研究者データベース

白岩 孝行(シライワ タカユキ)
低温科学研究所 附属環オホーツク観測研究センター
准教授

基本情報

所属

  • 低温科学研究所 附属環オホーツク観測研究センター

職名

  • 准教授

学位

  • 学術修士(北海道大学)
  • 博士(環境科学)(北海道大学)

ホームページURL

科研費研究者番号

  • 90235739

J-Global ID

研究キーワード

  • 環境   古気候   氷河   雪氷   Environment   Paleo climate   Glacier   Glaciology   

研究分野

  • 自然科学一般 / 大気水圏科学
  • 人文・社会 / 地理学

学歴

  •         - 1989年   北海道大学   環境科学研究科   環境構造学
  •         - 1989年   北海道大学
  •         - 1987年   早稲田大学   教育学部   地理・歴史
  •         - 1987年   早稲田大学

所属学協会

  • 東京地学協会   日本雪氷学会   日本地理学会   

研究活動情報

論文

  • Shungo Fukumoto, Shin Sugiyama, Shuntaro Hata, Jun Saito, Takayuki Shiraiwa, Humio Mitsudera
    Journal of Glaciology 1 - 14 2022年07月04日 
    Abstract On the Kamchatka Peninsula in the Russian Far East, 405 glaciers with an estimated total mass of 49 Gt were reported in the 1970s. These have been retreating at an accelerated rate since the start of the 21st century. Because glacier studies in this region are scarce, ice loss and its influence on sea level rise and regional environments is poorly understood. In this study, we analyzed satellite data to quantify glacier mass change from 2000 to 2016 in six major glacier-covered regions on the peninsula. The mean rate of the glacier mass change over the study period was −0.46 ± 0.01 m w.e. a−1 (total mass change was −4.9 ± 0.1 Gt, −304.2 ± 9.1 Mt a−1), which is slightly lower than other regions in mid-latitude and subarctic zones. The mass loss accelerated from >−0.33 ± 0.02 m w.e. a−1 in the period 2000–2006/2010 to <−1.65 ± 0.12 m w.e. a−1 in 2006/2010–2015/16. The increase in mass loss is attributed to a rise in average decadal summer temperatures observed in the region (+0.68°C from 1987–99 to 2000–13). Moreover, a recent trend in Pacific decadal oscillation suggests future acceleration of mass loss due to a decline in winter precipitation.
  • Muqing Shi, Takayuki Shiraiwa, Humio Mitsudera, Yaroslav Muravyev
    JOURNAL OF HYDROLOGY-REGIONAL STUDIES 36 2021年08月 [査読有り]
     
    Study Region: Kamchatka Peninsula, Russian Federation.Study Focus: The strength of an overturning process of North Pacific sea water originating in the Sea of Okhotsk is determined by the sea water salinity in the area. Recent observations show that the overturning process is important to the entire North Pacific and is statistically related to the precipitation over the Kamchatka Peninsula (KP). This study uses estimations based on specific discharge and the Soil and Water Assessment Tool (SWAT) to verify and further explore the connection between the terrestrial freshwater discharge from KP and the overturning process.New Hydrological Insights for the Region: Previously inaccessible observed discharge data from 11 major rivers on the KP were obtained and analyzed for the first time. Based on the data we estimate annual discharge from the entire KP using the specific discharge and regression analysis, and we then simulate monthly discharge from the western KP using the SWAT model. Our result shows a significant negative correlation (r(2) = 0.36, p < 0.01) between the interannual variation of sea water salinity in the overturning process area, and the variation of annual freshwater discharge from the western KP, therefore successfully verifies that freshwater discharge from the western KP is a critical factor that affects the strength of the overturning process.
  • Yuto Tashiro, Muneoki Yoh, Takayuki Shiraiwa, Takeo Onishi, Vladimir Shesterkin, Vladimir Kim
    WATER 12 9 2020年09月 [査読有り]
     
    Dissolved iron (dFe) in boreal rivers may play an important role in primary production in high-latitude oceans. However, iron behavior in soils and dFe discharge mechanism from soil to the rivers are poorly understood. To better understand iron dynamics on the watershed scale, we observed the seasonal changes in dFe and Dissolved Organic Carbon (DOC) concentrations in the river as well as dFe concentration in soil pore waters in permafrost watershed from May to October. During snowmelt season, high dFe production (1.38-4.70 mg L-1) was observed in surface soil pore waters. Correspondingly, riverine dFe and DOC concentrations increased to 1.10 mg L-1 and 32.3 mg L-1, and both were the highest in the year. After spring floods, riverine dFe and DOC concentrations decreased to 0.15 mg L-1 and 7.62 mg L-1, and dFe concentration in surface soil pore waters also decreased to 0.20-1.28 mg L-1. In late July, riverine dFe and DOC concentrations increased to 0.33 mg L-1 and 23.6 mg L-1 in response to heavy rainfall. In August and September, considerable increases in dFe concentrations (2.00-6.90 mg L-1) were observed in subsurface soil pore waters, probably because infiltrated rainwater developed reducing conditions. This dFe production was confirmed widely in permafrost wetlands in valley areas. Overall, permafrost wetlands in valley areas are hotspots of dFe production and greatly contribute to dFe and DOC discharge to rivers, especially during snowmelt and rainy seasons.
  • Ambarish Pokhrel, Kimitaka Kawamura, Bhagawati Kunwar, Kaori Ono, Akane Tsushima, Osamu Seki, Sumio Matoba, Takayuki Shiraiwa
    ATMOSPHERIC CHEMISTRY AND PHYSICS 20 1 597 - 612 2020年01月 [査読有り]
     
    A 180m long (343 years) ice core was drilled in the saddle of Aurora Peak in Alaska (63.52 degrees N, 146.54 degrees W; elevation: 2825 m) and studied for biomass-burning tracers. Concentrations of levoglucosan and dehydroabietic and vanillic acids exhibit multidecadal variability, with higher spikes in 1678, 1692, 1695, 1716, 1750, 1764, 1756, 1834, 1898, 1913, 1966 and 2005 CE. Historical trends of these compounds showed enhanced biomass-burning activities in the deciduous broadleaf forests, boreal conifer forests, and/or tundra woodland and mountain ecosystems before the 1830s and after the Great Pacific Climate Shift (GPCS). The gradually elevated level of dehydroabietic acid after the GPCS is similar to p-hydroxybenzoic acid (p-HBA) from the Svalbard ice core, suggesting common climate variability in the Northern Hemisphere. The periodic cycle of levoglucosan, which seemed to be associated with the Pacific Decadal Oscillation (PDO), may be more involved with the longrange atmospheric transport than other species. These compounds showed significant correlations with global lowertropospheric temperature anomalies (GLTTAs). The relations of the biomass-burning tracers with the PDO and GLTTA in this study suggest that their emission, frequency and deposition are controlled by the climate-driven forces. In addition, historical trends of dehydroabietic and vanillic acids (burning products of resin and lignin, respectively) from our ice core demonstrate the Northern Hemispheric connections to the common source regions as suggested from other ice core studies from Svalbard, Akademii Nauk and Tunu Greenland in the Northern Hemisphere.
  • Takayuki Shiraiwa
    NIPPON SUISAN GAKKAISHI 83 6 1011 - 1011 2017年 [査読無し]
  • Yoh Yamashita, Akihide Kasai, Takayuki Shiraiwa, Yoshihisa Shirayama
    NIPPON SUISAN GAKKAISHI 83 6 1008 - 1008 2017年 [査読無し]
  • Hirotaka Sasaki, Sumito Matoba, Takayuki Shiraiwa, Carl S. Benson
    SOLA 12 287 - 290 2016年11月 [査読有り][通常論文]
     
    To quantify the atmospheric iron deposition on the northern North Pacific region, we measured concentrations of iron in ice cores drilled at Mount Wrangell, Alaska, in 2003 and 2004. The iron concentration profile from 1981 to 2003 showed seasonal peaks each spring. This variation was similar to the seasonal variation in the concentration of mineral dust in the atmosphere in the North Pacific region. The annual iron fluxes calculated from the ice core records ranged from 3.2 to 27.0 mg m(-2) yr(-1), and the temporal variation in the iron lux was significantly correlated with the frequency of severe dust storms occurrence on the East Asian continent (r = 0.65, p < 0.05) and the total number of Kosa days observed in Japan (r = 0.64-0.66, p < 0.05), but not with the precipitation amount in Alaska. We concluded that the amount of iron deposition onto the northern North Pacific is controlled mainly by the emission of dust from the east Asian continent and not by scavenging processes in Alaska.
  • Pingqing Fu, Kimitaka Kawamura, Osamu Seki, Yusuke Izawa, Takayuki Shiraiwa, Kirsti Ashworth
    ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS 3 10 351 - 358 2016年10月 [査読有り][通常論文]
     
    Biogenic secondary organic aerosol (SOA) is ubiquitous in the Earth's atmosphere, influencing climate and air quality. However, the historical trend of biogenic SOA is not well known. Here, we report for the first time the major isoprene- and monoterpene-derived SOA tracers preserved in an ice core from the Kamchatka Peninsula. Significant variations are recorded during the past 300 years with lower concentrations in the early-to-middle 19th century and higher concentrations in the preindustrial period and the present day. We discovered that isoprene SOA tracers were more abundant in the preindustrial period than the present day, while monoterpene SOA tracers stay almost unchanged. The causes of the observed variability are complex, depending on atmospheric circulation, changes in emissions, and other factors such as tropospheric oxidative capacity. Our data presents an unprecedented opportunity to shed light on the formation, evolution, and fate of atmospheric aerosols and to constrain the uncertainties associated with modeling their atmospheric concentrations.
  • Ambarish Pokhrel, Kimitaka Kawamura, Kaori Ono, Osamu Seki, Pingqing Fu, Sumio Matoba, Takayuki Shiraiwa
    ATMOSPHERIC ENVIRONMENT 130 105 - 112 2016年04月 [査読有り][通常論文]
     
    Monoterpene and isoprene secondary organic aerosol (SOA) tracers are reported for the first time in an Alaskan ice core to better understand the biological source strength before and after the industrial revolution in the Northern Hemisphere. We found significantly high concentrations of monoterpene- and isoprene-SOA tracers (e.g., pinic, pinonic, and 2-methylglyceric acids, 2-methylthreitol and 2-methylerythritol) in the ice core, which show historical trends with good correlation to each other since 1660s. They show positive correlations with sugar compounds (e.g., mannitol, fructose, glucose, inositol and sucrose), and anti-correlations with alpha-dicarbonyls (glyoxal and methylglyoxal) and fatty acids (e.g., C-18:1) in the same ice core. These results suggest similar sources and transport pathways for monoterpene- and isoprene-SOA tracers. In addition, we found that concentrations of C-5-alkene triols (e.g., 3-methyl-2,3,4-trihydroxy-1-butene, cis-2-methyl 1,3,4-trihydroxy-1-butene and trans-2-methyl-1,3,4-trihydroxy-1-butene) in the ice core have increased after the Great Pacific Climate Shift (late 1970s). They show positive correlations with a-dicarbonyls and fatty acids (e.g., C-18:1) in the ice core, suggesting that enhanced oceanic emissions of biogenic organic compounds through the marine boundary layer are recorded in the ice core from Alaska. Photochemical oxidation process for these monoterpene- and isoprene-/sesquiterpene-SOA tracers are suggested to be linked with the periodicity of multi-decadal climate oscillations and retreat of sea ice in the Northern Hemisphere. (C) 2015 Elsevier Ltd. All rights reserved.
  • 大西 健夫, 楊 宗興, 白岩 孝行, 長尾 誠也
    低温科学 74 13 - 20 北海道大学低温科学研究所 2016年 [査読有り][通常論文]
     
