishigaki Island, Japan, to reconstruct the history of land use in the river catchment area. We prepared (1) five bulk samples to investigate the present spatial distribution and (2) micro-samples from two long cores to study the temporal variability of sediment loading from the Todoroki River. The existing state of the elements Mn and Fe in bulk coral skeleton samples was examined by a chemical cleaning experiment. The results of the experiment suggested that Fe was not incorporated into the crystal lattice of the coral skeleton but that Mn was incorporated, as previously reported. The bulk sample data, with and without chemical cleaning, indicated that the spatial distribution of both elements in corals collected along a sampling line from the river mouth toward the reef crest was complex and most likely reflected salinity changes and the amount of suspended particulate matter. The temporal variation of Mn and Fe, in particular the variation of baseline/background levels, mainly reflected the history of land development on Ishigaki Island. In addition, Mn showed clear seasonal variability that appeared to be controlled by a combination of temperature, primary productivity, and precipitation. The results of the present study suggest that Mn may be a useful proxy for river discharge or biological activity depending on local marine conditions, if the specific behavior of Mn at the coral growth site is known.
• A 106 year monthly coral record reveals that the East Asian summer monsoon modulates winter PDO variability

  Tsuyoshi Watanabe, Takashi Kawamura, Atsuko Yamazaki, Masafumi Murayama, Hiroya Yamano

  GEOPHYSICAL RESEARCH LETTERS 41 (10) 3609 - 3614 0094-8276 2014/05 [Refereed][Not invited]
   

  The Pacific Decadal Oscillation (PDO) is a dominant climate mode in the Pacific Ocean and thought to be related to seasonal to decadal changes in sea surface conditions. Colonies of long-living Porites coral, widely used to reconstruct monthly to century-scale tropical sea surface temperature and sea surface salinity records, were discovered near Koshiki Island, Japan (31 degrees N, 129 degrees E). A monthly resolved, 106 year 18O record revealed that distinct decadal-scale variability was significantly correlated with the PDO index. Our comparison showed 1 to 3 years lead-lag correlation of summer coral 18O with the winter PDO index, suggesting that the East Asian summer monsoon (EASM) may act as the driving force of winter PDO variability over the last 100 years. Cross-spectral analysis between the winter PDO index and summer coral 18O suggested that recent and future global warming may lead to a more frequent and/or stronger teleconnection between EASM and PDO.
• Lead concentration and isotopic composition in the Pacific sclerosponge (Acanthochaetetes wellsi) reflects environmental lead pollution

  Kazuto Ohmori, Tsuyoshi Watanabe, Masaharu Tanimizu, Kotaro Shirai

  GEOLOGY 42 (4) 287 - 290 0091-7613 2014/04 [Refereed][Not invited]
   

  We measured Pb/Ca and Pb isotopes with high resolution in the high-Mg calcite skeleton of a Pacific sclerosponge (Acanthochaetetes wellsi) collected from the reef edge off the western coast of Kume Island (East China Sea), to investigate its potential to he used as a proxy for lead contamination in the environment, and atmospheric transportation and fallout over the last few decades. Skeletal Pb/Ca ranged from 58 to 1642 nmol/mol, 10x higher than that of the aragonite skeleton of Pacific corals, and 2.5x higher than that of the aragonite skeletons of Caribbean sclerosponges. The Pb/Ca timeseries recorded from 1967 through 2007 CE correspond to historical changes in atmospheric lead flux in anthropogenic aerosols. Pb isotopes (Pb-206/Pb-207 and Pb-208/Pb-207) in the sclerosponge skeleton document that the main source of lead emissions shifted from Japan (1970-1980 CE) to China (1995-2005 CE), as expected from the timing of legislation against the use of leaded gasoline in Japan and China. Our results indicate that the skeleton of the Pacific sclerosponge is a powerful proxy to monitor environmental lead pollution. Applying this methodology to long-living and/or fossil specimens could be useful in determining the interannual variability of atmospheric transport and dynamics over geologic time scales.
• Influence of Land Development on Holocene Porites Coral Calcification at Nagura Bay, Ishigaki Island, Japan

  Kohki Sowa, Tsuyoshi Watanabe, Hironobu Kan, Hiroya Yamano

  PLOS ONE 9 (2) e88790  1932-6203 2014/02 [Refereed][Not invited]
   

  To evaluate the relationships between coral calcification, thermal stress, and sedimentation and eutrophication linked to human impact (hereafter referred to as "land development") by river discharge, we analyzed growth characteristics in the context of a paleoenvironment that was reconstructed from geochemical signals in modern and fossil (1.2 cal kyr BP and 3.5 cal kyr BP, respectively) massive Porites corals from Nagura Bay ("Nagura") and from modern Porites corals from the estuary of the Todoroki River, Shiraho Reef ("Todoroki"). Both sites are on Ishigaki Island, Japan, and Nagura is located approximately 12 km west of Todoroki. At Nagura, the individual corals provide time windows of 13 (modern), 10 (1.2 cal kyr BP), and 38 yr in length (3.5 cal kyr BP). Here, we present the coral annual calcification for Nagura and Todoroki, and (bi) monthly resolved records of Sr/Ca (a proxy of sea surface temperature (SST)) and Ba/Ca (a proxy of sedimentation and nutrients related to land development) for Nagura. At Nagura, the winter SST was cooler by 2.8 degrees C in the 1.2 cal kyr BP, and the annual and winter SSTs in the 3.5 cal kyr BP were cooler by 2.6 degrees C and 4.6 degrees C, respectively. The annual periodicity of Ba/Ca in modern coral is linked to river discharge and is associated with land development including sugar cane cultivation. Modern coral calcification also has declined with SST warming and increasing Ba/Ca peaks in winter. However, calcification of fossil corals does not appear to have been influenced by variations in Sr/Ca and Ba/Ca. Modern coral growth characteristics at Nagura and Todoroki indicate that coral growth is both spatially and temporally influenced by river discharge and land development. At Nagura, our findings suggest that land development induces negative thermal sensitivity for calcification in winter due to sugar cane harvest, which is a specifically modern phenomenon.
• Reconstruction of supply history of U-236 to Japan Sea using Iki coral

  Nomura Tomoya, Sakaguchi Aya, Steier Peter, Watanabe Takaaki, Watanabe Tsuyoshi, Takahashi Yoshio, Yamano Hiroya

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 61 73 - 73 2014 

  本研究では、最終的に日本海における深層水の形成メカニズムや循環を詳細に明らかにすべく、そのトレーサーとして利用する人工放射性核種U-236の日本海表層へ供給変遷史を明らかにすることを目的とし、対馬海峡にある壱岐島で採取したサンゴコア試料の各年輪中U同位体分析を行った。結果、サンゴ試料から1935-2010年の間のU-236/U-238比を復元することができた。復元されたU-236/U-238比は、1955年、1959年、1963年の3つのピークを示した。大気圏内核実験による核出力が最大であった1963年にはピークは見られたものの最大値を示さなかった。U-236/U-238比の最大は、赤道太平洋核実験場で最も多く核実験が行われた1958年の一年後である1959年であった。このことから日本海へのU-236供給は、グローバルフォールアウトによる1960年代の導入以前に、北赤道核実験場で行われた水爆実験の影響を受けた海水が既に流入しており、その影響は相対的に大きいことが分かった。
• Reconstruction of hydrothermal events using reef building corals in Satsuma Iwo-jima

  Watanabe Tsuyoshi

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 61 284 - 284 2014 

  Coral cores from massive corals could record marine environmental and ecological changes in their annual bands with monthly temporal resolution in the present and/or the past. We discovered large massive Porites corals living at active volcanic island of Satsuma Io-Jima, located 50 km south from Kyushu area, southern part of Japan. Satsuma Io-Jima provides a unique opportunity to observe marine organism living under extreme environments of volcanic gases emission and different types of hydrothermal activities from sea flower. We collected eleven coral cores from four different conditions around the island to test if corals could record volcanic and hydrothermal activities and how corals could survive in extreme environments such as very low pH condition with CO2 emission. Coral extension rate for the site near hydrothermal vent was significantly small (1-2mm/year) relative to that for general condition of Porites corals (ca. 10-20 mm/year), suggesting that coral growth was influenced by hydrothermal activity. We will demonstrate our preliminary results of geochemical approaches of δ18O, δ1３C, Sr/Ca, Mg/Ca, Ba/Ca, and F/Ca in coral skeletons and in surrounding seawater and discuss the possibility for reconstructing the past hydrothermal events and relationship between marine ecosystem and extreme environments at volcanic activity as the analogues for coral adaptation to future ocean acidification.
• High-resolution isotopic records in Oman corals: Indian Monsoon climate reconstruction

  Watanabe Takaaki, Watanabe Tsuyoshi, Yamazaki Atsuko, Pfeiffer Miriam, Garbe Schonberg Dieter, R Claereboudt Michel

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 61 187 - 187 2014 

  In this research we reconstructed seasonal changes of ITCZ by using Porites.sp from Gulf of Oman. We analyzed Sr/Ca ratio , oxygen isotope records and carbon isotope records. We estimated oxygen isotope records in seawater from coral records.Sr/Ca ratio captured sea surface temperature in Gulf of Oman. Oxygen isotope records in seawater from coral records captured seasonal salinity variation. Carbon isotope records reconstructed phytoplankton bloom.
• Nitrogen isotopes in intra-crystal coralline aragonites

  Atsuko Yamazaki, Tsuyoshi Watanabe, Naoto Takahata, Yuji Sano, Urumu Tsunogai

  CHEMICAL GEOLOGY 351 276 - 280 0009-2541 2013/08 [Refereed][Not invited]
   

  To assess the preservation of the nitrogen isotope composition in reef corals, nitrogen isotopes in a well-preserved Pliocene fossil coral (located in the Tartaro formation on Luzon Island, Philippines (14 degrees N, 121 degrees E)) and in a modern coral (Kochi, Japan (32 degrees N, 132 degrees E)) were analysed using stepwise heating methods. The thermal decomposition of aragonite triggered the largest release of nitrogen at 700 degrees C for the modern coral and 550 degrees C for the Pliocene coral. The highest rate of nitrogen gas emission occurred at the aragonite collapse temperature, indicating that organic nitrogen was bound within the intra-crystals of coralline aragonites in both corals. After the aragonite collapsed in both corals, the nitrogen isotope ratios increased due to fractionation and then decreased to values similar to those observed in bulk samples of the modern (+10.1%) and Pliocene (+4.4%) corals. These results suggested that fresh organic nitrogen was released due to the decomposition of the internal skeletal structure at higher temperatures (900-1000 degrees C). Nitrogen isotopes in coral skeletons were preserved in intra-crystal aragonite, even in a Pliocene fossil, and stepwise heating methods were shown to be useful for determining the preservation of coralline nitrogen isotopes. (c) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
• A skeletal Sr/Ca record preserved in Dipsastraea (Favia) speciosa and implications for coral Sr/Ca thermometry in mid-latitude regions

  Inah Seo, Yong Il Lee, Tsuyoshi Watanabe, Hiroya Yamano, Michiyo Shimamura, Chan Min Yoo, Kiseong Hyeong

  GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 14 (8) 2873 - 2885 1525-2027 2013/08 [Refereed][Not invited]
   

  A core (900 mm long) of the scleractinian coral Dipsastraea (Favia) speciosa was collected from Iki Island (approximate to 33 degrees 48N), Japan, one of the highest latitude coral reefs known to exist at present, where winter monthly mean sea surface temperature (SST) drops to 13 degrees C. The Sr/Ca profile was constructed using a bulk sampling method for the uppermost 280 mm interval of the core, which grew between 1966 and 2007, to test whether it could act as a suitable proxy for SST in a harsh environmental setting where reef-building coral do not usually survive. The Sr/Ca-SST relationship derived from the annual Sr/Ca and SST extremes predicted the observed monthly averaged summer SST extremes within an error range of 1.1 degrees C (1 s.d., n=40). The obtained Sr/Ca-SST calibration was also found to be valid for subtropical Dipsastraea (Favia) corals, proving its broad applicability. However, low-amplitude winter peaks were observed in the slow-growing intervals, which we confirmed (using individual spot analysis along a continuous growth line) result from the mixing of theca grown at different times. Our bulk sampling approach, across multiple growth lines in the skeleton of D. (F.) speciosa, led to the mixing of asynchronous skeletal part. At the study site, D. (F.) speciosa grows continuously, even during the cold season, suggesting that the skeletal Sr/Ca obtained from specimens of D. (F.) speciosa can be used as an SST proxy in the northwest Pacific marginal seas.
• Skeletal growth of Dipsastraea speciosa (Dana, 1846) from the subtropical and temperate regions in Japan

  Nagata, S, Sugihara, K, Irino, T, Watanabe, T, Hiroya Yamano, H

  Journal of the Japanese Coral Reef Society 日本サンゴ礁学会 15 37 - 56 1345-1421 2013 [Refereed][Not invited]
  
• Needle-like grains across growth lines in the coral skeleton of Porites lobata.

  Satoko Motai, Takaya Nagai, Kohki Sowa, Tsuyoshi Watanabe, Naoya Sakamoto, Hisayoshi Yurimoto, Jun Kawano

  Journal of structural biology 180 (3) 389 - 93 1047-8477 2012/12 [Refereed][Not invited]
   

  The skeletal texture and crystal morphology of the massive reef-building coral Porites lobata were observed from the nano- to micrometer scale using an analytical transmission electron microscope (ATEM). The skeletal texture consists of centers of calcification (COCs) and fiber area. Fiber areas contain bundles of needle-like aragonite crystals that are elongated along the crystallographic c-axis and are several hundred nanometers to one micrometer in width and several micrometers in length. The size distribution of aragonite crystals is relatively homogeneous in the fibers. Growth lines are observed sub-perpendicular to the direction of aragonite growth. These growth lines occur in 1-2 μm intervals and reflect a periodic contrast in the thickness of an ion-spattered sample and pass through the interior of some aragonite crystals. These observations suggest that the medium filled in the calcification space maintains a CaCO₃-supersaturated state during fiber growth and that a physical change occurs periodically during the aragonite crystals of the fiber area.
• Visualization of sub-daily skeletal growth patterns in massive Porites corals grown in Sr-enriched seawater

  Kotaro Shirai, Kohki Sowa, Tsuyoshi Watanabe, Yuji Sano, Takashi Nakamura, Peta Clode

  JOURNAL OF STRUCTURAL BIOLOGY 180 (1) 47 - 56 1047-8477 2012/10 [Refereed][Not invited]
   

  We performed high resolution marking experiments using seawater with elevated Sr concentration to investigate the timing and ultrastructure of skeletal deposition by massive Porites australiensis corals. Corals were cultured in seawater enriched with Sr during day-time only, night-time only or for one full-day. Cross sections of skeletal material were prepared and the Sr incorporated into the newly deposited skeleton analyzed by electron probe microanalysis. These regions of Sr incorporation were then correlated with skeletal ultrastructure. Massive Pontes coral skeletons are composed of two types of microstructural elements - the "centers of calcification" and the surrounding fibrous structural region. Within the fibrous structural region, alternative patterns of etch-sensitive growth lines and an etch-resistant fibrous layer were observed. In the full-day samples, high-Sr bands extended across both growth lines and fibrous layers. In day-time samples, high-Sr regions corresponded to the fibrous layer, while in the night-time samples high-Sr regions were associated with an outermost growth line. These distinct growth patterns suggest a daily growth pattern associated with the fibrous region of massive P. australiensis corals, where a pair of narrow growth lines and a larger fibrous layer is seen as a daily growth region. (C) 2012 Elsevier Inc. All rights reserved.
• Coral reefs at 34 degrees N, Japan: Exploring the end of environmental gradients

  Hiroya Yamano, Kaoru Sugihara, Tsuyoshi Watanabe, Michiyo Shimamura, Kiseong Hyeong

  GEOLOGY 40 (9) 835 - 838 0091-7613 2012/09 [Refereed][Not invited]
   

  We describe the architecture and development of the highest latitude coral reefs currently known on Earth, located in Japan at 34 degrees N. The reefs are distributed within turbid inner bays and undergo winter sea-surface temperatures (SSTs) that fall to 13 degrees C, well below the generally accepted lower limit (18 degrees C in winter) of tropical coral reef formation. Despite low SSTs and high turbidity, coring indicates reefs ranging to 555 cm in thickness since ca. 4.3 k.y. ago. The reefs exhibit high adaptability to this extremely marginal environment. Variability of the Tsushima Warm Current and the Asian monsoon could have affected the evolution of these reefs. The corals are dominantly faviids, in contrast to Acropora and Porites that tend to dominate low-latitude, tropical-subtropical reefs. Defining the end of the distributional range, the reefs serve as baselines for understanding coral reef distribution along SST and turbidity gradients.
• Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

  Yuji Sano, Sayumi Kobayashi, Kotaro Shirai, Naoto Takahata, Katsumi Matsumoto, Tsuyoshi Watanabe, Kohki Sowa, Kenji Iwai

  NATURE COMMUNICATIONS 3 doi: 10.1038/ncommc1763頁  2041-1723 2012/03 [Refereed][Not invited]
   

  The historical record of daily light cycle in tropical and subtropical regions is short. Moreover, it remains difficult to extract this cycle in the past from natural archives such as biogenic marine carbonates. Here we describe the precise analysis of Sr/Ca, Mg/Ca, and Ba/Ca ratios in a cultivated giant clam shell, using a laterally high-resolution secondary ion mass spectrometer with 2 mu m resolution. The Sr/Ca ratio exhibits striking diurnal variations, reflecting the daily light cycle. A clear seasonal variation in Sr/Ca is also observed in another longer set of measurements with 50 mu m resolution. Light-enhanced calcification and elemental transportation processes, in giant clam and symbiotic algae, may explain these diurnal and annual variations. This opens the possibility to develop the Sr/Ca ratio from a giant clam shell as an effective proxy for parameters of the daily light cycle.
• Estimation of uncertainty for massive Porites coral skeletal density

  Sowa, K, Watanabe, T, Nakamura, T, Sakai, S, Sakamoto, T

  JAMSTEC Report of Research and Development 独立行政法人海洋研究開発機構 16 31 - 19 1880-1153 2012 [Refereed][Not invited]
   

  Previous studies have not demonstrated the estimate errors in growth parameters (skeletal density, extension rate and calcification rate) for massive coral skeletons. In order to discuss the variability of coral skeletal growth, it is crucial for quantitative evaluation of the parameters with errors. We report the protocol of calculating errors as combined standard uncertainty for coral skeletal density (uρSA) based on ISO/IEC Guide 98–3 (2008). We applied the non-destructive transparent X-ray 2-D imaging scanner, TATSCAN-X1, which enabled to quick and quantitative analysis of the uρSA parameters with digital procedures. We analyzed the annual skeletal density for massive Porites coral collected from Ishigaki Island. The skeletal densities changed from 1.45 to 1.70 g/cm3 and uρSA were ca. 0.02 g/cm3. Our results indicated that the uρSA was derived from the combined effects of 78.5% from the standard uncertainty of deducing of analytical curve (u ln OD (Y)→ρ*t (X)) and 6.3% from that of the sample thickness error (utSA).
• Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific: A new proxy for marine nitrate dynamics

  Atsuko Yamazaki, Tsuyoshi Watanabe, Nanako O. Ogawa, Naohiko Ohkouchi, Kotaro Shirai, Mitsuhiro Toratani, Mitsuo Uematsu

  Journal of Geophysical Research: Biogeosciences 116 (4) doi:10.1029/2011JG001697頁  0148-0227 2011/12/01 [Refereed][Not invited]
   

  To demonstrate the utility of coral skeletons as a recorder of nitrate dynamics in the surface ocean, we collected coral skeletons of Porites lobata and determined their nitrogen isotope composition (δ< sup> 15< /sup> N < inf> coral< /inf> ) from 2002 to 2006. Skeletons were collected at Okinotori Island in southwestern Japan, far from any sources of terrestrial nitrogen. Nitrogen isotope compositions along the growth direction were determined at 800 m intervals (∼1 month resolution) and compared against the skeletal carbon isotope composition (δ< sup> 13< /sup> C< inf> coral-carb< /inf> ), barium/calcium ratio (Ba/Ca), and Chlorophyll-a concentration (Chl-a). From 2002 to 2004, ratios of the δ< sup> 15< /sup> N< inf> coral< /inf> varied between +0.8 and +8.3‰ with inverse variation to SST (r =-0.53). Ba/Ca ratios and Chl-a concentrations were also observed to be high during seasons with low SST. These results suggested that the vertical mixing that occurs during periods of low SST carries nutrients from deeper water (δ< sup> 15< /sup> N< inf> DIN< /inf> +5∼+6‰) to the sea surface. In 2005 onward, δ < sup> 15< /sup> N< inf> coral< /inf> and Ba/Ca ratios also had positive peaks even in high SST during periods of transient upwelling caused by frequent large typhoons (maximum wind speed 30 m/s). In addition, low δ< sup> 15< /sup> N < inf> coral< /inf> (+0.8∼+2.0‰) four months after the last typhoon implied nitrogen fixation because of the lack of typhoon upwelling through the four years record of δ< sup> 15< /sup> N< inf> coral< /inf> . Variations in the δ< sup> 13< /sup> C< inf> coral-carb< /inf> and δ< sup> 15< /sup> N < inf> coral< /inf> were synchronized, suggesting that nitrate concentration could control zooxanthellae photosynthesis. Our results suggested that δ< sup> 15< /sup> N< inf> coral< /inf> holds promise as a proxy for reconstructing the transport dynamics of marine nitrate and thus also a tool for estimating nitrate origins in the tropical and subtropical oceans. Copyright 2011 by the American Geophysical Union.
• Nitrogen isotopes of organic nitrogen in reef coral skeletons as a proxy of tropical nutrient dynamics

  Atsuko Yamazaki, Tsuyoshi Watanabe, Urumu Tsunogai

  GEOPHYSICAL RESEARCH LETTERS 38 0094-8276 2011/10 [Refereed][Not invited]
   

  Understanding tropical nutrient dynamics is essential for quantifying marine productivity. In tropical and subtropical oceans, however, the spatial and continuous observation of nutrients has been scarce because of low nutrient concentration. The nitrogen isotopes of organic nitrogen in coral skeletons (delta(15)Ncoral) could be used to record nitrogenous nutrient origins at oceanic surfaces. Here, we show the intra- and inter-reef variations of delta(15)Ncoral in the western Pacific. The zonal distribution of delta(15)Ncoral was found inside a coral reef corresponding with delta(15)N of seawater nitrate (delta(15)N(nitrate)). The extended analysis of delta(15)Ncoral among various coral reefs also shows a latitudinal gradient from tropical to temperate in the western Pacific. The delta(15)Ncoral records high-resolution dynamics of nitrogenous nutrients through the geologic time scale. Citation: Yamazaki, A., T. Watanabe, and U. Tsunogai (2011), Nitrogen isotopes of organic nitrogen in reef coral skeletons as a proxy of tropical nutrient dynamics, Geophys. Res. Lett., 38, L19605, doi:10.1029/2011GL049053.
• Permanent El Nino during the Pliocene warm period not supported by coral evidence

  Tsuyoshi Watanabe, Atsushi Suzuki, Shoshiro Minobe, Tatsunori Kawashima, Koji Kameo, Kayo Minoshima, Yolanda M. Aguilar, Ryoji Wani, Hodaka Kawahata, Kohki Sowa, Takaya Nagai, Tomoki Kase

  NATURE 471 (7337) 209 - 211 0028-0836 2011/03 [Refereed][Not invited]
   

  The El Nino/Southern Oscillation (ENSO) system during the Pliocene warm period (PWP; 3-5 million years ago) may have existed in a permanent El Nino state with a sharply reduced zonal sea surface temperature (SST) gradient in the equatorial Pacific Ocean(1). This suggests that during the PWP, when global mean temperatures and atmospheric carbon dioxide concentrations were similar to those projected for near-term climate change(2), ENSO variability-and related global climate teleconnections-could have been radically different from that today. Yet, owing to a lack of observational evidence on seasonal and interannual SST variability from crucial low-latitude sites, this fundamental climate characteristic of the PWP remains controversial(1,3-10). Here we show that permanent El Nino conditions did not exist during the PWP. Our spectral analysis of the delta(18)O SST and salinity proxy, extracted from two 35-year, monthly resolved PWP Porites corals in the Philippines, reveals variability that is similar to present ENSO variation. Although our fossil corals cannot be directly compared with modern ENSO records, two lines of evidence suggest that Philippine corals are appropriate ENSO proxies. First, delta(18)O anomalies from a nearby live Porites coral are correlated with modern records of ENSO variability. Second, negative-delta(18)O events in the fossil corals closely resemble the decreases in delta(18)O seen in the live coral during El Nino events. Prior research advocating a permanent El Nino state may have been limited by the coarse resolution of many SST proxies, whereas our coral-based analysis identifies climate variability at the temporal scale required to resolve ENSO structure firmly.
• δ15N in reef coral skeletons as a proxy of tropical nutrient dynamics

  Yamazaki, A, T. Watanabe, U. Tsunogai

  Geophysical Research Letters doi:10.1029/2011GL049053頁  2011 [Refereed][Not invited]
  
• G04005 Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific: A new proxy for marine nitrate dynamics (doi 10.1029/2011JG001697)

  Yamazaki, Atsuko, Watanabe, Tsuyoshi, Ogawa, Nanako O, Ohkouchi, Naohiko, Shirai, Kotaro, Toratani, Mitsuhiro, Uematsu, Mitsuo

  Journal of Geophysical Research-Part G-BioGeo 116 (4) 2169-8953 2011 [Refereed][Not invited]
   

  To demonstrate the utility of coral skeletons as a recorder of nitrate dynamics in the surface ocean, we collected coral skeletons of Porites lobata and determined their nitrogen isotope composition (delta N-15(coral)) from 2002 to 2006. Skeletons were collected at Okinotori Island in southwestern Japan, far from any sources of terrestrial nitrogen. Nitrogen isotope compositions along the growth direction were determined at 800 mu m intervals (similar to 1 month resolution) and compared against the skeletal carbon isotope composition (delta C-13(coral-carb)), barium/calcium ratio (Ba/Ca), and Chlorophyll-a concentration (Chl-a). From 2002 to 2004, ratios of the delta N-15(coral) varied between +0.8 and +8.3 parts per thousand with inverse variation to SST (r = -0.53). Ba/Ca ratios and Chl-a concentrations were also observed to be high during seasons with low SST. These results suggested that the vertical mixing that occurs during periods of low SST carries nutrients from deeper water (delta N-15(DIN); +5 similar to+6 parts per thousand) to the sea surface. In 2005 onward, delta N-15(coral) and Ba/Ca ratios also had positive peaks even in high SST during periods of transient upwelling caused by frequent large typhoons (maximum wind speed 30 m/s). In addition, low delta N-15(coral) (+0.8 similar to+2.0 parts per thousand) four months after the last typhoon implied nitrogen fixation because of the lack of typhoon upwelling through the four years record of delta N-15(coral). Variations in the delta C-13(coral-carb) and delta N-15(coral) were synchronized, suggesting that nitrate concentration could control zooxanthellae photosynthesis. Our results suggested that delta N-15(coral) holds promise as a proxy for reconstructing the transport dynamics of marine nitrate and thus also a tool for estimating nitrate origins in the tropical and subtropical oceans.
• Temperate coral calcification analysis in North-west Pacific.

  Sowa Kohki, Watanabe Tsuyoshi, Sakamoto Tatsuhiko

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 58 149 - 149 2011 

  今後のサンゴの石灰化量変遷を予測するための有用な手段として、サンゴの石灰化応答モデル(以下、応答モデル)構築が挙げられる。そのためには、長期間の古環境(地球化学的知見)と骨格成長(生態学的知見)情報を有するサンゴ骨格分析が有用である。しかしながら、これまで、とりわけ石灰化量変遷に関する地球化学的および生態学的知見を融合した研究は殆ど行われてこなかった。本発表では、温帯サンゴについて両知見を融合させた研究発表を行う。具体的には、温帯サンゴの石灰化変遷量を状態空間モデルで解析し、応答モデル構築に関しての議論を展開する。
• Coral skeletal luminescence - its causes and availability as a paleoenvironmental proxy

  Sowa, K, Watanabe, T, Shimamura, M, Sakamoto, T, Nagao, S

  Journal of the Japanese Coral Reef Society 12 1 - 15 1345-1421 2010/12 [Refereed][Not invited]
  
• Opposed trend of skeletal carbon isotopic ratios found in two different coral species collected from the same site: Genus-dependent responses

  Shimamura, M, Hyeong, K, Watanabe, T, Irino, T, Yoo, C. M, Kim, W. S

  Proceedings of the Eleventh International Coral Reef Symposium 2008 87 - 91 2010 [Refereed][Not invited]
  
• Mineral phase of COCs and fibers in coral skeletons.

  Sowa, K, Watanabe, T, Motai, S, Seto, Y, Nagai, T

  Proceedings of the Eleventh International Coral Reef Symposium 2008 72 - 75 2010 [Refereed][Not invited]
  
• Oxygen and carbon isotopic compositions in Favia coral skeletons from the northernmost coral reef

  Watanabe, T, Shimamura, M, Yamano, H

  Journal of the Japanese Coral Reef Society 11 1 - 8 2009 [Refereed][Not invited]
  
• Reconstructing palaeoenvironments of temperate regions based on high latitude corals at Tatsukushi Bay in Japan

  Yamazaki, A, Watanabe, T, Sowa, K, Nakachi, S, Yamano, H, Iwase, F

  Journal of the Japanese Coral Reef Society 11 1 - 17 1345-1421 2009 [Refereed][Not invited]
  
• Investigation on coral necrosis in massive Porites colony in the Ishigaki Island, Japan deduced from the d18O, d13C and MnCa ratios.

