Researcher Profile and Settings

Master

Affiliation (Master)

• Institute of Low Temperature Science　Pan-Okhotsk Research Center

Affiliation (Master)

• Institute of Low Temperature Science　Pan-Okhotsk Research Center

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Profile and Settings

Degree

• Ph. D (Science)（Graduate University for Advanced Studies）

Profile and Settings

• Name (Japanese)

  Matoba

• Name (Kana)

  Sumito

• Name

  200901098748182924

Alternate Names

http://wwwoc.lowtem.hokudai.ac.jp/~matoba/index.html

Achievement

Research Interests

• Kamchatka   Alaska   Greenland   古気候   氷河   アイスコア   

Research Areas

• Natural sciences / Atmospheric and hydrospheric science

Research Experience

• 2007/04 - Today Hokkaido University Institute of Low Temperature Science
• 2005/03 - 2007/03 Hokkaido University Institute of Low Temperature Science
• 2003/01 - 2005/02 国立環境研究所 基盤研究ラボ 重点研究支援協力員
• 2001/04 - 2002/12 National Institute of Polar Research
• 1998/10 - 2001/03 Hokkaido University Institute of Low Temperature Science

Education

• 1995/04 - 1998/03  The Graduate University for Advanced Studies
• 1993/04 - 1995/03  京都大学大学院
• 1989/04 - 1993/03  Kyoto University  Faculty of Science

Awards

• 2019/09 （公社）日本雪氷学会 論文賞
   バフィン湾周辺の環境がグリーンランド北西部の 降雪中の d-excess と化学成分に与える影響 

  受賞者: 黒﨑 豊・的場 澄人・飯塚 芳徳・庭野 匡思・谷川 朋範・青木 輝夫
• 2008 寒地技術賞（地域振興部門）
  

Published Papers

• High-resolution analyses of concentrations and sizes of black carbon particles deposited on northwest Greenland over the past 350 years – Part 2: Seasonal and temporal trends in black carbon originated from fossil fuel combustion and biomass burning

  Kumiko Goto-Azuma, Yoshimi Ogawa-Tsukagawa, Kaori Fukuda, Koji Fujita, Motohiro Hirabayashi, Remi Dallmayr, Jun Ogata, Nobuhiro Moteki, Tatsuhiro Mori, Sho Ohata, Yutaka Kondo, Makoto Koike, Sumito Matoba, Teruo Aoki

  2024/05/23 

  Abstract. The roles and impacts of black carbon (BC), an important aerosol species affecting Earth’s radiation budget, are not well understood owing to lack of accurate long-term observations. To study the temporal changes in BC since the pre-industrial period, we analysed BC in an ice core drilled in northwest Greenland. Using an improved technique for BC measurement and a continuous flow analysis system, we obtained accurate and high temporal resolution records of BC particle size and mass/number concentrations for the past 350 years. Number and mass concentrations, which both started to increase in the 1870s associated with inflow of anthropogenically derived BC, reached their maxima in the 1910s–1920s and then subsequently decreased. On the basis of backward trajectory analyses, we found that North America was the dominant source region of the anthropogenic BC in the ice core. The increase in anthropogenic BC shifted the annual concentration peaks of BC from summer to winter–early spring. After BC concentrations diminished to pre-industrial levels, the annual peak concentration of BC returned to the summer. We found that anthropogenic BC particles were larger than biomass burning BC particles. By separating the BC in winter and summer, we reconstructed the temporal variations in BC that originated from biomass burning, including the period with large anthropogenic input. The BC that originated from biomass burning showed no trend of increase until the early 2000s. Finally, possible albedo reductions due to BC are discussed. Our new data provide key information for validating aerosol and climate models, thereby supporting improved projections of future climate and environment.
• Technical note: High-resolution analyses of concentrations and sizes of black carbon particles deposited on northwest Greenland over the past 350 years – Part 1. Continuous flow analysis of the SIGMA-D ice core using a Wide-Range Single-Particle Soot Photometer and a high-efficiency nebulizer