    アムール川流域からは高濃度の溶存鉄が供給され,オホーツク海の生物生産に深く関与していることが示唆されている.溶存鉄の生物地球科学的プロセスには未解明な点もあるが,流域というマクロな視点にもとづき経験的な生成量予測モデル構築に成功した.しかし,1990年代後半に溶存鉄濃度の急激な上昇が観測され,この要因は解明されていない.このメカニズム解明には複数の要因が関わっていると考えられるが,永久凍土の挙動が深く関わっている可能性が高い.観測とモデリングを通しての溶存鉄生成メカニズムの解明を考察する.
  • Yu Ohata, Takenobu Toyota, Takayuki Shiraiwa
    JOURNAL OF GLACIOLOGY 62 233 563 - 578 2016年 
    Lake-ice properties at Lake Abashiri, Hokkaido, Japan, were examined using field observations and a 1-D thermodynamic model to clarify formation processes at mid-latitudes subject to significant snowfall as well as moderate air temperature. At all lake sites examined, the ice comprised two distinct layers: a snow ice (SI) layer on top and a congelation ice (CI) layer below. The SI layer occupied as much as 29-73% of the total ice thickness, a much greater fraction than that reported for lakes at Arctic high latitudes. In the model, the CI growth rate was estimated using the traditional heat budget method, while the SI growth rate was calculated assuming the excessive snowfall from the isostatic balance is converted to SI by a snow compression rate (beta) with the surface melting rate added when the surface heat budget becomes positive. By tuning the value of beta to the observational results of SI thickness, the model outcome successfully reproduced the observational thicknesses of CI and SI, and the break-up date of the lake. Essentially, the model findings show how snow and its formation into SI reduce, by about half, the seasonal variability of total ice thickness.
  • Seki Osamu, Kawamura Kimitaka, Bendle James A. P, Izawa Yusuke, Suzuki Ikuko, Shiraiwa Takayuki, Fujii Yoshiyuki
    SCIENTIFIC REPORTS 5 2015年09月28日 [査読有り][通常論文]
  • 對馬 あかね, 的場 澄人, 白岩 孝行
    雪氷研究大会講演要旨集 2015 6 - 6 公益社団法人 日本雪氷学会/日本雪工学会 2015年
  • 大畑 有, 豊田 威信, 白岩 孝行
    雪氷研究大会講演要旨集 2015 33 - 33 公益社団法人 日本雪氷学会/日本雪工学会 2015年
  • Ambarish Pokhrel, Kimitaka Kawamura, Osamu Seki, Sumio Matoba, Takayuki Shiraiwa
    ATMOSPHERIC ENVIRONMENT 100 202 - 209 2015年01月 
    An ice core drilled at Aurora Peak in southeast Alaska was analyzed for homologous series of straight chain fatty acids (C-12:0-C-30:0) including unsaturated fatty acid (oleic acid) using gas chromatography (GC/FID) and GC/mass spectrometry (GC/MS). Molecular distributions of fatty acids are characterized by even carbon number predominance with a peak at palmitic acid (C-16:0, av. 20.3 +/- SD. 29.8 ng/g-ice) followed by oleic acid (C-18:1, 19.6 +/- 38.6 ng/g-ice) and myristic acid (C-14:0, 15.3 +/- 21.9 ng/g-ice). The historical trends of short-chain fatty acids, together with correlation analysis with inorganic ions and organic tracers suggest that short-chain fatty acids (except for C-12:0 and C-15:0) were mainly derived from sea surface micro layers through bubble bursting mechanism and transported over the glacier through the atmosphere. This atmospheric transport process is suggested to be linked with Kamchatka ice core SD record from Northeast Asia and Greenland Temperature Anomaly (GTA). In contrast, long-chain fatty acids (C-20.0-C-30:0) are originated from terrestrial higher plants, soil organic matter and dusts, which are also linked with GTA. Hence, this study suggests that Alaskan fatty acids are strongly influenced by Pacific Decadal Oscillation/North Pacific Gyre Oscillation and/or extra tropical North Pacific surface climate and Arctic oscillation. We also found that decadal scale variability of C-18:1/C-18:0 ratios in the Aurora Peak ice core correlate with the Kamchatka ice core SD, which reflects climate oscillations in the North Pacific. This study suggests that photochemical aging of organic aerosols could be controlled by climate periodicity. (C) 2014 Elsevier Ltd. All rights reserved.
  • Jun Nishioka, Takeshi Nakatsuka, Kazuya Ono, Yu. N. Volkov, Alexey Scherbinin, Takayuki Shiraiwa
    PROGRESS IN OCEANOGRAPHY 126 180 - 193 2014年08月 
    Comprehensive observations of the iron (Fe) distribution in the western Sea of Okhotsk were conducted and revealed the existence of two Fe transport processes in the sub-polar marginal sea. One transport process is Fe loading from the Amur River and transport by the East Sakhalin Current (ESC), and the other is Fe transport by the intermediate water (part of which was reported by Nishioka et al., 2007). Here, we report on quantitative evaluations of these two Fe transport processes. The surface dissolved Fe (Diss-Fe) and low salinity water distribution clearly indicate the influence of Fe discharge from the Amur River and the Fe that is transported by the East Sakhalin Current. The amounts of total dissolvable Fe (TD-Fe) and Diss-Fe that cross the surface of the northeast Sakhalin coastal area are estimated at 9.0 x 10(8) - similar to 1.3 x 10(9) g yr(-1) and 1.0 x 10(8) similar to 1.5 x 10(8) g yr(-1), respectively. Although the ESC surface transport system along the Sakhalin coast is effective, the length-scale estimation of TD-Fe transport indicated that only 1.5% of the Fe at the mouth of the Amur River reached 52 degrees N, which may be due to scavenging by biological particulates. High Fe anomalies were observed at the bottom of the continental shelf and the shelf break along the Sakhalin coast. The extremely low temperature and low N* water indicate that Fe resuspension due to the reducing properties of sediment occurred on the shelf and that the Fe was introduced to Dense Shelf Water (DSW) by tidal mixing. We estimate that the amounts of TD-Fe and Diss-Fe involved in the DSW on the continental shelf are 8.8 x 10(10) similar to 2.5 x 10(11) g yr(-1) and 2.3 x 10(9) - similar to 6.6 x 10(9) g yr(-1), respectively. Length-scale estimates of TD-Fe transport indicate that 20% of the TD-Fe on the continental shelf remained in the Kuril Basin; thus, the TD-Fe in the intermediate water was efficiently transported to the Kuril Basin. These results indicate that two orders of magnitude more Fe is derived from the continental shelf by the intermediate water than by surface water and that Fe is transported a greater distance by intermediate water than by the surface layer. Additionally, the Fe that reached the Kuril Straits was mixed by intensive tidal mixing and influenced the vertical profiles of the water columns on both sides of the Kuril Straits in the Kuril Basin and the Oyashio region. Our quantitative evaluation also indicates other Fe inputs around the Kuril Strait. (C) 2014 Elsevier Ltd. All rights reserved.
  • Tatsuru Sato, Takayuki Shiraiwa, Ralf Greve, Hakime Seddik, Erik Edelmann, Thomas Zwinger
    Climate of the Past 10 1 393 - 404 2014年02月 [査読有り][通常論文]
     
    An ice core was retrieved in June 1998 from the Gorshkov crater glacier at the top of the Ushkovsky volcano, in central Kamchatka. This ice core is one of only two recovered from Kamchatka so far, thus filling a gap in the regional instrumental climate network. Hydrogen isotope (δD) analyses and past accumulation reconstructions were conducted for the top 140.7 m of the core, spanning 1736-1997. Two accumulation reconstruction methods were developed and applied with the Salamatin and the Elmer/Ice firn-ice dynamics models, revealing a slightly increasing or nearly stable trend, respectively. Wavelet analysis shows that the ice core records have significant decadal and multi-decadal variabilities at different times. Around 1880 the multi-decadal variability of δD became lost and its average value increased by 6%. The multi-decadal variability of reconstructed accumulation rates changed at around 1850. Reconstructed accumulation variations agree with ages of moraines in Kamchatka. Ice core signals were significantly correlated with North Pacific sea surface temperature (SST) and surface temperature (2 m temperature). δD correlates with the North Pacific Gyre Oscillation (NPGO) index after the climate regime shift in 1976/1977, but not before that. Therefore, our findings imply that the ice core record contains various information on the local, regional and large-scale climate variability in the North Pacific region. Understanding all detailed mechanisms behind the time-dependent connections between these climate patterns is challenging and requires further efforts towards multi-proxy analysis and climate modelling.
  • Sumito Matoba, Kunio Shimbori, Takayuki Shiraiwa
    ANNALS OF GLACIOLOGY 55 68 83 - 87 2014年 [査読有り][通常論文]
     
    The Institute of Low Temperature Science at Hokkaido University conducted ice-core drilling in alpine glaciers in the northern North Pacific region to reconstruct climate change in this region for the past few hundred years. We drilled two ice cores in the Kamchatka Peninsula, Russia. An ice core with a length of 211 m was drilled on a glacier at the summit caldera of Ushkovsky mountain in 1998. A second core, with a length of 115 m (until bedrock was reached), was drilled on a glacier at the summit caldera of Ichinsky mountain in 2006. We drilled three further ice cores in Alaska, USA. Two ice cores with lengths of 50 and 212 m were drilled on a glacier at the summit caldera of Mount Wrangell in 2003 and 2004. The third ice core was drilled on the ice divide among three glaciers, Black Rapids, Trident and Susitna glaciers, which represent a flat saddle north of Aurora Peak in the Alaska Range. This paper details the field operations and characteristics of the different ice-drilling systems used and the problems encountered.
  • Nishioka Jun, Nakatsuka Takeshi, Watanabe Yutaka W, Yasuda Ichiro, Kuma Kenshi, Ogawa Hiroshi, Ebuchi Naoto, Scherbinin Alexey, Volkov Yuri N, Shiraiwa Takayuki, Wakatsuchi Masaaki
    GLOBAL BIOGEOCHEMICAL CYCLES 27 3 920 - 929 Amer geophysical union 2013年09月 [査読有り][通常論文]
     