  Kawashima, T, Watanabe, T, Shirai, K, Maekawa, S, Irino, T, Sano, Y

  Chikyukagaku (Geochemistry) 日本地球化学会 43巻 (1) 35 - 42 0386-4073 2009 [Refereed][Not invited]
   

  Coral reefs are increasingly faced to the crisis of decline and death caused by climate changes and anthropogenic influence. These crises were reported in Shiraho coral reefs, the Ishigaki Island, Southwestern Japan, caused by the red soils runoff through the Todoroki River. In order to evaluate the influence of terrestrial inputs on coral skeletal growth and coral death, we have analyzed oxygen and carbon isotopic ratios, as well as Mn/Ca ratio, of coral Porites, skeleton collected from Shiraho reef. The coral colony used in this study was still alive but partly dead when the samples were recovered in 20th September 2006. Oxygen isotopic profile of necrosis part indicates that the death may have occurred in winter 2005 when a strongly positive peak of Mn/Ca ratio was observed in the same growth layer of living part, suggesting that increased terrestrial input during sugar cane harvest and closed water system during lower tide level in winter are a possible cause of coral necrosis in the Shiraho coral reefs.
• Reconstruction of marine lead contaminated source from sclerosponge skeletal Pb isotope.

  Ohmo Kazuto, Watanabe Tsuyoshi, Tanimizu Masaharu, Matsuoka Jyun, Inoue Mayuri, Shirai Kotaro

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 56 28 - 28 2009 

  硬骨海綿とは塊状の炭酸塩骨格をもつ海綿動物の総称であり、その多くは海底洞窟やサンゴ礁付近のクレバスなどの暗がりに生息している。硬骨海綿は生息深度が幅広い（5~600m）・成長速度が遅い（0.2～1.5mm/year）・長寿命である（700年以上）という固有の特徴を有することから、新たな古環境記録媒体としての有用性が検討されている。演者は本研究に先駆け、硬骨海綿の１種である（Acanthochaetetes wellsi）のHigh-Mg calcite骨格を沖縄県久米島で採取し、骨格内の多元素濃度測定を行なった。その結果、硬骨海綿骨格内には他の生物源炭酸塩骨格と比較して鉛元素が非常に高濃度（2~11ppm）で濃集されていることが明らかとなり、さらに特徴的なピークが確認出来た。このような生物源炭酸塩骨格内の鉛元素は、主に鉛鉱山の採掘や有鉛ガソリン等による人為起源の鉛が起源であると考えられている（Desenfant et al.,2006ほか）。これを踏まえ、本研究ではさらに硬骨海綿骨格内の鉛同位体比測定を行ない、生息域周辺の鉛放出源の特定及び時系列での放出源の推移を推定した。
• 北限サンゴ礁から採取されたキクメイシ属サンゴ骨格中の 酸素・炭素同位体比 -中緯度域における高時間分解能古気候アーカイブとしての検討-

  島村 道代, ヒョン キソン, 渡邊 剛, ソ インア, ユ チャンミン, 入野 智久, 杉原 薫, 山野 博哉

  日本地球化学会年会要旨集 日本地球化学会 56 29 - 29 2009 

  世界で最も高緯度に位置する、日本の壱岐サンゴ礁より採取されたキクメイシ属サンゴ骨中の酸素・炭素同位体比を分析し、中緯度域における高時間分解能古気候アーカイブとしての可能性を検討した。まず試料は莢壁と軸柱の骨格構造別に分析し、その結果を生育時の環境記録と対比・検討を行った。この結果、軸柱と莢壁は形成のタイミングが異なっており、キクメイシ属サンゴの場合、莢壁の方がより正確に環境を記録することがわかった。また本研究で用いたサンゴ骨格は、骨格構造自体にも成長パターンの季節的変化が見られた。これらの成果を基に、さらに長期に渡る骨格分析を行い、これらを周辺の環境と対比・検討したのでその成果を報告する。
• Geochemical perspective on coral skeletal growth of temperate Porites and Favia

  Kawamura Takashi, Watanabe Tsuyoshi, Sowa Kohki, Sakamoto Tatsuhiko, Irino Tomohisa, Shimamura Michiyo, Hyeong Kiseong, Sugihara Kaoru, Yamano Hiroya

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 56 25 - 25 2009 

  造礁性サンゴ骨格を用いた古環境復元においては、これまで塊状の群体を形成するハマサンゴ属が主に用いられてきた。キクメイシ属の塊状群体は、ハマサンゴ属のそれよりもさらに高緯度の地域でみられることから、ハマサンゴ属よりも低水温に適応していると考えられている。したがってキクメイシ属の骨格は、従来造礁性サンゴ骨格があまりターゲットにしてこなかった温帯地域での古環境指標として広く利用できる可能性を秘めている。鹿児島県甑島は温帯性の気候帯に属し、ハマサンゴ属とキクメイシ属がどちらも生息している。本研究では、甑島産のハマサンゴとキクメイシの軟X線画像による密度バンドと骨格中の酸素安定同位体比を用いて、両種のサンゴの温帯地域における骨格成長の季節性と、古水温指標としての可能性を比較・検討した。
• Strontium as a time marker for coral growth at high temporal resolution

  Shirai Kotaro, Sowa Kohki, Watanabe Tsuyoshi, Sano Yuji, Clode Peta

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 56 178 - 178 2009 

  サンゴ骨格の昼夜での骨格形成パターンに関する知見は，光量がサンゴ骨格の形成に与える影響など，サンゴの石灰化メカニズムを議論するために重要である．本研究では，サンゴ骨格に自然に取り込まれカルシウムと化学的な挙動が似ているストロンチウム(Sr)を用いて，サンゴ骨格(Porites sp.)に高時間解像度で標識が可能かどうか，昼夜で骨格形成パターンに違いが見られるかを検証した．その結果，他の種で報告されているような昼夜での骨格形成パターンの違いは見られず，Poritesは昼夜で骨格成長部位を変えることなく，連続して成長していることが示唆された．
• Minor and trace element incorporation into branching coral Acropora nobilis skeleton

  Kotaro Shirai, Tatsunori Kawashima, Kohki Sowa, Tsuyoshi Watanabe, Toru Nakaniori, Naoto Takahata, Hiroshi Arnakawa, Yuji Sano

  GEOCHIMICA ET COSMOCHIMICA ACTA 72 (22) 5386 - 5400 0016-7037 2008/11 [Refereed][Not invited]
   

  Chemical and isotopic compositions of the Acropora nobilis skeleton were analyzed at various spatial resolutions to investigate the mechanism by which elements are incorporated into the skeleton. Chemical and isotopic profiles along growth axes of axial and radial corallites did not show seasonal variation, with the exception of the 5180 profile of the axial corallite. Detailed observations of the skeletal structure revealed that the skeletal density increased with distance from the tip because secondarily precipitated aragonite (here called the "infilling" skeleton) filled pore spaces in the "framework" skeleton. Micro-scale element analyses revealed that main part of the infilling skeleton had lower Mg/Ca and higher Sr/Ca and U/Ca than the framework skeleton. At microscale, Sr/Ca and U/Ca were positively correlated with each other, and negatively correlated with Mg/Ca but only weakly. The results showed that the infilling skeleton differed significantly from the adjacent framework skeleton in terms of not only formation chronology but also chemical composition, and that the bulk composition was influenced by the infilling/framework skeletal ratio. In order to use the Acropora skeleton as a paleoclimate archive, the relationship between environmental factors and the chemical composition of each skeletal component needs to be established. (C) 2008 Elsevier Ltd. All rights reserved.
• High resolution stable isotope records of sclreractinian corals near Ishigaki Island: Their implication as a potential paleoclimatic recorder in middle latitude regions

  Michiyo Shimamura, Kiseong Hyeong, Chan Min Yoo, Tsuyoshi Watanabe, Tomohisa Irino, Hoi-Soo Jung

  GEOSCIENCES JOURNAL 12 (1) 25 - 31 1226-4806 2008/03 [Refereed][Not invited]
   

  We propose skeletal delta O-18 of Platygyra, a hermatypic reef building massive coral, as a potential paleo-SST proxy in mid-latitude regions, where the commonly used massive Porites corals are rare. Skeletal delta O-18 ratio (delta O-18(c)) of a Platygyra and Porites corals collected from Ishigaki Island, Japan, shows a clear seasonality corresponding to SST variation. The temperature dependence of the Platygyra coral was estimated, for the first time with appropriate sampling resolution, at -0.219 parts per thousand/degrees C (T = -4.57 delta O-18(c)+ 2.65, r(2) = 0.96). Massive Platygyra colonies show a wide distribution from the tropics to mid-latitudes further northwards than Porites. Platygyra's adaptation to colder water temperatures and strong temperature dependence of delta O-18(c), suggest its application as a potential paleo-SST proxy for mid-latitude regions, where high resolution SST proxies are not available, as well as in tropical to subtropical regions.
• Implication of organic matter in coral skeletons as proxy for paleoenvironmental reconstruction

  Sowa, K, Watanabe, T, Suzuki, N

  Chikyukagaku (Geochemistry) 日本地球化学会 42 (2) 55 - 67 0386-4073 2008 [Refereed][Not invited]
   

  Various information on the geochemical characteristics of seawater is recorded in reef-building coral skeletons, which have been widely utilized for the high temporal resolution (one or two weeks) analysis of paleoenvironment in the tropical ocean. The stable oxygen/carbon isotopic ratios and trace element contents in coral skeletons are generally applied to the paleoenvironmental reconstruction. The paleoenvironmental analysis based on organic matter in coral skeletons, however, has rarely been performed. Organic analysis of coral skeletons has been conducted mainly for the understanding of coral biomineralization. Coral organic matter, which is much less reactive than sedimentary organic matter, can be a useful paleoenvironmental proxy. Combination of organic and inorganic geochemical analyses for coral skeletons will be a powerful tool to provide more information on the paleoenvironment.
• Evaluation of Jeju/Tsushima hermatypic corals as sea surface temperature (SST) recorders

  Kiseong Hyeong, Michiyo Shimamura, Tsuyoshi Watanabe, Hiroya Yamano, Kaoru Sugihara, Jonguk Kim

  Ocean and Polar Research 30 (3) 351 - 359 1598-141X 2008 [Refereed][Not invited]
   

  In an effort to develop high-resolution sea surface temperature (SST) proxies for mid-latitude regions, two massive reef-building coral species, Alveopora and Favia, were collected from Jeju and Tsushima Islands, respectively. Their skeletons were subsequently analyzed for annual growth banding, Sr/Ca and Mg/Ca ratios. Hermatypic corals are thinly distributed in the waters of Jeju Island, where Alveopora japonica was the only dominant coral species. A higher diversity of hermatypic corals were observed in the waters of Tsushima Island, where Favia sp. was the most common coral species and even forming an about 6-m-high reef structure. Both Alveopora and Favia showed annual growth layers consisting of couplets of high- and low-density bands. Sr/Ca ratio of both species and Mg/Ca ratio of Alveopora also showed seasonal variation, likely reflecting SST variation. These results suggest the possibility that Alveopora and Favia species can be used as potential SST proxies. However, this study also highlights the potential growth disturbance of middle latitude corals due to high rainfall during monsoon and low SST during winter. This possibility should be taken into account in the investigation of Sr/Ca(Mg/Ca)-SST relationships.
• Potential of paleoenvironmental reconstruction by using variation of miner elements in skeleton of sclerosponge.

  Ohmori Kazuto, Watanabe tsuyoshi, Shirai Kotarou

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 55 411 - 411 2008 

  硬骨海綿とは塊状の炭酸塩骨格をもつ海綿動物の総称である。近年、大西洋やカリブ海に生息する硬骨海綿の骨格内に保存された各種化学成分が、サンゴやシャコガイなどと同様に過去の環境を保存している可能性が示唆された。一方で硬骨海綿はこれらの炭酸塩骨格生物とは異なり、生息深度が幅広い（5~600m）・成長速度が遅い（0.2～1.5mm/year）・長寿命である（700年以上）という固有の特徴を有することから、数10年周期の気候変動を記録した古環境記録媒体としての有用性が検討されている。本研究では太平洋～インド洋に広く分布する硬骨海綿２種（Acanthochaetetes wellsi：High-Mg calcite骨格, Astrosclera willeyana：Aragonite骨格）を同地点・同水深で採取し、その骨格内の多元素濃度測定を行なう事で、両種の古環境媒体としての有用性及び成長速度の推定を検討する。
• Development of non-destructive and expeditious analysis of coral skeleton for reconstructing paleo-environment ; Coral skeletal growth from digitized images of X-radiographs and chemical compositional variants from Non-Destructive X-Ray Fluorescence

  SOWA KOHKI, WATANABE TSUYOSHI, SAKAMOTO TATSUHIKO, IJIMA KOHICHI, TAKASAWA MASAYOSHI, IRINO TOMOHISA, Aguilar Yolanda M., KASE TOMOKI

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 55 408 - 408 2008 

  本研究では, 非破壊かつ迅速で簡便にサンゴ骨格成長量と俯瞰的な化学組成変動(数ヶ月程度の解像度での季節変動)を捉える分析手法を開発することが目的である。具体的には, 軟X線写真,非破壊蛍光X線地殻コアロガー・微少領域対応型（TATSCAN-F1）とコア対応型(TATSCAN-F2)を用いて, サンゴ骨格成長量と俯瞰的な化学組成変動を時系列に沿って分析する。本研究手法の確立により, 最大150cm長のサンゴコア(推定年齢150年程度)のサンゴ骨格成長量と俯瞰的な化学組成変動を, サンゴコアを数枚に切断することなく, 非破壊で数日以内に分析できる。本講演では, 我々がこれまで鋭意進めてきたそれらの手法の可能性と開発成果を報告する。
• Seasonal variation of nitrogen isotopes in coral skeletons:New proxy for nutrients activity of surface oceans in low latitude

  Yamazaki Atsuko, Watanabe Tsuyoshi, Kawashima Tatsunori, Ogawa Nanako, Ohkouchi Naohiko, Shirai Kotaro, Sano Yuji, Uematsu Mitsuo

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 55 406 - 406 2008 

  サンゴ骨格の窒素同位体比を用いて過去の海洋表層の栄養塩濃度とその起源を復元し、新たな古環境指標としての可能性を検討するため、外洋の沖ノ鳥島と石垣島轟川河口からサンゴ骨格試料を採取し、その成長方向に沿って窒素同位体比・総窒素量を1ヶ月の分解能で測定した。また比較のため、それぞれの窒素同位体比の測線に平行して沖ノ鳥島サンゴではBa/Ca比、Mn/Ca比を、石垣島サンゴではMn/Ca比を測定した。その結果、窒素同位体比・総窒素量の平均値は共に石垣島の方が高く、沿岸の方がサンゴの窒素同化が盛んであることを示した。さらに石垣島サンゴでは、河川からの流入物質の影響が窒素同位体比、総窒素量とMn/Ca比に反映し、沖ノ鳥島サンゴでは、海洋の鉛直混合や湧昇に伴う深層からの栄養塩の供給と海洋表層の窒素固定が窒素同位体比の変動要因として考えられる結果となった。今後、サンゴ骨格の窒素同位体比は海洋の栄養塩の挙動を復元する指標となることが期待できる。
• Potential of submarine-cave sediments and oxygen isotope composition of cavernicolous micro-bivalve as a late Holocene paleoenvironmental record

  Akihisa Kitamura, Nagisa Yamamoto, Tomoki Kase, Shu-ichi Ohashi, Mayumi Hiramoto, Hitoshi Fukusawa, Tsuyoshi Watanabe, Tomohisa Irino, Hiroshi Kojitani, Michiyo Shimamura, Ikuo Kawakami

  GLOBAL AND PLANETARY CHANGE 55 (4) 301 - 316 0921-8181 2007/02 [Refereed][Not invited]
   

  A sediment layer (43 cm thick) and surface sediments (5 cm thick) in a submarine limestone cave (3 1 in water depth) oil the fore-reef slope of le island, off Okinawa mainland, Japan, were examined by visual, mineralogical and geochemical means. Oxygen isotope analysis was performed on the cavernicolous micro-bivalve Carditella iejimensis from both cored sediments and surface sediments, and the water temperature within the cave was recorded for nearly one year. These data show that: (1) water temperature within the cave is equal to that at 30 m deep in the open sea; (2) the biotic and non-biotic environments within the cave have persisted for the past 2000 years; (3) mud-size carbonate detritus is a major constituent of the submarine-cave deposit, and may have come mainly from the suspended carbonate mud produced on the emergent Holocene reef flat over the past two millennia; (4) the delta O-18-derived temperature (T(delta)18(O)) of C. iejiniensis suggests that the species grows between April and July; (5) the T(delta)18(O) of C iejimensis from cored sediments implies that there were two warmer intervals, at AD 340 40 and AD 1000 40, which correspond to the Roman Warm Period and Medieval Warm Period, respectively. These suggest that submarine-cave sediments provide unique information for Holocene reef development. In addition, oxygen isotope records of cavernicolous C. iejimensis are a useful tool to reconstruct century-scale climatic variability for the Okinawa Islands during the Holocene. (c) 2006 Published by Elsevier B.V.
• Variation of geochemical signals in coral skeletons: Environmental changes or biological processes?

  Tsuyoshi Watanabe, Stéphanie Reynaud, Jean-Pierre Cuif, Yannicke Dauphin

  Paleontological Research 10 (4) 359 - 374 1342-8144 2006/12/31 [Refereed][Not invited]
   

  Corals are widely distributed throughout a long stretch of geological time and can provide high-resolution histories of climatic variabilities in the tropics, which play a key role in understanding the Earth's climate system. Geochemical approaches to corals have been widely used for reconstructing palaeoclimates because the geochemistry of the skeleton is believed to vary as a function of several environmental conditions. However, large variations that cannot be ascribed to a single environmental factor have been observed among and/or within calibrations of coral-based proxies. Two main unsolved factors could lead to these large discrepancies: unexpected environmental changes in reefs and unknown biological processes occurring at coral biomineralization sites. In this review, we show the recent progress in dealing with this question by application of coral culture technique and micro analytical methods to skeletal geochemistry in corals and discuss on how the degree of geochemical variation could be affected by environmental changes and how by biological processes during the skeleton's calcification. The next challenge will be to perform high-resolution analysis on cultured corals growing under controlled and/ or constant environmental conditions. Such efforts hold the promise of yielding important new insights into the various biomineralization processes that may affect the chemical and isotopic composition of the skeletons, with the goal of understanding how environmental changes express themselves in geochemical variability. © by the Palaeontological Society of Japan.
• Coral biomineralization(Geochemistry of Sedimentary carbonates)

  WATANABE Tsuyoshi, SHIRAI Kotaro, SHIMAMURA Michiyo

  地球化学 日本地球化学会 40 (3) 221 - 229 0386-4073 2006/08 [Not refereed][Not invited]
   

  Reef-building corals are distributed in the tropical and sub-tropical oceans and can be found as fossils in a significant fraction of the geologic record extending back to the middle Triassic. Their skeletons continuously grow up to one of the largest biological architectures on the earth, which support various marine lives in nutrient poor regions. Moreover, recent global warming gives corals another importance as powerful tool to reconstruct paleoclimate recorded in their skeletons with high-resolution. Understanding mechanism of coral biomineralization is crucial and common subject among...
• Recent advances in coral biomineralization with implications for paleo-climatology: a brief overview. Global Climate Change and Response of Carbon Cycle in the Equatorial Pacific and Indian Oceans and adjacent landmasses

  Watanabe, T, Juillet-Leclerc, A, Cuif, J. P, Rollion-Bard, C, Dauphin, Y, Reynaud, S

  ELSEVIER OCEANOGRAPHY SERIES Elsevier 73 239 - 254 0422-9894 2006 [Refereed][Not invited]
   

  The tropical oceans drive climatic phenomena such as the El Niño-southern oscillation (ENSO) and the Asian–Australian monsoon, which have global scale impacts. In order to understand future climatic developments, it is essential to understand how the tropical climate has developed in the past, on both short and longer timescales. However, good instrumental records are limited to the last few decades. The oxygen isotopic (δ18O) composition and strontium/calcium (Sr/Ca) ratio of massive corals have been widely used as proxies for past changes in sea surface temperature (SST) of the tropical and subtropical oceans, because the geochemistry of the skeleton is believed to vary as a function of several environmental parameters (such as seawater temperature, salinity, light, …). However, recent microanalytical studies have revealed large amplitude variations in Sr/Ca and oxygen isotopic composition in coral skeletons; variations that cannot be ascribed to changes in SST or in salinity. Such micro- and nanometer scale studies of geochemical variations in coral skeletons are still few and somewhat scattered in terms of the species studied and the problems addressed. But collectively they show the great potential for determining chemical variations at length scales of direct relevance to the biomineralization process. For example, it is now possible to measure geochemical variations within the two basic, micrometer-sized building blocks of the coral skeleton: Early mineralization zones (EMZ) and aragonite fibres. Such micro- and nanometer scale observations, in combination with controlled laboratory culturing of corals, hold the promise of yielding important new insights into the various biomineralization processes that may affect the chemical and isotopic composition of the skeletons. One aim of these efforts is to better understand the elemental and isotopic fractionation mechanisms in order to improve the conversion of the geochemical variability into environmental changes.
• Elemental fractionation in biogenic calcium carbonates

  Shirai K, Watanabe T, Takahata N, Sano Y

  Geochimica Et Cosmochimica Acta 70 (18) A588  2006 [Refereed][Not invited]
  
• Deep-sea coral geochemistry: Implication for the vital effect

  K Shirai, M Kusakabe, S Nakai, T Ishii, T Watanabe, H Hiyagon, Y Sano

  CHEMICAL GEOLOGY 224 (4) 212 - 222 0009-2541 2005/12 [Refereed][Not invited]
   

  Deep-sea corals hold a great potential as a key to important aspects of paleoceanography for at least two reasons, 1) they offer temporal high resolution records of deep-sea environment, because they have growth banding structures, 2) and they are well suited for studying vital effects, because the deep-sea environment does not change over short time scales. However, the relationship between the chemical composition of deep-sea coral skeletons and environmental factors is not well understood. In this study, the chemical composition of deep-sea corals was measured in bulk individuals and along skeletal micro-structures. Among the bulk individuals, delta(18)O value and Sr/Ca ratio show a negative but weak correlation with ambient temperature. On the other hand, the Mg/Ca ratio has a positive, weak correlation with the temperature. Large variations were found among samples collected from similar temperature. The variation is up to 3.8 parts per thousand for delta(18)O, 0.9 mmol/mol for Sr/Ca ratios, and 0.78 mmol/mol for Mg/Ca ratios among samples with ambient average temperature within I T. This variation may be due to a large vital effect. The centers of calcification (COCs), which were formed at high calcification rate, have lower Sr/Ca, U/Ca and higher Mg/Ca ratios than surrounding fasciculi. This chemical distribution supports the model that elemental incorporation depends on calcification rate. This suggests that calcification rate is a very important factor for the chemical composition in deep-sea corals and is one of the most significant mechanisms of the vital effect. Because of this large vital effect, further investigations are essential to use the deep-sea coral as a temperature proxy. (c) 2005 Elsevier B.V All rights reserved.
• Life history of the Pliocene scallop Fortipecten, based on oxygen and carbon isotope profiles

  R Nakashima, A Suzuki, T Watanabe

  PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 211 (3-4) 299 - 307 0031-0182 2004/09 [Refereed][Not invited]
   

  Oxygen and carbon isotope profiles from the outer calcite layer of two well-preserved specimens of the Pliocene scallop Fortipecten takahashii exhibit distinct attenuation in their annual ranges throughout the complete growth history of approximately 10 years. The segments of oxygen isotope profiles corresponding to winter or summer extremes were compressed, suggesting growth retardation during extreme water temperatures. These profile compressions correspond well with the positions of growth rings on the outer shell surface. One scallop shell, which evidently grew in warmer environments, based on mean oxygen isotope values, developed growth rings in summer while a second shell with colder mean-temperature values exhibits winter growth rings. A drastic reduction in isotope fluctuation occurred at a shell age of approximately 3 years, and possibly is related to the onset of the reproductive phase, which may have suppressed shell growth in favor of building up reproductive tissue. Sexual maturity brought a change in life habit, from a swimming to a reclining mode, which is clearly shown by the change in shell architecture. Although scallop shells during the juvenile stage may record a complete seasonal cycle, isotopic profiles in the adult stage contain repeated growth breaks. As a result, using isotope signals as paleoenvironmental proxies must be done carefully, at least with scallop shells. (C) 2004 Elsevier B.V. All rights reserved.
• A 60-year isotopic record from a mid-Holocene fossil giant clam (Tridacna gigas) in the Ryukyu Islands: physiological and paleoclimatic implications

  T Watanabe, A Suzuki, H Kawahata, H Kan, S Ogawa

  PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 212 (3-4) 343 - 354 0031-0182 2004/09 [Refereed][Not invited]
   

  We have constructed a 60-year stable isotope record from a C-14-dated fossil giant clam, Tridacna gigas (6216 years BP), at its northernmost latitudinal limit in the geological past, on Kume Island, Central Ryukyu Archipelago, Japan. Stable oxygen (delta(18)O) and carbon (delta(13)C) isotopic analyses are combined with observations of growth lines seen on the inner shell layer. Sixty pairs of summer/winter growth lines, which preserve daily growth increments were observed in the inner shell layer. Two growth phases, characterized by a growth curve and isotopic profiles, are clearly recognized throughout the growth history of this specimen. No significant shifts in average values of the two isotopic ratios were detected during its growth history, although the growth rate varied widely from 1 to 15 mm/year over 60 years, including after the onset of sexual maturity. Spectral analysis of the fossil Tridacna delta(18)O time-series implies that decadal variability observed in the North Pacific Ocean during the past hundred years also existed 6000 years ago. Our study implies that fossil giant clams are one of the best means of inferring isotopic records of annual to decadal climate variations. Giant clams have the advantages of a dense shell, high growth rate, long lifespan, and geographically and geologically broad distributions. (C) 2004 Elsevier B.V. All rights reserved.
• High-resolution reconstruction of palaeoclimstes in tropical sea using stable isotopes and trace elements in biogenic carbonates

  Tsuyoshi Watanabe, Anne Juillet-Leclerc, Jean-Pierre Cuif, Anders Meibom, Yannicke Dauphin, Yuji Sano

  Geochemistry 日本地球化学会 38 (1) 29 - 43 0386-4073 2004 [Refereed][Not invited]
   

  My recent scientific interests have been to reconstruct palaeoclimates in the tropical and sub tropical areas using chemical tracer of biogenic carbonates including coral skeletons and molluscan shells, which have annual and daily growth bands. Understanding the past climate variability in the tropical ocean is a high priority in climate change research. The tropical climate variability has global consequences such as El Nino-Southern Oscillation (ENSO) and Asian-Australian monsoon but the instrumental records in this area are limited only up to past several decades. Recently coral skeletons have been widely used to understand the past climate variability in the tropical ocean. The oxygen isotopic and trace elemental records of living and fossil coral skeletons have provided the sea surface temperature and precipitation over several hundred years. Despite such a great advance, there still remain problems to use coral skeletons for reconstructing palaeoclimates because of complicated biological and physical processes during their formation. Here I would like to introduce recent my works concerned with these problems and solutions using biogenic carbonates in the skeletons of coral reefs dwellers.
• Heterogeneity of chemical compositions in coral skeletons: Investigation of skeletal calcification and implications for coral thermometer

  Tsuyoshi Watanabe, Anne Juillet-Leclerc, Jean-Pierre Cuif, Anders Meibom, Yannicke Dauphin, Yuji Sano

  Geochemistry 日本地球化学会 38 (4) 255 - 264 0386-4073 2004 [Refereed][Not invited]
   

  Massive corals have been widely used as proxies for past changes in sea surface temperature (SST) of the tropical and subtropical oceans because the oxygen isotopic (δ¹⁸O) and strontium/calcium (Sr/Ca) ratios of their aragonitic skeletons are believed to vary quantitatively as a function of the temperature of the ambient sea water. However, recent microanalytical studies using secondary ion mass spectrometry (SIMS) have revealed large chemical heterogeneities for Sr/Ca and oxygen isotopic ratios in coral skeleton, which cannot be explained by temperature variation. The newly developed NanoSIMS has a potential to determine chemical variations within the two basic building blocks of the coral skeleton; centres of calcification and fibers. Such data can provide important new information about the biomineralization process and help constrain the degree to which temperature and/or biological processes affect the composition of skeleton in corals, as well as in biogenetic carbonates formed by other marine organisms.
• Strong biological control over the magnesium distribution in scleractinian corals

  Meibom, A, Cuif J-P, Hillion, F, Constantz, B. R. Juillet-Leclerc, A. Dauphin, Y. Watanabe, T, Dunbar, R

  Geophysical research Letters 31 doi:10.1029/2004GL021313頁  2004 [Refereed][Not invited]
  
• Helium isotopes of seawater in adjacent sea of Nansei Islands, Southwest Japan

  N Takahata, T Watanabe, K Shirai, M Nishizawa, Y Sano

  GEOCHEMICAL JOURNAL 38 (6) 593 - 600 0016-7002 2004 [Refereed][Not invited]
   

  We have measured helium isotopic ratios of 43 water samples with various depths collected in Eastern East China Sea and Northwestern Philippine Sea, adjacent region of Nansei Islands, Southwestern Japan. The He-3/He-4 ratios vary significantly from 0.994 R-atm to 1.242 R-atm where R-atm is the atmospheric ratio of 1.39 x 10(-6). Mid-depth (750-1500 m) samples in this study would be affected by the source of subduction-type mantle helium in the Okinawa Trough. Noble gas abundances (neon, argon, krypton and xenon) were measured in 24 water samples with various depths collected in Northwestern Pacific Ocean and Northwestern Philippine Sea (Nansei Trench). Neon abundances show slight excess relative to air saturated seawater at ambient temperature and salinity. This may be due to either air bubble effect or contamination during the sampling. When these effects are corrected using the neon anomaly, heavier noble gas abundances (argon, krypton and xenon) of samples with the temperature higher than 5 degreesC (shallower than 500 m) agree well with those of calculated air saturated seawater, while the lower temperature samples (deeper than 500 m) indicate anomaly of -7% to +10%.
• Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate

  T Watanabe, MK Gagan, T Correge, H Scott-Gagan, J Cowley, WS Hantoro

  GEOCHIMICA ET COSMOCHIMICA ACTA 67 (7) 1349 - 1358 0016-7037 2003/04 [Refereed][Not invited]
   

  Diploastrea heliopora forms dense, robust, dome-shaped coral colonies throughout the reef ecosystems of the tropical Pacific and Indian Oceans. This slow-growing (2 to 6 mm/yr) coral has the potential to yield continuous paleoclimate records spanning up to 1000 yr for the warmest waters on Earth, the Indo-Pacific Warm Pool, and has a long fossil history as a single recognizable species. Despite the potential of Diploastrea to be an important new paleoclimate archive, little is known about the systematics of geochemical tracers incorporated into its skeleton. To fill this knowledge gap, we compared skeletal delta(18)O signatures in live Diploastrea and Porites colonies from Southwest Lagoon, near Amedee Lighthouse, New Caledonia (at the southern latitudinal limit for Diploastrea) and Alor, Indonesia (in the core area of the Indo-Pacific Warm Pool). We designed a new microsampling technique to minimize smoothing and distortion of the isotopic records due to the complex calyx architecture and slow growth of Diploastrea. High-resolution isotope profiles from the septal portion of the Diploastrea corallite are attenuated, whereas those restricted to the central columella are similar in quality to those extracted from the well-established Porites coral archive. The delta(18)O-temperature relationship for the columellar portion of Diploastrea (-0.18parts per thousand/degreesC) is in good agreement with that derived for a nearby Porites (-0.19parts per thousand/degreesC; Quinn et al., 1996), on the basis of comparison with an in situ sea surface temperature record from Amedee Lighthouse. There is a measurable difference of 0.3 +/- 0.1parts per thousand between the kinetic/biological disequilibrium offsets from seawater delta(18)O composition for Diploastrea and Porites. Despite this offset in mean delta(18)O, Diploastrea accurately records the regional differences in mean temperature and salinity between New Caledonia and the Indo-Pacific Warm Pool. Additional tests show that Diploastrea records El Nino-Southern Oscillation (ENSO) interannual variability in sea surface temperature and salinity across the southwestern Pacific, indicating that it should yield dependable paleo-ENSO records. Based on these results, we propose that D. heliopora has the potential to provide an important new coral archive of tropical paleoclimate. (C) Copyright 2003 Elsevier Science Ltd.
• Pneumothorax and transient pseudohypoaldosteronism in an infant with hydronephrosis

  T Watanabe, A Yamazaki

  PEDIATRIC NEPHROLOGY 18 (1) 62 - 64 0931-041X 2003/01 [Refereed][Not invited]
   

  Pneumothorax and transient pseudohypoaldosteronism have been noted as complications of obstructive uropathy in infancy. However, they are rare complications, and there have been no reports of a patient with both pneumothorax and pseudohypoaldosteronism in obstructive uropathy. Here we describe a case of pneumothorax and transient pseudohypoaldosteronism in an infant with bilateral hydronephrosis due to ureteropelvic junction obstruction. Nephrostomy improved the patient's condition and laboratory findings rapidly. While the exact pathogenic mechanism of pneumothorax in patients with obstructive uropathy is unclear, some biochemical defects due to obstructive uropathy might impair fetal lung maturation, which results in pneumothorax.
• Evaluation of the fidelity of isotope records as an environmental proxy in the coral Montastraea

  T Watanabe, A Winter, T Oba, R Anzai, H Ishioroshi

  CORAL REEFS 21 (2) 169 - 178 0722-4028 2002/07 [Refereed][Not invited]
   

  Many studies of climate variability in the Tropical Ocean have used high-resolution chemical tracer records contained in coral skeletons. The complex architecture of coral skeletons may lead to the possibility of biases in coral records and it is therefore important to access the fidelity of coral geochemical records as environmental proxies. Coral skeletal records from the same coral colony, and even the same corallite, may show large variation due to differing extension rates, formational timing of the skeletal elements, colony topography, and sampling resolution. To assess the robustness of the skeletal record, we present delta(13)C and delta(18)O data based on different sampling resolutions, skeletal elements, and coral colonies of Montastraea faveolata species complex, the primary coral used for climate reconstruction in the Atlantic. We show that various skeletal elements produce different isotopic records. The best sampling rate to resolve the full annual range of sea surface temperature (SST) is 40 samples per year. This sampling frequency also consistently recovered SST variability measured at weekly intervals. A sampling rate of 12 times per year recovered 84% of the annual range recording average monthly SST changes through the year. Six samples per year significantly decreased the ability to resolve the annual SST range. The delta(18)O recorded from two adjacent colonies were very similar, suggesting that this isotope can be trusted to record environmental changes. The delta(13)C, on the other hand, remained highly variable, perhaps as a result of the activity of symbiotic algae (zooxanthellae).
• Seasonal variation of stable isotopic compositions recorded in a laminated tufa, SW Japan

  J Matsuoka, A Kano, T Oba, T Watanabe, S Sakai, K Seto

  EARTH AND PLANETARY SCIENCE LETTERS 192 (1) 31 - 44 0012-821X 2001/09 [Refereed][Not invited]
   

  High-resolution stable isotopic analyses of an annually laminated tufa from Shirokawa, SW Japan, show cyclic variations that correspond to mm-scale summer (dense) and winter (porous) laminae. Both delta O-18 and delta C-13 values are high in winter and low in summer, and correlate well with each other (r = 0.88). Because the delta O-18 content of stream water has remained relatively stable over time, the delta O-18 curve reflects seasonal changes in water temperature. Cyclic variation in delta C-13 suggests that it is controlled by seasonal changes in the delta C-13 of dissolved inorganic carbon in groundwater, which is probably caused by groundwater degassing. This degassing effect is normally strongest during winter when subsurface air is warmer (less dense) than the atmosphere. This decreases P-CO2 in cave air, and the associated degassing of C-13-depleted CO2 from the groundwater increases the delta C-13 value of dissolved inorganic carbon in winter. Calcite was deposited in isotopic equilibrium with stream water. Extreme climatic events, such as drought, can be recorded as anomalies in both the delta O-18 and delta C-13 curves. This study demonstrates that annually laminated tufa can be used for high-resolution analysis of terrestrial paleoclimate. (C) 2001 Elsevier Science BY. All rights reserved.
• Seasonal changes in sea surface temperature and salinity during the Little Ice Age in the Caribbean Sea deduced from Mg/Ca and O-18/O-16 ratios in corals

  T Watanabe, A Winter, T Oba

  MARINE GEOLOGY 173 (1-4) 21 - 35 0025-3227 2001/03 [Refereed][Not invited]
   

  The oxygen isotopic composition (delta O-18) of coral skeletons reflects a combination of sea surface temperature (SST) and the delta O-18 of seawater, which is related to sea surface salinity (SSS). In contrast, the magnesium/calcium (Mg/Ca) ratio of a coral skeleton reflects SST independent of salinity. By using the relationships among coral Mg/Ca ratios, coral delta O-18, seawater delta O-18 and SST, it is possible to determine past SST and SSS uniquely. Such determinations were made and calibrated using the Mg/Ca ratio and the delta O-18 of the modern part of a 3 m long coral core (Montastrea faveolata), collected from the southwest coast of Puerto Rico in the Caribbean Sea where both SST and SSS changes seasonally and the seawater delta O-18 measured at the coral site, Our results yielded three relationships (coral Mg/Ca-SST, delta O-18(coral)-delta O-18(water)-SST. and delta O-18(water)-SSS). With these calibration equations seasonal changes in SST and SSS during the little ice age (LIA) in the Caribbean Sea were reconstructed. The delta O-18 and Mg/Ca ratio of the coral skeleton between 1699 and 1703 suggests that the SST during the LIA was approximately 2 degreesC cooler than present with the SSS showing greater seasonal changes as well. These results are in good agreement with climate-based reconstruction from corals based on oxygen isotopes, although the possibility of some uncertainty remain in our estimation including long-term decadal scale trends in climate. (C) 2001 Elsevier Science B.V. All rights reserved.
• Pretreatment of coral aragonite for Mg and Sr analysis: Implications for coral thermometers

  T Watanabe, M Minagawa, T Oba, A Winter

  GEOCHEMICAL JOURNAL 35 (4) 265 - 269 0016-7002 2001 [Refereed][Not invited]
   

  Trace elements (e.g., Sr, Mg, and U) in coral skeletons are widely used as a potential robust paleothermometers. However, there is little consensus among workers on the chemical pretreatment of skeletal samples, which contain small amounts of organic material and inorganic detritus enriched in many metals compared to the skeleton. We tested the analytical effects of chemical treatment on coral aragonite by comparing several chemical treatments for Mg/Ca and Sr/Ca ratios as well as oxygen and carbon isotopic ratios. Our results suggested that the Sr/Ca ratio and stable isotopic ratios are resistant to chemical treatments. However, organic matter or crystal surfaces in corals could absorb more than 40% of magnesium although 60% of magnesium in coral aragonite substitutes for calcium. Our results suggest that it is expedient to remove impurities by the method outlined here, especially before determining Mg/Ca ratios in corals for paleoenvironmental reconstruction.
• Caribbean sea surface temperatures: two-to-three degrees cooler than present during the Little Ice Age

  A Winter, H Ishioroshi, T Watanabe, T Oba, J Christy

  GEOPHYSICAL RESEARCH LETTERS 27 (20) 3365 - 3368 0094-8276 2000/10 [Refereed][Not invited]
   

  We determined the seasonal environmental conditions during the Little Ice Age (LIA) by interpreting isotope proxies in the coral skeleton of Mantastrea faveolata from the northeast Caribbean. The oxygen isotope composition was determined for three time intervals during the LIA. (1700-1705, 1780-1785, 1810-1815), thought to correspond to the coldest intervals. The period 1984-1989 was used to represent modern calibration conditions. We determined that SSTs from the LIA intervals are nearly 2-3 degreesC cooler than present. LIA cooling in the Caribbean may have resulted from regional oceanic and atmospheric circulation differences, especially in winter. We propose that a trough of cold air from the north Atlantic may have extended farther south than present, into the northern Caribbean. Although there are indications from Pacific corals that seasonality was greater during the LIA, this does not seem to be the case for the Caribbean.
• Daily reconstruction of water temperature from oxygen isotopic ratios of a modern Tridacna shell using a freezing microtome sampling technique

  T Watanabe, T Oba

  JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 104 (C9) 20667 - 20674 0148-0227 1999/09 [Refereed][Not invited]
   

  Daily (1-2 day interval) reconstruction of sea water temperature is calculated via a freezing microtome sampling technique for oxygen isotope analysis and by counting the daily growth lines in a modern Tlidacna (Hippopus hippopus, LINNE, 1758) shell collected from Ishigaki Island, Japan. This method enables the first direct comparison between shell oxygen isotopic values and daily meteorological data. The H. hippopus shell calcifies mainly under isotopic equilibrium with surrounding sea water. The high-resolution profile of delta(18)O of the H. hippopus shell was recorded monthly to seasonal sea surface temperature variations of the local coral reef environment.
• High resolution reconstruction of water temperature estimated from oxygen isotopic ratios of a modern Tridacna shell based on freezing microtome sampling technique

  WATANABE Tsuyoshi, OBA Tadamichi

  地球化学 日本地球化学会 32 (2) 87 - 95 0386-4073 1998/05 [Not refereed][Not invited]
   

  A modern Tridacna (Hippopus hippopus) was collected on September 5,1993 from a coral reef at Ishigaki Island in Ryukyu Archipelago, Japan, in order to investigate the environmental changes recorded in the shell. We adopted freezing microtome technique for high resolution analysis of the oxygen isotope of the shell. A portion of the innner layer, where daily growth lines are observed under a microscope, was cut out vertically from the inner surface. A stick measuring 20x1x2mm was then placed in water and frozen. Using a microtome, 50um interval samples were pealed off the stick in a room mai...
• 266 Comparison of oxygen and carbon stable isotope values of modem Tridacna shells collected from Ishigaki Island with meteorological data

  WATANABE Tsuyoshi, OBA Tadamichi

  Annual Meeting of the Geological Society of Japan 日本地質学会 1996 221 - 221 1996

MISC

• 喜界島におけるCCP解析から明らかになる現生サンゴ群集の礁形成能力

  岸拓未, 山崎敦子, 山崎敦子, 駒越太郎, 渡邊剛, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  26th-  2023
• Holocene High temporal resolution paleoenvironmental reconstruction using Giant clam fossil in Kikaijima Island, Japan

  駒越太郎, 渡邊剛, 渡邊剛, 渡邊剛, 藤田寛之, 内田悠人, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  26th-  2023
• Oxygen isotope thermometer using the skeleton of a living Heliopora coerulea from Kikai-jima Island, Japan.

  津田和忠, 津田和忠, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  26th-  2023
• Comprehensive reconstruction of coral and human memories using high spatiotemporal resolution geoscientific approaches and phenomenological reduction in drama and theatre

  渡邊剛, 渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子, 駒越太郎, 小又寛也, 中村隆志, 宮崎玲奈, 山下恵実  日本地球惑星科学連合大会予稿集(Web)  2023-  2023
• Reconstruction of anthropogenic carbon dioxide uptake on the Kuroshio region using carbon isotopes of coral skeletons

  山崎敦子, 渡邊剛  日本地球惑星科学連合大会予稿集(Web)  2023-  2023
• Changes in oceanic uptake of anthropogenic CO₂ revealed by carbon isotopic analysis in North Pacific coral skeletons

  小山都煕, 小山都煕, 渡邊剛, 渡邊剛, 野尻太郎, KAHNG Samuel E., 山崎敦子, 山崎敦子  月刊海洋  2023
• 100-year climate reconstruction using Sr/Ca ratio and nitrogen isotope in modern Hawaiian coral skeletons

  内山遼平, 内山遼平, 山崎敦子, 山崎敦子, 山崎敦子, 野尻太郎, KAHNG Samuel E, KAHNG Samuel E, KAHNG Samuel E, 角皆潤, 渡邊剛, 渡邊剛, 渡邊剛  日本地球惑星科学連合大会予稿集(Web)  2023-  2023
• 特別座談会：アート×サイエンスの序開

  平田 オリザ, 渡邊 剛, 後藤 明, 加藤 博文, 山内 太郎, 大杉 隼平, 編集, 山崎 敦子  月刊海洋（号外64）  240  -247  2023
• 写真×科学ー過去と未来をつなぐー

  大杉 隼平, 渡邊 剛, 小山 都熙, 山崎 敦子  月刊海洋（号外64）  223  -231  2023
• 喜界島塩道湾における水文学的特徴の解明ならびにハマサンゴ骨格の高解像度古環境解析から復元した1798年から2015年の月降水量変動

  小野寺 那智, 渡邊 剛, 伊藤 早織, 竹内 走, 駒越 太郎, 山崎 敦子  月刊海洋（号外64）  37  -46  2023
• サンゴ骨格の炭素同位体比から解明する北太平洋における人為起源二酸化炭素の海洋吸収

  小山 都熙, 渡邊 剛, 野尻 太郎, Samuel. E. Kahng, 山崎 敦子  月刊海洋（号外64）  26  -36  2023
• 喜界島完新世サンゴ礁の群集組成と炭酸塩生産量の変遷

  山崎 敦子, 小林 航, Kevin Garas, 渡邊 剛  月刊海洋（号外64）  10  -17  2023
• Coral CO2プロジェクトーハワイ産サンゴ骨格のSr/Ca比は水温復元の鍵となり得るかー

  内山 遼平, 渡邊 剛, Samuel. E. Kahng, 山崎 敦子  月刊海洋（2022年9月号）  452  -459  2022/09
• 東アジアの様々な古気候指標に記録された4,200年前の気候イベント

  渡邉 貴昭, 渡邊 剛  月刊海洋（2022年8月号）  376  -385  2022/08
• 緒言サンゴ礁科学研究―多分野異文化融合の拠点へ

  渡邊 剛, 山崎 敦子  月刊海洋（2022年8月号）  373  -375  2022/08
• Marine nitrogen cycle at low latitude inferred from nitrogen isotopes of reef coral skeletons

  山崎敦子, 山崎敦子, 山崎敦子, 内山遼平, 内山遼平, 角皆潤, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  25th-  2022
• An approach to reconstruction of late Jomon period environment using stable isotopic and microstructural analysis of fossil Meretrix lusoria shells from Tanegashima Island

  藤田寛之, 渡邊剛, 渡邊剛, 駒越太郎, 山崎敦子, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  25th-  2022
• Reef-growth potential of the living coral community revealed by CCP analysis in Kikai Island

  岸拓未, 渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子, 山崎敦子, 駒越太郎  日本サンゴ礁学会大会講演要旨集(Web)  25th-  2022
• Changes in oceanic uptake of anthropogenic CO₂ revealed by carbon isotopic and morphological analysis in North Pacific coral skeletons

  小山都熙, 小山都熙, 渡邊剛, 渡邊剛, 野尻太郎, KAHNG Samuel, 山崎敦子, 山崎敦子  日本地球惑星科学連合大会予稿集(Web)  2022-  2022
• 喜界島の白水とハワイビーチの海水から見たサンゴの生息環境の違い

  野尻昊大郎, 野尻昊大郎, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  24th-  2021
• コドラート法を用いた喜界島のサンゴと海藻の被度の比較

  池田雪流, 池田雪流, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  24th-  2021
• 喜界島のサンゴ骨格のδ18OとSr/Ca指標から復元した20世紀の降水量変動

  小野寺那智, 渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  24th-  2021
• 姫川のマイクロプラスチック調査

  山村杏, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  24th-  2021
• サンゴ礁の再生可能エネルギーによる発電

  橋本昊, 橋本昊, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集(Web)  24th-  2021
• ハワイ産サンゴ骨格中Sr/Ca比の水温指標としての可能性

  内山遼平, 渡邊剛, 渡邊剛, KAHNG Samuel, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集  24th-  2021
• ハワイのサンゴ骨格に記録された人為起源二酸化炭素の海洋吸収量の変動

  小山都熙, 小山都熙, 渡邊剛, 渡邊剛, 野尻太郎, KAHNG Samuel E., 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集  24th (Web)-  2021
• Reconstruction of Past Hawaiian Sea Surface Temperature (SST) Using Modern Coral Skeletal Sr/Ca ratio: Decadal Response to Trade Winds

  内山遼平, 渡邊剛, 渡邊剛, 野尻太郎, 渡邉貴昭, 渡邉貴昭, KAHNG Samuel, 山崎敦子, 山崎敦子, 山崎敦子  日本地球惑星科学連合大会予稿集(Web)  2021-  2021
• 日本沿岸に生息する造礁サンゴの緯度勾配下における地球化学的特徴と骨格形成変化

  小山都熙, 渡邊剛, 渡邊剛, 中谷理愛, 杉原薫, 山野博哉, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• UAV画像解析とアミノ酸年代測定法を用いた手法の簡便化による喜界島完新世サンゴ礁段丘の高解像度形成史へのアプローチ

  小田嶋元哉, 渡邊剛, 山崎敦子, 駒越太郎  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• 鹿児島県喜界島のタイドプール内における炭酸系とサンゴの分布

  津田和忠, 津田和忠, 駒越太郎, 山崎敦子, 山崎敦子, 渡邉剛, 渡邉剛  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• 地球規模の環境変動と地域カタストロフィック事変が社会の脆弱性に与える影響:サンゴ礁をフィールドにした文理融合,地域密着型の地球環境学への誘い

  渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• 喜界島のサンゴ骨格のδ¹⁸OとSr/Ca指標から復元した20世紀の降水量変動

  小野寺那智, 渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• 北限域のハマサンゴ骨格の酸素同位体比から解明する1930年代以降の黒潮流路の変遷

  山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛, 井笹純平, 阿部理, 野村恵一  日本サンゴ礁学会大会講演要旨集(Web)  23rd-  2020
• ハマサンゴ属の化石骨格内部に保存される形態を用いた種同定の検討

  日吉慎太郎, 日吉慎太郎, 北野裕子, KAHNG Samuel, 駒越太郎, 山崎敦子, 山崎敦子, 渡邊剛, 渡邊剛  日本サンゴ礁学会大会講演要旨集  23rd-  2020
• ハワイオアフ島の現生サンゴ骨格中微量元素分析による過去70年間の水温変動の復元

  内山遼平, 渡邊剛, 渡邊剛, 野尻太郎, 渡邉貴昭, 渡邉貴昭, KAHNG Samuel. E., 山崎敦子, 山崎敦子, 山崎敦子  日本サンゴ礁学会大会講演要旨集  23rd (Web)-  2020
• サンゴ骨格に記録された人為起源二酸化炭素の北西太平洋域への吸収量の変動史

  渡邊剛, 渡邊剛, 山崎敦子, 山崎敦子, 伊藤早織, 井笹純平, 河村卓, 大森和博, 野尻太郎, 内山遼平, KAHNG Samuel E., 野村恵一, 岩瀬文人, 山野博哉  日本サンゴ礁学会大会講演要旨集  22nd-  2019
• シャコガイ 殻に残された台風の痕跡

  渡邊剛  Ocean Newsletter  461-  4  -5  2019  [Not refereed][Not invited]
  
• サンゴが育んだ島〜喜界島サンゴ礁科学研究所の活動

  渡邊剛  人と国土  45-  (2)  21  -23  2019  [Not refereed][Not invited]
  
• 小氷期最寒冷期と巨大噴火・津波がアイヌ民族に与えた影響Ⅳ

  添田 雄二, 青野 友哉, 富塚 龍, 永谷 幸人, 小林 孝二, 三谷 智広, 菅野 修広, 松田 宏介, 片山 弘喜, 杉山 真二, 渋谷 綾子, 甲能 直樹, 宮地 鼓, 中村 賢太郎, 渡邊 剛  北海道博物館研究紀要  4-  57  -72  2019  [Not refereed][Not invited]
  
• 生物源炭酸塩骨格に刻まれる地球環境変動

  渡邊剛  日本地質学会札幌大会要旨集  2018  [Not refereed][Not invited]
  
• The high-resolution coral records from Con Dao Island, Viet Nam: Impacts of East Asian monsoon to Mekong River discharge and flood events

  PhanTung, 渡邊 剛, 山崎敦子, ShenChuan-Chou  日本地質学会札幌大会要旨集  2018  [Not refereed][Not invited]
  
• Seasonal reconstruction of East Asian Monsoon variability during Mid- to Late Holocene transition deduced from fossil corals in Kikai Island, Japan

  GarasKevin, 渡邊 剛, 山崎敦子  日本地質学会札幌大会要旨集  2018  [Not refereed][Not invited]
  
• 小氷期と巨大噴火・津波がアイヌ民族に与えた影響 II

  添田雄二, 杉山真二, 中村賢太郎, 宮地鼓, 渡邊剛, 甲能直樹, 青野友哉  日本文化財科学会大会研究発表要旨集  35th-  2018
• 人工飼育造礁サンゴの微細組織観察

  甕聡子, 富岡尚敬, 兒玉優, 川野潤, 波利井佐紀, 永井隆哉, 渡邊剛, 伊藤元雄  日本鉱物科学会年会講演要旨(Web)  2018-  2018
• The Impact Enormous Volcanic Eruptions, Tsunamis and the Coldest Period of the Little Ice Age Had on the Ainu III

  Soeda, Y, Aono, T, Mitani, T, Nagaya, Y, Kanno, N, Matuda, K, Nakamura, K, Sugiyama, S, Shibutani, A, Miyaji, T, Kohno, N, Watanabe, T  Bulletin of Hokkaido Museum  3-  119  -132  2018  [Not refereed][Not invited]
  
• Coral research helps predict the future

  Watanabe, T, Yamazaki, A  Impact  December 2017-  (December 2017)  65  -67  2017/12  [Not refereed][Not invited]
  
• Future leadership developments for coral reef research and construction of sustainable coexistence between people and coral reefs

  渡邊 剛, 山崎 敦子, 駒越 太郎, 伊藤 早織, 渡邉 貴昭, 佐々木 友梨, 山崎 紗苗, 藤崎 咲子, 長浜 千夏, 伊地知 告, 佐々木 圭一  月刊海洋  (号外 No.60)  5  -7  2017/07  [Not refereed][Not invited]
  
• 喜界島の完新世サンゴ礁段丘地形

  西村 裕一, 渡邊 剛, 山崎 敦子  月刊海洋  (号外 No.60)  26  -32  2017/07  [Not refereed][Not invited]
  
• 後期更新世海洋酸素同位体ステージ３の喜界島産化石シャコガイ

  駒越 太郎, 渡邊 剛, 佐々木 圭一, 白井 厚太朗, 山崎 敦子  月刊海洋  (号外 No.60)  33  -46  2017/07  [Not refereed][Not invited]
  
• 喜界島産現生および化石コマルキクメイシの骨格を用いた海洋同位体比ステージ３における古環境復元

  中谷 理愛, 渡邊 剛, 山崎 敦子, 渡邉 貴昭, 杉原 薫, Chuan-Chou Shen, 佐々木 圭一  月刊海洋  (号外 No.60)  47  -54  2017/07  [Not refereed][Not invited]
  
• 顕生代の地球環境変動とサンゴ礁

  山崎 敦子, 渡邊 剛  月刊海洋  (号外 No.60)  133  -141  2017/07  [Not refereed][Not invited]
  
• 台湾緑島の造礁サンゴを用いた子時間解像度の古環境解析：その１－水温計キャリブレーション－

  池田 昌隆, 渡邊 剛, 大森 一人, 渡邉 貴昭, 山崎 敦子, Chiang Hong Wei, Chuan-Chou Shen  月刊海洋  49-  (3)  166  -172  2017/03  [Not refereed][Not invited]
  
• ハマサンゴ骨格から復元した奄美大島住用湾における土砂流出

  伊藤 早織, 渡邊 剛, 矢野 恵美, 渡邉 貴昭  月刊海洋  49-  (3)  155  -165  2017/03  [Not refereed][Not invited]
  
• 喜界島ジオ・エコ統合モニタリングシステム－地球環境変動の解明とサンゴ礁生態系への影響の評価と監視－

  渡邊 剛, 山崎 敦子  月刊海洋  49-  (3)  121  -124  2017/03  [Not refereed][Not invited]
  
• サンゴコアを用いた黒潮海流域における海水中236U/238U同位体比復元

  坂口 綾, 野村 知哉, Peter Steier, 山川 茜, 渡邊 剛, 山野 博哉  月刊海洋  49-  (2)  111  -117  2017/02  [Not refereed][Not invited]
  
• オマーン産サンゴ記録から紐解く気候変動と古代文明の遷移

  渡邉 貴昭, 渡邊 剛, 山崎 敦子, Miriam Pfeiffer・Michel R Claereboudt  月刊海洋  49-  (2)  99  -110  2017/02  [Not refereed][Not invited]
  
• フィールドワークにおけるFeigl溶液およびMeigen溶液を用いた生物源炭酸塩試料の続成作用の評価

  駒越 太郎, 渡邊 剛, Kevin Garas, 山崎 敦子  月刊海洋  49-  (2)  71  -80  2017/02  [Not refereed][Not invited]
  
• 喜界島サンゴ礁科学研究所の３年間の歩み－喜界島サンゴ礁科学研究所特別号（続報）－

  山崎 敦子, 渡邊 剛  月刊海洋  49-  (2)  63  -66  2017/02  [Not refereed][Not invited]
  
• 鹿児島県喜界島の現生ハマサンゴを用いた環境復元

  梶田展人, 梶田展人, 山崎敦子, 山崎敦子, 伊藤早織, 渡邊剛, 渡邊剛  月刊海洋  2017
• 造礁サンゴ骨格形成に共生藻と海水Mg/Caモル比が与える影響

  甕聡子, 川野潤, 波利井佐紀, 兒玉優, 富岡尚敬, 伊藤元雄, 渡邊剛, 永井隆哉  日本鉱物科学会年会講演要旨(Web)  2017-  2017
• 小氷期最寒冷期と巨大噴火・津波がアイヌ民族に与えた影響 III

  添田 雄二, 青野 友哉, 永谷 幸人, 渋谷 綾子, 中村 賢太郎, 菅野 修広, 松田 宏介, 三谷 智広, 宮地 鼓, 渡邊 剛, 甲能 直樹  北海道博物館研究紀要  2-  49  -60  2017  [Not refereed][Not invited]
  
• 沈みゆくハワイと浮き続ける喜界島のサンゴ礁

  渡邊 剛, 山崎 敦子  月刊海洋  (号外 No.60)  8  -17  2017  [Not refereed][Not invited]
  
• Paleo-climate reconstruction using corals from Kikai Island, Japan

  梶田 展人, 山崎 敦子, 伊藤 早織, 渡邊 剛  海洋. 号外 = Kaiyo monthly : カラー版  (60)  55  -62  2017  [Not refereed][Not invited]
  
• 幼サンゴ飼育実験を用いたサンゴ骨格のバリウム／カルシウム比栄養塩濃度の指標の開発

  渡邊剛  平成２７年度琉球大学共同利用・共同研究事業報告書  2016  [Not refereed][Not invited]
  
• サンゴからなる津波石の骨格調査に基づく南西諸島周辺の津波履歴の解明

  渡邊剛  平成２５年度東京大学地震研究所共同利用地震・火山噴火の解明と予測に関する公募研究課題研究実績報告書  2016  [Not refereed][Not invited]
  
• カワシンジュガイ殻を用いた北海道の河川系における自然環境評価手法の高精度化

  渡邊 剛, 鈴木まゆみ  北海道河川財団研究所紀要  14-  109  -127  2016  [Not refereed][Not invited]
  
• サンゴ骨格に記録される地震イベント

  伊藤早織, 渡邊 剛, 山崎敦子, TeddyEkaPutra, 西村裕一  月刊海洋  号外 No.56-  60  -71  2016  [Not refereed][Not invited]
  
• シャコガイ殻を用いた高時間解像度の環境解析 -沖ノ鳥島シラナミガイ殻に刻まれた台風の痕跡-

  駒越太郎, 渡邊 剛, 白井厚太朗, 山崎敦子, 植松光夫  月刊海洋  号外 No.56-  80  -93  2016  [Not refereed][Not invited]
  
• オマーン産サンゴ骨格を用いた環境復元

  渡邉貴昭, 渡邊 剛, 山崎敦子, Miriam Pfeifer, Dieter GarbeSchönberg・Michel R.Claereboudt  月刊海洋  号外 No.56-  136  -145  2016  [Not refereed][Not invited]
  
• 太平洋域に生息する硬骨海綿骨格の地球科学的特徴

  大森一人, 渡邊 剛  月刊海洋  号外 No.56-  152  -158  2016  [Not refereed][Not invited]
  
• 炭酸塩生産と海洋の栄養塩は大気二酸化炭素濃度の変動 を支配するのか?