  Kumiko Goto-Azuma, Remi Dallmayr, Yoshimi Ogawa-Tsukagawa, Nobuhiro Moteki, Tatsuhiro Mori, Sho Ohata, Yutaka Kondo, Makoto Koike, Motohiro Hirabayashi, Jun Ogata, Kyotaro Kitamura, Kenji Kawamura, Koji Fujita, Sumito Matoba, Naoko Nagatsuka, Akane Tsushima, Kaori Fukuda, Teruo Aoki

  2024/05/23 

  Abstract. Ice cores can provide long-term records of black carbon (BC), an important aerosol species closely linked to the climate and environment. However, previous studies of ice cores only analysed BC particles with diameter of <600–850 nm, which could have led to underestimation of BC mass concentrations. Information on the size distribution of BC particles is very limited, and there are no Arctic ice core records of the temporal variation in BC size distribution. In this study, we applied a recently developed improved technique to analyse the BC concentration in an ice core drilled at the SIGMA-D site in northwest Greenland. The improved technique, which uses a modified Single-Particle Soot Photometer and a high-efficiency nebulizer, widens the measurable range of BC particle size. For high-resolution continuous analyses of ice cores, we developed a continuous flow analysis (CFA) system (resolution: 10–40 mm). Coupling of the improved BC measurement technique with the CFA system allows accurate high-resolution measurements of the size distribution and concentration of BC particles with diameter between 70 nm and 4 μm, with minimal particle losses. Using this technique, we reconstructed the size distributions and the number and mass concentrations of BC particles during the past 350 years. On the basis of the size distributions, we assessed the underestimation of BC mass concentrations measured using the conventional method. For the period 2003–2013, the underestimation of the average mass concentration would have been 12 %–17 % for the SIGMA-D core.
• Development of a handheld integrating sphere snow grain sizer (HISSGraS)

  Teruo Aoki, Akihiro Hachikubo, Motoshi Nishimura, Masahiro Hori, Masashi Niwano, Tomonori Tanikawa, Konosuke Sugiura, Ryo Inoue, Satoru Yamaguchi, Sumito Matoba, Rigen Shimada, Hiroshi Ishimoto, Jean-Charles Gallet

  Annals of Glaciology 1 - 12 0260-3055 2023/11/29 

  Abstract We developed a Handheld Integrating Sphere Snow Grain Sizer (HISSGraS) for field use to measure the specific surface area (SSA) of snow. In addition to snow samples, HISSGraS can directly measure snow surfaces and snow pit walls. The basic measurement principle is the same as that of the IceCube SSA instrument. The retrieval algorithm for SSA from reflectance employs two conversion equations formulated using spherical and nonspherical grain shape models. We observed SSAs using HISSGraS, IceCube and the gas adsorption method in a snowfield in Hokkaido, Japan. Intercomparison of the results confirmed that with HISSGraS direct measurement, SSA profile observations can be completed in just ~1/10 the time required for measurement of snow samples. Our results also suggest that HISSGraS and IceCube have similar accuracy when the same snow samples are measured using the same grain shape model. However, SSAs of near-surface snow layers measured using the three techniques exhibited some biases, possibly due to rapid snow metamorphism or melting during measurement and some technical issues with optical techniques. When excluding SSA data for the surface layer, which metamorphosed remarkably during measurement, IceCube- and HISSGraS-derived SSAs correlated strongly with those obtained by gas adsorption and HISSGraS accuracy is 21–34%.
• SE‐Dome II Ice Core Dating With Half‐Year Precision: Increasing Melting Events From 1799 to 2020 in Southeastern Greenland

  Kaoru Kawakami, Yoshinori Iizuka, Mahiro Sasage, Mai Matsumoto, Takeshi Saito, Akira Hori, Sakiko Ishino, Shuji Fujita, Koji Fujita, Keita Takasugi, Takumi Hatakeyama, Saaya Hamamoto, Akihisa Watari, Nao Esashi, Miu Otsuka, Ryu Uemura, Kazuho Horiuchi, Masahiro Minowa, Shohei Hattori, Teruo Aoki, Motohiro Hirabayashi, Kenji Kawamura, Sumito Matoba