    The subarctic Pacific is a high-nutrient low-chlorophyll (HNLC) region in which phytoplankton growth is broadly limited by iron (Fe) availability. However, even with Fe limitation, the western subarctic Pacific (WSP) has significant phytoplankton growth and greater seasonal variability in lower trophic levels than the eastern subarctic Pacific. Therefore, differences in Fe supply must explain the west-to-east decrease in seasonal phytoplankton growth. The Fe flux to the euphotic zone in the WSP occurs at a moderate value, in that it is significantly higher than its value on the eastern side, yet it is not sufficient enough to cause widespread macronutrient depletion, that is, HNLC status is maintained. Although we recognize several Fe supply processes in the WSP, the mechanisms that account for this moderate value of Fe supply have not previously been explained. Here we demonstrate the pivotal role of tidal mixing in the Kuril Islands chain (KIC) for determining the moderate value. A basin-scale meridional Fe section shows that Fe derived from sediments in the Sea of Okhotsk is discharged through the KIC into the intermediate water masses (similar to 800m) of the western North Pacific. The redistribution of this Fe-rich intermediate water by intensive mixing as it crosses the KIC is the predominant process determining the ratio of micronutrient (Fe) to macronutrients (e.g., nitrate) in subsurface waters. This ratio can quantitatively explain the differences in surface macronutrient consumption between the western and eastern subarctic, as well as the general formation and biogeochemistry of HNLC waters of the subarctic North Pacific.
  • Kimitaka Kawamura, Yusuke Izawa, Michihiro Mochida, Takayuki Shiraiwa
    GEOCHIMICA ET COSMOCHIMICA ACTA 99 317 - 329 2012年12月 
    We successfully detected biomass burning tracers including levoglucosan and vanillic, p-hydroxybenzoic and dehydroabietic acids in an ice core (153 m long, ca. 300 years old) taken from Ushkovsky ice cap (altitude, 3903 m), the Kamchatka Peninsula, Northeast Asia. Concentrations of total organic carbon (TOC) were also determined in the ice core. Levoglucosan, which is produced by pyrolysis of cellulose and hemicellulose and thus is a general tracer of biomass burning, showed sporadic peaks in the years of 1705, 1759, 1883, 1915, 1949 and 1972, with the largest peak in 1949. However, its concentrations did not show a systematic increase in the last century although the concentration peaks seemingly corresponded to the higher ambient temperatures in the northern high latitudes. In contrast, dehydroabietic acid, a specific tracer of the pyrolysis of conifer resin, showed a gradual increase from the early 1900s to 1990s with a significant peak in 1970. Contributions of dehydroabietic acid to TOC also showed an increasing trend for the 20th century. Similarly, vanillic and p-hydroxybenzoic acids presented higher concentrations in the last half-century with sporadic peaks in 1705, 1759 and 1949. This study showed that general biomass burning tracers such as levoglucosan have been sporadically transported over the glacier of the Kamchatka Peninsula. In contrast, the ice core record of dehydroabietic acid indicated that fires of boreal conifer forest have more frequently and increasingly occurred in Far East and Siberia during the last century and transported to the Northwestern Pacific. The present study demonstrates that organic tracers of biomass burning preserved in ice core could provide historical records of biomass burning and boreal forest fires. (C) 2012 Elsevier Ltd. All rights reserved.
  • 白岩 孝行
    日本地理学会発表要旨集 2012 100086 - 100086 公益社団法人 日本地理学会 2012年 
    オホーツク海と親潮の基礎生産に果たすアムール川の役割を評価するプロジェクトを実施した。その結果、世界最高位を誇るオホーツク海と親潮の基礎生産量は、アムール川流域に起源を持ち、アムール川によってオホーツク海に供給される溶存鉄によって支えられている可能性が高いことを発見した。溶存鉄は、植物プランクトンの光合成における硝酸還元に利用されており、その難水溶性のために外洋では一般に枯渇している。冬期の鉛直混合によって、海洋表層の栄養塩(N, P, Si)が豊富なオホーツク海や親潮は、アムール川起源の溶存鉄によって、春季に顕著なプランクトンブルームが発生することを確認した。これは、オホーツク海や親潮にとって、アムール川流域が”魚附林(うおつきりん)”であることを意味する。
  • 的場 澄人, 佐々木 央岳, 白岩 孝行
    日本地球化学会年会要旨集 58 244 - 244 日本地球化学会 2011年 
    近年行われた海洋への鉄散布実験の結果、北部北太平洋域の東西両海域において、鉄は一次生産の制限要因として重要であることが明らかになった。鉄の供給源については、下層からの鉛直的な供給と春先の黄砂の飛来によって大気を通してもたらさせる鉄フラックスの寄与が大きいと考えられているが、その寄与率について定量的な議論が十分なされていない。本研究では、アラスカの山岳氷河アイスコアから大気由来鉄の沈着量の経年変化を推定し、雪氷試料を用いた実験から黄砂から降水中に溶解する鉄量を求め、大気中の黄砂が海洋に湿性沈着したときに短期間で海洋環境に与えるインパクトを評価した。その結果、アイスコアから推定した鉄の年間沈着量は1993から2003年の平均で9.3 mg/m2 yrだった。アイスコアおよび札幌の積雪中に含まれる鉄の溶解度はそれぞれ10%,1.2%だった。
  • Takehiro Fukuda, Shin Sugiyama, Sumito Matoba, Takayuki Shiraiwa
    ANNALS OF GLACIOLOGY 52 58 138 - 142 2011年 
    As part of a deep ice-core drilling project, GPS and ice-radar measurements were made in the vicinity of Aurora Peak, Alaska, USA. Surface and bed elevation maps were obtained over an area of 400 m x 700 m, which includes the drilling site. Surface flow velocity was measured at 18 locations in the same area. The results showed that the drilling site was situated on a gentle north-south ridge with saddle-shaped surface geometry. The horizontal ice-flow velocity at the drilling site was <0.5 m a(-1) and the ice generally flowed eastward and westward along the surface slope. The glacier bed slopes to the east and has more complex topography than the ice surface. The drilling site was situated above a bedrock dip, with an ice thickness of 252 +/- 10 m. These data constitute important information for estimating the effect of ice flow to the ice core retrieved from the depth of up to 180.17 m.
  • Sumito Matoba, Takayuki Shiraiwa, Akane Tsushima, Hirotaka Sasaki, Yaroslav D. Muravyev
    ANNALS OF GLACIOLOGY 52 58 44 - 50 2011年 [査読有り][通常論文]
     
    The Sea of Okhotsk is the southernmost area in the Northern Hemisphere where seasonal sea ice is produced every year. The formation of sea ice drives thermohaline circulation in the Sea of Okhotsk, and this circulation supports the high productivity in the region. However, recent reports have indicated that sea-ice production in the Sea of Okhotsk is decreasing, raising concern that the decreased sea ice will affect not only circulation but also biological productivity in the sea. To reconstruct climatic changes in the Sea of Okhotsk region, we analyzed an ice core obtained from Ichinskaya Sopka (Mount Ichinsky), Kamchatka. We assumed that the remarkable negative peaks of delta D in the ice core were caused by expansion of sea ice in the Sea of Okhotsk. Melt feature percentage (MFP), which indicates summer snowmelt, showed high values in the 1950-60s and the mid-1990s-2000s. The high MFP in the 1950-60s was assumed to be caused by an increase in cyclone activity reaching Kamchatka during a negative period of the Pacific Decadal Oscillation index, and that in the 1990-2000s may reflect the increase in solar irradiation during a positive period of the summer Arctic Oscillation index.
  • 福田 武博, 杉山 慎, 白岩 孝行, 的場 澄人
    雪氷研究大会講演要旨集 2009 167 - 167 公益社団法人 日本雪氷学会/日本雪工学会 2009年
  • 的場 澄人, 對馬 あかね, 佐々木 央岳, Muravyev Yaroslav D., 白岩 孝行
    雪氷研究大会講演要旨集 2009 128 - 128 公益社団法人 日本雪氷学会/日本雪工学会 2009年
  • 佐々木 央岳, 的場 澄人, 白岩 孝行
    雪氷研究大会講演要旨集 2009 129 - 129 公益社団法人 日本雪氷学会/日本雪工学会 2009年
  • santibañez P., Kohshima S., Scheihing R., Jaramillo J., Shiraiwa Takayuki, Matoba Sumito, Kanda D., Labarca P., Casassa G.
    Journal of Glaciology 54 186 452 - 462 International Glaciological Society 2008年07月 
    The first analyses of biological components in glaciers of the Chilean lake district are presented based on microalgae biovolume, pollen and other microorganisms detected in shallow ( 10 m) firn/ice cores. Three cores were retrieved, two at Volca´n Mocho-Choshuenco (398550 S, 728020W; summit at 2422ma.s.l; east glacier at 2000ma.s.l.), and one at the summit of Volca´n Osorno (418060 S, 728300W; 2652ma.s.l.). Microalgae, protozoa and pollen quantified in the samples obtained from the two summit cores show clear fluctuations interpreted as seasonal signs. In contrast, dD and many chemical species from the summit cores show strong dampening at depth, probably due to water percolation. The limited information provided by isotopic and chemical analyses is used to support the seasonal interpretation of biological parameters from the summit cores, with microorganism maxima inferred to occur in summer and pollen maxima in spring. A good comparison is found between massbalance estimations from the Volca´n Mocho-Choshuenco summit core and values obtained near that site by means of the stake method. It is concluded that biological analyses of firn/ice cores provide reliable estimations of annual and seasonal markers from these temperate glaciers.
  • Syosaku Kanamori, Carl S. Benson, Martin Truffer, Sumito Matoba, Daniel J. Solie, Takayuki Shiraiwa
    JOURNAL OF GLACIOLOGY 54 185 273 - 278 2008年 
    We recorded the burial times of temperature sensors mounted on a specially constructed tower to determine snow accumulation during individual storms in the summit caldera of Mount Wrangell, Alaska, USA, (62 degrees N, 144 degrees W; 4100 m a.s.l.) during the accumulation year June 2005 to June 2006. The experiment showed most of the accumulation occurred in episodic large storms, and half of the total accumulation was delivered in late summer. The timing of individual events correlated well with storms recorded upwind, at Cordova, the closest Pacific coastal weather station (200 km south-southeast), although the magnitude of events showed only poor correlation. Hence, snow accumulation at Mount Wrangell appears to be a reflection of synoptic-scale regional weather systems. The accumulation at Mount Wrangell's summit (>2.5 m w.e.) exceeded the precipitation at Cordova. Although the direct relationship between accumulation of individual storms at the summit of Mount Wrangell and precipitation events at Cordova may be unique in the region, it is useful for interpreting ice cores obtained on Mount Wrangell. This is especially the case here because the high rate of accumulation allows high time resolution within the core.
  • Yamaguchi Satoru, Naruse Renji, Shiraiwa Takayuki
    JOURNAL OF GLACIOLOGY 54 184 125 - 130 International Glaciological Society 2008年 [査読有り][通常論文]
     
    Based on the field data at Koryto glacier, Kamchatka Peninsula, Russia, we constructed a one-dimensional numerical glacier model which fits the behaviour of the glacier. The analysis of meteorological data from the nearby station suggests that the recent rapid retreat of the glacier since the mid-20th century is likely to be due to a decrease in winter precipitation. Using the geographical data of the glacier terminus variations from 1711 to 1930, we reconstructed the fluctuation in the equilibriumline altitude by means of the glacier model.With summer temperatures inferred from tree-ring data, the model suggests that the winter precipitation from the mid-19th to the early 20th century was about 10% less than that at present. This trend is close to consistent with ice-core results from the nearby ice cap in the central Kamchatka Peninsula.
  • Teppei J. Yasunari, Takayuki Shiraiwa, Syosaku Kanamori, Yoshiyuki Fujii, Makoto Igarashi, Koji Yamazaki, Carl S. Benson, Takeo Hondoh
    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 112 D10 2007年05月 [査読有り][通常論文]
     