  山崎敦子, 渡邊 剛  月刊海洋  号外 No.56-  159  -167  2016  [Not refereed][Not invited]
  
• サンゴロジー：サンゴ礁地球環境学

  渡邊剛  月刊海洋  号外 No.56-  168  -173  2016  [Not refereed][Not invited]
  
• 小氷期最寒冷期と巨大噴火・津波がアイヌ民族に与えた影響Ⅰ

  添田雄二, 青野友哉, 永谷幸人, 渡邊 剛, 渋谷綾子, 甲能直樹  北海道博物館研究紀要  1-  119  -126  2016  [Not refereed][Not invited]
  
• サンゴ礁科学研究所と今後の展望—喜界島サンゴ礁科学研究所設立記念特別号

  渡邊 剛, 山崎 敦子  月刊海洋  号外 No.56-  5  -8  2016  [Not refereed][Not invited]
  
• 複合的なアプローチによる生物源炭酸塩骨格を用いた地球環境変動の解明

  渡邊剛  日本学術振興会・若手研究者戦略的海外派遣事業（頭脳循環を加速する若手研究者戦略的海外派遣プログラム）事業報告書  2015  [Not refereed][Not invited]
  
• 幼サンゴ飼育実験を用いたサンゴー褐虫藻共生系のバイオミネラリゼーションの解明

  渡邊剛  平成２７年度琉球大学共同利用・共同研究事業報告書  2015  [Not refereed][Not invited]
  
• 生物炭酸塩骨格の窒素同位体比を用いた過去の栄養塩環境の復元

  渡邊剛  平成25年度東京大学大気海洋研究所柏地区外来研究員報告書  2014  [Not refereed][Not invited]
  
• 北海道における小氷期最寒冷期の実態とアイヌ民族との関係Ⅲ-伊達市カムイタプコプ下遺跡での調査速報-

  添田雄二, 菅野修広, 青野友哉, 永谷幸人, 三谷智広, 中村賢太郎, 松田宏介, 河畑敦史, 上中央子, 宮地 鼓, 渡邊 剛, 渋谷綾子, 伊達元成  北海道開拓記念館 研究紀要  42-  (42)  81  -96  2014  [Not refereed][Not invited]
  
• 古環境復元における貝塚研究の有用性-アイヌ文化期を例に-

  添田雄二, 渡邊 剛  日本考古学協会2014年度 伊達大会研究発表資料集  223  -231  2014  [Not refereed][Not invited]
  
• 北海道伊達市有珠における小氷期最寒冷期の古環境-陸上および海洋環境、積雪量等の復元と人との関わり-

  添田雄二, 渡邊 剛, 宮地 鼓, 上中央子, 杉山真二, 渋谷綾子, 青野友哉, 永谷幸人  日本第四紀学会  2014  [Not refereed][Not invited]
  
• The 90-year variation of north Atlantic nitrogen fixation in the Caribbean coral skeletons

  Yamazaki Atsuko, Hetzinger Steffen, von Reumont Jonas, Manfrino Carrie, Tsunogai Urumu, Watanabe Tsuyoshi  Abstracts of Annual Meeting of the Geochemical Society of Japan  61-  (0)  189  -189  2014  [Not refereed][Not invited]
   

  本研究では北大西洋の熱帯域に位置するカリブ海ケイマン諸島に生息する造礁サンゴ骨格から過去90年間の窒素固定の変遷を復元した。サンゴ骨格中に保存されている有機物の窒素同位体比を過去90年間分年単位で分析した結果、カリブ海の窒素固定量は過去90年間で減少傾向にあること、そして海水温に伴って数十年規模で変動しており、高水温時に窒素固定が増大してきたことが推定された。本講演では復元された窒素固定の変遷と温暖化および数十年規模の大気-海洋相互作用との関係を議論する。
• 枝状サンゴ骨格の微細組織観察

  MOTAI SATOKO, NAGAI TAKAYA, SOWA KOKI, KAWANO JUN, WATANABE TSUYOSHI  日本鉱物科学会年会講演要旨集  2013-  269  -269  2013/09/05  [Not refereed][Not invited]
  
• 化石サンゴ骨格の高時間解像度窒素同位体比変動の復元

  渡邊剛  平成24年度東京大学大気海洋研究所柏地区外来研究員報告書  2013  [Not refereed][Not invited]
  
• カワシンジュガイ及び牡蠣殻を用いた河川ー湿原ー河口域環境システムの高時間解像度復元

  渡邊剛  平成25年度河川整備基金助成研究報告書  2013  [Not refereed][Not invited]
  
• 造礁性サンゴ骨格の窒素同位体比を用いた貧栄養海域における新たな栄養塩指標の開発

  渡邊剛  平成25年科学研究費助成事業 研究成果報告書  2013  [Not refereed][Not invited]
  
• 国際サンゴ礁地球環境学シンポジウム

  渡邊剛  平成25年度総長室事業推進経費（公募型プロジェクト研究等支援経費）事業報告書  2013  [Not refereed][Not invited]
  
• Conditions of the Coldest Period of the Little Ice Age in Hokkaido, and their Relationship with the Ainu(2)Preliminary Survey Reports from the Kamuitapukopushita Site in Date City

  添田雄二, 青野友哉, 菅野修広, 永谷幸人, 河畑敦史, 三谷智広, 中村賢太郎, 宮地 鼓, 渡邊 剛, 伊達元成, 上中央子  北海道開拓記念館研究紀要  (41)  43  -58  2013  [Not refereed][Not invited]
  
• 枝状サンゴ骨格の微細組織観察

  MOTAI SATOKO, NAGAI TAKAYA, SOWA KOKI, KAWANO JUN, WATANABE TSUYOSHI  日本地球化学会年会講演要旨集  60th-  288  2013  [Not refereed][Not invited]
  
• 長寿カワシンジュガイから紐解く別寒辺川流域における土地利用変遷と河川環境史

  渡邊剛  平成24年度河川整備基金助成研究報告書  2012  [Not refereed][Not invited]
  
• 北海道における小氷期最寒冷期の実態とアイヌ民族との関係Ⅰ–伊達市カムイタプコプ下遺跡およびポンマ遺跡での調査報告–

  添田雄二, 青野友哉, 菅野修広, 松田宏介, 中村賢太郎, 上中央子, 三谷智広, 渡邊 剛, 宮地 鼓, 鈴木明彦, 圓谷昴史, 鈴木正章, 伊達元成  北海道開拓記念館研究紀要  40-  (40)  123  -142  2012  [Not refereed][Not invited]
  
• Nano- to Micro-scale texture observations of Coral Skeletons

  MOTAI Satoko, NAGAI Takaya, SOWA Kohki, WATANABE Tsuyoshi  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2011-  (0)  255  -255  2011/09/05  [Not refereed][Not invited]
   

  It is general known that reef coral skeletons are consisted of aragonite (CaCO₃) based on the result of XRD. The other hand, chemical analyses reveal that coral skeletons include variety elements. One of these elements Sr is displace Ca in aragonite. The other elements in coral skeleton like Mg, Al, Na, S and so on, do not replace Ca. Some of them are considered to related the organic matrix, but only S is confirmed the related organic matrix. Although the fluctuation of Mg/Ca and Na/Ca ratio reflect the surrounding changes during the coral skeletons growth, it is poorly know how these elements are captured into coral skeleton. We exam the possibility these elements may take into as mineral except aragonite through the observations from nano to micron meter order.
• Skeletal micro-structures and the variety of trace elements in Pacific sclerosponges

  大森 一人, 渡邊 剛, 白井 厚太朗  Kaiyo monthly  43-  (7)  372  -378  2011/07
• Isotopic and trace elemental distributions in daily growth lines of giant clam: could Tridacna shells record daily environmental changes?

  渡邊 剛, 岨 康輝, 白井 厚太朗  Kaiyo monthly  43-  (7)  366  -371  2011/07  [Not refereed][Not invited]
  
• スマトラ沖造礁性サンゴ骨格を用いた過去数百年間の地震及び津波履歴の高精度復元

  渡邊剛  平成23年度科学研究費助成事業（科学研究費補助金）研究成果報告書  2011  [Not refereed][Not invited]
  
• 生物源炭酸塩骨格を用いた超高時間分解能古環境解析

  渡邊 剛, 白井厚太朗, 佐野有司, 高畑直人, 大森一人, 岨 康輝  東京大学大気海洋研究所学際連携研究報告書  2011  [Not refereed][Not invited]
  
• カワシンジュガイを用いた北海道の河川環境変遷史の解明

  渡邊剛  平成23年度河川整備基金助成研究報告書  2011  [Not refereed][Not invited]
  
• Coral nitrogen isotope recorded seasonal variation of terrestrial nitrate into coral reef

  Yamazaki Atsuko, Watanabe Tsuyoshi, Tsunogai Urumu  Abstracts of Annual Meeting of the Geochemical Society of Japan  58-  (0)  13  -13  2011  [Not refereed][Not invited]
   

  サンゴ礁への陸起源の栄養塩の負荷はサンゴ礁を衰退させる原因のひとつとして考えられている。本研究では、造礁性サンゴ骨格に含まれる微量の有機物中の窒素同位体比がサンゴ礁に流入した陸起源物質の指標となるか検討するため、石垣島白保サンゴ礁轟川河口の造礁性サンゴ骨格の窒素同位体比の分布を調べ、礁内の海水および河川水の硝酸の窒素同位体比分布と比較した。その結果、造礁性サンゴと硝酸の窒素同位体比が一致することを発見した。次に、同研究地点で採取したサンゴ骨格コアの窒素同位体比の季節変動を復元した。その季節特性は石垣島の降水量の季節変化と同じパターンを示しており、また硝酸の窒素同位体比の季節変動とも一致していた。本研究の結果から、造礁性サンゴの窒素同位体比はサンゴ礁に流入する陸起源硝酸の変動を復元する指標に利用可能であることが示唆された。
• Study on the Little Ice Age during the Ainu culture period and its impact: research report at the Ponma site in Date City and Suehiro2 sites in Chitose City

  添田雄二, 山田悟郎, 鈴木明彦, 都郷義寛, 池田陽香, 渡邊 剛, 吉本充宏, 早田 勉, 中村賢太郎, 青野友哉, 松田淳子, 久原直利, 菅野修広, 赤松守雄  Bulletin of the Historical Museum of Hokkaido  (39号)  73頁  -90頁  2011  [Not refereed][Not invited]
  
• A Mineralogical Consideration on the Growth Process of Aragonite in Coral Skeletons

  MOTAI Satoko, NAGAI Takaya, SOWA Kohki, WATANABE Tsuyoshi, SAKAMOTO Naoya, YURIMOTO Hisayoshi  日本鉱物科学会年会講演要旨集  2010-  (0)  84  -84  2010/09/23  [Not refereed][Not invited]
  
• 造礁性サンゴ骨格中の酸素・炭素同位体比を用いた中緯度温帯域における環境復元

  渡邊 剛, 河村 卓  平成22年度高知大学海洋コア総合研究センター全国共同利用研究利用成果報告書  2010  [Not refereed][Not invited]
  
• レーザーアブレーションICP-MSを用いた生物源炭酸塩骨格の微量元素分析

  渡邊 剛, 白井厚太朗, 大森一人  東京大学海洋研究所国際沿岸海洋研究センター外来研究員報告書  2010  [Not refereed][Not invited]
  
• カワシンジュガイによる河川環境評価法を利用した100年間の環境変動要因の抽出

  渡邊剛  平成22年度河川整備基金助成研究報告書  2010  [Not refereed][Not invited]
  
• サンゴ骨格の高時間解像度窒素同位体比分析による古海洋学的研究

  渡邊剛  成22年度東京大学大気海洋研究所柏地区外来研究員報告書  2010  [Not refereed][Not invited]
  
• 伊達市ポンマ遺跡における地質学的・考古学的発掘調査ー速報ー

  添田雄二, 青野友哉, 菅野修広, 山田悟郎, 池田陽香, 鈴木明彦, 都郷義寛, 渡邊 剛, 早田 勉, 赤松守雄  北海道開拓記念館調査報告  (49)  75  -86  2010  [Not refereed][Not invited]
  
• The influence of Kuroshio transport on the skeletal 15N in corals collected from Tatsukushi Bay, Kochi

  Yamazaki Atsuko, Watanabe Tsuyoshi, Tsunogai Urumu, Nakachi Shuu, Yamano Hiroya, Iwase Fumihito  Abstracts of Annual Meeting of the Geochemical Society of Japan  57-  (0)  99  -99  2010  [Not refereed][Not invited]
   

  高知県西南部に生息する造礁性サンゴ骨格の窒素同位体比分析から黒潮による海洋環境の変動が造礁性サンゴ骨格にどのように記録されているかを検証した。サンゴ骨格の窒素同位体比と観測により求められる黒潮流量を比較したところ，サンゴ骨格の窒素同位体比変動は黒潮による栄養塩濃度の変化を示し，黒潮の影響が強いときには貧栄養のため、窒素固定生物による窒素固定が行われている様子が示唆された。本研究の結果から造礁性サンゴ骨格の窒素同位体比は黒潮流量の変動を復元する唯一の指標となり得ることが期待される。
• Investigation on coral necrosis in massive Porites colony in the Mouth of Todoroki river, Ishigaki Island, Japan deduced from the δ^O, δ^C and Mn/Ca ratios

  KAWASHIMA Tatsunori, WATANABE Tsuyoshi, SHIRAI Kotaro, MAEKAWA Satoshi, SHIMAMURA Michiyo, IRINO Tomohisa, SANO Yuji  Chikyukagaku  43-  (1)  35  -42  2009/03/30  [Not refereed][Not invited]
   

  Coral reefs are increasingly faced to the crisis of decline and death caused by climate changes and anthropogenic influence. These crises were reported in Shiraho coral reefs, the Ishigaki Island, Southwestern Japan, caused by the red soils runoff through the Todoroki River. In order to evaluate the influence of terrestrial inputs on coral skeletal growth and coral death, we have analyzed oxygen and carbon isotopic ratios, as well as Mn/Ca ratio, of coral Porites, skeleton collected from Shiraho reef. The coral colony used in this study was still alive but partly dead when the samples were ...
• サンゴコアセンター構想構築のための若手研究者ネットワーク形成

  渡邊剛  平成21年度北海道大学総長室重点配分経費（公募型プロジェクト研究支援事業経費）研究成果報告書  2009  [Not refereed][Not invited]
  
• Impacts of global warming and ocean acidification on coral reef ecosystems at their northern latitude limit in Japan

  Tsuyoshi Watanabe  Abstract of the Interim Report  2009  [Not refereed][Not invited]
  
• 限域に分布する造礁サンゴを用いた温暖化とその影響の実態解明に関する研究

  渡邊 剛, 杉原 薫, 山野博哉, 島村道代, 中村隆志  地球規模研究総合推進費地球規模研究総合推進費平成20年度-21年度ー終了研究成果報告集-革新型研究開発領域-  49  -94  2009  [Not refereed][Not invited]
  
• 中期鮮新世温暖期におけるエルニーニョ現象の挙動の解明

  渡邊剛  平成21年度文科省科学研究費補助金研究成果報告書  5頁  2009  [Not refereed][Not invited]
  
• カワシンジュガイ殻の成長線及び化学組成を用いた新たな河川域の環境変遷指標の開発

  渡邊剛  平成20年度河川整備基金助成実績報告書  5頁  2009  [Not refereed][Not invited]
  
• 長生きサンゴが記録する環境の話

  渡邊剛  国際サンゴ礁研究 モニタリングセンター ニュースレター Lagoon  13巻-  5頁  -8頁  2009  [Not refereed][Not invited]
  
• 北限域に分布する造礁サンゴを用いた温暖化とその影響の実態解明に関する研究

  渡邊 剛, 杉原 薫, 山野博哉, 島村道代, 中村隆志  地球規模研究総合推進費平成2０年度研究成果—中間成果報告集  1巻-  753頁  -779頁  2009  [Not refereed][Not invited]
  
• Water Model Experiment on the Behavior of an Argon Bubble Rising Near the Immersion Nozzle(Ironmeking)

  Watanabe Tsuyoshi, IGUCHI Manabu  Tetsu- to- Hagane  94-  (8)  271  -277  2008/08/01  [Not refereed][Not invited]
   

  Attack of a large argon bubble onto the meniscus in the continuous casting mold is considered to be one of main causes for the mold powder entrapment. The immersion nozzle is poorly wetted by molten steel and, accordingly, an argon bubble rising near the immersion nozzle attaches preferably to it. Its rising velocity has a significant effect on the mold powder entrapment. Water model experiments are carried out to reveal the rising velocity of an argon bubble rising along the immersion nozzle. Water and air are used as the models for molten steel and argon gas, respectively. The immersion n...
• サンゴ骨格のバイオミネラリゼーションの解明

  渡邊 剛, 永井隆哉  物質構造科学研究所放射光共同利用実験研究報告書  2008  [Not refereed][Not invited]
  
• レーザーアブレーション・ICP-MSを用いた二枚貝及びサンゴ試料の微量元素分析

  渡邊剛  東京大学海洋研究所国際沿岸海洋研究センター外来研究員報告書  2008  [Not refereed][Not invited]
  
• Scallop shells as archives of environmental and ecological changes

  中島 礼, 鈴木 淳, 渡邊 剛  Chikyu Monthly  (59)  46  -52  2008
• Microstructure Observations on Coral Skelton

  Motai Satoko, Nagai Takaya, Sakamoto Naoya, Sowa Kohki, Watanabe Tuyoshi, Yurimoto Hisayoshi  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2008-  (0)  175  -175  2008  [Not refereed][Not invited]
   

  Mineral phase identification of the coral skeletal microstructure is important for reconstructing the paleo-climate. Especially, chemical composition of Porites sp. is widely used as a paleo-environment variant. For example, it is believed that Sr/Ca ratio in coral skeletons is sensitive to temperature of seawater. Recently, Greegor et al. (1997) reported that as much as 40% of strontium (Sr) in coral aragonite existed as a SrCO₃ end member by using XANES and EXAFS. This should be a very serious problem, when we apply the Sr/Ca ratio to reconstruct the paleo-environment. However, since there has been no direct mineral identification of SrCO₃, we have carefully observed Porites sp. by FE-ASEM and ATEM in order to identify mineral phases in the coral skeletal.
• 黒潮が育む高緯度域のサンゴ礁環境変動の復元

  山崎敦子, 渡邊 剛  黒潮生物研究財団研究助成中間報告書  http://www.kuroshio.or.jp/inde  2008  [Not refereed][Not invited]
  
• サンゴ礁に棲息する生物の骨格に記録された地球環境変動

  渡邊剛  日本サンゴ礁学誌ニュースレター  (40号)  川口賞受賞者の声欄頁  2008  [Not refereed][Not invited]
  
• サンゴ礁と地球環境変動

  渡邊剛  平成20年度北海道大学公開講座テキスト；持続可能な社会と北海道発見 - 地球環境と私のくらし -  37頁  -41頁  2008  [Not refereed][Not invited]
  
• Isotopic and trace elemental distributions in daily growth lines of giant clam-Could Tridacna shells record daily environmental changes?

  渡邊 剛, 岨 康輝, 白井厚太朗, 石村豊穂, 坂井三郎, 横山一己, 角皆 潤, 佐野有司  Chikyu monthly  30巻-  (7)  316頁  -321頁  2008  [Not refereed][Not invited]
  
• 太平洋に生息する硬骨海綿の微細構造および微量元素変動

  大森一人, 渡邊 剛, 白井厚太朗, 菅 浩伸  月刊地球  30巻-  322頁  -328頁  2008  [Not refereed][Not invited]
  
• ホタテガイ類の貝殻に記録された生態と環境

  中島 礼, 鈴木 淳, 渡邊 剛, 川幡穂高  月刊地球  59巻-  46頁  -52頁  2008  [Not refereed][Not invited]
  
• Minor and trace element geochemistry of a branching coral Acropora sp skeleton

  K. Shirai, N. Takahata, H. Amakawa, T. Watanabe, T. Kawashima, K. Sowa, Y. Sano  GEOCHIMICA ET COSMOCHIMICA ACTA  71-  (15)  A933  -A933  2007/08  [Not refereed][Not invited]
  
• Mineral phase identification of coral skeletal microstructure

  K. Sowa, T. Watanabe, Y. Seto, S. Motai, T. Nagai  GEOCHIMICA ET COSMOCHIMICA ACTA  71-  (15)  A958  -A958  2007/08  [Not refereed][Not invited]
  
• ナノシムスを用いた硬骨海綿骨格の高解像度分析による低緯度地域の地球環境変動の解析及び海洋汚染の評価

  渡邊剛  平成19年度東京大学大気海洋研究所柏地区外来研究員報告書  2007  [Not refereed][Not invited]
  
• サンゴ骨格の日輪構造内における酸素同位体比組成

  WATANABE TAKESHI, SOWA KOKI, SAKAMOTO NAOYA, YORIMOTO YORIYOSHI  日本地球化学会年会講演要旨集  54th-  239  2007  [Not refereed][Not invited]
  
• Non-heterogenous oxygen isotopic distribution in coral microstructure.

  Watanabe, T, Sowa, K, Sakamoto, N, Yurimoto, Y  Geochimica et Cosmochimica Acta.  71巻-  (15号)  A1092頁  2007  [Not refereed][Not invited]
  
• Life history of the extinct scallop Fortipecten takahashii, reconstructed from oxygen isotope analysis

  中島 礼, 鈴木 淳, 渡邊 剛, 蓑島佳代, 外西奈津美, 川幡穂高  Chishitsu news  632巻-  (632)  7頁  -12頁  2007  [Not refereed][Not invited]
  
• Skeletal structures and chemical components in reef-building corals

  Watanabe, T, Shimamura, M, Yamazaki, A  Chishitsu News  639巻-  (632)  29頁  -34頁  2007  [Not refereed][Not invited]
  
• 生物源炭酸塩骨格の微少領域における化学組成の不均質

  渡邊剛  平成18年度東京大学大気海洋研究所柏地区外来研究員報告書  2006  [Not refereed][Not invited]
  
• 生物源炭酸塩骨格の微少領域における化学組成の不均質性

  渡邊剛  平成17年度東京大学大気海洋研究所柏地区外来研究員報告書  2005  [Not refereed][Not invited]
  
• 地球温暖化に対する造礁性サンゴの応答

  渡邊剛  公益信託エスペック地球環境研究・技術基金 平成17年度助成金 報告書  2005  [Not refereed][Not invited]
  
• サンゴ・シャコガイ化石を用いた縄文海進期における黒潮域の古環境復元

  渡邊剛  パレオラボ研究助成 報告書  2005  [Not refereed][Not invited]
  
• 栄養塩の付加による造礁性サンゴの骨格形成への影響の評価

  渡邊剛  平成１7年度（財）クリタ水・環境科学振興財団（Kurita Water And Environment Foundation）、研究助成研究報告書  2005  [Not refereed][Not invited]
  
• ニューカレドニア産サンゴ骨格を用いた過去500年間のエルニーニョ現象の復元

  渡邊剛  海外特別研究員報告書  2004  [Not refereed][Not invited]
  
• 造礁性サンゴDiploastrea属を用いた過去数百年間のエルニーニョ現象の復元

  渡邊剛  笹川科学研究助成研究報告書  2003  [Not refereed][Not invited]
  
• Seawater sampling for the measurements of helium-3 and tritium

  Watanabe, T, Hattori, H, Miura, T, Takahata, N, Sano, Y  Cruise report, Hakuho maru KH03-1  38頁  2003  [Not refereed][Not invited]
  
• 陸起源微量元素の海洋生物ポンプに果たす役割に関する研究、新世紀重点研究創生プラン（Research Revolution 2002, RR2002）、人・自然・地球共生プロジェクト諸物理過程のパラメタリゼーションの高度化

  佐野有司, 小畑 元, 高畑直人, 渡邊 剛  平成14年度研究成果報告書  106頁  -113頁  2003  [Not refereed][Not invited]
  
• Nutrients measurements

  Hattori, H, Watanabe, T  Cruise report, Hakuho maru KH03-1  38頁  2003  [Not refereed][Not invited]
  
• Doopvontschelp dient als paleothermometer, ed. Tom Van loon

  渡邊剛  NGV-Geonieuws elektronisch geologisch tijdschrift (Dutch)  83巻-  516頁  2003  [Not refereed][Not invited]
  
• サンゴ骨格を用いた西太平洋の過去500年間の気候復元

  渡邊剛  平成12年度科学研究費補助金（特別研究員奨励費）研究報告書  2002  [Not refereed][Not invited]
  
• Palaeoclimate Reconstruction using Diploastrea and Porites Corals from Alor in Eastern Indonesia.

  Watanabe, T, Gagan, M. K, Corrége, T, Hantoro, W. S, Gagan, H. S, Cowley, J, Mortimer, G. E, McCulloch, M. T  Proceeding of Convention of Indonesian Association of Geologists  1  -20  2002  [Not refereed][Not invited]
  
• サンゴが語る最近の地球環境

  渡邊剛  国立科学博物館ニュース  396-  11  -13  2002  [Not refereed][Not invited]
  
• シャコガイが記録する日単位の環境変動

  渡邊剛  地質ニュース  575巻-  (575)  42頁  -47頁  2002  [Not refereed][Not invited]
  
• Climatic Changes During the Little Ice Age in the Tropical Area Recorded in Coral Skeletons

  渡邊剛  日本海水学会誌  56巻-  (2)  118頁  -122頁  2002  [Not refereed][Not invited]
  
• Calibration Comparison and Warm Pool Palaeoclimate Reconstruction for Diploastrea heliopora and Porites Corals

  Watanabe, T, Gagan, M. K, Corrége, T, Hantoro, W. S, Gagan, H. S, Cabioch, G  Ann. Rep. Res School Earth Sci. ANU  2001  [Not refereed][Not invited]
  
• インドネシア産サンゴ骨格を用いた過去数百年のエルニーニョ現象の復元、食生活化学・文化及び地球環境科学に関する研究助成

  渡邊剛  財団法人アサヒビール学術振興財団研究紀要  16-  111  -116  2001  [Not refereed][Not invited]
  
• サンゴ骨格の酸素同位体比温度計

  鈴木 淳, 渡邊 剛, 川幡穂高  月刊地球  22巻-  (9号)  631頁  -637頁  2000  [Not refereed][Not invited]
  
• Stable isotopic compositions of the tufa-depositing streamwater

  MATSUOKA Jun, OBA Tadamichi, WATANABE Tsuyoshi, KANO Akihiro  Abst.105th Ann.Meet., Geol.Soc.Japan  106-  (0)  1999/10/05  [Not refereed][Not invited]
  
• カリブ海のサンゴ記録と海洋環境復元

  渡邊 剛, 石下洋志, 大場忠道  地質ニュース  527巻-  (527)  37頁  -42頁  1998  [Not refereed][Not invited]
  
• Comparisons using Oxygen and carbon isotopes from a Puerto Rican coral between 1980’s and Little ice age

  Oba, T, Ishioroshi, H, Watanabe, T  Proc. 3th Int. Marine Science Symp.  22頁  -28頁  1998  [Not refereed][Not invited]
  
• カリブ海プエルトリコの海水の酸素同位体比及び海水中の全炭酸の炭素同位体比＜カリブ海での過去数百年の気候変化とサンゴ礁周辺海域での生物・有機物分布

  渡邊 剛, ウィンター,アモス, 大場忠道  平成8年度科学研究費補助金（国際学術研究）研究成果報告書  80  -84  1997  [Not refereed][Not invited]
  
• 石垣島産現生シャコガイ殻の酸素・炭素同位体比

  渡邊 剛, 大場忠道  月刊地球  17巻-  (11号)  728頁  -730頁  1995  [Not refereed][Not invited]
  

Books etc

• 古生物学の百科事典

  日本古生物学会 (Joint work)
  丸善出版 2023/01 (ISBN: 9784621307588) xxiv, 754p, 図版 [8] p
• サンゴ礁科学研究―多分野異文化融合の拠点へ（月刊海洋号外）

  渡邊 剛 (Joint work)
  海洋出版 2023
• サンゴ礁科学研究―多分野異文化融合の拠点へ（Ⅲ）

  渡邊 剛 (Joint work)
  海洋出版 2022/09
• サンゴ礁科学研究―多分野異文化融合の拠点へ（Ⅱ）

  渡邊 剛 (Joint work)
  海洋出版 2022/08
• サンゴ礁科学研究―多分野異文化融合の拠点へ

  渡邊 剛 (Joint work)
  海洋出版 2022/07
• 喜界島海と陸の造礁サンゴ図鑑

  深見裕伸他編 (Others)
  喜界島サンゴ礁科学研究所 2022/07
• 人と海洋の共生をめざして〜150人のオピニオンX

  (Joint work)
  （公財）笹川平和財団 海洋政策研究所（共著） 2022/01
• サンゴ礁科学研究-Ⅳ ー喜界島サンゴ礁科学研究所設立記念号ー

  渡邊剛 (Joint work)
  海洋出版 2017/07
• サンゴ礁科学研究-Ⅲ ー喜界島サンゴ礁科学研究所設立記念号ー

  渡邊剛 (Joint work)
  海洋出版 2017/03
• サンゴ礁科学研究-Ⅱ ー喜界島サンゴ礁科学研究所設立記念号ー

  渡邊剛 (Joint work)
  海洋出版 2017/02
• サンゴ礁科学研究—喜界島サンゴ礁科学研究所設立記念特別号—

  渡邊剛 (Joint work)
  海洋出版 2016/05
• Coral Reef Science-Strategy for Ecosystem Symbiosis and Coexistence with Humans under Multiple Stresses