  Journal of Geophysical Research: Atmospheres 128 (20) 2169-897X 2023/10/13 

  Abstract Arctic warming has accelerated surface melting even in the highland areas of the Greenland ice sheet (GrIS). Understanding the relationship between climate and surface melting is essential for improving the estimates of ice‐sheet mass loss due to warming. Here we analyze a 250 m‐long ice core from the southeastern dome of GrIS (SE‐Dome site; 67°19′17″ N, 36°47′03″ W, 3,161 m a.s.l.), where the annual mean temperature is −20.9°C and the accumulation rate is high and there is a large discrepancy among climate models regarding snow accumulation estimates. A time scale was established for 1799–2020 with a half‐year uncertainty using annual counting of H₂O₂ concentration and five time horizons determined by electrical conductivity, melt events, and tritium concentration. The annual accumulation rate from the ice core shows no significant trend over 221 years and has an average of 1.04 ± 0.20 m w.e. year⁻¹. In contrast, the frequency and thickness of refrozen melt layer (ML) have increased over 221 years, and are synchronized with temperature changes in the Arctic. The thickness of MLs correlates positively with the time‐integrated summer temperature anomaly using a reanalysis of air temperature. The in‐situ accumulation records in the southeastern GrIS provide an important basis for correcting reanalysis data such as ERA5, which in turn are valuable for improving regional climate models.
• Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland, 2012–2020

  Motoshi Nishimura, Teruo Aoki, Masashi Niwano, Sumito Matoba, Tomonori Tanikawa, Tetsuhide Yamasaki, Satoru Yamaguchi, Koji Fujita

  Earth Science System Data 2023/04/28 [Refereed][Not invited]
  
• Increased oceanic dimethyl sulfide emissions in areas of sea ice retreat inferred from a Greenland ice core

  Yutaka Kurosaki, Sumito Matoba, Yoshinori Iizuka, Koji Fujita, Rigen Shimada

  Communications Earth & Environment 3 (1) 2022/12/26 

  Abstract Ocean phytoplankton are an important source of dimethyl sulfide, which influences marine cloud formation. Model studies suggest that declines in Arctic sea ice may lead to increased dimethyl sulfide emissions, however observational support is lacking. Here, we present a 55-year high-resolution ice core record of methane sulfonic acid flux, an oxidation product of dimethyl sulfide, from the southeast Greenland Ice Sheet. We infer temporal variations in ocean dimethyl sulfide emissions and find that springtime (April–June) fluxes of methane sulfonic acid correlate well with satellite-derived chlorophyll-a concentration in the Irminger Sea. Summertime (July–September) methane sulfonic acid fluxes were 3 to 6 times higher between 2002–2014 than 1972–2001. We attribute this to sea ice retreat day becoming earlier and a coincident increase in chlorophyll-a concentration in the adjacent open coastal waters.
• Inclusions in ice layers formed by melting and refreezing processes in a Greenland ice core