    [1] The North Pacific is subject to various seasonal climate phenomena and material circulations. Therefore intra-annual ice core data are necessary for an assessment of the climate variations. To assess past variations, a 50-m ice core was drilled at the summit of Mount Wrangell Volcano, Alaska. The dust number, tritium concentrations, and stable hydrogen isotope were analyzed. The period covered was from 1992 to 2002. We found that the concentrations of both fine dust (0.52 - 1.00 mu m), an indicator of long-range transport, and coarse dust (1.00 - 8.00 mu m) increased together every spring. Moreover, their concentrations increased drastically after 2000, corresponding to the recent increase in Asian dust outbreaks in spring. Additionally, an increase in the spring of 2001 corresponded to the largest dust storm recorded in east Asia since 1979. Therefore our findings imply that Asian dust strongly polluted Mount Wrangell every spring. The stratospheric tracer, tritium, had late spring maxima almost every year, and we found this useful for ice core dating to identify late spring in the North Pacific region. We also found that a high positive annual correlation existed between the calculated tritium and fine dust fluxes from late spring to summer. We propose that an annual relationship between the stratosphere-troposphere exchange and Asian dust storm are most closely connected in late spring because their activities are weak in summer. The Mount Wrangell ice core is important and useful for assessing the dust and tritium circulation in the distant past around the North Pacific with probable intra-annual timescale information.
  • 的場 澄人, Ushakov Sergey V., 新堀 邦夫, 樋口 和生, 佐々木 央岳, 山崎 哲秀, Ovshannikov Alexander A., Manevich Alexander G., Zhideleeva Tatyana M., Kutuzov Stanislav, Muravyev Yaroslav D., 白岩 孝行
    日本雪氷学会全国大会講演予稿集 2007 94 - 94 公益社団法人 日本雪氷学会 2007年
  • 佐々木 央岳, 的場 澄人, 白岩 孝行
    日本雪氷学会全国大会講演予稿集 2007 126 - 126 公益社団法人 日本雪氷学会 2007年
  • 金森 晶作, 白岩 孝行, 的場 澄人, 安成 哲平
    日本雪氷学会全国大会講演予稿集 2007 2 - 2 公益社団法人 日本雪氷学会 2007年
  • Thomas Zwinger, Ralf Greve, Olivier Gagliardini, Takayuki Shiraiwa, Mikko Lyly
    ANNALS OF GLACIOLOGY, VOL 45, 2007 45 29 - + 2007年 
    The Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, is characterized by a large aspect ratio and special thermodynamic conditions at the bedrock caused by a locally enhanced and spatially varying geothermal heat flux. Furthermore, large parts of this glacier consist of firn rather than pure ice, which alters the rheological properties (such as viscosity and compressibility) of the glacier. We present a newly developed, thermo-mechanically coupled, three-dimensional flow model based on the finite-element (FE) modeling software Elmer, and apply it to the Gorshkov crater glacier. By assuming steady-state conditions, the present-day velocity field, temperature field, basal melting rate and age distribution are simulated. We find that flow velocities are generally small (tens of centimeters per year). Horizontal and vertical velocities are of comparable magnitude, which shows that the shallow-ice approximation is not applicable. Owing to the spatially variable volcanic heat flux, the thermal regime at the ice base is cold in the deeper parts of the glacier and temperate in the shallower parts. The measured temperature profile and age horizons at the K2 borehole are reproduced quite well, and remaining discrepancies may be attributed to transient (non-steady-state) conditions. Firn compressibility is identified as a crucial element for the modeling approach.
  • 的場 澄人, 金森 晶作, Benson Carl, 白岩 孝行
    日本雪氷学会全国大会講演予稿集 2006 79 - 79 公益社団法人 日本雪氷学会 2006年
  • 戸井田 武, 白岩 孝行, 的場 澄人
    日本雪氷学会全国大会講演予稿集 2006 170 - 170 公益社団法人 日本雪氷学会 2006年
  • Shiro Kohshima, Nozomu Takeuchi, Jun Uetake, Takayuki Shiraiwa, Ryu Uemura, Naohiro Yoshida, Sumito Matoba, Maria Angelica Godoi
    Global and Planetary Change 59 236 - 244 2006年 [査読無し][通常論文]
     
    Snow algae in a 45.97-m-long ice core from the Tyndall Glacier (50°59′05″S, 73°31′12″W, 1756 m a.s.l.) in the Southern Patagonian Icefield were examined for potential use in ice core dating and estimation of the net accumulation rate. The core was subjected to visual stratigraphic observation and bulk density measurements in the field, and later to analyses of snow algal biomass, water isotopes (18O, D), and major dissolved ions. The ice core contained many algal cells that belonged to two species of snow algae growing in the snow near the surface: Chloromonas sp. and an unknown green algal species. Algal biomass and major dissolved ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-) exhibited rapid decreases in the upper 3 m, probably owing to melt water elution and/or decomposition of algal cells. However, seasonal cycles were still found for the snow algal biomass,18O, D-excess, and major ions, although the amplitudes of the cycles decreased with depth. Supposing that the layers with almost no snow algae were the winter layers without the melt water essential to algal growth, we estimated that the net accumulation rate at this location was 12.9 m a- 1from winter 1998 to winter 1999, and 5.1 m from the beginning of winter to December 1999. These estimates are similar to the values estimated from the peaks of18O (17.8 m a- 1from summer 1998 to summer 1999 and 11.0 m from summer to December 1999) and those of D-excess (14.7 m a- 1from fall 1998 to fall 1999 and 8.6 m a- 1from fall to December 1999). These values are much higher than those obtained by past ice core studies in Patagonia, but are of the same order of magnitude as those predicted from various observations at ablation areas of Patagonian glaciers. © 2006 Elsevier B.V. All rights reserved.
  • 白岩 孝行
    日本地すべり学会誌 41 2 198 - 201 The Japan Landslide Society 2004年
  • Regional characteristics of surface snow chemistry at East Dronning Maud Land, Antarctica
    Motoyama, H, K. Kamiyama, T. Shiraiwa, T. Saito, T. Kameda, N. Azuma, S. Fujita, Y. Fujii, K. Suzuki, T. Yamada, T. Suzuki, Y. Iizuka, T. Furukawa, K. Nishimura, S. Kanamori, O. Watanabe
    Seventh International Symposium on Antarctic Glaciology 11  2003年08月01日 [査読無し][通常論文]
  • Hondoh Takeo, Narita Hideki, Hori Akira, Ikeda-Fukazawa Tomoko, Fujii-Miyamoto Michiko, Ohno Hiroshi, Shiraiwa Takayuki, Mae Shinji, Fujita Shuji, Fukazawa Hiroshi, Fukumura Taku, Shoji Hitoshi, Kameda Takao, Miyamoto Atsushi, Azuma Nobuhiko, Wang Yun, Kawada Kunio, Nishio Fumihiko, Motoyama Hideaki, Watanabe Okitsugu
    Memoirs of National Institute of Polar Research, Special Issue 57 63 - 71 2003年03月 [査読有り][通常論文]
     
    Recent results of physical analyses of the Dome Fuji ice core are summarized with special attention to new methods introduced in the present studies.Microphysical processes which affect the ice core records are reviewed to better understand the paIeoclimatic and paleoenvironmental signals stored.
  • Study of physical properties of ice cores and ice sheet dynamics, Deep ice coring project at Dome Fuji
    Takeo Hondoh, Hideki Narita, Takayuki Shiraiwa, Tomoko Ikeda-Fukazawa, Michiko Fujii, Hiroshi Ohno, Shinji Mae, Hiroshi Fukazawa, Taku Fukumura, Nobuhiko Azuma, Yun Wong, Hitoshi Shoji, Takao Kameda, Atsushi Miyamoto, Kunio Kawada, Ayako Abe, Fuyuki Saito, Okitsugu Watanabe, Hideaki Motoyama
    Antarctica Progress Report 2002 17-21  2002年01月 [査読無し][通常論文]
  • Fuji, Y, N. Azuma, Y.Tanaka, Y. Nakayama, T. Kameda, K. Shinbori, K. Katagiri, S. Fujita, A. Takahashi, K. Kawada, H. Motoyama, H. Narita, K. Kamiyama, T. Furukawa, S. Takahashi, H. Shoji, H. Enomoto, T. Saitoh, M. Miyahara, R. Naruse, T. Hondoh, T. Shiraiwa, K. Yokoyama, Y. Ageta, T. Saito, O. Watanabe
    Memoirs of National Institute of Polar Research, Special Issue, 56 56 103 - 116 2002年 [査読有り][通常論文]
     
    Deep ice core drilling was carried out at Dome Fuji, Antarctica in 1995 and 1996 from the bottom of the casing installed in 1993 and reached 2503.52m in December 1996. We used a JARE type electromechanical drill with a core barrel of 2.2m length. Total numbers of ice corings and chip collections were 1369 and 837 respectively. The mean coring depths per run and per day were 1.75m and 8.21m, respectively. Quality of ice cores was perfect throughout the whole depth, even in the brittle zone. We report the outline of the system, coring performance, and troubles encountered.
  • Takayuki Shiraiwa, Yaroslav D. Murav'yev, Takao Kameda, Fumihiko Nishio, Yoko Toyama, Akiyoshi Takahashi, Alexander A. Ovsyannikov, Andrey N. Salamatin, Kotaro Yamagata
    Journal of Glaciology 47 158 423 - 432 2001年 [査読有り][通常論文]
     
    A glacier at the summit of Ushkovsky volcano, Kamchatka peninsula, Russia, was studied in order to obtain information about the physical characteristics of a glacier that fills a volcanic crater. The glacier has a gentle surface and a concave basal profile with a maximum measured depth of 240 m at site of K2. The annual accumulation rate was 0.54 m a-1 w.e., and the 10 m depth temperature was-15.8°C. A 211.70 m long ice core drilled at K2 indicates that (1) the site is categorized as a percolation zone, (2) the stress field in the glacier changes at 180 m depth from vertical and longitudinal compression with transversal extension, which is divergent flow, to a shear-dominated stress field, and (3) the frequent occurrence of ash layers can be a good tool for dating the ice core. The borehole temperature profiles were considered to be non-stationary, but the linear profile made it possible to estimate the basal temperature and the geothermal heat flux at K2. Assuming constant surface and the basal boundary conditions, we constructed two depth-age relationships at K2. These predicted that the bottom ages of the ice core were about 511 or 603 years.
  • Y Iizuka, H Satake, T Shiraiwa, R Naruse
    JOURNAL OF GLACIOLOGY 47 157 223 - 231 2001年 [査読有り][通常論文]
     
    Debris-laden basal ice is exposed along an ice cliff near Hamna Glacier, Soya Coast, East Antarctica. The basal ice is about 6.8 in thick and shows conspicuous stratigraphic features. The upper 5.5 in consists of alternating layers of bubble-free and bubbly ice. delta values of the bubble-free ice layers are enriched by 2.4 +/- 1.0 parts per thousand (standard deviation) for delta O-18 compared to values of neighboring bubbly ice layers above, and slopes of delta O-18 vs deltaD are close to 8. Such layers are suggested to have been formed by refreezing of meltwater in an open system. In contrast, part of the bubbly ice layers shows neutral profiles for stable isotopes, suggesting that these ice masses are undisturbed ice-sheet ice which was not affected by melting and freezing. The massive alternating layers are thus considered to have been formed by folding of refrozen and non-melted layers. The lower 1.3 m consists predominantly of bubble-free massive ice. The profile of co-isotopic values shows a change of about 3.0 parts per thousand for delta O-18 at the interface between bubble-free and bubbly ice. Since the isotopic change occurred over a wider thickness than the upper 5.5 in, the basal ice is suggested to have been formed by refreezing of meltwater on a larger scale than the upper 5.5 m.
  • Iizuka Yoshinori, Igarashi Makoto, Shiraiwa Takayuki, Naruse Renji, Yamada Tomomi, Watanabe Okitsugu
    Polar meteorology and glaciology 14 8 - 15 国立極地研究所 2000年 [査読有り][通常論文]
     