  Tsuyoshi Watanabe (Joint work)
  Springer Japan 2016
• Umibouzu Hunters-The story of a long-lived coral-

  Watanabe, T, Kogame, I, Yamazaki, A, Grove-Ogier, J 
  SOGO printing 2014
• うみぼうずハンターズーハマサンゴのものがたりー

  渡邊 剛, こがめいづる 
  手作り絵本工房ののか 2012/03
• 地球惑星科学入門

  在田 一則, 竹下 徹, 見延庄士郎, 渡部 重十編著 (Joint work2頁 第17章 Box17.1 安定同位体と地球科学)
  北海道大学出版会 2010/10
• 地球変動研究の最前線を訪ねる-人間と大気・生物・水・土壌の環境-

  小川利紘, 及川武久, 陽 捷行 (Joint work12頁)
  清水弘文堂書房 2010/02
• 地球と生命の進化学 新・自然史科学Ⅰ

  沢田健, 綿貫豊, 西弘嗣, 栃内新, 馬渡峻輔編著 (Joint work1頁 第11章 コラム・人類が影響を与える気候変動)
  北海道大学出版 2008/03
• Global Climate Change and Response of Carbon Cycle in the Equatorial Pacific and Indian Oceans and adjacent landmasses

  Watanabe, T, Juillet-Leclerc, A, Cuif, J.-P. Rollion-Bard, C, Dauphin, Y, Reynaud, S (Joint workRecent advances in coral biomineralization with implications for paleo-climatology: a brief overview)
  ELSEVIER 2006
• 地球と宇宙の化学事典

  南川雅男他編 (Joint work)
  朝倉書店

Presentations

• スーパーハイレゾリューション古海洋学  [Invited]

  渡邊 剛

  2024年度日本海洋学会秋季大会  2024/09
• ハワイ産現生サンゴ骨格を用いた水温変動と栄養塩変動の復元による、北太平洋亜熱帯循環域における過去100年間のローカルな水塊の動きの解明

  内山 遼平, 山崎 敦子, 野尻 太郎, 角皆 潤, 渡邊 剛

  日本地球惑星科学連合2024年大会  2024/05
• ハマグリの貝殻を用いた高解像度古環境解析:種子島の完新世の水温変動と生活環境への影響

  渡邊 剛, 藤田 寛之, 山崎 敦子, 駒越 太郎, 高宮 広土

  日本地球惑星科学連合2024年大会  2024/05
• Project MOANA: Migration to remote Oceania reconsideredfrom Atmospheric and Aquatic environments

  Atsuko Yamazaki, Takuya Shimomaki, Ryohei Uchiyama, Akira Goto, Tomo Ishimura, David Lecchini, Tsuyoshi Watanabe

  日本地球惑星科学連合2024年大会  2024/05
• ENSO-driven hydrological variability at 4.2 ka BP recorded by corals from Northern Luzon, Philippines

  Kevin Lariosa Garas, Tsuyoshi Watanabe, Atsuko Yamazaki, Yolanda Maac Aguilar, Tomoki Kase

  日本地球惑星科学連合2024年大会  2024/05
• サンゴ礁同位体地球環境学  [Invited]

  渡邊 剛

  第13回同位体環境学シンポジウム  2023/12
• 造礁サンゴ骨格の窒素同位体比指標

  山崎 敦子, 渡邊 剛

  第13回同位体環境学シンポジウム  2023/12
• 喜界島の化石シャコガイを用いた高時間解像度の古気象復元

  駒越 太郎, 渡邊 剛, 藤田 寛之, 内田 悠人, 山崎 敦子, 佐々木 圭一

  第13回同位体環境学シンポジウム  2023/12
• 完新世のサンゴ骨格を用いた東アジア古環境の復元：台湾宜蘭・琉球喜界島先史時代考古事実の解明

  馬 浩原, 渡邊 剛, Garas Kevin, 柳田 未来, 駒越 太郎, 山崎 敦子

  第13回同位体環境学シンポジウム  2023/12
• 種子島産ハマグリ属の安定同位体比・微細構造解析を用いた高時間解像度の古環境復元

  藤田 寛之, 渡邊 剛, 駒越 太郎, 山崎 敦子

  第13回同位体環境学シンポジウム  2023/12
• ハワイ産現生サンゴ骨格中の窒素同位体比から読み解く過去100年間の栄養塩循環

  内山 遼平, 山崎 敦子, 野尻 太郎, Samuel. E. Kahng, 渡邊 剛

  第13回同位体環境学シンポジウム  2023/12
• 喜界島塩道湾におけるハマサンゴ骨格の高解像度古環境解析を用いた1798-2015年の降水量の復元

  栗原 歩佳, 渡邊 剛, 小野寺 那智, 駒越 太郎, 伊藤 早織, 竹内 走, 山崎 敦子

  第13回同位体環境学シンポジウム  2023/12
• 喜界島におけるCCP解析から明らかになる現生ンゴ群集の礁形成能力

  岸 拓未, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会  2023/11
• 喜界島における化石シャコガイ殻を用いた完新世の高時間解像度の古環境復元

  駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第26回大会  2023/11
• 喜界島北東部における5万年前のサンゴ礁成長過程

  佐々木 圭一, 杉原 薫, 内田 真緒, 渡邉 貴昭, 沈 川洲, 渡邊 剛

  日本サンゴ礁学会第26回大会  2023/11
• 東日本大震災によって気仙沼から八丈島に辿り着いた漁船に付着していたサンゴ骨格の成長線解析から漂流軌跡を推定する

  渡邊 翔太朗, 山野 博哉, 北野 裕子, 牧 秀明, ノエ セバンバンスキ, サムエル カーン, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 喜界島の完新世のサンゴ礁の礁原の広がるスピードとサンゴの関係

  大林 想汰, 佐々木 圭一, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 喜界島のタイドプールに生息する枝状サンゴの枝分かれに対する流れの速さの影響

  尾山 心音, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 喜界島のサンゴ石垣を構成するサンゴの調査

  鴨谷 惟名世, 鈴木 倫太郎, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 喜界島におけるサンゴに付着する生物の環境による違い

  牧田 昊鷹, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• サンゴ礁の波の力を利用した発電方法の開発

  橋本 昊, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• ハマサンゴ属とキクメイシ属サンゴ骨格の浸食作用の受けやすさの比較

  都筑 暖和, 松田 博樹, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 偏光顕微鏡および電子顕微鏡を用いたアオサンゴとハマサンゴの骨格結晶の比較

  山村 杏, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本サンゴ礁学会第26回大会（小中高生ポスター発表）  2023/11
• 喜界島産現生アオサンゴ骨格を用いた酸素同位体比水温計の作成

  津田 和忠, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第26回大会（ポスター発表）  2023/11
• 高時空解像度の地球科学的手法と演劇の現象学的還元を用いたサンゴとヒトの記憶の包括的復原

  渡邊 剛, 山崎 敦子, 駒越 太郎, 小又 寛也, 中村 隆志, 宮崎 玲奈, 山下 恵実, SceNE, プロジェクトメンバー

  日本地球惑星科学連合2023年大会  2023/05
• 高時空間分解能のハインドキャストシミュレーションによる古環境プロキシの高精度キャリブレーション

  小又 寛也, 中村 隆志, 山崎 敦子, 駒越 太郎, 渡邊 剛

  日本地球惑星科学連合2023年大会  2023/05
• ハワイ産現生サンゴ骨格コアのSr/Ca比と窒素同位体比を用いた百年間の古環境復元

  内山 遼平, 山崎 敦子, 野尻 太郎, カン サミュエル, 角皆 潤, 渡邊 剛

  日本地球惑星科学連合2023年大会  2023/05
• 造礁サンゴ骨格の炭素同位体比による黒潮流域の人為起源二酸化炭素吸収量の復元

  山崎 敦子, 渡邊 剛

  日本地球惑星科学連合2023年大会  2023/05
• Coral skeletons; high-resolution memories of ocean currents and winds  [Invited]

  Watanabe, T, Yamazaki, A

  Proceedings of the Out of Eurasia Hawaii Conference  2023/03
• 珊瑚礁と万華鏡  [Invited]

  渡邊 剛

  シンポジウム「万華鏡の世界〜華と鏡と心の宇宙」  2022/11
• 「喜界島のサンゴ礁と身心変容」  [Invited]

  渡邊 剛

  第88回身心変容技法研究会（テーマ：「サンゴ礁世界と身心変容」）  2022/11
• サンゴの地球科学的アプローチと演劇の現象的還元手法を用いたサンゴと人の記憶の高精度化復元

  渡邊 剛, 山崎 敦子, 宮崎 玲奈, 山下 恵実, SceNeプロジェクトメンバー

  日本サンゴ礁学会第25回大会  2022/11
• 喜界島における地形;人間活動の異なる海岸ごとの砂中のマイクロプラスチックの特性

  山村 杏, 駒越 太郎, 山﨑 敦子, 渡邊 剛

  日本サンゴ礁学会第25回大会  2022/11
• 喜界島における現生サンゴの食べられやすさによる粘液量の違い

  富永 奏哉, 駒越 太郎, 山﨑 敦子, 渡邊 剛, 樋口 富彦, 岸 拓未

  日本サンゴ礁学会第25回大会  2022/11
• 喜界島のサンゴ礁の波を使った発電のための流速調査

  橋本 昊, 駒越 太郎, 山﨑 敦子, 渡邊 剛

  日本サンゴ礁学会第25回大会  2022/11
• 人の住む環境の水からサンゴの住む水への変化

  都筑 暖和, 駒越 太郎, 山﨑 敦子, 渡邊 剛, 松田 博貴, 内山 遼平

  日本サンゴ礁学会第25回大会  2022/11
• 喜界島のサンゴの色・蛍光・光合成は生息深度でどう変化するか

  牧田 昊鷹, 駒越 太郎, 山﨑 敦子, 渡邊 剛, 津田 和忠

  日本サンゴ礁学会第25回大会  2022/11
• X線CTを用いた喜界島の現生サンゴの石灰化量の算出

  尾山 心音, 駒越 太郎, 山﨑 敦子, 渡邊 剛, 岸 拓未

  日本サンゴ礁学会第25回大会  2022/11
• ミドリイシ属サンゴの群体内部位ごとの石灰化能力の比較

  渡邊 翔太朗, 駒越 太郎, 山﨑 敦子, 渡邊 剛

  日本サンゴ礁学会第25回大会  2022/11
• 喜界島におけるCCP解析から明らかになる現生サンゴ群集の礁形成能力

  岸 拓未, 渡邊 剛, 山崎 敦子, 駒越 太郎

  日本サンゴ礁学会第25回大会  2022/11
• Growth and calcification rates in the lower photic zone. What are the implications?

  サミュエル カン, 岸 拓未, 内山 遼平, 渡邊 剛

  日本サンゴ礁学会第25回大会  2022/11
• 種子島産化石ハマグリ殻の安定同位体比・微細構造解析を用いた縄文後期の古環境復元へのアプローチ

  藤田 寛之, 渡邊 剛, 駒越 太郎, 山崎 敦子

  日本サンゴ礁学会第25回大会  2022/11
• サンゴ骨格の窒素同位体比から推定する低緯度域の窒素の起源

  山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第25回大会  2022/11
• サンゴロジー  [Invited]

  渡邊 剛

  日本地質学会129年学術大会  2022/09
• サンゴ礁は楽園か？過去、現在、未来のヒトと自然の関係  [Invited]

  渡邊 剛

  楽園学会  2022/07
• The response of coral reef development to climate conditions on Holocene uplifted terraces in Kikai Island, Japan  [Not invited]

  Yamazaki, A, Kobayashi, W, Garas, K, Watanabe, T

  ICRS 2022 - 15th International Coral Reef Symposium  2022/07
• Coral records support upwelling in the Arabian Sea is weakening during the current warming era  [Not invited]

  Watanabe, T. K, Watanabe, T, Pfeiffer, M, Hu, H.-M, Shen, C.-C, Yamazaki, A

  ICRS 2022 - 15th International Coral Reef Symposium  2022/07
• Reconstruction of anthropogenic CO2 uptake in the NW Pacific over the last 100 years  [Not invited]

  Watanabe, T, Yamazaki, A, CREES member

  ICRS 2022 - 15th International Coral Reef Symposium  2022/07
• サンゴ骨格の炭素同位体比と形態解析から解明する北太平洋における人為起源二酸化炭素の海洋吸収量の変動

  小山 都熙, 渡邊 剛, 野尻 太郎, Samuel Kahng, 山崎 敦子

  日本地球惑星科学連合2022年大会  2022/05
• 喜界島塩道湾における水文学的特徴の解明ならびにハマサンゴ骨格の高解像度古環境解析から復元した1798年から2015年の月降水量変動

  小野寺 那智, 渡邊 剛, 伊藤 早織, 竹内 走, 駒越 太郎, 山崎 敦子

  日本地球惑星科学連合2022年大会  2022/05
• サンゴと人と環境変動適応~サンゴ生態系に学ぶ世界との関わり方~  [Invited]

  渡邊 剛

  あいだの生態系研究所 vol.10（オンライン開催）  2022/05
• ハワイのサンゴ骨格に記録された人為起源二酸化炭素の海洋吸収量の変動

  小山 都熙, 渡邊 剛, 野尻 太郎, サミュエル カン, 山崎 敦子

  日本サンゴ礁学会第24回大会  2021/11
• 喜界島のサンゴ骨格のδ18OとSr/Ca指標から復元した20世紀の降水量変動

  小野寺 那智, 渡邊 剛, 山崎 敦子

  日本サンゴ礁学会第24回大会  2021/11
• ハワイ産サンゴ骨格中Sr/Ca比の水温指標としての可能性

  内山 遼平, 渡邊 剛, サミュエル カン, 山崎 敦子

  日本サンゴ礁学会第24回大会  2021/11
• Latitudinal variation of the geochemical composition and calcification rate in Plesiastrea versipora along Japanese coast

  Koyama. T, Watanabe. T, Nakaya. R, Sugihara. K, Yamazaki. A

  ICRS 2021 - 14th International Coral Reef Symposium  2021/07
• Examination of reconstructing past sea surface temperature using skeletal Sr/Ca ratio in modern Porites skeletons at Oahu, Hawaii

  Uchiyama. R, Watanabe. T, Nojiri. T, Watanabe. T.K, Kahng. S, Yamazaki. A

  ICRS 2021 - 14th International Coral Reef Symposium  2021/07
• Coral skeletal records reveal the relationship between Kuroshio variability and North Pacific climate

  山崎 敦子, 渡邊 剛

  日本地球惑星科学連合2021年大会  2021/06
• オアフ島産現生サンゴ骨格中Sr/Ca比を用いた水温復元―数十年規模での貿易風との関わりー

  内山 遼平, 渡邊 剛, 野尻 太郎, 渡邉 貴昭, サミュエル カン, 山崎 敦子

  日本地球惑星科学連合2021年大会  2021/06
• Hydroclimate seasonality during mid- to late Holocene transition: Evidence of East Asian Monsoon dynamics from fossil corals

  Garas. K, Watanabe. T, Yamazaki. Y, Komagoe. T

  日本地球惑星科学連合2021年大会  2021/06
• Coral Sclerochronology: High-temporal resolution windows for Palaeoclimatology, Palaeocenography, and Palaeoecology

  渡邊 剛

  日本地球惑星科学連合2021年大会  2021/06
• 薩摩硫黄島の熱水活動がハマサンゴ骨格の微細構造と微量元素濃度に与える影響

  杉山 夏希, 山崎 敦子, 清川 昌一, 渡邊 剛

  日本サンゴ礁学会第23回大会  2020/11
• 喜界島のサンゴ骨格のδ18OとSr/Ca指標から復元した20世紀の降水量変動

  小野寺 那智, 渡邊 剛, 山崎 敦子

  日本サンゴ礁学会第23回大会  2020/11
• ハワイオアフ島の現生サンゴ骨格中微量元素分析による、過去70年間の水温変動の復元  [Not invited]

  内山 遼平, 渡邊 剛, 野尻 太郎, 渡邉 貴昭, Samuel. E. Kahng, 山崎 敦子

  日本サンゴ礁学会第23回大会  2020/11
• UAV画像解析とアミノ酸年代測定法を用いた手法の簡便化による喜界島完新世サンゴ礁段丘の高解像度形成史へのアプローチ

  小田嶋 元哉, 渡邊 剛, 山崎 敦子, 駒越 太郎

  日本サンゴ礁学会第23回大会  2020/11
• 地球規模の環境変動と地域カタストロフィック事変が社会の脆弱性に与える影響：サンゴ礁をフィールドにした文理融合、地域密着型の地球環境学への誘い

  渡邊 剛, 山崎 敦子

  日本サンゴ礁学会第23回大会  2020/11
• 北限域のハマサンゴ骨格の酸素同位体比から解明する1930年代以降の黒潮流路の変遷

  山崎 敦子, 渡邊 剛, 井笹 純平, 阿部 理, 野村 恵一

  日本サンゴ礁学会第23回大会  2020/11
• Effects of ocean acidification on coral endolithic microbial communities in Isopora palifera and Porites lobata

  Garas. K, Watanabe. T, Yamazaki. A, Kase. T, Maac-Aguilar. Y, De la Cruz, L. G

  日本サンゴ礁学会第23回大会  2020/11
• 鹿児島県喜界島のタイドプール内における炭酸系とサンゴの分布

  津田 和忠, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第23回大会  2020/11
• ハマサンゴ属の化石骨格内部に保存される形態を用いた種同定の検討

  日吉 慎太郎, 北野 裕子, Samuel Kahng, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第23回大会  2020/11
• 日本沿岸に生息する造礁サンゴの緯度勾配下における地球化学的特徴と骨格形成変化

  小山 都熙, 渡邊 剛, 中谷 理愛, 杉原 薫, 山野 博哉, 山崎 敦子

  日本サンゴ礁学会第23回大会  2020/11
• MIRAIプロジェクト：サンゴ礁が誘う文理融合型地球環境学

  渡邉 剛

  日本サンゴ礁学会第23回大会 自由集会  2020/11
• 喜界島ハワイ礁池および奄美大島大浜礁池における過去4年度分の教育活動に伴うサンゴ被度調査の成果と傾向  [Not invited]

  藤井 琢磨, 興 克樹, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第22回大会  2019/11
• サンゴ骨格に記録された人為起源二酸化炭素の北大西洋域への吸収量の変動史  [Not invited]

  渡邊 剛, 山崎 敦子, 伊藤 早織, 井笹 純平, 河村 卓, 大森 和博, 野尻 太郎, 内山 遼平, Samuel E. Kahng, 野村 恵一, 岩瀬 文人, 山野 博哉

  日本サンゴ礁学会第22回大会  2019/11
• 光条件がサンゴ骨格のBa/Ca比に与える影響  [Not invited]

  山崎 敦子, 矢野 恵美, 波利井 佐紀, 渡邊 剛

  日本サンゴ礁学会第22回大会  2019/11
• 喜界島産化石シャコガイ殻を用いた後期更新世MIS3の台風の復元  [Not invited]

  駒越 太郎, 渡邊 剛, 佐々木 圭一, 白井 厚太朗, 山崎 敦子

  日本サンゴ礁学会第22回大会  2019/11
• ハワイオアフ島の現生サンゴ骨格を用いたSr/Ca比と水温のキャリブレーション  [Not invited]

  内山 遼平, 渡邊 剛, 野尻 太郎, 渡邉 貴昭, Samuel E. Kahng, 山崎 敦子

  日本サンゴ礁学会第22回大会  2019/11
• 台湾緑島ハマサンゴに記録された1997/98年白化イベント；サンゴと渦鞭毛藻の共生系におけるレジームシフト  [Not invited]

  池田 昌隆, 渡邊 剛, 渡邉 貴昭, 山崎 敦子, 大森 一人, Chiang Hong Wei, Chuan-Chou Shen

  日本サンゴ礁学会第22回大会  2019/11
• Corals reveal intermispheric ITCZ migration over the last 7,000 years  [Not invited]

  Garas, K, Watanabe, T, Yamazaki, A

  日本サンゴ礁学会第22回大会  2019/11
• フィリピン産化石サンゴに記録された鮮新世温暖期のエルニーニョ南方振動  [Not invited]

  加山 新, 渡邊 剛, 山崎 敦子, 加瀬 友喜

  日本サンゴ礁学会第22回大会  2019/11
• 日本周辺海域におけるPlesiastrea属の緯度勾配による骨格形成変化と地球化学的特徴  [Not invited]

  小山 都煕, 渡邊 剛, 中谷 理愛, 杉原 薫, 山崎 敦子

  日本サンゴ礁学会第22回大会  2019/11
• 鹿児島県喜界島のハワイビーチと小野津港の海水の炭酸系とサンゴの分布  [Not invited]

  津田 和忠, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第22回大会  2019/11
• ハマサンゴ属の骨格切断面の形態は種同定に使えるのか  [Not invited]

  日吉 慎太郎, 北野 裕子, 駒越 太郎, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第22回大会  2019/11
• サンゴが記憶する地球環境変動  [Invited]

  渡邊剛

  日本サンゴ礁学会第22回大会公開シンポジウム  2019/11
• サンゴが語る喜界島の記憶  [Invited]

  渡邊剛

  島嶼研シンポジウム「新たな技術で喜界島の未来を考える」  2019/10
• サンゴって何がすごいの？いつからあるの？〜私達を取り囲むサンゴを知ろう〜  [Invited]

  渡邊剛

  令和元年度いせん寺子屋  2019/10
• Coral geochemical records: a key for understanding seasonal to century scale climate variability in North Pacific  [Invited]

  Watanabe, T, Yamazaki, A

  Oceanography Seminar  2019/09
• Coral evidences of robust interannual variability and environmental conditions during Pliocene warm period  [Not invited]

  Tsuyoshi Watanabe

  PaleoENSO workshop  2019/08
• 浮き続ける島と沈み続ける島のサンゴ礁：それぞれの過去-現在-未来  [Invited]

  渡邊剛

  喜界島サンゴ礁科学シンポジウム2019  2019/08
• Coral Sclerochronology: High-temporal resolution windows for palaeoclimatology, paleoceanography, and paleoecology  [Invited]

  Tsuyoshi Watanabe

  Special Lecture  2019/07
• A 150 years Margritifera shell record reveals that summer air temperature in northern Japan is linked to Atlantic Multidecadal Oscillation  [Not invited]

  Tsuyoshi Watanabe

  5th International Sclerochronology Conference  2019/06
• 喜界島サンゴ礁科学研究所 ―フィールドに根ざしたサンゴ礁研究拠点形成と次世代リーダーの育成―  [Not invited]

  渡邊 剛, 山崎 敦子, 駒越 太郎, 伊藤 早織

  日本サンゴ礁学会第21回大会  2018/11
• インドネシアジャワ島産の化石シャコガイに記録された後期中新世の気候  [Not invited]

  駒越 太郎, 渡邊 剛, 白井 厚太朗, Hita Pandita, 栗原 行人, 加瀬 友喜

  日本サンゴ礁学会第21回大会  2018/11
• 奄美群島産サンゴ骨格に記録された生息環境の撹乱と石灰化応答〜土砂流出・津波イベント〜  [Not invited]

  伊藤 早織, 矢野 恵, 渡邉 貴昭, 山崎 敦子, 渡邊 剛

  日本サンゴ礁学会第21回大会  2018/11
• 喜界島隆起サンゴ礁における完新世のサンゴ群集及び炭酸塩生産量の変遷  [Not invited]

  山崎 敦子, 小林 航, Kevin Garas, 渡邊 剛

  日本サンゴ礁学会第21回大会  2018/11
• 高pCO2および富栄養環境におけるPorites compressaの成長応答と微細骨格構造の変化  [Not invited]

  板井 慎太郎, 駒越 太郎, 山崎 敦子, 渡邉 貴昭, 小林 唯, Samuel Kahng, 渡邊 剛

  日本サンゴ礁学会第21回大会  2018/11
• ベトナムコンダオ島の高時間解像度サンゴ骨格記録：メコン川の流出量および洪水イベントに対する東アジアモンスーンの影響  [Not invited]

  Phan Tung, 渡邊 剛, 山崎 敦子, Shen Chuan-Chou

  日本地質学会2018札幌大会  2018/09
• 喜界島サンゴ化石に記録された中期・後期完新世移行期における東アジアモンスーンの季節変動の復元  [Not invited]

  Garas Kevin, 渡邊 剛, 山崎 敦子

  日本地質学会2018札幌大会  2018/09
• 生物源炭酸塩骨格に刻まれる地球環境変動  [Invited]

  渡邊剛

  日本地質学会2018札幌大会  2018/09
• Coral records reveal that abrupt intensification in winter monsoon was the direct trigger of the Akkad empire collapse in 4 ka.  [Not invited]

  Watanabe, T. K, Watanabe, T, Yamazaki, A, Pfeiffer, M

  5th Young Reef Scientists Meeting  2018/09
• 人工飼育造礁サンゴの微細組織観察  [Not invited]

  甕 聡子, 富岡 尚敬, 兒玉優, 川野 潤, 波利井 佐紀, 永井 隆哉, 渡邊 剛, 伊藤 元雄

  日本鉱物科学会2018年  2018/09
• 喜界島サンゴが語る過去216年の歴史と気候変動  [Not invited]

  渡邊剛

  喜界島サンゴ礁科学シンポジウム2018  2018/08
• The impact enormous volcanic eruptions, tsunamis and the Little Ice Age had on the AinuⅡ  [Not invited]

  Soeda, Y, Sugiyama, S, Nakamura, K, Miyaji, T, Watanabe, T, Khono, N, Aono,T

  日本文化財学会第34回大会  2018/07
• Geochemical Approaches to Evaluate Environmental Changes on Mesophotic Corals  [Invited]

  Tsuyoshi Watanabe

  Gordon Research Conference  2018/06
• Fast zooxanthellate coral growth rate at mesophotic depths  [Invited]

  Kahng, S, Watanabe, T, Hsun-Ming Hu, Watanabe, T.K, Chuan-Chou Shen

  Gordon Research Conference  2018/06
• Survival strategy of mesophotic Porites corals inferred from sclerochronology and geochemistry  [Invited]

  Yamazaki, A, Watanabe, T, Watanabe, T.K, Sinniger, F, Tsunogai, U, Harii, S

  Gordon Research Conference  2018/06
• Geochemistry of deep sea corals in Hawaii  [Not invited]

  Kahng, S, Watanabe, T, Shen, C-C, Duenas, L, Parrish, F

  Deep Sea Coral Research and Technology Program: Pacific Islands Deep-Sea Coral and Sponge 3-Year Research Wrap-Up Workshop  2018/05
• Variation in coral calcifying fluid pH across coral habitable latitude  [Not invited]

  Tanaka, K, Holcomb, M, Watanabe, T, MuCulloch, M

  JpGU 2018  2018/05
• Coral calcification in temperate region and the role of dissolved inorganic carbon(DIC) and pH in the calcifying fluid  [Not invited]

  Sowa, K, Tanaka, K, Watanabe, T, Zinke, J, Nomura, K, MuCulloch, M

  JpGU 2018  2018/05
• Global-warming hiatus triggered the inactive Indian Ocean Dipole  [Not invited]

  Watanabe, T.K, Watanabe, T, Yamazaki, A, Pfeiffer, M, Claereboudt, M

  EGU General Assembly 2018  2018/04
• Late Pleistocene MIS 3 high temporal resolution climate reconstruction using giant clam fossils in Kikai Island, Japan  [Not invited]

  Komagoe, T, Watanabe, T, Sasaki, K, Shirai, K, Yamazaki, A

  EGU General Assembly 2018  2018/04
• The geochemical records of Porites corals from Con Dao island, Southern Viet Nam as an indicator of Mekong river discharge and East Asian monsoon  [Not invited]

  Phan, T, Yamazaki, A, Shen, C.-C, Watanabe, T

  EGU General Assembly 2018  2018/04
• Coral sclerochronology and geochemistry in mesophotic corals: environmental or physiological changes?  [Not invited]

  Yamazaki, A, Yoneta, S, Watanabe, T.K, Sinniger, F, Harii, S, Tsunogai, U, Watanabe, T

  EGU General Assembly 2018  2018/04
• Long-term quantitative assessment of the influence of sediment-related reef disturbance on coral calcification using skeletal geochemical proxies and skeletal growth parameters, in Sumiyo Bay, Amami Oshima  [Not invited]

  Ito, S, Watanabe, T, Yano, M, Watanabe, T.K, Yamazaki, A

  EGU General Assembly 2018  2018/04
• Coral records reveal that abrupt intensification in winter monsoon was the direct trigger of the Akkad empire collapse in 4 ka  [Not invited]

  Watanabe, T.K, Watanabe, T, Yamazaki, A, Pfeiffer, M, Garbe-Schönberg, D, Claereboudt, M. R

  EGU General Assembly 2018  2018/04
• East China Sea oceanographic response to East Asian Monsoon: Insights from seasonal Sr/Ca and δ18O coral records from Mid-Late Holocene (Kikai Is, Japan)  [Not invited]

  Garas, K, Watanabe, T, Yamazaki, A

  EGU General Assembly 2018  2018/04
• Coral Sr/Ca records from Enggano Island (Indonesia): Proxy records of IOD-induced upwelling and mean SST in the Eastern Indian Ocean  [Not invited]

  Pfeiffer, M, Takayanagi, H, Sri Yudawati Cahyarini, Watanabe, T, Garbe- Schönberg, D, Reuning, L

  EGU General Assembly 2018  2018/04
• Kuroshio meander recorded in coral oxygen isotopes  [Not invited]