  Kaoru Kawakami, Yoshinori Iizuka, Sumito Matoba, Teruo Aoki, Takuto Ando

  Journal of Glaciology 1 - 13 0022-1430 2022/11/21 

  Abstract In recent decades, surface melting on the inland Greenland ice sheet has increased, leading to significant meltwater-refreezing in the snow and firn. Increased knowledge of the physical and chemical characteristics of these melt features (i.e., ice layers) is needed to help estimate future global sea-level rise. Here, using a combination of microscopy and spectroscopy, we investigate the size, shape, location, and chemical compositions of inclusions in 12 ice layers of the SIGMA-A ice core in the northwestern Greenland ice sheet (78°03′06″N, 67°37′42″W, 1490 m a.s.l.). In the ice layers, we found inclusions exceeding 30 μm diameter that could only be formed by melting–refreezing, which we classify into columnar-, particle-, and rod-like inclusions. We propose that the smaller columnar- and particle-like inclusions of solid Na₂SO₄⋅10H₂O and CaSO₄⋅2H₂O form first, within the ice grains, followed by the larger rod-like inclusions of brines with mainly Na⁺ and Cl⁻ in grain boundaries. Our results suggest a new proxy that may help identify past warm climates in deeper ice cores in Greenland and for studying future ice sheet melting behavior.
• High Flux of Small Sulfate Aerosols During the 1970s Reconstructed From the SE‐Dome Ice Core in Greenland

  Y. Iizuka, R. Uemura, H. Matsui, N. Oshima, K. Kawakami, S. Hattori, H. Ohno, S. Matoba

  Journal of Geophysical Research: Atmospheres 2022/09/16 [Refereed][Not invited]
  
• Gypsum formation from calcite in the atmosphere recorded in aerosol particles transported and trapped in Greenland ice core sample is a signature of secular change of SO2 emission in East Asia

  Chihiro Miyamoto, Yoshinori Iizuka, Sumito Matoba, Shohei Hattori, Yoshio Takahashi

  Atmospheric Environment 278 119061 - 119061 1352-2310 2022/06 [Refereed]
  
• Developing an insulation box with automatic temperature control for PM2.5 measurements in cold regions

  Teppei J. Yasunari, Shigeto Wakabayashi, Yutaka Matsumi, Sumito Matoba

  Journal of Environmental Management 311 114784 - 114784 0301-4797 2022/06
• Estimation of Seasonal Snow Mass Balance all over Japan Using a High-Resolution Atmosphere-Snow Model Chain

  Masashi Niwano, Masami Suya, Koichi Nagaya, Satoru Yamaguchi, Sumito Matoba, Ikuo Harada, Nozomu Ohkawara

  SOLA 18 193 - 198 2022
• Ground-based measurements for the validation of snow/ice products in optical remote sensing

  Tomonori Tanikawa, Teruo Aoki, Masahiro Hori, Akihiro Hachikubo, Masashi Niwano, Konosuke Sugiura, Sumito Matoba, Rigen Shimada

  Journal of the Remote Sensing Society of Japan 41 (5) 582 - 594 2021/12 [Not refereed]
  
• Spectral degree of linear polarization and neutral points of polarization in snow and ice surfaces

  Tomonori Tanikawa, Kazuhiko Masuda, Hiroshi Ishimoto, Teruo Aoki, Masahiro Hori, Masashi Niwano, Akihiro Hachikubo, Sumito Matoba, Konosuke Sugiura, Takenobu Toyota, Nozomu Ohkawara, Knut Stamnes

  Journal of Quantitative Spectroscopy and Radiative Transfer 273 107845 - 107845 0022-4073 2021/10 [Refereed]
  
• Quantifying Relative Contributions of Light‐Absorbing Particles from Domestic and Foreign Sources on Snow Melt at Sapporo, Japan during the 2011–2012 Winter

  M. Niwano, M. Kajino, T. Kajikawa, T. Aoki, Y. Kodama, T. Tanikawa, S. Matoba

  Geophysical Research Letters 0094-8276 2021/08/09
• Ice Core Drilling and the Related Observations at SE-Dome site, southeastern Greenland Ice Sheet

  Yoshinori IIZUKA, Sumito MATOBA, Masahiro MINOWA, Tetsuhide YAMASAKI, Kaoru KAWAKAMI, Ayako KAKUGO, Morihiro MIYAHARA, Akihiro HASHIMOTO, Masashi NIWANO, Tomonori TANIKAWA, Koji FUJITA, Teruo AOKI

  Bulletin of Glaciological Research 39 1 - 12 1345-3807 2021/08 [Refereed]
  
• Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores

  Koji Fujita, Sumito Matoba, Yoshinori Iizuka, Nozomu Takeuchi, Akane Tsushima, Yutaka Kurosaki, Teruo Aoki