    Debris-laden basal ice is exposed along an ice cliff (about 30m high) near Hamna Icefall, Soya Coast, East Antarctica. The basal ice about 6.8m thick can be divided into an upper part (5.5m) and a lower part (1.3m) based on stratigraphic features. Major dissolved ions of the basal ice are probably composed of eight species (Na^+, K^+, Mg^<2+>, Ca^<2+>, Cl, SO_4^2,NO_3 and HCO_3). Almost all Na^+, K^+, Mg^<2+>, Ca^<2+>, SO_4^2 and HCO_3 in the basal ice are considered to have originated from chemical erosion of rock minerals at the base of the ice sheet. According to a calculation of ion composition, the primary rock mineral dissolved in the basal ice is considered to be carbonate.
  • H Enomoto, H Motoyama, T Shiraiwa, T Saito, T Kameda, T Furukawa, S Takahashi, Y Kodama, O Watanabe
    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 103 D18 23103 - 23111 1998年09月 [査読有り][通常論文]
     
    An abrupt warming was observed in the winter around Dome Fuji (3810 m above sea level (asl)) in East Antarctica. The air temperature increased from -73 degrees C to -36 degrees C in two days, from June 13 to 14, 1994. Warming occurred first in the coastal region near the Lambert Glacier, East Antarctica, then progressed inland to Dome Fuji. During the warming, a blocking high was observed in the middle troposphere and it persisted for several weeks. This circulation pattern brought warm air inland. A blocking high over East Antarctica also appeared in the upper troposphere; this high-pressure area corresponded to a ridge of stratospheric circulation. This condition occurred after a displacement of the polar vortex from East Antarctica to West Antarctica. Warming at the surface of the ice sheet occurred suddenly; however, in the stratosphere the circulation pattern began to change on a seasonal scale prior to the warming as part of the first phase of the semiannual oscillation.
  • Preliminary report on analysis of melted Dome Fuji ice core obtained in 1993
    O. Watanabe, K. Kamiyama, H. Motoyama, M. Igarashi, S. Matoba, T. Shiraiwa, T. Yamada, H. Shoji, S. Kanamori, N. Kanamori, M. Nakawo, Y. Ageta, S. Koga, K. Satow
    Proc. of the NIPR Symp. Polar Meteorol. and Glaciol. 11 14 - 23 1997年 [査読有り][通常論文]
  • Kameda, T, S. Takahashi, H. Enomoto, N. Azuma, T. Shiraiwa, Y. Kodama, T. Furukawa, O. Watanabe, G. A. Weidner, C. R. Stearns
    Proc. NIPR Symp. Polar Meteorol. Glaciol. 11 11 35 - 50 国立極地研究所 1997年 [査読有り][通常論文]
     
    This paper focuses on instrumentation and observational results of eight Automatic Weather Station (AWS) units in East Queen Maud Land, Antarctica 1995. The AWS units were installed at six sites on the ice sheet from coast to inland : the site nearest to the coast (H21) was located at 60km at 1076m altitude and a site farthest from the coast (Dome Fuji Station) was located about 920km inland at 3810m altitude. Two types of AWS units (CMOS and ARGOS) were employed. Air temperatures at H21 and Dome Fuji Station change from +2.3 to -44.4℃ and -23.3 to -80.1℃, respectively. Monthly mean July temperatures in eight AWS data are systematically higher than June and August temperatures, respectively. During the period of temperature increase in July, atmospheric pressure also increased. Wind speed during the whole period could only be obtained at MD180 at which glazed surface was observed. Prevailing wind (south-east : SE) at Relay Point covers 40% of the total wind direction, and wind from the east north-east slightly prevails (11%) at Dome Fuji Station. Atmospheric pressure at Relay Point drops in May and September, and increases in July and December. Monthly mean lapse rates on snow surface were calculated using AWS data. Annaul mean lapse rates obtained by the AWS data were systematically lower than that obtained by 10m snow temperatures in Mizuho Plateau. Increase of temperature difference between air and snow surface with altitude will be a reason for the phenomenon.
  • 白岩 孝行, 曽根 敏雄
    地学雑誌 105 2 Plate3 - Plate5 Tokyo Geographical Society 1996年

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その他活動・業績

  • 西岡純, 三寺史夫, 白岩孝行, 関宰, 中村知裕, 的場澄人, 江淵直人 低温科学 74 175 -180 2016年03月31日 [査読無し][通常論文]
     
    日本は,オホーツク海,日本海,東シナ海といった「縁辺海」と「北太平洋」に面しており,太平洋からみると縁辺海と大洋を隔てる列島の一部である.さらにベーリング海を含めたこれら北太平洋の縁辺海は,自然科学的視点からみても,人間活動の場として見ても多くの共通性と特異性を持ち合わせている.これらのすべての縁辺海には,大河川や,規模は小さいが数多くの中・小河川が流れ込むことで,陸域の影響が大きく現れる.これら河川を通じて陸からの物質を受け取り,縁辺海内部で起こる様々な物理的プロセスと生物的・化学的反応を介して物質循環が活発に起こっている場所である.これらの各縁辺海は,陸域の影響を大洋に伝える間の緩衝作用も担うと同時に,大洋の影響も強く受け,物質的にも暖流(黒潮)や寒流(親潮)で結ばれている.縁辺海の自然科学的な機能を明らかにすることは,東シナ海,日本海,オホーツク海を経由して,北太平洋へと至る,長大な物質循環システムを理解することに繋がる.本稿では,環オホーツク域の「陸海結合システム」という概念に焦点を当て,環オホーツク域で進めてきた研究で残されている課題と,日本の周辺領域も含めたさらに大きなスケールで陸海結合システムをとらえるための研究展開について記す.Linkage between land and ocean is one of important issue for understanding earth system, and marginal seas are a key place for this linkage. The South China Sea, the East China Sea, the Japan Sea, the Sea of Okhotsk and the Bering Sea are marginal seas located on the north/west rim of the Pacific Ocean. These marginal seas received strong influence from the land via large and small scale river discharge, which include human influence. The marginal seashave high productivity and active biogeochemical cycles relative to those in oceanic regions, which are controlled by individual local processes, such as fresh water discharge, interior current systems, tidal mixing, local upwelling, continental shelves interactions, sea ice production/melting, and flows through straits. Further, recent studies indicated that some of the marginal seas strongly influence to the Pacific Ocean on physical and biogeochemicalprocesses. Therefore, clarifying roles of the marginal seas for linkage between land and oceanic region is one of the major remaining issue for understanding whole Pacific Ocean. In this paper, we discuss remaining issue to understand not only pan-Okhotsk biogeochemical system but also the role of Pacific marginal seas in linking adjacent land with ocean.
  • 佐藤 建, 白岩 孝行, Greve Ralf, Zwinger Thomas, Seddik Hakime 雪氷研究大会講演要旨集 2009 (0) 192 -192 2009年 [査読無し][通常論文]
  • 福田武博, 杉山 慎, 白岩孝行, 的場澄人 北海道の雪氷 28 69 -72 2009年 [査読無し][通常論文]
  • 安成 哲平, 白岩 孝行, 的場 澄人, 佐々木 央岳, 東 久美子 大会講演予講集 94 153 -153 2008年
  • 白岩 孝行 雪氷 69 (5) i -ii 2007年09月15日
  • 白岩 孝行 低温科学 65 57 -65 2007年03月23日 
    北部北太平洋の両岸にそびえる高山には寒冷氷河が発達し、過去数百年から千年程度の古気候・古環境情報が冷凍保存されている。カムチャッカ半島のウシュコフスキー山、アメリカ合衆国アラスカ州のランゲル山、カナダ・ユーコン準州のローガン山の3地点で全長200m を越す雪氷コアを掘削し、その物理特性を明らかにし、これらの3本のコアが有力な気候代替記録を有している可能性を示した。特にウシュコフスキー山のコアからは、過去 170年間の気温と降水量に関する気候代替記録を得た。また、既存のローガン山の気候代替記録とウシュコフスキー山の記録を比較したところ、両者には負の相関が認められ、北太平洋十年振動(PDO)との関連が示唆された。
  • Matoba Sumito, Ushakov Sergey V., Shimbori Kunio, Sasaki Hirotaka, Yamasaki Tetsuhide, Ovshannikov Alexander A., Manevich Alexander G., Zhideleeva Tatyana M., Kutuzov Stanislav, Muravyev Yaroslav D., Shiraiwa Takayuki Bulletin of Glaciological Research 24 79 -85 2007年01月 
    During summer 2006, we carried out ice-core drilling to bedrock on a glacier at the summit of Mount Ichinsky, Kamchatka, Russia, and recovered a 115-m-long ice core. We also prepared samples, performed ice-core analyses in-situ, and measured the borehole temperature. The temperature of the borehole was -13℃ at 10m depth, and the pore close-off depth was 25m. The melt-feature percentage, or the thickness of frozen ice layers in a 1-m-long section of ice core, varied from 10% to 100%. These ice layers were formed by both rainfall, surface melting, and frost on the glacier surface, which we observed during our expedition. We hypothesize that the fluctuations in the proportion of ice layers show climatic variation in Kamchatka.
  • Teppei J. Yasunari, Takayuki Shiraiwa, Syosaku Kanamori, Yoshiyuki Fujii, Makoto Igarashi, Koji Yamazaki, Carl S. Benson, Takeo Hondo Journal of Geophysical Rersearch 112 (D10) D10208 2007年 [査読無し][通常論文]
  • 白岩 孝行, 的場 澄人 雪氷 68 (4) 315 -317 2006年07月15日
  • 安成 哲平, 山崎 孝治, 白岩 孝行, 五十嵐 誠, Benson Carl S., 金森 晶作, 藤井 理行, 本堂 武夫 大会講演予講集 90 270 -270 2006年
  • 佐藤 建, 白岩 孝行, 的場 澄人 日本雪氷学会全国大会講演予稿集 2006 (0) 101 -101 2006年 [査読無し][通常論文]
  • 安成 哲平, 白岩 孝行, Benson Carl S, 山崎 孝治, 金森 晶作, 藤井 理行, 五十嵐 誠, 本堂 武夫 大会講演予講集 88 (0) 443 -443 2005年10月31日 [査読無し][通常論文]
  • 安成 哲平, 白岩 孝行, 金森 晶作, Benson Carl S, 山崎 孝治, 藤井 理行, 五十嵐 誠, 本堂 武夫 大会講演予講集 87 (0) 263 -263 2005年04月30日 [査読無し][通常論文]
  • 安成 哲平, 本堂 武夫, 白岩 孝行, Benson Carl S, 金森 晶作, 藤井 理行, 五十嵐 誠, 山崎 孝治, 青木 輝夫, 杉浦 幸之助 大会講演予講集 86 (0) 425 -425 2004年10月 [査読無し][通常論文]
  • 朝日 克彦, 渡辺 悌二, 白岩 孝行 日本地理学会発表要旨集 = Proceedings of the General Meeting of the Association of Japanese Geographers (66) 193 -193 2004年09月10日
  • 白岩 孝行 日本地すべり学会誌 : 地すべり = Journal of the Japan Landslide Society : landslides 41 (1) 79 -82 2004年05月25日
  • 白岩 孝行, 竹内 望, 東 久美子 日本雪氷学会全国大会講演予稿集 2004 (0) 108 -108 2004年 [査読無し][通常論文]
  • 東 久美子, 白岩 孝行, 的場 澄人, 瀬川 高弘, 金森 晶作, 藤井 理行, 山崎 哲秀 Bulletin of glaciological research 20 65 -72 2003年02月01日
  • 白岩 孝行, 東 久美子, 的場 澄人, 山崎 哲秀, 瀬川 高弘, 金森 晶作, 松岡 健一, 藤井 理行 Bulletin of glaciological research 20 57 -63 2003年02月01日
  • 山口悟, 成瀬廉二, 白岩孝行 日本雪氷学会全国大会講演予稿集 2002 167 2002年09月20日 [査読無し][通常論文]
  • 白岩孝行, 山口悟 地学雑誌 111 (4) 476 -485 2002年08月25日 [査読無し][通常論文]
     