  Yamazaki, A, Isasa, J, Nomura, K, Watanabe, T

  EGU General Assembly 2018  2018/04
• Coral records for anthropogenic CO2 uptake in the NW Pacific over the last 100 years  [Not invited]

  Watanabe, T, Yamazaki, A, Kawamura, T, Isasa, J, Ito, S, Yoneta, S, Sugihara, K, Nomura, K, Iwase, F, Yamano, H

  EGU General Assembly 2018  2018/04
• Pliocene El Nino: Coral records from Philippines could tell us the future image of El Nino?  [Invited]

  Tsuyoshi Watanabe

  NIGS lecture series “Coral Reefs Environmental Earth Sciences  2018/02
• Transition of coral community and CCP on Holocene raised reef in Kikai island, Ryukyu islands, Japan  [Invited]

  Kobayashi, W. Yamazaki, A, Watanabe, T

  NIGS lecture series “Coral Reefs Environmental Earth Sciences  2018/02
• Coral records reveal that abrupt intensification in winter monsoon was the direct trigger of the Akkad empire collapse in 4 ka  [Invited]

  Watanabe, T. K, Watanabe, T, Yamazaki, A, Pfeiffer, M

  NIGS lecture series “Coral Reefs Environmental Earth Sciences  2018/02
• Reef disturbance archives in skeletal geochemical proxies and the responses on skeletal calcification: Earthquake and tsunami events, Coral Reefs Environmental Earth Sciences: Introduction to Coralogy and its Various Applications  [Invited]

  Ito, S, Yamazaki, A, Yano, M, Watanabe, T. K, Putra, T. E, Nishimura, Y, Watanabe, T

  NIGS lecture series “Coral Reefs Environmental Earth Sciences  2018/02
• 温帯塊状ハマサンゴの石灰化部位における炭酸系・pHの動態解明  [Not invited]

  岨 康輝, 田中 健太郎, 渡邊 剛, Jens Zinke, 野村 恵一, Malcolm McCulloch

  日本サンゴ礁学会第20回大会  2017/11
• The mineralogical features of aposymbiotic coral skeletons cultured in seawater varied Mg/Ca molar ratios  [Not invited]

  Motai, S, Kawano, J, Harii, S, Watanabe, T, Nagai, T

  14th International Symposium on biomineralization  2017/10
• Effect of ocean acidification on carbonate chemistry in coral calcifying fluid  [Not invited]

  Tanaka, K, Holcomb, M, Takahashi, A, Kurihara, H, Asami, R, Shinjo, R, Watanabe, T, MuCulloch, M

  14th International Symposium on biomineralization  2017/10
• Collecting and sharing coral cores for international collaborative research  [Not invited]

  Tsuyoshi Watanabe

  GeoBremen 2017 Workshop on "Tropical coral archives"  2017/09
• Tropical to temperate coral archives around Japan  [Not invited]

  Watanabe, T, Yamazaki, A

  GeoBremen 2017  2017/09
• Change in nitrogen fixation derived from Caribbean coral skeletons  [Not invited]

  Yamazaki, A, Hetzinger, S, J. von Reumont, Manfrino, C, Tsunogai, U, Watanabe, T

  Geobremen 2017  2017/09
• 造礁サンゴ骨格の窒素同位体比指標 -低緯度域の栄養塩動態の解明に向けて-  [Invited]

  山崎 敦子, 渡邊 剛

  日本地球化学会年会第64回年会  2017/09
• 沖縄県瀬底島のメソフォティックゾーンに生息するハマサンゴの骨格に記録される成長履歴と古水温指標変化  [Not invited]

  米田 しおり, 山崎 敦子, 渡邉 貴昭, Frederic Sinniger, 波利井 佐紀, 渡邊 剛

  日本地球化学会第64回年会  2017/09
• Influence of symbiotic algae and Mg/Ca molar ratio in seawater on biomineralization of scleractinian coral skeleton  [Not invited]

  甕 聡子, 川野 潤, 波利井 佐紀, 兒玉優, 富岡 尚敬, 伊藤 元雄, 渡邊 剛, 永井 隆哉

  日本鉱物科学会2017年会  2017/09
• Indian monsoon reconstruction using fossil coral skeletons from Oman  [Not invited]

  Watanabe, T. K, Yamazaki, A, Pfeiffer, M, Shen, C.-C, Watanabe, T

  GeoBremen 2017  2017/09
• Earthquake and tsunami archives in coral growth parameters and geochemical records  [Not invited]

  Ito, S, Yamazaki, A, Yano, M, Watanabe, T. K, Putra, T. E, Nishimura, Y, Watanabe, T

  Geobremen 2017  2017/09
• Coral reefs in subsiding Hawaiʻi and uplifting Kikai islands  [Invited]

  Tsuyoshi Watanabe

  KIKAI international symposium for coral reef sciences 2017  2017/08
• Coral barium/calcium record of sediment load in Sumiyo Bay, Amami Oshima  [Not invited]

  Ito, S, Yano, M, Watanabe, T. K, Watanabe, T

  KIKAI international symposium for coral reef science 2017  2017/08
• Indian Monsoon evolution during the last millennium  [Not invited]

  Watanabe, T. K, Yamazaki, A, Pfeiffer, M, Shen, C.-C, Watanabe, T

  KIKAI international symposium for coral reef science 2017  2017/08
• High-resolution climate reconstruction using coral skeletons from GreenIsland in Taiwan -Sea surface temperature calibaration-  [Not invited]

  Ikeda, M, Watanabe, T, Omori, K, Watanabe, T. K, Yamazaki, A, HougWei, C, Shen, C.-C

  KIKAI international symposium for coral reef sciences 2017  2017/08
• East Asian monsoon variability recorded by Porites coral in Con Dao island, Southern of Viet Nam  [Not invited]

  Phan Thanh Tung, Watanabe. T, Yamazaki. A, Watanabe. T. K, Shen. C.-C, Chiang Hong-Wei

  KIKAI international symposium for coral reef sciences 2017  2017/08
• The impact enormous volcanic eruptions, tsunamis and the Little Ice Age had on the AinuI - Preliminary survey report at the Kamuitapukopushita site of Usu in Date City, Hokkaido-  [Not invited]

  添田 雄二, 青野 友哉, 永谷 幸人, 渋谷 綾子, 中村 賢太郎, 菅野 修広, 松田 宏介, 三谷 智広, 宮地 鼓, 渡邊 剛, 甲能 直樹

  日本文化財科学会第34回大会  2017/06
• Coral barium/calcium record of sediment load in Sumiyo Bay, Amami Oshima during heavy rainfall events  [Not invited]

  Ito, S, Yano, M, Watanabe, T. K, Watanabe, T

  JpGU-AGU joint meeting 2017  2017/05
• 17世紀の小氷期最寒冷期と巨大噴火・津波がアイヌ民族に与えた影響—北海道伊達市カムイタプコプ下遺跡2016年度調査報告—  [Not invited]

  渋谷 綾子, 添田 雄二, 青野 友哉, 永谷 幸人, 中村 賢太郎, 菅野 修広, 松田 宏介, 三谷 智広, 宮地 鼓, 渡邊 剛, 甲能 直樹

  考古学研究会63回総会・研究集会  2017/04
• サンゴからなる津波石の骨格調査に基づく南西諸島周辺の津波履歴の解明  [Not invited]

  渡邊 剛, 西村 裕一, 伊藤 早織, 山崎 敦子

  災害の軽減に貢献するための地震火山観測研究計画平成28年度成果報告シンポジウム  2017/03
• Influences of symbiotic algae on skeletal mineral phases of scleractinian coral cultured with different Mg/Ca molar ratio  [Not invited]

  甕 聡子, 川野 潤, 波利井 佐紀, 渡邊 剛, 永井 隆哉

  炭酸塩コロキウム2017  2017/03
• Coral Sclerochronology: High-temporal resolution windows for palaeoclimatology, paleoceanography, and paleoecology  [Invited]

  Tsuyoshi Watanabe

  2017/01
• ハワイに生息するPorites evermanniの骨格成長に適した水温の復元  [Not invited]

  野尻 太郎, 渡邊 剛, 山崎 敦子, Samuel E. Kahng

  日本サンゴ礁学会第19回大会  2016/12
• 20世紀のカリブ海の窒素固定量の変遷  [Not invited]

  山崎 敦子, Steffen Hetzinger, Jonas von Reumont, Carrie Manfrino, 角皆 潤, 佐野 有司, 渡邊 剛

  日本サンゴ礁学会第19回大会  2016/12
• 喜界島化石シャコガイから読み解く更新世—完新世の気候変動  [Not invited]

  駒越 太郎, 渡邊 剛, 佐々木 圭一, 白井 厚太朗, 山崎 敦子

  日本サンゴ礁学会第19回大会  2016/12
• High-Resolution Reconstruction of Palaeoclimates in tropical sea surface using Stable Isotopes and Trace Elements in Biogenic Carbonates  [Invited]

  Tsuyoshi Watanabe

  2016/09
• 薩摩硫黄島の火山性酸性下での過去100年のサンゴの成長応答と未来予測  [Not invited]

  渡邊剛

  喜界島サンゴ礁化学シンポジウム2016  2016/08
• サンゴロジー：サンゴ礁地球環境学  [Invited]

  渡邊剛

  喜界島サンゴ礁化学シンポジウム2016  2016/08
• Analysis of Hawaiian paleoenvironment from 1908 to 2015 using Porites evermanni  [Not invited]

  Nojiri, T, Watanabe, T, Yamazaki, A, Kahng, S. E

  喜界島サンゴ礁科学シンポジウム2016  2016/08
• 造礁サンゴと巨大地震 －サンゴ骨格の成長パラメータ分析と地球化学分析から読み解くスマトラ島沖地震の影響－  [Not invited]

  伊藤 早織, 渡邊 剛, 山崎 敦子, Teddy Eka PUTRA, 西村 裕一

  喜界島サンゴ礁科学シンポジウム2016  2016/08
• 造礁サンゴ骨格の窒素同位体比から復元された過去150 年間の黒潮流量の変動  [Not invited]

  山崎 敦子, 渡邊 剛, 角皆 潤, 岩瀬 文人, 山野 博哉

  喜界島サンゴ礁科学シンポジウム2016  2016/08
• シャコガイ殻を用いた高時間解像度の環境解析－沖ノ鳥島シラナミガイ殻に刻まれた台風の痕跡－  [Not invited]

  駒越 太郎, 渡邊 剛, 白井 厚太朗, 山崎 敦子, 植松 光夫

  喜界島サンゴ礁科学シンポジウム2016  2016/08
• オマーン産サンゴ骨格を用いた環境復元  [Not invited]

  渡邉 貴昭, 渡邊 剛, 山崎 敦子, Miriam Pfeiffer, Michel R Claereboudt

  喜界島サンゴ礁科学シンポジウム2016  2016/08
• カワシンジュガイの生態学的および地球化学的手法を用いた過去100年間の河川自然環境復元と人の生活様式への影響  [Invited]

  渡邊 剛, 鈴木 まゆみ, 山崎 敦子

  北海道河川財団研究助成成果報告会  2016/07
• カワシンジュガイ殻を用いた北海道の河川系における自然環境評価手法の高精度化  [Invited]

  渡邊剛

  2016/07
• Geochemical study on precious coral skeletons: Effects of biomineralization and environmental variation  [Not invited]

  Tanaka, K, Takahata, N, Shirai, K, Watanabe, T, Kahng S. E, Sano, Y

  Goldschmidt Conference  2016/06
• A 100 years’ coral growth history in volcanically acidified environments: analogues for coral acclimation to future ocean acidification  [Not invited]

  Watanabe, T, Kamimura, K, Sekiya, S, Yamazaki, A, Omori, K, LE Guern, F, Kiyokawa, S

  13th International Coral Reef Symposium  2016/06
• The potential for Sumatra earthquakes and tsunami reconstruction using Porites coral skeletons from Simeulue Island, Indonesia  [Not invited]

  Ito, S, Watanabe, T, Yamazaki, A, Putra, T. E

  13th International Coral Reef Symposium  2016/06
• Growth history recorded in skeletal stable isotopes in the mesophotic Porites coral from the Gulf of Eilat, Red Sea  [Not invited]

  Watanabe, T.K, Watanabe, T, Eyal, G, Loya, Y

  13th International Coral Reef Symposium  2016/06
• Variation of kuroshio transport during 1860-2007 ad inferred from coral nitrogen isotope signature  [Not invited]

  Yamazaki, A, Watanabe, T, Tsunogai, U, Iwase, F, Yamano, H

  13th International Coral Reef Symposium  2016/06
• オマーン周辺海域のサンゴ骨格に記録されたインド洋ダイポール現象  [Not invited]

  渡邉 貴昭, 渡邊 剛, 山崎 敦子, Pfeiffer,M, Garbe-Schonberg,D, Claereboudt,M

  日本古生物学会年会・総会  2016/06
• Pliocene El Niño; The analogue for future global warmth, Department of Geosciences  [Invited]

  Tsuyoshi Watanabe

  2016/03
• Growth characteristics and environmental changes deduced by geochemical approaches on mesophotic Porites corals collected from Okinawa, Japan  [Invited]

  Tsuyoshi Watanabe, Atsuko Yamazaki

  2016/03
• サンゴはどのような環境情報を記録しているのか？  [Invited]

  渡邊剛

  2016/03
• Environmental changes and coral growth histories during last 100 years recorded in mid-latitude massive Porites corals  [Not invited]

  Watanabe, T, Yamazaki, A, Kawamura, T, Isasa, J, Kamimura, K, Ohmori, K, Miyaji, T, Sekiya, S, Sowa, K, Nakamura, T, Ito, S, Nakaya, R, Kajita, H, Iwase, F, Nomura, K, Sugihara, K, Abe, O, Sakamoto, T, Murayama, M, Yamano, H

  International Coral Reef Science Symposium  2015/08
• Coral growth characteristics and marine environments during Pliocene warm period  [Not invited]

  Watanabe, T, Yamazaki, A, Omori, K, Suzuki, A, Kase, T

  International Coral Reef Science Symposium  2015/08
• Reconstruction of Sumatra earthquakes using skeletal growth rate and stable isotopes in Porites corals from Simeulue Island  [Not invited]

  Ito, S, Watanabe, T, Yamazaki, A, Teddy Eka Putra, Nishimura, Y

  International Coral Reef Science Symposium  2015/08
• Holocene climate reconstruction using oxygen and carbon isotopes in coral skeletons collected from Kikai island, Japan  [Not invited]

  Kajita, H, Watanabe, T, Yamazaki, A

  International Coral Reef Science Symposium  2015/08
• Late-Miocene climate reconstruction from fossil Tridacna gigas in Java island, Indonesia  [Not invited]

  Komagoe, T, Watanabe, T, Shirai, K, Pandita, H, Kurihara, Y, Kase, T

  International Coral Reef Science Symposium  2015/08
• Change in Caribbean nitrogen fixation with 90 year global warming  [Not invited]

  Yamazaki, A, Heztinger, S, Reumont, J, Manfrino, C, Tsunogai, U, Sano, Y, Watanabe, T

  International Coral Reef Science Symposium  2015/08
• Climate reconstruction using sclerochronological and geochemical approaches of freshwater peal mussels in Hokkaido, Japan  [Not invited]

  Suzuki, M, Watanabe, T, Yamazaki, A, Miyaji, T, Ohmori, K, Shirai, K

  International Coral Reef Science Symposium  2015/08
• インドネシアジャワ島産の化石シャコガイに記された後期中新世の気候  [Not invited]

  駒越太郎, 渡邊剛, 白井厚太朗, Hita Pandita, 栗原行人, 加瀬友喜

  日本古生物学会年会・総会  2015/06
• Strong typhoon in 2005 record Tridacna maxima from Okinotori Island, Japan  [Not invited]

  Komagoe, T, Watanabe, T, Miyaji, T, Shirai, K, Yamazaki, A

  JpGU International Symposium 2015  2015/05
• Linkage between the declines in Porites coral skeletal growth and a land improvement project on Ishigaki Island, Japan  [Not invited]

  Sowa, K, Watanabe, T, Yamano, H, Hayashi, S

  Japan Geoscience Union Meeting  2015/05
• 現生および化石シャコガイ殻の同位体比・微量元素・成長縞に記録される高解像度環境情報  [Not invited]

  駒越太郎, 渡邊剛

  炭酸塩コロキウム2017  2015/03
• 生息北限域のサンゴ骨格中ホウ素同位体比と海水pHの比較  [Not invited]

  岨 康輝, 田中 健太郎, 渡邊 剛, Jens Zinke, 野村 恵一, Malcolm McCulloch

  2015年度高知大学海洋コア総合研究センター 共同利用, 共同研究成果発表会  2015/03
• 生息北限域のサンゴ骨格中のホウ素同位体比は海洋酸性化を記録しているのか？ – vital effectの影響評価-  [Not invited]

  岨 康輝, 田中 健太郎, 渡邊 剛, Jens Zinke, 野村 恵一, Malcolm McCulloch

  2014年度 古海洋, 古気候に関するシンポジウム  2015/01
• 喜界島のサンゴが語る地球環境変動  [Invited]

  渡邊 剛, 本郷 宙軌, 山崎 敦子

  第一回 サンゴ礁科学セミナー  2014/12
• オマーン周辺海域におけるサンゴ骨格を用いた高時間分解能古環境復元  [Not invited]

  渡邉 貴昭, 渡邊 剛, 山崎 敦子, Pfeiffer,M, Garbe-Schonberg,D, Claereboudt,M

  日本地球化学会年会第64回年会  2014/09
• 北海道伊達市有珠における小氷期最寒冷期の古環境-陸上および海洋環境、積雪量等の復元と人との関わり-  [Not invited]

  添田雄二, 渡邊剛, 宮地鼓, 上中央子, 杉山真二, 渋谷綾子, 青野友哉, 永谷幸人

  日本第四紀学会2014年大会  2014/09
• 壱岐サンゴによる236Uの日本海への供給史復元  [Not invited]

  野村知哉, 坂口綾, Peter Steier, 渡邉貴昭, 渡邊剛, 高橋嘉夫, 山野博哉

  日本地球化学会年会第64回年会  2014/09
• 北海道伊達市カムイタプコプ下遺跡から復元されたアイヌ文化期の古環境Ⅱ-調査速報-  [Not invited]

  添田雄二, 菅野修広, 青野友哉, 永谷幸人, 三谷智広, 中村賢太郎, 河畑敦史, 上中央子, 宮地 鼓, 渡邊 剛, 渋谷綾子, 伊達元成

  日本文化財科学会第31回奈良大会  2014/07
• Reconstruction of anthropogenic 236U input to the Japan Sea  [Not invited]

  Sakaguchi, A, Nomura,T, Steier,P, Watanabe, T, Sasaki, K, Takahashi, Y, Yamano,H

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• High-resolution isotopic records in Oman corals: Indian Monsoon climate reconstruction  [Not invited]

  Watanabe, T.K, Watanabe, T, Yamazaki A, Claereboudt,M, Garbe-Schonberg, D, Pfeiffer,M

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• Seasonal to decadal climate signals in skeletal growth and trace elements of the Pacific sclerosponges  [Not invited]

  Ohmori K, Watanabe, T

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• Strong typhoon in 2005 recorded in the shell growth lines and geochemical signals of Tridacna maxima from Okinotori island, Japan  [Not invited]

  Komagoe,T, Watanabe, T, Miyaji,T, Shirai, K, Yamazaki A

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• Multidecadal climate reconstruction using sclerochronological and geochemical approaches on freshwater peal mussels in Hokkaido, Japan  [Not invited]

  Suzuki, M, Watanabe, T, Yamazaki A, Miyaji,T, Ohmori K, ShiraI, K

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• Variation of the Kuroshio transport over the 20th century  [Not invited]

  Yamazaki A, Watanabe, T, Tsunogai, U, Iwase,F, Yamano,H

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• Coral evidence for winter PDO variability triggered by the East Asian summer monsoon during the last 100 years  [Not invited]

  Watanabe, T, Kawamura, T, Yamazaki A, Murayama, M, Yamano,H

  Asia Oceania Geosciences Society, 11th Annual Meeting  2014/07
• サンゴ骨格中のBa/Ca比変動に記録される石垣島の土地利用変遷  [Not invited]

  宮地鼓, 大森一人, 渡邊剛, 山野博哉

  日本古生物学会年会・総会  2014/06
• Corals at marine volcano of Satsuma iwo-jima: Implication for a new proxy of hydrothermal events and biological adaptati  [Not invited]

  Watanabe, T, Kamimura, K, Yamazaki A, Ohmori K, Le Guern F, Kiyokawa S

  Japan Geoscience Union Meeting 2014  2014/05
• Variation of North Atlantic nitrogen fixation in Caribbean coral skeletons  [Not invited]

  Yamazaki A, Hetzinger, S, Reumont, J., V, Manfrino, C, Tsunogai, U, Watanabe, T

  Japan Geoscience Union Meeting 2014  2014/05
• New evidence for halite co-precipitation during coral calcification  [Not invited]

  Motai, S, Nagai,T, Kawano, J, Watanabe, T

  Japan Geoscience Union Meeting 2014  2014/05
• 薩摩硫黄島のサンゴが語る過去から現在そして未来  [Invited]

  渡邊剛

  2014/03
• 沖ノ鳥島シラナミガイ殻に記録された2005年巨大台風の痕跡  [Not invited]

  Komagoe, T, Watanabe, T, Shirai, K

  Project A in Satsuma Iwo jima  2014/03
• Multidecadal climatate reconstruction using sclerochronological and geochemical approaches on freshwater peal mussels in Hokkaido, Japan  [Not invited]

  Suzuki,M, Watanabe, T, Yamazaki A, Miyaji,T, Ohmori K, Shirai,K

  International Joint workshop on coral reef environmental earth sciences  2014/03
• High-resolution isotopic records in Oman corals: Indian Monsoon climate reconstruction  [Not invited]

  Watanabe, T.K, Watanabe, T, Yamazaki, A, Claereboudt, M, Pfeiffer, M

  International Joint workshop on coral reef environmental earth sciences  2014/03
• Strong typhoon in 2005 recorded in the shell growth lines and geochemical signals of Tridacna maxima from Okinotori island, Japan  [Not invited]

  Komagoe,T, Watanabe, T, Miyaji,T, Shirai,K, Yamazaki A

  International Joint workshop on coral reef environmental earth sciences  2014/03
• Seasonal to decadal climate signals in skeletal growth and trace elements of the Pacific sclerosponges  [Not invited]

  Ohmori K, Watanabe, T

  International Joint workshop on coral reef environmental earth sciences  2014/03
• Perplexing effects of Porites coral calcification on annual interval trace elements and boron isotope in northern habitable limits of Japan  [Not invited]

  Sowa,K, Watanabe, T, Tanaka, K, Zinke,J, McCulloch, M

  International Joint workshop on coral reef environmental earth sciences  2014/03
• Multiple approaches for understanding earth environmental changes using biogenetic carbonates  [Not invited]

  Tsuyoshi Watanabe

  International Joint workshop on coral reef environmental earth sciences  2014/03
• nitrogen isotopes in caribbean coral skeletons: decadal variability in north atlantic nitrogen fixation  [Not invited]

  Yamazaki A, Hetzinger S, Reumont J. v, Tsunogai U, Watanabe, T

  Ocean Sciences Meeting 2014  2014/02
• seasonal to decadal climate signals in skeletal growth and trace elements of the pacific sclerosponges  [Not invited]

  Ohmori K, Watanabe, T

  Ocean Sciences Meeting 2014  2014/02
• coral multiple proxy approach to evaluate the impact of coastal land use on reef environments and coral growth  [Not invited]

  Watanabe, T, Miyaji T, Yamazaki A, Inoue M, Sowa K

  Ocean Sciences Meeting 2014  2014/02
• middle holocene daily light cycle recorded in the sr/ca ratios of a fossil giant clam shell  [Not invited]

  Sano Y, Hori M, Takahata N, Shirai K, Watanabe, T

  Ocean Sciences Meeting 2014  2014/02
• Coral evidence of El Niño variability during the Pliocene warm period  [Not invited]

  Watanabe, T, Suzuki, A, Minobe S, Kawashima,T, Kameo,K, Minoshima, K, M. Aguilar,Y, Wani,R, Kawahata,H, Sowa,K, Nagai,T, Kase,T

  International Joint Workshop‘‘Recent developments in Paleoenvironmental studies’’  2014/02
• coral sr/ca records from enggano island (indonesia): proxy records of iod-induced upwelling and mean sst in the eastern indian ocean  [Not invited]

  Pfeiffer, M, Takayanagi, H, Cahyarini S. Y, Watanabe, T, Garbe-Schoenberg, D

  Ocean Sciences Meeting 2014  2014/02
• The potential of tridacna shells as a microanalytical reference material for biogenic carbonate  [Not invited]

  Amini, M, Jacob, D. E, Shirai, K, Watanabe, T, Weis, D

  Ocean Sciences Meeting 2014  2014/02
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in biogenetic carbonates  [Invited]

  Tsuyoshi Watanabe

  2014/01
• Coral growth characteristics and marine environments during Pliocene warm periods  [Invited]

  Tsuyoshi Watanabe

  2013/11
• A 150-year variation of Kuroshio transport detected by the nitrate δ15N records in coral skeletons  [Not invited]

  Yamazaki, A, Watanabe, T, Tsunogai, U, Iwase, F, Yamano, H

  Goldschmidt Conference  2013/08
• Corals at volcanic island of Satsuma iwo-jima: Implication for a new proxy of hydrothermal events and biological adaptation  [Not invited]

  Watanabe, T, Kamimura, K, Yamazaki, A, K. Omori, Le Guern, F, Kiyokawa, S

  Goldschmidt Conference  2013/08
• A 150-year coral record reveals intensification of oligotrophic Kuroshio transport to temperate North Pacific  [Not invited]

  Yamazaki, A, Watanabe, T, Tsunogai, U, Iwase, F, Yamano, H

  3rd International Sclerochronology Conference  2013/05  North Wales, UK
• High latitude coral records in Japan: Implication for climate changes and coral adaptation  [Not invited]

  Watanabe, T, Yamazaki,A, Kawamura, T, Jumpei, I, Nakamura, T, Sowa, K, Iwase, F, Nomura, K, Sugihara, K, Abe, O, Sakamoto, T, Murayama, M, Yamano, H

  , 3rd International Sclerochronology Conference  2013/05  North Wales, UK
• Daily light cycle reconstructed by Sr/Ca in a fossil giant clam, Tridacna gigas, lived in 4.6 ka, southern Japan , Japan Geoscience Union annual meeting  [Not invited]

  Hori, M. Shirai, K. Takahata, N. Sano, Y. Kobayashi, N. Okamoto, K. Watanabe, T

  Japan Geoscience Union annual meeting  2013/05  Chiba, Japan,
• サンゴ骨格に記録される 炭素同位体比のvital effectの理解に向けたサンゴポリプモデルの開発  [Not invited]

  中村隆志, 灘岡和夫, 渡邉 敦, 宮島利宏, 渡邊 剛

  日本地球惑星科学連合大会  2013/05
• シャコガイの酸素安定同位体値から復元した4.8 kaの海水温変動  [Not invited]

  堀 真子, 白井厚太朗, 佐野有司, 山田愛, 岡本和明, 渡邊 剛

  炭酸塩コロキウム2017  2013/03
• サンゴ骨格に記録された赤道太平洋表層水中の人工放射性核種236U変動  [Not invited]

  坂口 綾, 江藤飛鳥, Peter Steier, 山崎敦子, 渡邊剛, 佐々木圭一, 高橋嘉夫, 山野博哉

  2013/03
• シャコガイの微小領域測定からみる6000年 前の古海洋環境  [Not invited]

  堀 真子, 白井厚太朗, 高畑直人, 佐野有司, 小林夏子, 岡本和明, 渡邊 剛

  古海洋シンポジウム  2013/01
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in biogenetic carbonates  [Invited]

  Tsuyoshi Watanabe

  GEOMAR  2012/10  Kiel, Germany
• Coral growth histories with environmental changes during last 100 years recorded in massive Porites colonies at four near shore regions of mid-latitude in Japan  [Not invited]

  Watanabe, T, Yamazaki,A, Kawamura, T, Jumpei, I, Nakamura, T, Sowa, K, Iwase, F, Nomura, K, Sugihara, K, Abe, O, Sakamoto, T, Murayama, M, Yamano, H

  12th International Coral Reef Symposium  2012/07  Carnes, Australia
• Reconstruction of land-use change effects using coral skeletal proxies in Ishigaki Island, Japan  [Not invited]

  Ohmori, K, Watanabe, T, Miyaji, T, Hasegawa, H, Ishihara, M, Yamano, H

  12th International Coral Reef Symposium  2012/07  Carnes, Australia
• A new biomineralization model of coral skeleton from crystal texture observation by analytical transmission electronic microscope (ATEM)  [Not invited]

  Motai S, Sowa K, Nagai T, Watanabe T

  12th International Coral Reef Symposium  2012/07  Carnes, Australia
• No sympathetic temporal trends of temperate coral calcification rate  [Not invited]

  Sowa.K, Watanabe T

  12th International Coral Reef Symposium  2012/07  Carnes, Australia
• Nitrogen isotope of coral skeleton,s as a proxy for marine nitrate sources in coral reefs  [Not invited]

  Yamazaki, A. Watanabe, T. Tsunogai

  12th International Coral Reef Symposium  2012/07  Carnes, Australia
• 太平洋に生息する硬骨海綿骨格の底板形成メカニズム  [Not invited]

  大森一人, 渡邊 剛

  日本古生物学会年会  2012/07
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in biogenetic carbonates  [Invited]

  Watanabe, T

  RWTH Aachen University  2012/06  Aachen, Germany
• 北海道伊達市有珠の遺跡から復元されたアイヌ時代の古環境-調査速報  [Not invited]