  Earth and Space Science 8 (7) 2333-5084 2021/07 [Refereed]
   

  Previous reconstructions of summer temperatures from ice cores have relied on a statistical relationship between a melt layer and temperature observed at nearby stations. This study presents a novel method for reconstructing summer temperatures from melt layers in ice cores using an energy balance model that incorporates heat conduction and meltwater refreezing in the firn. We use the seasonal patterns in the ERA-Interim reanalysis data set for an ice core site to calculate the amounts of refreezing water within the firn under various summer mean temperature (SMT) and annual precipitation conditions, and prepared calibration tables containing these three variables. We then estimate the SMTs from the refreezing amount and annual accumulation, both of which can be obtained from an ice core. We apply this method to four ice cores that were recovered from sites with different climates: two sites on the Greenland Ice Sheet, one in Alaska, and one in Russian Altai. The reconstructed SMTs show comparable variations with those of observed temperatures at nearby stations. The nonlinear relationship between SMT and melt layer thickness differs between sites, indicating that a single linear approximation cannot be employed to estimate SMT. Sensitivity analyses suggest that the annual temperature range, amount of annual precipitation, and firn albedo (which is a time-invariant value in the model) significantly affect the relationship between SMT and melt layer thickness. This new method provides an alternative to existing approaches and yields an independent estimate of SMT from ice cores that have been affected by melting.
• Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years

  Naoko Nagatsuka, Kumiko Goto-Azuma, Akane Tsushima, Koji Fujita, Sumito Matoba, Yukihiko Onuma, Remi Dallmayr, Moe Kadota, Motohiro Hirabayashi, Jun Ogata, Yoshimi Ogawa-Tsukagawa, Kyotaro Kitamura, Masahiro Minowa, Yuki Komuro, Hideaki Motoyama, Teruo Aoki

  Climate of the Past 17 (3) 1341 - 1362 1814-9324 2021/06/21 [Refereed]
   

  Abstract. Our study is the first to demonstrate a high-temporal-resolution record of mineral composition in a Greenland ice core over the past 100 years. To reconstruct past variations in the sources and transportation processes of mineral dust in northwestern Greenland, we analysed the morphology and mineralogical composition of dust in the SIGMA-D ice core from 1915 to 2013 using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results revealed that the ice core dust consisted mainly of silicate minerals and that the composition varied substantially on multi-decadal and inter-decadal scales, suggesting that the ice core minerals originated from different geological sources in different periods during the past 100 years. The multi-decadal variation trend differed among mineral types. Kaolinite, which generally formed in warm and humid climatic zones, was abundant in colder periods (1950–2004), whereas mica, chlorite, feldspars, mafic minerals, and quartz, which formed in arid, high-latitude, and local areas, were abundant in warmer periods (1915–1949 and 2005–2013). Comparison to Greenland surface temperature records indicates that multi-decadal variation in the relative abundance of these minerals was likely affected by local temperature changes in Greenland. Trajectory analysis shows that the minerals were transported mainly from the western coast of Greenland in the two warming periods, which was likely due to an increase in dust sourced from local ice-free areas as a result of shorter snow/ice cover duration in the Greenland coastal region during the melt season caused by recent warming. Meanwhile, ancient deposits in northern Canada, which were formed in past warmer climates, seem to be the best candidate during the colder period (1950–2004). Our results suggest that SEM–EDS analysis can detect variations in ice core dust sources during recent periods of low dust concentration.
• Isotopic evidence for acidity-driven enhancement of sulfate formation after SO2 emission control

  Shohei Hattori, Yoshinori Iizuka, Becky Alexander, Sakiko Ishino, Koji Fujita, Shuting Zhai, Tomás Sherwen, Naga Oshima, Ryu Uemura, Akinori Yamada, Nozomi Suzuki, Sumito Matoba, Asuka Tsuruta, Joel Savarino, Naohiro Yoshida