    More than 400 glaciers exist in the mountains of Kamchatka Peninsula and they constitute the southern boundary of present-day glacierization along the eastern coast of the Eurasian continent. The mass balances of the glaciers are characterized by decadal and interdecadal oscillations, and they are closely related to those observed in the glaciers of Pacific North America. A negative relation was also found for the net accumulation timeseries reconstructed by ice cores from Ushkovsky Volcano, Kamchatka, and Mt. Logan, Canada, for the last 170 years. Because the oscillations of the net accumulation rate and the average annual &delta; <SUP>18</SUP>O reconstructed from Ushkovsky-ice-core seem to be closely correlated with the so-called Pacific Decadal Oscillation (PDO) Index, it was suggested that the mass balances of the glaciers at both sides of the North Pacific had been affected not only by global warming trends but also by the interdecadal climate variability that had dominantly been occurring over the North Pacific.
  • Kohshima Shiro, Shiraiwa Takayuki, Godoi Maria Angelica, Kubota Keiji, Takeuchi Nozomu, Shinbori Kunio Memoirs of National Institute of Polar Research. Special issue 56 49 -58 2002年03月 
    A 45.97m-deep drilling operation was carried out during November/December 1999 on the accumulation area of Tyndall glacier (50°59′05″S, 73°31′12″W, 1756m a. s. l.) at the southern end of the Southern Patagonia Icefield. A portable electromechanical drilling system was developed for ice-coring on temperate glaciers which often have aquifers near the pore-close off depths. The firn-core obtained was subjected to visual stratigraphic observations and bulk-density measurements. Preliminary results suggest an extremely high accumulation rate (about 12-14m a^<-1> w. e.) at the drilling site. The drilling operation was strenuous because of the continuous strong wind and enormous snowfall which forced the members to survive for nearly three weeks in a snow cave before evacuation.
  • 白岩 孝行, 山田 知充, 高橋 修平, 藤井 理行, KONONOV Y., ANANICHEVA M. D., KOREISHA M. M., MURAVYEV Y. D. 日本地理学会発表要旨集 = Proceedings of the General Meeting of the Association of Japanese Geographers 61 122 -122 2002年03月01日
  • SALAMATIN Andrey N., 白岩 孝行, MURAVYEV Yaroslav D., ZIGANSHIN Marat F. Bulletin of glaciological research 19 47 -52 2002年02月01日
  • 山田 知充, 高橋 修平, 白岩 孝行, 藤井 理行, KONONOV Yuriy, ANANICHEVA Maria D., KOREISHA Michael M., MURAVYEV Yaroslav D., SAMBORSKY Taras Bulletin of glaciological research 19 101 -106 2002年02月01日
  • T Shiraiwa, S Kohshima, R Uemura, N Yoshida, S Matoba, J Uetake, MA Godoi ANNALS OF GLACIOLOGY, VOL 35 35 84 -90 2002年 [査読無し][通常論文]
     
    A 45.97 in long ice core was recovered in the accumulation area of Glaciar Tyndall (50degrees59'05" S, 73degrees31'12" W, 1756 in a.s.l.), Campo de Hielo Patagonico Sur (southern Patagonia icefield), during December 1999. The firn core was subjected to visual stratigraphic observation and bulk density measurements in the field, and later to analyses of water isotopes (delta(18)O, deltaD), major dissolved ions and snow algal biomass. The drillhole remained dry down to about 43 in depth, where a water-soaked layer appeared. Seasonal cycles were found for delta(18)O, deltaD and the D-excess, although the amplitudes of the cycles decreased with depth. Major dissolved ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-) and algal biomass exhibit rapid decreases in the upper 3 in, probably due to meltwater elution. Annual increments defined by the 518 0 and D-excess peaks suggest that the minimum net accumulation rates at this location were 17.8 in a(-1) in 1997/98-1998/99 and > 11.0 in a(-1) in 1998/99-1999/2000. These are much higher values than those previously obtained from past ice-core studies in Patagonia, but are of the same order of magnitude as those predicted from various observations in ablation areas of Patagonian glaciers.
  • 竹内 望, 幸島 司郎, 白岩 孝行, 久保田 敬二 Bulletin of glaciological research 18 65 -69 2001年03月01日
  • 山口悟, 成瀬廉二, 白岩孝行 日本雪氷学会全国大会講演予稿集 2000 93 2000年09月20日 [査読無し][通常論文]
  • 藤井 理行, 東 信彦, 田中 洋一, 高橋 昭好, 新堀 邦夫, 本山 秀明, 片桐 一夫, 藤田 秀二, 宮原 盛厚, 中山 芳樹, 亀田 貴雄, 斎藤 隆志, 斎藤 健, 庄子 仁, 白岩 孝行, 成田 英器, 神山 孝吉, 古川 晶雄, 前野 英生, 榎本 浩之, 成瀬 廉二, 横山 宏太郎, 本堂 武夫, 上田 豊, 川田 邦夫, 渡辺 興亜 南極資料 43 (1) 162 -210 1999年03月 [査読無し][通常論文]
     
    南極ドームふじ観測拠点において, 1993年パイロット孔の掘削とケーシングが行われたのに引き続き, 1995年から2カ年にわたり本格的な深層コア掘削が進められ, 1996年12月に2503.52m深に達した。本掘削におけるコア掘削の総回数は1369回, チップ回収作業は837回に及んだ。1回の平均コア掘削長は1.75m, 一日の平均コア掘削長は8.21mであった。本報告では, 現地で使用された掘削システムの概要とともに, 掘削の経過, および掘削の方法を述べるとともに, 掘削中に生じたさまざまなトラブルについても取られたその対策とともに報告し, 併せて今後の課題を示した。Deep ice coring was carried out at Dome Fuji Station, Antarctica in 1995 and 1996 following a pilot borehole drilled and cased with FRP pipes in 1993,and reached 2503.52m in December 1996. Total numbers of ice coring runs below the pilot borehole and chip collection were 1369 and 837 respectively. The mean coring depths per run and per day were 1.75m and 8.21m respectively. We report the outline of the coring operation, the system, coring method, and troubles encountered during the coring work.
  • 白岩 孝行, 西尾 文彦, 亀田 貴雄, 高橋 昭好, 戸山 陽子 雪氷 61 (1) 25 -40 1999年 [査読無し][通常論文]
  • Geophysical and paleoclimate implications of the Ushkovsky ice cap in Kamchatka ( jointly authored)
    Cryospheric Studies in Kamchatka (]G0002[) 8 -19 1999年 [査読無し][通常論文]
  • SHIRAIWA T. Seppyo 61 (1) 25 -40 1999年 [査読無し][通常論文]
  • T Watanabe, L Dali, T Shiraiwa GEOMORPHOLOGY 26 (1-3) 185 -197 1998年12月 [査読無し][通常論文]
     
    The onset and termination of the formation of debris cones and the rate of denudation of source areas were studied in the Langtang Valley, central Nepal Himalaya. A stereo photogrammetric analysis was employed to map a detailed topography of debris cones, through which the volume of 19 cones was calculated. Debris cones were classified into four types (types 1-4) based on the criteria, such as incision of a toe, sizes of a cone and surface boulders, altitudinal distributions and vegetation cover. Cones of types 1-3 had been formed after deglaciation following the Langtang stage (3310 years BP). Type 1 cones are characterized by incision of toes by glaciers of the Lirung and Yala stages. The formation of the type 1 cones terminated well before 2000 years BP, Radiocarbon dates of charcoal fragments and buried soils show the major period of formation of the type 2 cones from 3300 to 2000 years BP. The rate of sedimentation calculated near the toe of cone 3 has been reduced in the last 5 centuries from 30.0 cm/100 years to 5.5 cm/100 years. The large amount of denudation of source areas (116.9-132.5 m) indicates that slope failures initiated the formation of type 3 cones. The development of type 4 cones made less of a contribution to landscape evolution in the valley. The rates of denudation for source areas were calculated except for those above type 3 cones. The average rates are 15.6-6.2 mm/year (above type 1 cones), 3.2 mm/year (type 2 cones) and 3.4 mm/year (type 4 cones). Debris cones of types 2 and 3 are located on the valley floors which are completely deglaciated. Those of types 1 and 4, on the other hand, are located by the large valley glaciers with debris cover. The formation of type 1 cones is important especially in terms of debris supply to moraines and supra-glacial debris in the upper valley. (C) 1998 Elsevier Science B.V. All rights reserved.
  • 白岩孝行, MURAVYEV Y D, 松岡健一, SALAMATIN A N, 堀川信一郎, 山口悟, OVSYANNIKOV A A, 藤川哲弥, 田中教幸 日本雪氷学会全国大会講演予稿集 1998 192 1998年09月 [査読無し][通常論文]
  • Matsumoto Takane, Kodama Yuji, Shiraiwa Takayuki, Yamaguchi Satoru, Sone Toshio, Nishimura Kouichi, Muravyev Yaroslav D., Khomentovsky Peter A., Yamagata Kotaro 低温科学. 物理篇. 資料集 56 53 -68 1998年03月 
    カムチャッカ半島における山岳地域の気候的な特徴、とくに東西断面での気候条件の違いを明らかにするため、カムチャッカ半島の高山地域3ヶ所(カレイタ氷河、ウシュコフスキー火山、コズイレフカ山地)に自動気象観測装置(AWS)を設置した。観測は、1996年7月から1997年9月までの期間に行われた。これらのAWS観測によって得られたデータを報告する。
  • 山口 悟, 白岩 孝行, 成瀬 廉二 雪氷 60 (4) 279 -287 1998年 [査読無し][通常論文]
  • Distribution and short-term Variations of flow velocities at Koryoto Glacier in the Kronotsky Peninsula, Kamchatka, Russia
    Bulletin of Glacier Research 16 51 -56 1998年 [査読無し][通常論文]
  • ENOMOTO H. H. J. Geophys. Res. 103 (D18) 23103 -23111 1998年 [査読無し][通常論文]
  • Automatic weather station program during Dome Fuji Project by JARE in east Droning Maud Land, Antarctica (jointly authored)
    Annals of Glaciology (27) 528 -534 1998年 [査読無し][通常論文]
  • T Shiraiwa, YD Muravyev, S Yamaguchi ARCTIC AND ALPINE RESEARCH 29 (4) 414 -421 1997年11月 [査読無し][通常論文]
     