  添田雄二, 青野友哉, 菅野修広, 松田宏介, 中村賢太郎, 上中央子, 三谷智広, 渡邊 剛, 宮地 鼓, 鈴木明彦, 圓谷昂史, 鈴木正章, 伊達元成

  日本文化財科学会第２９回京都大会  2012/06
• サンゴ年輪気候学—造礁性サンゴの骨格に記録された過去から現在の地球表層環境の変動—  [Invited]

  渡邊剛

  東北大学理学部  2012/05
• Application of coral 15N proxy: interannual variability of water mass in Tatsukushi Bay due to Kuroshio volume changes  [Not invited]

  A. Yamazaki, T. Watanabe, U. Tsunogai

  JpGU International Symposium 2012  2012/05
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in biogenetic carbonates  [Invited]

  Tsuyoshi Watanabe

  University of Western Australia  2012/03  Perth, Australia
• 造礁性サンゴ骨格の窒素同位体比：貧栄養海域における栄養塩の新指標  [Not invited]

  山崎敦子, 渡邊 剛, 角皆 潤

  炭酸塩コロキウム  2012/03  伊豆
• ハマサンゴ骨格に記録された土地利用変遷の復元の可能性、炭酸塩コロキウム  [Not invited]

  大森一人, 渡邊剛

  炭酸塩コロキウム  2012/03  伊豆
• 鮮新世温暖期の熱帯域海洋環境と造礁サンゴの成長特性と海洋環境  [Not invited]

  渡邊 剛, 大森一人, 鈴木 淳, 加瀬友喜

  炭酸塩コロキウム  2012/03
• High-resolution windows for marine environments and biological responses in biogenic carbonates  [Not invited]

  Tsuyoshi Watanabe

  2nd International Geoscience symposium  2012/03  Keelung, Taiwan
• Pacific sclerosponges as new paleoenvironmental archives -geochemical and micro structural approaches  [Not invited]

  Ohmori, A, Watanabe, T, Tanimizu, M, Matsuoka, J, Shirai,K

  2nd International Geoscience symposium  2012/03  Keelung, Taiwan
• Nitrogen isotope of coral skeletons: A new proxy for nitrogenous nutrients in oligotrophic oceans  [Not invited]

  Yamazaki, A, T. Watanabe, U. Tsunogai

  2nd International Geoscience symposium  2012/03  Keelung, Taiwan
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in biogenetic carbonates  [Invited]

  Tsuyoshi Watanabe

  Bandung Institute of Technology  2012/02  Bandung, Indonesia
• 鮮新世温暖期における造礁サンゴの成長特性と海洋環境  [Not invited]

  渡邊 剛, 大森一人, 鈴木 淳, 加瀬友喜

  日本古生物学会  2012/01  富岡市
• 成長縞編年学及び貝殻安定酸素同位体比解析に基づく北海道オホーツク海及び日本海の潮下帯に生息する二枚貝３種の生活史  [Not invited]

  三村俊弘, 宮地 鼓, 渡邊 剛, 棚部一成

  日本古生物学会  2012/01  富岡市
• 石垣島轟川周辺海域より採取されたサンゴ骨格中の微量元素を用いた海洋環境の復元  [Not invited]

  石川大策, 井上麻夕里, 鈴木淳, 渡邊 剛, 川幡穂高, 山野博哉

  古海洋シンポジウム  2012/01
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in corals  [Invited]

  Tsuyoshi Watanabe

  National Nuclear Energy Agency  2012/01  Jakarta, Indonesia
• Nitrogen isotope of coral skeletons: A new proxy for nitrogenous nutrients in oligotrophic oceans  [Not invited]

  Yamazaki, A, T. Watanabe, U. Tsunogai

  AGU fall meeting  2011/12  San Francisco
• Coral growth characteristics and marine environments during Pliocene warm period  [Not invited]

  Watanabe, T, Ohmori, K, Suzuki, A, Kase, T

  AGU fall meeting 2011  2011/12
• Modern temperate coral growth analysis in North-west Pacific  [Not invited]

  Sowa, K, Watanabe, T, Sakamoto T

  AGU fall meeting  2011/12  San Francisco
• 新たな造礁性サンゴ骨格形成モデルに向けて-鉱物学的アプローチを用いて  [Not invited]

  甕聡子, 永井隆哉, 岨康輝, 渡邊剛

  バイオミネラリゼーション研究会  2011/12  東京
• 名蔵海域における完新世ハマサンゴ骨格の石灰化量変遷史  [Not invited]

  岨康輝, 渡邊剛, 坂本竜彦, 山野博哉, 菅浩伸

  日本サンゴ礁学会  2011/11  沖縄
• 石垣島轟川流域に生息するハマサンゴ骨格に記録された土地利用変遷の復元の可能性  [Not invited]

  大森一人, 渡邊剛, 長谷川均, 石原光則, 山野博哉

  日本サンゴ礁学会  2011/11  沖縄
• 造礁性サンゴ骨格の窒素同位体比から復元する 石垣島白保サンゴ礁の陸起源硝酸負荷の変遷  [Not invited]

  山崎敦子, 渡邊 剛, 宮地 鼓, 角皆 潤, 長谷川 均, 山野 博哉

  日本サンゴ礁学会  2011/11  沖縄
• 和歌山県串本町における長寿サンゴ骨格の酸素・炭素安定同位体比からみた成長履歴と環境適応  [Not invited]

  井笹純平, 渡邊 剛, 中村隆志, 阿部 理, 野村恵一

  日本サンゴ礁学会  2011/11  沖縄
• 鹿児島県甑島列島より採取されたハマサンゴを用いた過去106年間の東シナ海の環境変動と造礁性サンゴの成長応答  [Not invited]

  河村 卓, 渡邊 剛, 村山雅史, 山野浩哉

  日本地球化学会  2011/09  札幌
• 北西太平洋温帯サンゴの石灰化量変遷史  [Not invited]

  岨康輝, 渡邊剛, 坂本竜彦

  日本地球化学会  2011/09  札幌
• 和歌山県串本の温帯域造礁性サンゴ骨格の酸素・炭素安定同位体比解析―現代と小氷期末の海洋環境とサンゴ骨格成長特性の比較―  [Not invited]

  井笹純平, 渡邊 剛, 中村隆志, 阿部 理, 野村恵一

  日本地球化学会  2011/09  札幌
• サンゴ骨格の窒素同位体比に記録されるサンゴ礁に流入する陸起源硝酸の季節変動  [Not invited]

  山崎敦子, 渡邊 剛, 角皆 潤

  日本地球化学会  2011/09  札幌
• NanoからMicroスケールでのサンゴ骨格の微細構造観察  [Not invited]

  甕聡子, 永井隆哉, 岨康輝, 渡邊剛

  日本鉱物科学会  2011/09  水戸
• Nitrogen isotope of coral skeletons: A new proxy for nitrogenous nutrients in subtropical and tropical ocean  [Not invited]

  Yamazaki, A, T. Watanabe, U. Tsunogai

  JpGU International Symposium  2011/05  幕張
• Pliocene El Niño -High-resolution coral evidence of robust interannual variability during warm period  [Invited]

  Tsuyoshi Watanabe

  Nederlands Instituut voor Onderzoek der Zee (NIOZ)  2011/03
• 造礁性サンゴ骨格に記録される海水硝酸の窒素同位体比  [Not invited]

  山崎敦子, 渡邊 剛, 角皆 潤

  炭酸塩コロキウム  2011/03
• ポンマ遺跡のアサリ貝殻に記録される17世紀の古環境  [Invited]

  渡邊剛

  2011/02
• 石垣島白保サンゴ礁轟川河口における造礁性サンゴ骨格と海水硝酸の窒素同位体比の比較  [Not invited]

  山崎敦子, 渡邊 剛, 角皆 潤

  日本サンゴ礁学会  2010/12  筑波
• 石垣島に生息するハマサンゴ骨格の発光バンドと腐植物質の関係  [Not invited]

  岨 康輝, 渡邊 剛, 坂本竜彦, 長尾誠也

  日本サンゴ礁学会  2010/12  筑波
• サンゴ礁生物群集の帯状分布パターンの解析と環境応答モデルの構築  [Not invited]

  中村隆志, 渡邉 敦, 渡邊 剛, 茅根 創, 山野博哉, 本郷宙軌

  日本サンゴ礁学会  2010/11  茨城
• 石垣島轟川流域の造礁性サンゴに記録される土地利用の歴史的変化 -その１；キャリブレーション-  [Not invited]

  渡邊 剛, 山崎敦子, 石原光則, 岨 康輝, 大森一人, 長谷川均, 安村茂樹, 山野博哉

  日本サンゴ礁学会  2010/11  茨城
• 和歌山県串本の温帯域 造礁性サンゴ骨格の酸素・炭素安定同位体比の変動  [Not invited]

  井笹純平, 渡邊 剛, 中村隆志, 阿部 理, 野村恵一

  日本地球化学会  2010/09  熊谷
• 高知県竜串湾に生息する造礁性サンゴ骨格の窒素同位体比組成に与える黒潮流量の影響  [Not invited]

  山崎敦子, 渡邊 剛, 角皆 潤, 中地シュウ, 山野博哉, 岩瀬文人

  日本地球化学会  2010/09
• 鹿児島県甑島列島に生息する造礁性サンゴ骨 格中の過去68年間の酸素・炭素安定同位体比解析  [Not invited]

  河村 卓, 渡邊 剛, 村山雅史, 山野博哉

  日本地球化学会  2010/09  熊谷
• 淡水性長寿二枚貝カワシンジュガイ殻の古環境復元指標としての評価  [Not invited]

  渡邊 剛, 香本佳彦, 白井厚太朗

  日本地球化学会  2010/09  熊谷
• サンゴ骨格を構成するaragoniteの成長過程に関する鉱物学的考察  [Not invited]

  甕 聡子, 永井隆哉, 岨 康輝, 渡邊 剛, 坂本直哉, 圦本尚義

  日本鉱物学会  2010/09  島根
• Pb concentration and isotopes in Pacific sclerosponge  [Not invited]

  Ohmori, K, Watanabe, T, Tanimizu, M, Matuoka, J, Shirai, K

  2nd International Sclerochronology Conference  2010/07  Mainz, Germany
• A new method for estimating calcification rate of coral skeletons using a transparent X-ray 2D-imaging scanner (TATSCAN-X1) in conjunction with geochemical analyses  [Not invited]

  Sowa, K, Sakamoto, T, Nakamura, T, Sakai, S, Iijima, K, Watanabe, T

  2nd International Sclerochronology Conference  2010/07  Mainz, Germany
• Comparison of daily and seasonal changes in shell microstructures and trace elemental signals for river bivalve Margaritifera laevis with in-situ environmental parameters  [Not invited]

  Watanabe, T, Komoto, Y, Shirai, K

  2nd International Sclerochronology Conference  2010/07  Mainz, Germany
• Pliocene El Nino: Coral evidence of robust seasonal to interannual variabilities during warm period  [Not invited]

  Watanabe, T, the PWPcoral Team

  EGU General Assembly 2010  2010/05  Vienna, Austria
• Seasonal variations in nitrogen isotopic composition from Okinotori coral in the tropical Western Pacific: A new proxy for marine nitrate dynamics  [Not invited]

  Yamazaki, A, Watanabe, T, Ogawa, N, Ohkouchi, N, Shirai, K, Toratani, M, Uematsu, M

  EGU General Assembly 2010  2010/05  Vienna, Austria
• 鹿児島県甑島に生息するハマサンゴ及びキクメイシの骨格中の酸素・炭素安定同 位体比解析  [Not invited]

  河村 卓, 渡邊 剛, 島村道代, 村山雅史, 山野博哉

  炭酸塩コロキウム  2010/03  高知
• 和歌山県串本の温帯域造礁性サンゴ骨格を用いた古環境復元  [Not invited]

  井笹純平, 渡邊 剛, 岨 康輝, 阿部 理, 島村道代, 中村隆志, 野村恵一

  炭酸塩コロキウム  2010/03  高知
• サンゴコアセンター構想  [Not invited]

  渡邊剛

  炭酸塩コロキウム  2010/03
• 生物起源炭酸塩の微小領域元素分布による新たな視点からの古環境復元  [Not invited]

  白井厚太朗, 高畑直人, 渡邊 剛, 佐野有司

  日本古生物学会  2010/01  滋賀県立琵琶湖博物館
• High-resolution reconstruction of palaeoclimates using stable isotopes and trace elements in daily to annual bands of biogenic carbonates  [Invited]

  Tsuyoshi Watanabe

  Western Pacific Paleoceanography Workshop I: Future Challenges  2010/01  National Taiwan Ocean University, Keelung, Taiwan
• 造礁性サンゴ骨格中の酸素・炭素同位体比を用いた中 緯度温帯域における環境復元  [Not invited]

  島村道代, 河村 卓, 渡邊 剛

  平成21年度 高知大学海洋コア総合研究センター全国共同利用研究成果発表会  2010/01  東京大学
• 最北限サンゴ礁から得られたサンゴ骨格中の環境履歴  [Not invited]

  島村道代, 渡邊 剛, Kiseong Hyeong, 杉原 薫, 山野博哉

  2009年度古海洋シンポジウム  2010/01  東京大学
• サンゴ礁と地球環境変動  [Invited]

  渡邊剛

  金沢大学環日本海域環境研究センター  2009/12  金沢大学環日本海域環境研究センター
• 硬骨海綿骨格中の鉛同位体比を用いた海洋鉛放出源の時系列変動  [Not invited]

  大森一人, 渡邊 剛, 谷水雅治, 松岡 淳, 井上麻夕里, 白井厚太朗

  日本サンゴ礁学会第12回大会  2009/11  沖縄
• 高知県竜串湾に生息する造礁性サンゴ骨格を用いた温帯域の古環境復元  [Not invited]

  山崎敦子, 渡邊 剛, 岨 康輝, 中地シュウ, 山野博哉, 岩瀬文人

  日本サンゴ礁学会第12回大会  2009/11  沖縄
• サンゴの移動飼育水槽を用いた北海道における環境教育の試み  [Not invited]

  池田昌隆, 渡邊 剛, 山崎敦子, 河村 卓

  日本サンゴ礁学会第12回大会  2009/11  沖縄
• ストレスとサンゴ礁の歴史的変化：サンゴ年輪分析  [Invited]

  渡邊剛

  公開シンポジウム「サンゴ礁学の創成 - 複合ストレス下の生態系と人との共生・共存未来戦略 - 」  2009/11  本部町中央公民館大ホール、沖縄
• Geochemical analyses of coral skeletons  [Not invited]

  Shimamura, M, Watanabe, T

  Workshop of the Korea/Japan collaboration project  2009/10  Iki, Nagasaki, Japan
• Environmental changes in Korea/Tsushima Strait region for the last 40 years recorded in Iki faviid coral  [Not invited]

  Shimamura, M, Inah Son, Chan min Yoo, Watanabe, T, Yamano, H, Kiseong Hyeong

  International Workshop on Tropical Ocean Dynamics and Mid-latitudinal Phenomena in the Northwestern Pacific Ocean  2009/10  Seogwipo, South Korea
• 北限サンゴ礁から採取されたキクメイシ属サンゴ骨格中の酸素・炭素同位体 - 中緯度域における高時間分解能古気候アーカイブとしての検討 -  [Not invited]

  島村道代, Kiseong Hyeong, 渡邊 剛, I. Seo, C. M. Yo, 入野智久, 杉原 薫, 山野博哉

  日本地球化学会  2009/09  広島
• 温帯に生息するハマサンゴとキクメイシの骨格成長パターンに関する地球化学的考察  [Not invited]

  河村 卓, 渡邊 剛, 岨 康輝, 坂本竜彦, 入野智久, 島村道代, Kiseong Hyeong, 杉原 薫, 山野博哉

  日本地球化学会  2009/09  広島
• 硬骨海綿骨格中の鉛同位体比を用いた海洋鉛放出源の時系列変動  [Not invited]

  大森一人, 渡邊 剛, 谷水雅治, 松岡 淳, 井上麻夕里, 白井厚太朗

  日本地球化学会  2009/09  広島
• Earth environmental changes recorded in biogenic carbonates in coral reefs-calibration and application-  [Invited]

  Tsuyoshi Watanabe

  National Taiwan Ocean University  2009/09  Keelung, Taiwan
• 非造礁性単体六射サンゴ骨格の同位体・微量元素分析 - 古環境復元にむけて -  [Not invited]

  垣内一秀, 大森一人, 江崎洋一, 渡邊 剛, 徳田悠希

  日本地質学会  2009/09  岡山
• 壱岐のサンゴの分析による古環境復元  [Invited]

  渡邊剛

  公開シンポジウム「サンゴと遺跡が語る壱岐の環境変遷」  2009/06  壱岐文化ホール，長崎
• 環境省地球環境研究総合推進費成果報告  [Invited]

  渡邊剛

  環境省地球環境研究総合推進費アドバイザリーボード会合  2009/06  壱岐，長崎
• サンゴコアセンターの構想  [Invited]

  渡邊剛

  サンゴ礁学研究集会  2009/06  札幌
• 太平洋に生息する硬骨海綿の骨格微細構造及びその形成過程  [Not invited]

  大森一人, 渡邊 剛, 岨 康輝, 菅 浩伸

  日本古生物学会  2009/06  千葉
• Stable isotopes and trace elements systematic study in Simeulue Island Porites corals: the uplifted corals due to December 2004 and March 2005 Sumatra earthquakes  [Not invited]

  Teddy Eka Putra, Tsuyoshi Watanabe, Tomohisa Irino, Sri Yudawati Cahyarini

  Annual meeting of Geological society of Japan in Hokkaido branch  2009/05  Hokkaido University
• 軟X線画像によるサンゴの石灰化量定量法開発  [Invited]

  岨 康輝, 渡邊 剛, 坂本竜彦, 飯島耕一, 杉原 薫, 永田俊輔, 山野博哉

  炭酸塩コロキウム  2009/03  茨城
• カワシンジュガイ殻断面の成長線解析  [Not invited]

  香本佳彦, 渡邊 剛

  第22回北海道水生昆虫研究会  2009/03  札幌
• サンゴ骨格の微細構造観察  [Not invited]

  甕 聡子, 永井隆哉, 岨 康輝, 渡邊 剛

  日本サンゴ礁学会第11回大会  2008/11
• 沖ノ鳥島の造礁性サンゴ骨格を用いた海洋表層の栄養塩環境の復元  [Not invited]

  山崎敦子, 渡邊 剛, 白井厚太朗, 小川奈々子, 大河内直彦, 植松光夫

  日本サンゴ礁学会第11回大会  2008/11
• サンゴ礁と地球環境～千年サンゴが教えてくれること～  [Invited]

  渡邊剛

  牟岐千年サンゴの森シンポジウム  2008/10  徳島、牟岐町海の総合文化センター
• サンゴ骨格年輪と地球環境変動  [Invited]

  渡邊剛

  樹木年輪研究会  2008/09  東京農業大学
• サンゴ骨格の微細構造観察  [Not invited]

  甕 聡子, 永井隆哉, 坂本直哉, 岨 康輝, 渡邊 剛, 圦本尚義

  日本鉱物科学会  2008/09
• サンゴ骨格に記録された窒素同位体比の季節変動：低緯度海洋表層における栄養塩指標としての可能性  [Not invited]

  山崎敦子, 渡邊 剛, 川島龍憲, 小川奈々子, 大河内直彦, 白井厚太朗, 佐野有司, 植松光夫

  日本地球化学会第55回年会  2008/09
• 軟エックス線写真・非破壊蛍光X線地殻コアロガー（TATSCAN）を利用した迅速なサンゴ骨格成長量・化学組成変動分析による古環境解析手法の開発  [Not invited]

  岨 康輝, 渡邊 剛, 坂本竜彦, 飯島耕一, 高沢昌芳, 入野智久, Aguilar,Y. M, 加瀬友喜

  日本地球化学会第55回年会  2008/09
• 硬骨海綿骨格内に保存された微量元素濃度変動を用いた古環境復元への可能性  [Not invited]

  大森一人, 渡邊 剛, 白井厚太朗

  日本地球化学会第55回年会  2008/09
• 鮮新世のエルニーニョ：化石サンゴ年輪に記録される大気海洋の数年変動  [Not invited]

  渡邊 剛, 鈴木 淳, 川島龍憲, 見延庄士郎, 亀尾浩司, 簑島佳代, Yolanda Maac Aguilar, 和仁良二, 川幡穂高, 加瀬友喜

  日本地球化学会第55回年会  2008/09
• 軟エックス線写真を利用したサンゴ骨格の成長量分析による迅速な古環境解析へのアプローチ  [Invited]

  岨 康輝, 渡邊 剛, 高沢昌芳, 入野智久

  地球環境総合推進費 平成20年地球環境革新型研究課題 キックオフ会合兼アドバイザリーボード会合  2008/08  札幌
• 造礁性サンゴ骨格を用いた温暖化とその影響の検出に関する研究  [Invited]

  渡邊 剛, 島村道代, 岨 康輝

  地球環境総合推進費 平成20年地球環境革新型研究課題 キックオフ会合兼アドバイザリーボード会合  2008/08  札幌
• Seasonal variation of d15N in coral skeletons  [Not invited]

  Yamazaki, A, Watanabe, T, Kawashima, T, Ohkouchi, N, Ogawa, N, Uematsu, M

  11th International Coral Reef Symposium  2008/07  Fort Lauderdale, Florida, USA
• Pliocene El Nino -High-Resolution Coral Evidence of Robust Interannual Variability During Warm Period-  [Not invited]

  Watanabe, T, Suzuki, A, Kawashima, T, Minobe, S, Aguilar, Y, Kameo, K, Minoshima, K, Wani, R, Kawahata, H, Kase, T

  11th International Coral Reef Symposium  2008/07  Fort Lauderdale, Florida, USA
• 微細構造・微量元素組成からみた太平洋に生息する硬骨海綿の古環境解析への応用  [Not invited]

  大森一人, 渡邊 剛, 白井厚太朗

  札幌古海洋勉強会  2008/07
• 北海道尻別川産カワシンジュガイの成長線解析及び微量元素分析による高解像度河川環境復元  [Not invited]

  香本佳彦, 渡邊 剛, 白井厚太朗

  日本古生物学会2008年年会  2008/07
• 微細構造・微量元素組成からみた太平洋に生息する硬骨海綿の古環境解析への応用  [Not invited]

  大森一人, 渡邊 剛, 白井厚太朗, 管 浩伸

  東京大学海洋研究所共同利用研究集会  2008/06  東京
• サンゴ骨格中の有機物を利用した古環境解析  [Not invited]

  岨 康輝, 山崎敦子, 渡邊 剛

  東京大学海洋研究所共同利用研究集会  2008/06  東京
• Application of density profiles using X-ray photoanalysis to paleoenvironment reconstruction  [Not invited]

  Watanabe, T, Sowa, K, Irino, T, Takasawa, M

  International workshop on the Japan-Korea collaborative research on mid-latitude corals  2008/03  Fukuoka
• 石垣島白保サンゴ礁におけるサンゴ骨格の元素・同位体比組成―轟川流域の土地利用変化の影響評価―  [Not invited]

  川島龍憲, 渡邊 剛, 白井厚太朗, 小川奈々子, 島村道代, 田中敏明, 前川 聡, 入野智久, 佐野有司, 福山龍次, 大河内直彦

  炭酸塩コロキウム  2008/03
• サンゴ骨格に記録された窒素同位体比の季節変動：低緯度海洋表層における栄養塩指標としての可能性  [Not invited]

  山崎敦子, 渡邊 剛, 川島龍憲, 大河内直彦, 小川奈々子, 植松光夫, 白鳳丸K, 乗船者一同

  炭酸塩コロキウム  2008/03
• サンゴ骨格に含まれる有機物の窒素同位体比変動  [Not invited]

  山崎敦子, 渡邊 剛, 川島龍憲, 坂田智佳, 大河内直彦, 小川奈々子, 植松光夫, 白鳳丸K, 乗船者一同

  日本サンゴ礁学会第11回大会  2007/11
• Evaluation of the platygyrian coral as an environmental recorder in temperate regions  [Not invited]

  Shimamura, M, Hyeong, K, Watanabe, T, Irino, T, Yoo, C, Kim, W. S

  General discipline sessions for the 2007 GSA Denver Annual Meeting  2007/10
• シャコガイ殻の微量元素組成の周期変動  [Not invited]

  小林紗由美, 白井厚太朗, 渡邊 剛, 岨康輝, 岩井憲二, 高畑直人, 佐野有司

  日本地球化学学会  2007/09
• サンゴ骨格の日輪構造内における酸素同位体比組成  [Not invited]

  渡邊 剛, 岨康輝, 坂本直哉, 圦本尚義

  日本地球化学学会  2007/09
• 鮮新世のエルニーニョ：高解像度サンゴ年輪に記録される温暖期における大気海洋数年変動  [Not invited]

  渡邊 剛, 鈴木 淳, 川島龍憲, 見延庄士郎, 亀尾浩司, 蓑島佳代, 川幡穂高, Aguilar, Y, 和仁良二, 加瀬友喜

  日本地質学会  2007/09
• 沖ノ鳥島の造礁性サンゴ骨格に記録された環境変動  [Not invited]

  渡邊 剛, 白井厚太朗, 坂田智佳, 山崎敦子, 大河内直彦, 小川奈々子, 白鳳丸K, 乗船者一同, 植松光夫

  日本海洋学会秋季大会  2007/09
• Coral skeletal carbon isotope composition as a proxy for solar intensity and turbidity  [Not invited]

  Shimamura, M, Oba, T, Irino, T, Hyeong, K, Watanabe, T, Lu, B, Xu, G, Wang, L, Toyoda, K

  10th International Conference on Paleoceanography  2007/09
• Minor and trace element geochemistry of a branching coral Acropora sp skeleton  [Not invited]

  Shirai, K, Takahata, N, Amakawa, H, Watanabe, T, Kawashima, T, Sowa, K, Sano, Y

  17th Goldschmidt conference  2007/08
• 中期鮮新世温暖期のエルニーニョイベントの周期性；化石サンゴ年輪の酸素同位体比からのアプローチ  [Not invited]

  渡邊 剛, 鈴木 淳, 加瀬友喜, 川島龍憲, 見延庄士郎, 亀尾浩司, 蓑島佳代, 川幡穂高, Aguilar, Y, 和仁良二

  日本古生物学会  2007/06
• シャコガイ殻の日輪構造と同位体比・微量元素の分布  [Not invited]

  渡邊 剛, Ander, M, 白井厚太朗, Cuif J.-P, 横山一巳, 中森亨, 佐野有司

  日本サンゴ礁学会第11回大会  2006/11
• High Resolution Reconstructing Palaeoclimates in Tropical and Sub Tropical Regions using Stable Isotopes and Trace Elements in Biogenic Carbonates  [Invited]

  Tsuyoshi Watanabe

  Korean Ocean Research and Development Institute  2006/09
• Elemental fractionation in biogenic calcium carbonates  [Not invited]

  Shirai, K, Watanabe, T, Takahata, N, Sano Y

  16th Goldschmidt conference  2006/08
• Pliocene El Nino -High-Resolution Coral Evidence of Robust Interannual Variability During Warm Period-  [Not invited]

  Watanabe, T, Suzuki, A., S, Aguilar, Y, Kameo, K, Minoshima, K, Wani, R, Kawahata, H, Kase, T

  International Sedimentological Congress  2006/08
• サンゴ化石に記録された中期鮮新世温暖期のエルニーニョ現象  [Not invited]

  渡邊 剛, 鈴木 淳, 加瀬友喜, 見延庄士郎, 亀尾浩司, 簑島佳代, 川幡穂高, Aguilar, M, 和仁良二

  日本古生物学会  2006/06
• シャコガイ殻は日単位の環境を記録しているのか？-日輪構造と同位体比、微量元素の分布-  [Not invited]

  渡邊 剛, Meibom, A, 白井厚太朗, Cuif J.-P, 横山一巳, 中森亨, 佐野有司

  日本古生物学会  2006/02
• Coral evidence of El Nino events during the Pliocene Warm Period  [Not invited]

  Watanabe, T, Suzuki, A, Kase, T, Minobe, S, Aguilar, Y.M, Kameo, K, Minoshima, K, Wani, R, Kawahata, H

  GEOCOM  2006
• サンゴ骨格に記録される地球環境変動  [Invited]

  渡邊剛

  日本地球化学会若手会シンポジウム  2005/09
• 石垣島白保サンゴ礁における造礁性サンゴの骨格成長メカニズム-轟川流域におけるハマサンゴの酸素・炭素安定同位体比解析  [Not invited]

  川島龍憲, 渡邊 剛, 白井厚太朗, 前川 聡, 島村道代, 入野智久, 佐野有司

  日本地球化学会第55回年会  2005/09
• サンゴ骨格に記録される地球環境変動  [Invited]

  渡邊剛

  日本古生物学会  2005/07  東京大学理学部化学講堂  設立70周年記念シンポジウム「地球生命史研究の最前線」
  
• Isotopic and trace elemental distributions in daily growth lines of giant clam  [Not invited]

  Watanabe, T, Meibom, A, Cuif, J. P, Yokoyama, K, Shirai, K, Juillet-Leclerc, A, Nakamori, T, Sano, Y, Oba, T

  European Geosciences Union  2005/04
• Isotopic and trace elemental distributions in daily growth lines of giant clam  [Not invited]

  Watanabe, T, Meibom, A, Cuif, J. P, Yokoyama, K, Nakamori, T, Oba, T

  8th International Conference on Paleoceanography  2004/09
• Life history of the Pliocene scallop Fortipecten, based on oxygen and carbon isotope profiles  [Not invited]

  Nakashima, R, Suzuki, A, Watanabe, T, Kawahata, H

  International Geological Congress 2004  2004/08
• Calibration Comparison and Warm Pool Palaeoclimate Reconstruction for Diploastrea heliopora and Porites Corals  [Not invited]

  Watanabe, T, Gagan, M. K, Corrége, T, Hantoro, W. S, Gagan, H. S, Mortimer, G. E, Cowley, J, McCulloch, M. T

  European Geosciences Union  2004/04
• High Resolution Reconstructing Palaeoclimates in Tropical Regions using Stable Isotopes and Trace Elements in Biogenic Carbonates  [Invited]