    Field observations were conducted at the summit ice cap of the Ushkovsky volcano, central Kamchatka, in the summer of 1996, in order to evaluate the potential of the ice cap for reconstruction of the past climate over Kamchatka. A 27-m-long firn-core contains an approximate 27-yr record of net balance with an average accumulation rate of 0.57 m a(-1) water equivalent. The temperature of the firn is -16.5 degrees C at 10-m depth. Average annual accumulation rates are calculated by reference to dated ash layers and amount to between 0.38 and 0.88 m a(-1) during six fixed periods. Depth and age of pore close-off are calculated as 58 m and 66 yr at this site by empirical formulas. Comparisons of the accumulation rates with winter precipitation at lowland stations indicate that there is a positive relationship with winter precipitation on the eastern and western coasts of the peninsula. We cannot find a clear relation between the rates and annual average sea-ice extent in the Sea of Okhotsk. which implies the vapor source to the ice cap could have been the North Pacific. Melt feature percentage in the firn core displays a clear positive relationship with summer air temperature at 700 hPa ever Kamchatka. The result obtained suggests that the ice cap has potential for the reconstruction of paleoclimate over the Kamchatka Peninsula.
  • 高橋 修平, 榎本 浩之, 亀田 貴雄, 白岩 孝行, 児玉 裕二, 藤田 秀二, 本山 秀明, 渡邉 興亜, WEIDNER G. A, STEARNS C. R 大会講演予講集 72 P301 1997年10月 [査読無し][通常論文]
  • 松岡健一, 白岩孝行, 浦塚清峰, 大井正行, 前野英生, 堀川信一郎, 山口悟, MURAVYEV Y, D, 前晋爾 日本雪氷学会全国大会講演予稿集 1997 183 1997年09月 [査読無し][通常論文]
  • 白岩孝行, 山口悟, MURAVYEV Y D 日本雪氷学会全国大会講演予稿集 1997 29 1997年09月 [査読無し][通常論文]
  • 山口悟, 白岩孝行, 成瀬廉二 日本雪氷学会全国大会講演予稿集 1997 176 1997年09月 [査読無し][通常論文]
  • 白岩孝行, 山口悟, 児玉裕二, 松元高峰, MURAVYEV Y D, GLAZIRIN G E 日本雪氷学会全国大会講演予稿集 1997 185 1997年09月 [査読無し][通常論文]
  • 山口悟, 白岩孝行, 成瀬廉二, MURAVYEV V D, GLAZIRIN G E 日本雪氷学会全国大会講演予稿集 1997 184 1997年09月 [査読無し][通常論文]
  • YAMAGUCHI Satoru, SHIRAIWA Takayuki, MURAVYEV Yaroslav D., GLAZIRIN Gleb E., NARUSE Renji Bulletin of glacier research 15 47 -52 1997年07月01日
  • KODAMA Yuji, MATSUMOT Takane, GLAZIRIN Gleb E., MURAVYEV Yaroslav D., SHIRAIWA Takayuki, YAMAGUCHI Satoru Bulletin of glacier research 15 37 -45 1997年07月01日
  • 児玉 裕二, 白岩 孝行, Muravyev Yaroslav D., Matsumoto Takane, Yamaguchi Satoru, Muravyev Yaroslav D., Glazirin Gleb E. 低温科学. 物理篇. 資料集 55 107 -136 1997年03月 
    カムチャッカにおける氷河が如何に気候変化に応答しているかを調べる端緒として、クロノツキー半島のカレイタ氷河で気象、水文、氷河の観測を1996年7月に実施した。また、この地域の過去の気候変化を復元するための予察調査として、ウシュコフスキー火山山頂の氷冠で雪氷コア堀削を1996年7月から8月にかけて実施した。これらの調査で得られたデータを報告する。
  • 白岩 孝行, 山口 悟, MURAVYEV Yaroslav 日本地理学会発表要旨集 = Proceedings of the General Meeting of the Association of Japanese Geographers 51 (51) 150 -151 1997年03月 [査読無し][通常論文]
  • 松岡健一, 白岩孝行, 浦塚清峰, 大井正行, 前野英生, 山口悟, MURAVYEV Y D, 成瀬廉二, 前晋爾 雪氷 59 (4) 257 -262 1997年 [査読無し][通常論文]
  • Glaciological features of Koryto Glacier in the kronotsky Peninsula, Kamchatka, Russia
    Bulletin of Glacier Research 15 27 -36 1997年 [査読無し][通常論文]
  • SHOJI Hitoshi, SAITO Takashi, SAITO Takeshi, SHIRAIWA Takayuki, TAGUCHI Yuji, YOKOYAMA Kotaro, HONDOH Takeo, WATANABE Okitsugu, MOTOYAMA Hideaki, FURUKAWA Teruo, TAKEKAWA Motoaki, AGETA Yutaka Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 10 149 -149 1996年09月 
    Information on paleoenvironmental changes on the earth is preserved in the form of physical and chemical stratigraphic features in large polar ice sheets. Extraction of ice core signals makes it possible to evaluate and reconstruct past global variations of climate and stmospheric circulation. A deep ice coring and analysis effort was started at Dome Fuji Station (77°19′01″S, 39°42′12″E). Antarctica by the 32nd Japanese Antarctic Research Expedition (JARE-32) in 1991 and will be completed with continuous deep core retrieval in 1997. JARE-32,-33 and -34 parties set up a traverse route from Syowa Station to Dome Fuji Station, selected the coring site considering the results from radar soundings and GPS positions, and conducted shallow ice coring to a depth of 112.6m at the site. JARE-35 party completed construction of a camping/drilling facility for JARE-36 and -37 wintering parties to perform deep ice coring through the ice sheet with a thickness of approximately 3km. JARE-36 parties also conducted glaciological, meteorological and medical observations during the periods of cargo transportation and camp-construction activities both along the traverse route and at the Dome Fuji Station drilling site.
  • ENOMOTO Hiroyuki, MOTOYAMA Hideaki, SHIRAIWA Takayuki, SAITO Takashi, KAMEDA Takao, FURUKAWA Teruo, TAKAHASHI Shuhei, WATANABE Okitsugu Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 10 155 -155 1996年09月 
    Automatic weather stations (AWS) using data loggers were distributed along the traverse route from Syowa Station to Dome Fuji Station (3810m a. s. l.). A data logger was set at Dome Fuji Station in January, 1994 and the first year-round observations were performed at Dome Fuji Station. The temperature data shows recurring abrupt increases in winter. The minimum temperature in 1994 was -78.1℃ and the mean temperature was -52℃. Wind direction was highly variable. Katabatic wind with constant wind direction is not observed but wind direction rotated counter-clockwise throughout the year. There were some interruptions in the wind speed data, thus a complete wind speed data set could not be obtained at Dome Fuji Station. However, the data show a wind of 12.7m/s in winter. The wind direction in that case was between north and east. This could be a case of a storm at Dome Fuji Station.
  • SHIRAIWA Takayuki, TAGUCHI Yuji, SAITO Takashi, SHOJI Hitoshi, YOKOYAMA Kotaro, WATANABE Okitsugu, ENOMOTO Hiroyuki, KODAMA Yuji, TAKEUCHI Yukari Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 10 150 -150 1996年09月 
    Observations on the evaporation-condensation process and heat-balance were conducted at Dome Fuji Station, the highest point of Queen Maud Land, East Antarctica, during the austral summer of 1994/1995. Evaporation and condensation at the snow surface were measured by weighing evaporation-pans filled with undisturbed snow twice a day; 0600 a. m. and 1800 p. m. Heat fluxes of net radiation (〓_n) and in the snow (〓_c) were measured by a net radiometer and a series of thermistor sensors installed in the snow, respectively. The evaporation amounted, at its maximum, to approximately (10)^<-1>kg m^<-2> from 0600 a. m. to 1800 p. m., while the condensation was 2×(10)^<-2>kg m^<-2> during the night from 1800 p. m. to 0600 a. m. As a result, evaporation dominated condensation during the two summer months of 1994/1995 at Dome Fuji Station. If we calculate the latent heat flux (〓_l) on the basis of observations of the evaporation and condensation, and the residue of heat flux components is assigned to the sensible heat flux (〓_s), the average amounts of each component during the two summer months were calculated to be 12 W m^<-2>(〓_n), -4 W m^<-2>(〓_c), -1 W m^<-2>(〓_l), -7 W m^<-2>(〓_s).
  • 山口悟, 白岩孝行, 成瀬廉二 日本雪氷学会全国大会講演予稿集 1996 59 1996年09月 [査読無し][通常論文]
  • Shiraiwa Takayuki, Saito Takashi, Saito Takeshi, Shoji Hitoshi, Taguchi Yuji, Abo Toshihiro, Yamamoto Yuji, Inagawa Yuzuru, Yokoyama Kotaro, Watanabe Okitsugu JARE data reports 211 1 -69 1996年03月
  • Takayuki SHIRAIWA, Takashi SAITO, Takeshi SAITO, Hitoshi SHOJI, Yuji TAGUCHI, Toshihiro ABO, Yoshikatsu YAMAMOTO, Yuzuru INAGAWA, Kotaro YOKOYAMA, Okitsugu WATANABE JARE data reports. Glaciology = JARE data reports. Glaciology 25 31 -69 1996年03月
  • Takayuki SHIRAIWA, Takashi SAITO, Takeshi SAITO, Hitoshi SHOJI, Yuji TAGUCHI, Toshihiro ABO, Yoshikatsu YAMAMOTO, Yuzuru INAGAWA, Kotaro YOKOYAMA, Okitsugu WATANABE JARE data reports. Glaciology = JARE data reports. Glaciology 25 2 -4 1996年03月
  • Takayuki SHIRAIWA, Takashi SAITO, Takeshi SAITO, Hitoshi SHOJI, Yuji TAGUCHI, Toshihiro ABO, Yoshikatsu YAMAMOTO, Yuzuru INAGAWA, Kotaro YOKOYAMA, Okitsugu WATANABE JARE data reports. Glaciology = JARE data reports. Glaciology 25 5 -30 1996年03月
  • ENOMOTO Hiroyuki, WARASHINA Hideo, SAITO Takashi, SHIRAIWA Takayuki Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 10 119 -126 1996年 [査読無し][通常論文]
     
    This paper focuses on the interannual variability of sea-ice conditions in spring and summer in the vicinity of Syowa Station. Sea ice extent and concentration are discussed using DMSP SSM/I satellite passive microwave data. Persistent high ice concentration was observed in December in 1989 and 1993. In those years, sea ice was formed earlier in the autumn (April-May) and expanded rapidly in this initial stage. The sea ice concentrations were higher throughout the winter season in these years. Cold and calm weather conditions in autumn seem to be important in determining the following winter ice condition.
  • SHIRAIWA Takayuki, SHOJI Hitoshi, SAITO Takashi, YOKOYAMA Kotaro, WATANABE Okitsugu Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 10 1 -12 1996年 [査読無し][通常論文]
     
    Stratigraphical observations were carried out on the surface snow from the coast to the ice divide, Dome Fuji Station, in the summer of 1994/1995,to provide microwave remote sensing with ground truth data. Stratification, grain size and dielectric properties were measured in 1m-deep snow pits excavated every 30-40km of the 1000km-long Dome Fuji Station traverse route. There exist three regional characteristics in the altitudinal distribution of the averaged real part of the dielectric constant ε′ : a constant value in the coastal region, a higher value in the intermediate region, and a gradual decrease in the higher region. According to the measured snow properties indispensable to the utilization of microwave remote sensing, the dry snow zone of the studied area is divided into three parts : a region of compacted snow and solid-type depth hoar (1000 to 2000/2300m a.s.l.), where spatial and vertical distribution of various snow properties are uniform; a region of wind-packed snow and skeleton-type depth hoar (2000/2300 to 3500m), which is characterized by spatial alteration of the glazed surface and the stratified depth hoar layer; a region of interbedded skeleton-and solid-types depth hoar (higher than 3500m) where the seasonal stratification of snow is characterized by thin-hard summer and thick-soft winter layers.
  • 成瀬廉二, 秋田谷英次, 西村浩一, 白岩孝行, 山口悟, 須沢啓一, 天見正和, 伊藤陽一, 根本征樹 低温科学 資料編 55 (55) 13 -26 1996年 [査読無し][通常論文]
     
    1996年2月下旬に,北海道内広域の58地点にて積雪調査を行った。測定項目は,積雪深,積雪水量,層位・雪質・粒径,ラム硬度,雪温である。同年冬期は,札幌を中心とした日本海側では記録的な大雪であり,一方北海道東部は平年より少雪であった。全層平均密度と全層平均ラム硬度は,積雪量が多い北海道西部で高い値を,積雪量が少なく「しもざらめ雪」が顕著な東部で低い値を示した。
  • 秋田谷英次, 西村浩一, 白岩孝行, 尾関俊浩, 伊藤陽一, 山口悟, 須沢啓一 低温科学 資料編 55 (55) 1 -11 1996年 [査読無し][通常論文]
     
    1995-96年冬期の北海道大学低温科学研究所の裏庭でなされた積雪断面観測の結果を示した。毎月 5,15,25日に積雪断面を用いた観測で, 1963-64年冬期以来続けられてる。観測項目は成層構造・雪質・密度・硬度・雪温・含水率・全水量・ラム硬度である。さらに過去14冬期の積雪の特徴の一覧表と積雪深の推移も示した。今冬の積雪の特徴は,積雪堆積の初期である12月と1月に過去に例を見ないほどの多量の降雪があったことである。最大積雪深は2月11日に記録された144cmであり, 過去14冬期中で最大であった。消雪も最も遅く,4月21日であった。
  • 榎本 浩之, 本山 秀明, 白岩 孝行, 斉藤 隆志, 亀田 貴雄, 古川 晶雄, 高橋 修平, 渡辺 興亜 大会講演予講集 68 1995年10月16日 [査読無し][通常論文]
  • 山田 知充, 白岩 孝行 雪氷 57 (3) 257 -267 1995年 [査読無し][通常論文]
     
    ヒマラヤ・カラコルム地域の近年の氷河変動を,前世紀~1970年代までの観察・観測記録および最近20年間の観測結果の2つの観点からまとめた.ヒマラヤ・カラコルム地域とも,前世紀以降,大局的には後退傾向が顕著であるが,カラコルム地球では20世紀初頭に氷河の前進が認められた.また,カラコルム地域ではサージによる氷河の突発前進が頻繁に生じていることがわかった.最近の20年間に関しては後退傾向が著しく,特に後半になって後退傾向はより顕著になっている.ネパール・ヒマラヤの観測からは,ここ数年の氷河の著しい後退の原因は気温上昇にあると推定される.前世紀以降の氷河変動の原因に関しては,気温や降水量の変動,あるいは氷河の力学的な応答の遅れなどが指摘されているが,まだ明らかなことはわかっていない.
  • 本山 秀明, 榎本 浩之, 古川 晶雄, 神山 孝吉, 庄子 仁, 白岩 孝行, 渡辺 和夫, 生巣 国久, 池田 尚應, Hideaki Motoyama, Hiroyuki Enomoto, Teruo Furukawa, Kokichi Kamiyama, Hitoshi Shoji, Takayuki Shiraiwa, Kazuo Watanabe, Kunihisa Namasu, Hisataka Ikeda 南極資料 = Antarctic Record 39 (2) 94 -98 1995年 [査読無し][通常論文]
     
    GPS相対測位による東南極のS16からドームふじに至るトラバースルートに沿っての氷河流動観測が1992年から行われている。このGPS衛星を利用しての相対測位法は, 従来の衛星を用いたJMR法や三角鎖法より野外では簡便な観測法である。観測誤差は, 2地点間の距離の100万分の1以内に収まる。同一地点の1年平均の氷河の流動速度と方向は安定していた。Ice flow has been observed along traverse routes from S16 to Dome Fuji, East Antarctica using the differential GPS (Global Positioning System) method since 1992. This positioning method is easier to use in the field than the satellite doppler positioning system (JMR) or triangle chain method. The vertical and horizontal error of positioning was within 1ppm of base line. The horizontal speed and direction of ice flow were almost the same both years at each site.
  • 山田 知充, 白岩 孝行 雪氷 57 (3) 257 -267 1995年 [査読無し][通常論文]
     
    ヒマラヤ・カラコルム地域の近年の氷河変動を,前世紀~1970年代までの観察・観測記録および最近20年間の観測結果の2つの観点からまとめた.ヒマラヤ・カラコルム地域とも,前世紀以降,大局的には後退傾向が顕著であるが,カラコルム地球では20世紀初頭に氷河の前進が認められた.また,カラコルム地域ではサージによる氷河の突発前進が頻繁に生じていることがわかった.最近の20年間に関しては後退傾向が著しく,特に後半になって後退傾向はより顕著になっている.ネパール・ヒマラヤの観測からは,ここ数年の氷河の著しい後退の原因は気温上昇にあると推定される.前世紀以降の氷河変動の原因に関しては,気温や降水量の変動,あるいは氷河の力学的な応答の遅れなどが指摘されているが,まだ明らかなことはわかっていない.
  • 秋田谷 英次, 白岩 孝行 低温科学. 物理篇. 資料集 51 1 -8 1993年03月 
    1991-92年冬期の北海道大学低温科学研究所の裏庭でなされた積雪断面観測の結果を示した。この観測は毎月 5,15,25日に積雪断面を用いて行い, 1963-64年冬期以来続けられてる。観測項目は成層構造・雪質・密度・硬度・雪温・含水率・全水量・ラム硬度である。さらに過去10冬期の積雪の特徴の一覧表と積雪深の推移を図で示した。
  • 白岩 孝行 低温科学. 物理篇. 資料集 51 59 -86 1993年03月 
    ネパール・ヒマラヤの中央部に位置するランタン谷の3地点において,2年間にわたる岩盤表面温度の測定を行なった。グレーシャー・キャンプ観測点(標高5110m)とキャンチェン観測点(4110m)は谷の南向き斜面を,ガンジャ・ラ観測点(5090m)は北向き斜面を代表する観測点である。観測の結果,これらの3地点では,岩石の凍結破砕作用に影響する,岩盤表面温度が0℃をはさんで上下する凍結融解サイクルが頻繁に起こっていることが確認された。その発生する季節は,グレーシャー・キャンプでは夏を除くすべての期間,ガンジャ・ラ観測点では春と秋,キャンチェン観測観測点では冬であることが判明した。
  • 氷河地形に基づくヒマラヤ・チベットの古環境復元
    地形 14 195 -220 1993年 [査読無し][通常論文]
  • 白岩 孝行 地形 = Transactions, Japanese Geomorphological Union 14 (3) 195 -220 1993年 [査読無し][通常論文]
  • Glacial fluctuations and Cryogenic environments in the Langtang Valley, Nepal Himalaya.
    Contributions from Institute of Low Temperature Science 38 1 -98 1993年 [査読無し][通常論文]
  • 秋田谷 英次, 白岩 孝行, 尾関 俊浩 低温科学. 物理篇 50 15 -21 1992年03月
  • 秋田谷 英次, 白岩 孝行, 尾関 俊浩 低温科学. 物理篇. 資料集 50 1 -8 1992年03月
  • Fluctuation of the glaciers from the 1970s to 1989 in the Khumbu, Shorong and Langtang regions, Nepal himalayas.
    Bulletin of Glacier Research 10 1992年 [査読無し][通常論文]
  • Timing of the Little Ice Age glaciation in Reindalen, West Spitsbergen, reconstructed by Lichenometry.
    Proceedings of the International Symposium on the Little Ice Age Clima. 1992年 [査読無し][通常論文]
  • A preliminary report on the air temperature in Reindalen, west Spitsbergen.
    Bulletin of Glacier Research 10 1992年 [査読無し][通常論文]
  • Distribution of mass input on glaciers in the Langtang Valley, Nepal Himalayas.
    Bulletin of Glacier Research 10 1992年 [査読無し][通常論文]
  • T SHIRAIWA, T WATANABE ARCTIC AND ALPINE RESEARCH 23 (4) 404 -416 1991年11月 [査読無し][通常論文]
     
    Glacial fluctuations in the Langtang Himal are discussed on the basis of multiple relative dating (RD) methods in addition to the C-14 method. The RD methods used for the classification of the moraine deposits include the Schmidt hammer rebound values, weathering rind thickness, percentage of clasts with oxidation stain, height of mineral projection, pit depth, percentage of weathered clasts, soil development, and soil color index. By using the RD data, we were able to divide the moraines into five stages (Gora Tabela, Langtang, Lirung, and Yala I and II); an older stage (Lama) is recognized only by the glacial-trough configuration extending down to an altitude of approximately 2600 m. The Gora Tabela Stage is defined by the deeply weathered Lower Till extending down to 3200 m a.s.l. The Langtang Stage (3650-3000 C-14 yr BP) probably corresponds to the greatest advance in the Holocene, followed by a series of smaller advances in the Lirung Stage (2800-550 C-14 yr BP), and the two smaller Little Ice Age advances (Yala I and II Stages).
  • Glacier Inventory of the Langtang Valley, Nepal Himalayas.
    50 1991年 [査読無し][通常論文]
  • WATANABE T. Bulletin of Glacier Research 7 209 -220 1989年 [査読無し][通常論文]

共同研究・競争的資金等の研究課題

  • カムチャッカ半島の氷河変動に関する研究
    科学研究費補助金
    研究期間 : 1995年 -2010年
  • Glacier fluctuations in Kamchatka Peninsula
    Grant-in-Aid for Scientific Research
    研究期間 : 1995年 -2010年
  • ヒマラヤ山脈の氷河変動に関する研究
    研究期間 : 1987年 -2010年
  • Glacier fluctuations in Himalaya
    研究期間 : 1987年 -2010年
  • 南極氷床の質量収支に関する研究
    研究期間 : 1993年 -2008年
  • Glacier mass balance of the Antarctic Ice Sheet
    研究期間 : 1993年 -2008年

教育活動情報

主要な担当授業

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    開講年度 : 2021年
    課程区分 : 修士課程
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    キーワード : 熱収支,融雪流出,水循環,積雪分布,土壌凍結,吹雪,雪崩 Heat balance, Snowmelt runoff, Water cycle, Snow distribution, Ground freezing, Blowing snow, Avalanche
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    キーワード : 野外調査、氷、雪、気象、山岳、ロープ、高山病、低体温症、救命法
  • 大学院共通授業科目(教育プログラム):南極学
    開講年度 : 2021年
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    キーワード : 氷河、雪、氷、凍土、気象、アルプス、山岳、環境科学
  • 大学院共通授業科目(教育プログラム):南極学
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 野外観測、降雪、積雪、気象、水文
  • 地球雪氷学基礎論
    開講年度 : 2021年
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    開講学部 : 環境科学院
    キーワード : 雪氷・寒冷圏、雪、氷、極地 cryosphere, snow, ice, polar regions
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