  Tsuyoshi Watanabe

  Conf04) High Resolution RecConfy  2004/03
• High Resolution Reconstructing Palaeoclimates in Tropical and Sub Tropical Regions using Stable Isotopes and Trace Elements in Biogenic Carbonates  [Invited]

  Tsuyoshi Watanabe

  13th Goldschmidt Conference  2003/09
• 中期完新世における久米島産化石オオジャコガイ殻の60年間の安定同位体比記録：最北端の生息域における生理学的、古気候学的意義  [Not invited]

  渡邊 剛, 鈴木 淳, 川幡穂高, 菅 浩伸, 小川 真司, 蓑島佳代

  日本古生物学会  2003/01
• サンゴ骨格に記録される西太平洋暖水隗域における降水量・蒸発量  [Not invited]

  渡邊 剛, Gagan, M, Correge, T, Hantoro, W, McCulloch, MT

  古海洋学シンポジウム  2003/01
• サンゴ礁の生物に記録される環境変動（概論）、サンゴ、シャコガイ、硬骨海綿  [Invited]

  渡邊剛

  第２回地球システム・地球進化ニューイヤースクールレクチャー  2003/01
• High-resolution Reconstructing Palaeoclimates in Tropical-Sub Tropical Regions using Stable Isotopes and Trace Elements in Biogenic Carbonates  [Invited]

  Tsuyoshi Watanabe

  20th IFREE4 seminar  2002/12
• Warm Pool Palaeoclimate Reconstruction for Diploastrea heliopora and Porites Corals  [Not invited]

  T. Watanabe, M. K. Gagan, T. Corrége, W. S. Hantoro, H. Scott-Gagan, J. Cowley, G. E, Mortimer, M. T. McCulloch

  日本サンゴ礁学会  2002/10
• Palaeoclimate Reconstruction using Diploastrea and Porites Corals from Alor in Eastern Indonesia  [Invited]

  Watanabe, T, Gagan, M. K, Corrége, T, Hantoro, W. S, Gagan, H. S, Cowley, J, Mortimer, G. E, McCulloch, M. T

  Annual meeting of Convention of Indonesian Association of Geologists  2002/10
• 炭酸塩骨格を用いた高分解能古気候復元；サンゴ、シャコガイ、硬骨海綿  [Invited]

  渡邊剛

  札幌古海洋勉強会  2002/06
• 新たな熱帯古気候復元の指標としての造礁性サンゴDiploastrea属  [Not invited]

  T. Watanabe, M. K. Gagan, T. Corrége, W. S. Hantoro, H. Scott-Gagan, J. Cowley, G. E, Mortimer, M. T. McCulloch

  地球惑星科学関連学会合同大会  2002/05
• Reconstructing Palaeoclimates using stable isotopes and trace elements in biogenic carbonates  [Invited]

  Tsuyoshi Watanabe

  Lecture in Texas A&M University  2002/04
• Calibration Comparison and Warm Pool Palaeoclimate Reconstruction for coral Diploastrea and Porites  [Not invited]

  Watanabe, T, Gagan, M. K, Correge, T, Hantoro, W. S, Cabioch, G

  Annual Records of Tropical Systems Open Science meeting  2001/11
• Evaluation of accuracy in coral isotope records for environmental proxy  [Not invited]

  Watanabe, T, Winter, A, Oba, T, Anzai, R, Ishioroshi, H

  Australian Coral Records Research meeting 2001  2001/02
• サンゴ骨格の安定同位体比と微量元素を用いた過去の塩分の定量復元の可能性  [Not invited]

  渡邊 剛, 大場忠道, Winter, A

  地球惑星科学関連学会合同学会  2000/06
• シャコガイ殻の酸素同位体比の高解像度分析による水温の日変化の復元  [Not invited]

  渡邊 剛, 大場忠道

  第246回地質調査所研究集会  2000/02
• サンゴ骨格の酸素同位体比とMg/Ca比を用いた水温と塩分の季節変化の復元  [Not invited]

  渡邊 剛, 大場忠道

  第246回地質調査所研究集会  2000/02
• サンゴ・シャコガイ骨格を用いた過去の海洋環境の高解像度復元  [Invited]

  渡邊剛

  2000/01
• Seasonal changes in sea surface temperature and salinity during the Little Ice Age in the Caribbean Sea deduced from Mg/Ca and 18O / 16O ratios in corals  [Not invited]

  Watanabe, T, Winter, A, Oba, T

  American Geophygical Union Fall meeting  1999/12
• サンゴ骨格の酸素同位体比とMg/Ca比を用いた過去の水温と塩分の復元  [Not invited]

  渡邊 剛, 大場忠道, Winter,A

  日本地球化学会  1999/10
• サンゴ骨格の安定同位体および微量元素を用いたカリブ海における小氷期の古環境復元  [Not invited]

  渡邊 剛, 大場忠道, Winter, A

  日本海洋学会秋季大会  1999/09
• Marine Environmental Reconstruction using stable isotopes and trace elements in coral skeletons  [Not invited]

  Watanabe, T, Winter, A, Oba, T

  International symposium on fossil Cnidaria and Porifera  1999/09
• 炭酸塩骨格から読みとる古環境記録  [Invited]

  渡邊剛

  森羅万象セミナー  1999/05
• Paleoenvironments of the Little Ice Age in the Caribbean Sea using stable isotopes and trace elements in coral skeletons  [Invited]

  Tsuyoshi Watanabe

  Dissertations Symposium on Chemical Oceanography (DISCO)  1999/05
• カリブ海プエルトリコ産サンゴ骨格の酸素同位体比とMg/Ca比を用いた小氷期の水温・塩分の復元  [Not invited]

  渡邊 剛, 大場忠道

  日本古生物学会  1999/01
• Inter- and Intraannual Stable Isotope Records from Caribbean Sclerosponges at 125m Water-depth  [Not invited]

  Böhm, F. D, Dullo, W. C, Eisenhauer, A, Joachimski, M, Oba, T, Watanabe, T, Winter, A

  American Geophygical Union Fall meeting  1998/12
• トウファ堆積場における水の安定同位体  [Not invited]

  狩野彰宏, 渡邊 剛

  日本地質学会  1998/09
• トウファの安定同位体比変動からわかる古気象変動  [Not invited]

  狩野彰宏, 渡邊 剛

  地学団体研究会  1998/08
• カリブ海のサンゴ骨格に記録された小氷期の環境変化  [Not invited]

  大場忠道, 石下洋志, 渡邊 剛, Winter, A

  日本古生物学会  1998/06
• サンゴ骨格の持つ精度と解像度の評価ープエルトリコ産のサンゴ骨格を例にしてー  [Not invited]

  渡邊 剛, 石下洋志, 大場忠道, Amos Winter

  日本古生物学会  1998/06
• Fidelity of Coral Isotopes in Recording Environmental Variables in the Eastern Caribbean  [Not invited]

  Winter, A, Oba, T, Ishioroshi, H, Watanabe, T

  American Geophygical Union Fall meeting  1997/12
• プエルトリコ産サンゴ骨格に記録されたカリブ海の環境変動  [Not invited]

  渡邊 剛, 石下洋志, 大場忠道

  日本サンゴ礁学会  1997/11
• プエルトリコ産サンゴ骨格を用いた環境解析  [Not invited]

  渡邊 剛, 石下洋志, 大場忠道, Winter, A

  日本地質学会  1997/10
• Comparisons using Oxygen and carbon isotopes from a Puerto Rican coral between 1980’s and Little ice age  [Not invited]

  Oba, T, Ishioroshi, H, Watanabe, T

  International Marine Science Symposium  1997/10
• 現生シャコガイ殻の酸素・炭素同位体比の高精度分析  [Not invited]

  渡邊 剛, 大場忠道

  日本地球化学会  1996/08
• 石垣島産現生シャコガイ殻の酸素・炭素同位体比と気象データの比較  [Not invited]

  渡邊 剛, 大場忠道

  日本地質学会  1996/04
• シャコガイ骨格中の酸素・炭素同位体比に基づく環境変動  [Not invited]

  渡邊 剛, 中森 亨, 大場忠道

  日本地質学会  1995/04
• 四射サンゴの後期成長期におけるセプタの挿入方式について  [Not invited]

  渡邊剛

  日本地質学会  1994/09

Association Memberships

• 国際サンゴ礁学会   JAPAN GEOSCIENCE UNION   THE GEOLOGICAL SOCIETY OF JAPAN   PALAEONTOLOGICAL SOCIETY OF JAPAN   日本サンゴ礁学会   

Research Projects

• 科学とアートの融合による環境変動にレジリエントな在来知の高解像度復原と未来集合知への展開

  総合地球環境学研究所：実践プロジェクト(PR-FR)

  Date (from‐to) : 2023/09 -2029/03
• The Formation of Prehistoric Populations and their Cuture In Hokkaido

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2023/04 -2028/03 

  Author : 加藤 博文, 鈴木 建治, 内山 幸子, 渡邊 剛
• El Nino in the Medieval Climate Anomaly and Human spread to remote Oceania

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2022/04 -2026/03 

  Author : 山崎 敦子, 渡邊 剛, 後藤 明, 石村 智, 駒越 太郎
• 奄美群島喜界島における集落とサンゴ礁の形成に関する研究 ２０２３ ─フィールドワークおよび模型制作を主軸とした建築学とサンゴ礁科学の共同実践

  公益財団法人ユニオン造形文化財団：調査研究

  Date (from‐to) : 2023/04 -2025/03
• サンゴ骨格に記録される産業革命以降の海洋貧酸素水塊の拡大

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

  Date (from‐to) : 2020/10 -2025/03 

  Author : 渡邊 剛, 渡邉 貴昭, 田中 健太郎, 山崎 敦子, 駒越 太郎

   

  人為起源の地球温暖化と沿岸域の富栄養化に伴う将来の海洋貧酸素化の拡大の可能性が指摘されているが、産業革命以降の気候・海洋環境変化に伴う貧酸素水塊の形成と拡大の直接的な証拠や、将来予測に不可欠な長期データが現存しない。本研究では、世界最大の貧酸素水塊の縁辺部に位置するハワイ諸島と、既に貧酸素環境にあるアラビア海という条件の異なる海域を対象とし、浅海および深海サンゴ骨格試料に対し、新たに開発する化学指標を用いることにより、海洋の 貧酸素化の拡大の変遷を復元する。本研究で復元される溶存酸素濃度の長期一次データと気候 ・海洋・生態系統合モデルを組み合わせることにより将来予測を試みる。 本年度も、昨年と同様に予定していたハワイとオマーンのフィールドワークが世界的な新型感染症の拡大により計画通り実施することができなかった。一方で、共同研究者の来日や既存の浅海サンゴのボーリングコア試料の整理と使用許可の調整や、観測モニタリング、既存のサンゴのボーリングコア試料の酸素・炭素安定同位体比ならびにMn/Ca比、Sr/Ca比の測定といった地球化学的解析を進めるなど、研究分担者がそれぞれの現地で実践できる活動を順調に進めることができた。 次年度も世界的な情勢によりフィールドワークの計画は慎重を要するが、現地の共同研究者との連携を強化し、予定していた試料の入手に取り組みつつ、既存の浅海サンゴのボーリングコア試料の再解析など現地で新たな試料を得られない場合も含めた対応の両面で検討する。
• 「ボカシの文化」にメスを入れる

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

  Date (from‐to) : 2021/04 -2024/03 

  Author : 高宮 広土, 中村 直子, 樋泉 岳二, 寒川 朋枝, 新里 貴之, 庄田 慎矢, 竹中 正巳, 黒住 耐二, 渡邊 剛
• 奄美群島喜界島における集落とサンゴ礁の形成に関する研究 ─フィールドワークおよび模型制作を主軸とした建築学とサンゴ礁科学の共同実践

  公益財団法人ユニオン造形文化財団：調査研究

  Date (from‐to) : 2022/04 -2023/03
• 科学とアートの融合による環境変動にレジリエントな在来知の再評価と未来集合知への展開

  総合地球環境学研究所：総合地球環境学研究所 実践プロジェクト予備研究(FS)

  Date (from‐to) : 2022/04 -2023/03
• 科学とアートによる人-環境相互課題解決人材の育成プログラムの開発と実装

  国立研究開発法人科学技術振興機構 研究成果展開事業：大学発新産業創出プログラム

  Date (from‐to) : 2022 -2023/03
• シャコガイ殻の日輪計測と炭酸凝集同位体法による1000万年間の地球自転速度の復元

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

  Date (from‐to) : 2020/07 -2023/03 

  Author : 渡邊 剛, 山崎 敦子, 駒越 太郎

   

  本研究は昼と夜に貝殻を開閉し太陽日輪を刻むシャコガイ殻化石を用いて、過去1000万年間の地球の自転速度を復元することを目的とする。1)シャコガイ 殻の太陽暦(日・年)キャリブレーション、2)化石シャコガイ試料の採取と年代測定、3)現生および化石の成長線解析と炭酸凝集同位体分析を行い、シャコガイ殻に記録される公転周期の中に、日輪が何本刻まれているかを計測し、過去の自転速度を復元する。本研究は世界初の地球自転計を目指すものであり、その成果は化学分析の必要ない新しい年代決定法の開発や古代天文暦の謎を解明するなど多分野への強い波及効果が期待される。地球の自転速度は地質時代を通じて海水やマントルと地殻の密度の差による摩擦力により減速しているとされているが、有史以前は自転速度を見積もることのできる観察記録が存在しない。また、過去の自転速度を直接的に復元する方法はなかった。現在の地球の条件では自転周期と原子時計にズレが生じ、約500日に1秒の閏秒が挿入される。自転速度の変化は、”海洋にかかる遠心力を変化させ地球の海水準を変動させる”、”地殻の扁平率を減少させ地球表面の日射量を増大させる”、”プレート運動の歪みを増大させ地震を発生させる”など、地球の気候変動や地殻変動への影響が示唆されているが、地球史を通じた過去の自 転速度の直接データは存在せず地球環境変動との相互関係はこれまで議論されていない。本年度は飼育実験のためのシャコガイの採取ならびに、完新世および更新世のシャコガイ化石試料を追加で採取を行い、今後年代測定を行う予定である。また、シャコガイの炭素凝集同位体比測定のために、現生及び完新世のシャコガイ化石試料の酸素同位体比測定を行い、酸素同位体比水温計の作成を行なっている。
• 地球規模の環境変動と地域カタストロフィック事変が社会の脆弱性に与える影響

  総合地球環境学研究所：実践プロジェクト予備研究（FS）

  Date (from‐to) : 2021/04 -2022/03 

  Author : 渡邊 剛
• 産業革命以降の人為起源二酸化炭素の海洋への溶解拡散の履歴と将来予測の高精度化

  公益財団法人 住友財団：2019年度環境研究助成（課題研究）

  Date (from‐to) : 2019/11 -2021/11 

  Author : 渡邊剛
• 地球規模の環境変動と地域カタストロフィック事変が社会の脆弱性に与える影響

  総合地球環境学研究所：実践プロジェクトインキュベーション研究（IS）

  Date (from‐to) : 2020/04 -2021/03 

  Author : 渡邊 剛
• Twilight zone- a key for coral reef recovery: vertical connectivity and depth adaptation of corals

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2016/04 -2020/03 

  Author : Harii Saki

   

  Mesophotic Coral Ecosystems are considered as refuges for shallow corals from bleaching and expected to act as a larval source for recovery for shallow reefs. In this study, we examined larval recruitment and adaptation from deep to shallow, genetic structures between depths, and deep environments to reveal shallow reef recovery potential from the mesophotic coral, Seriatopora hystrix. We found that reproductive seasons are shorter with increasing depth, suggesting less opportunity for larval recruitment. The species did not recruit nor survive in shallow water conditions. On the other hand, they recruit mid-water, deep depths or shaded condition in shallow, and partially grew. High genetic diversity was observed in this species for all depths with no clear partitioning of haplotypes among depths/locations. Overall, we suggest that mesophotic larvae of this species may not recruit directly to shallow water, but recruit and recover slowly via mid-water depth as stepping stone.
• The impacts of short term climate variability on Neanderthal - Homo sapiens replacement deduced from coral records(Fostering Joint International Research)

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2016 -2019 

  Author : WATANABE Tsuyoshi

   

  In this research with international framework, we could conduct the coral drilling in Hawaii islands, to reconstruct the past histories for 100 years with seasonal to decadal scale. The obtained coral data were shared and compared among international coral reef laboratory (IL-CREES), coral core center, and Kikai institute for coral reef sciences to understand the global scale climate changes and contribute coral core data base for sharing the coral records in Pacific and Indian Ocean in the world. This international researches also could contribute to enhance to accelerate international frameworks for understanding global scale climate change and it’s influence on marine ecosystem and social responses with next generation of scientists. and young people, including Vietnam, Germany, Indonesia, USA, Taiwan, France, East Timor, and Japan.
• The impacts of short term climate variability on Neanderthal - Homo sapiens replacement deduced from coral records

  Japan Society for the Promotion of Science：Fund for the Promotion of Joint International Research (Fostering Joint International Research)

  Date (from‐to) : 2016 -2019 

  Author : Tsuyoshi Watanabe
• Coral skeletal records reveal the impact of short-term climatic cycles on the transition from Neanderthals to Homo Sapiens

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2015/04 -2018/03 

  Author : WATANABE Tsuyoshi

   

  We analyzed trace elements and oxygen isotopes in fossil corals (Plesiastrea versipora and Porites sp.) from the time interval during MIS3 in Kikai Island. We found clear cyclic changes in interannual to decadal scales. Within the 22-year temperature records in Porites corals 55,000 years ago, the range of seasonal temperature variation dropped by half for 4 years. The cold (warm) water in summer (winter) could mainly reflect air temperature because we could not find same variation in oxygen isotopes of Tridacna shells. This drastic changes in air temperature could impact on the human life styles such as their food and habitability environment.
• The impacts of short term climate variability on Neanderthal - Homo sapiens replacement deduced from coral records

  Japan Society for the Promotion of Science：Scientific Research (B)

  Date (from‐to) : 2015 -2018 

  Author : Tsuyoshi Watanabe
• High-resolution climate reconstruction and understanding marine biological adaptation: analogue for warming future

  Japan Society for the Promotion of Science：Scientific Research (A) Overseas Academic Research)

  Date (from‐to) : 2013 -2018 

  Author : Tsuyoshi Watanabe
• Ultra-high resolution past marine environmental reconstruction using a NanoSIMS

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2012/05 -2017/03 

  Author : SANO Yuji, WATANABE Tsuyoshi

   

  Marine biogenic calcium carbonate, such as coral skeleton, bivalve shell and fish otolith, may record past environmental and ecological information as their chemical and isotopic compositions. We have accomplished ultra-high resolution past marine environmental reconstruction by the analysis of biogenic calcium carbonate using a NanoSIMS. Moreover we have established a method of stable isotope labeling in the biogenic calcium carbonate.
• High resolution climate records in modern and fossil corals in past warm periods: Analog for future global warming

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2013 -2017 

  Author : WATANABE Tsuyoshi, MIYAJI Tsuzumi, IKEDA Masataka

   

  We reconstructed environmental and calcification changes during past different warming periods using modern and fossil skeletons of reef builders in order to estimate the responses of coral reefs and biodiversity in future global warming. In our results, calcification rates of major reef builders were varied among each warming periods. The responses in their calcification rates were not only explained by temperature, but also influenced by the interaction with environmental factors such as temperature, salinity, nutrients, acidification, and sea level changes. Each factors were also complex influenced by their seasonal variability, climatic-ecological events, the surviving strategy of each reef builders.
• 複合的なアプローチによる生物源炭酸塩骨格を用いた地球環境変動の解明

  日本学術振興会：若手研究者戦略的海外派遣事業（頭脳循環を加速する若手研究者戦略的海外派遣プログラム）

  Date (from‐to) : 2011 -2014/03 

  Author : 渡邊剛
• Reconstruction of Kuroshio current during last 100 years using coral nutrient proxy

  Japan Society for the Promotion of Science：Scientific Research (B)

  Date (from‐to) : 2012 -2014 

  Author : Tsuyoshi Watanabe
• Reconstructing Kuroshio transport during last 100 years using geochemical proxies on coral skeletons

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2012 -2014 

  Author : WATANABE Tsuyoshi, IKEDA Masataka, MIYAJI Tuzumi, YAMAZAKI Atuko

   

  We have reconstructed the change in Kuroshio transport during last 100 years using the coral skeletons from four different areas in north Pacific of Kuroshio regions (Luetao island, Taiwan, Koshiki island, Kagoshima, Tatsukushi, Kouchi, Kushimoto, Wakayama). We applied the oxygen isotopes, strontium/calcium ratio, nitrogen isotopes on coral skeletons to estimate the past changes of salinity, temperature, and nutrient with weekly to monthly temporal resolution and discussed the relationship during last 100 among the Kuroshio behavior, global warming, and regional climate systems, including ENSO and PDO.
• Multiple approaches for understanding earth environmental changes using biogenetic carbonates

  Ministry of Education, Culture, Sports, Science and Technology：Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation

  Date (from‐to) : 2011 -2014 

  Author : Tsuyoshi Watanabe
• New proxy deployment of oligotrophic ocean using coral nitrogen isotope

  Japan Society for the Promotion of Science：Challenging Exploratory Research

  Date (from‐to) : 2012 -2013 

  Author : Tsuyoshi Watanabe
• Development of new nutrient proxy in oligotrophic oceans using coral nitrogen isotope

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2012 -2013 

  Author : WATANABE Tsuyoshi, HARII Saki, YAMAZAKI Atsuko

   

  In this research we attempted to establish new nutrient proxy in oligotrophic oceans using stable nitrogen isotopes in organic materials of reef-building coral skeletons, which grow up to several hundreds years with annual bands. Since the conventional approaches to use the adult skeleton have made the separation of the skeletal part where formed during experimental periods, we applied the primary coral polyp cultured in different nutrient conditions in this research. During the observation in experimental period, we observed distinct difference of calcification rate, skeletal structure among cultured samples in different conditions and between symbiotic and asymbiotic coral larvae.
• Morphological variability through speciation : A case of a marine planktonic diatom genus Neodenticula

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2011 -2013 

  Author : YAMASAKI Chieko, TANIMURA Yoshihiro, TANAKA Yuichiro, SAITO Megumi, YAMASAKI Makoto, WATANABE Tsuyoshi

   

  Temporal variability in valvar morphology of a marine planktonic diatom genus Neodenticula was investigated using the Earliest Quaternary sediment cores from the subarctic North Pacific Ocean. Species composition and each species' morphology of the genus changed during the Northern Hemisphere Glaciation, around 2.6 million years ago (Ma). Drastic morphological change, specifically, a dominance of a "peculiar" type, was recorded just before the extant species appeared in 2.55 Ma based on a biometric measurement of valves. On the other hand, the culture experimental results of the species indicated that the peculiar type appeared when the higher growth rates and lower availability of the major nutrients were brought(Shimada et al., 2009). Thus, we suggest that the moprhological event of the diatom genus in the subarctic Northwestern Pacific Ocean around 2.6 Ma may have reflect a short-term collapse of the nutrient regime in the ocean.
• Iron sedimentation: Reconstruction of Archean ocean environment from modern Kikai Caldera hydrothermal system

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2010 -2012 

  Author : KIYOKAWA Shoichi, OGURI Kazumasa, GOTO Shusaku, WATANABE Tsuyoshi, ITO Takashi, IKEHARA Minoru, YAMAGUCHI Kosei, SHITASHIMA Kiminori, NAKAMURA Yasuyuki

   

  We identified as following three topics. 1) Iron sedimentation period and timing, 2) Caldera forming process and sedimentation, 3) Hydrothermal process and Coral record. We identified 3 years long temperature records of ocean surface, floor and sediments with hydrothermal activity in Nagahama bay. Sediment core and coral core samples indicate sedimentation timing of Iron and record of volcanic activity.
• High-resolution reconstruction of earthquake and tsunami during last 100 years using reef building corals from Sumatra

  Japan Society for the Promotion of Science：Grant-in-Aid for Young Scientists (A)

  Date (from‐to) : 2009 -2012 

  Author : Tsuyoshi Watanabe
• Historic changes of coral reef and their stressors

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(新学術領域研究(研究領域提案型), 新学術領域研究(研究領域提案型))

  Date (from‐to) : 2008 -2012 

  Author : Hiroya YAMANO, 長谷川 均, 渡邊 剛, 井上 麻夕里, 鈴木 淳

   

  (抄録なし)
• Daily environmental changes recorded in deep-sea corals : reconstruction of the ocean surface environment over 50 years

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2010 -2011 

  Author : EZAKI Yoichi, NUMATA Hideharu, WATANABE Tsuyoshi, GOTO Shinsuke

   

  The skeleton of Flabellum(F.) magnificum provides a record of environmental variables at various time scales. The different time scales are preserved by different elements of the skeletal structure of this species. In particular, temporal changes in Sr/Ca, Ba/Ca, and Mn/Ca ratios during corallite growth reflect environmental fluctuations(e. g., nutrient availability, hydrothermal activity) at the ocean surface and in deep-sea areas. In addition, circadian rhythmicity was detected in polyp activity, and circadian clock genes were identified. In the future, it will be possible to reconstruct temporal fluctuations in the ocean environment over a period of 50 years, based on analyses of the composition of the skeleton of F. magnificum.
• スマトラ沖造礁性サンゴ骨格を用いた過去数百年間の地震及び津波履歴の高精度復元

  文部科学省：科学研究費補助金(若手研究(A))

  Date (from‐to) : 2009 -2011 

  Author : 渡邊 剛

   

  熱帯域から亜熱帯域に広く棲息する造礁性サンゴは、年輪を刻みながら炭酸塩骨格を成長させ(サンゴ年輪)、サンゴの生息期間(数百年間)に起こった様々な環境変化や事変を記録している。造礁性サンゴの成長方向(時間軸)に沿った化学分析によって週から月単位の高時間解像度で過去の生息環境の変化を復元することができる。インドネシア・スマトラ島沖の造礁性サンゴ年輪を用いて過去の地震および津波の記録を復元するという目的で研究調査を行った。スマトラ沖メンタワイ諸島の南パガイ島およびアチェ州シメル島において大型の塊状ハマサンゴの水中及び陸上掘削によるサンゴコア試料を用いた。サンゴコア試料は平板上に切断し、軟X線写真を撮影したところ、明瞭な密度バンド(年輪)が観察でき、長いコアでは現在から1750年代にまで遡ることが可能であるとわかった。また、サンゴ骨格中の微量元素濃度、酸素・炭素・窒素安定同位体比を測定した。その結果、津波による海底堆積物の撹拌や陸起源物質の流入により、骨格中の微量元素濃度が変化することが示唆された。また、炭素同位体比は、サンゴの触手に共生する褐虫藻の光合成量によって変化すると考えられており、地震前後の沈降/隆起によるサンゴ生態部の水深の変化(光量の変化)を読み取ることができる定量的な指標として有用であることが示された)。本調査により採取したサンゴ年輪の時間軸に沿った骨格構造や化学組成...
• Multidisciplinary approach for the origin of biodiversity in the tropical Southeast Asian islands

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(A))

  Date (from‐to) : 2006 -2009 

  Author : Tomoki KASE, 狩野 泰則, Satoshi CHIBA, Tsuyoshi WATANABE, 栗原 行人, 筒井 牧子, Yasunori KANO, Yukito KURIHARA, Makiko TSUTSUI

   

  This research project aims to clarify the origin of high marine biodiversity of the tropical Southeast Asian islands based on multidisciplinary studies of fossil and modern invertebrates from Philippines and Indonesia. The results include the discovery of previously unknown Cenozoic fossil assemblages, new age controls for the fossil assemblages based on microfossil analyses, segregation of marine biota between the east and west of Indonesian Seaway in Neogene times, the presence of a permanent El Nino event, etc.
• Pliocene El nino:inter annual variability of atmospheric and oceanic interaction recorded in coral annual banding 11th international coral reef conference in US

  Japan Society for the Promotion of Science：international conference

  Date (from‐to) : 2008 -2008 

  Author : Tsuyoshi Watanabe
• Pliocene El Nino -High-Resolution Coral Evidence of Robust Interannual Variability During Warm Period

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(若手研究(B))

  Date (from‐to) : 2007 -2008 

  Author : Tsuyoshi WATANABE

   

  2003 年から2006 年に渡ってフィリピンルソン島における地質調査により、相次いで非常に保存の良い中期鮮新世の化石サンゴ(3.5-3.8M)の大型群体を発見した。シンクロトロンXRD分析、電子顕微鏡観察から続成作用の受けていない2 つの大型サンゴ群体試料を選定し、それらの年輪に沿った高解像度の酸素同位体比解析から中期鮮新世温暖期におけるエルニーニョ現象の変動の復元することに成功した。
• Global climate change and increased primary production on land duringthe Cenozoic

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(A))

  Date (from‐to) : 2006 -2008 

  Author : Noriyuki SUZUKI, Ken SAWADA, Tsuyoshi WATANABE

   

  高等植物バイオマーカーの安定水素同位体比と菌類バイオマーカーの存在度に注目して地質時代における陸域の水循環を評価する方法を提案した. 新生代始新世・漸新世の一連の堆積岩に適用した結果,同時期の中緯度陸域は著しく多雨湿潤であり,顕著な基礎生産と炭素固定が行われていたと考えられる. 新生代始新世から現在までの長期的な地球気温の低下は草本質植物の進化拡大や大陸基礎生産による生物フォーシングが重要な役割を果たしたと考えられる.
• Reconstruction of El nino phenomena during last 500 using coral skeletons from new caledonia

  Japan Society for the Promotion of Science：oversea fellowship

  Date (from‐to) : 2003 -2005 

  Author : Tsuyoshi Watanabe
• Climate reconstruction of western Pacific during last 500 years using coral skeletons

  Japan Society for the Promotion of Science：fellowship

  Date (from‐to) : 1999 -2002 

  Author : Tsuyoshi Watanabe