  Science Advances 7 (19) eabd4610 - eabd4610 2375-2548 2021/05 [Refereed]
   

  After the 1980s, atmospheric sulfate reduction is slower than the dramatic reductions in sulfur dioxide (SO₂) emissions. However, a lack of observational evidence has hindered the identification of causal feedback mechanisms. Here, we report an increase in the oxygen isotopic composition of sulfate (Δ17OSO42−) in a Greenland ice core, implying an enhanced role of acidity-dependent in-cloud oxidation by ozone (up to 17 to 27%) in sulfate production since the 1960s. A global chemical transport model reproduces the magnitude of the increase in observed Δ17OSO42− with a 10 to 15% enhancement in the conversion efficiency from SO₂ to sulfate in Eastern North America and Western Europe. With an expected continued decrease in atmospheric acidity, this feedback will continue in the future and partially hinder air quality improvements.
• StudiesonAtmosphere,Snow/Ice,andGlacialMicrobesonGreenlandIceSheetbySIGMAandrelevant projects─Alinkage to theArCS IIProject─

  青木輝夫, 的場澄人, 庭野匡思, 朽木勝幸, 谷川朋範, 竹内 望, 山口 悟, 本山秀明, 藤田耕史, 山崎哲秀, 飯塚芳徳, 堀 雅裕, 島田利元, 植竹 淳, 永塚尚子, 大沼友貴彦, 橋本明弘, 石元裕史, 田中泰宙, 大島 長, 梶野瑞王, 足立光司, 黒﨑 豊, 杉山 慎, 津滝 俊, 東久美子, 八久保晶弘, 川上 薫, 木名瀨健

  Seppyo 日本雪氷学会 83 (2) 169 - 191 0373-1006 2021/03 [Refereed]
  
• SurfaceenergybalanceobservedattheSIGMA-AsiteonthenorthwestGreenlandiceshee

  Hirose, S, Aoki, T, Niwano, M, Matoba, S, Tanikawa, T, Yamaguch, T, Yamasaki, T

  Seppyo 82 (2) 143 - 154 2021/03 [Refereed]
  
• Rapidly changing glaciers, ocean and coastal environments, and their impact on human society in the Qaanaaq region, northwestern Greenland

  Shin Sugiyama, Naoya Kanna, Daiki Sakakibara, Takuto Ando, Izumi Asaji, Ken Kondo, Yefan Wang, Yoshiki Fujishi, Shungo Fukumoto, Evgeniy Podolskiy, Yasushi Fukamachi, Minori Takahashi, Sumito Matoba, Yoshinori Iizuka, Ralf Greve, Masato Furuya, Kazutaka Tateyama, Tatsuya Watanabe, Shintaro Yamasaki, Atsushi Yamaguchi, Bungo Nishizawa, Kohei Matsuno, Daiki Nomura, Yuta Sakuragi, Yoshimasa Matsumura, Yoshihiko Ohashi, Teruo Aoki, Masashi Niwano, Naotaka Hayashi, Masahiro Minowa, Guillaume Jouvet, Eef van Dongen, Andreas Bauder, Martin Funk, Anders Anker Bjørk, Toku Oshima

  Polar Science 27 100632 - 100632 1873-9652 2021/03 [Refereed]
   

  Environments along the coast of Greenland are rapidly changing under the influence of a warming climate in the Arctic. To better understand the changes in the coastal environments, we performed researches in the Qaanaaq region in northwestern Greenland as a part of the ArCS (Arctic Challenge for Sustainability) Project. Mass loss of ice caps and marine-terminating outlet glaciers were quantified by field and satellite observations. Measurements and sampling in fjords revealed the important role of glacial meltwater discharge in marine ecosystems. Flooding of a glacial stream in Qaanaaq and landslides in a nearby settlement were investigated to identify the drivers of the incidents. Our study observed rapid changes in the coastal environments, and their critical impact on the society in Qaanaaq. We organized workshops with the residents to absorb local and indigenous knowledge, as well as to share the results and data obtained in the project. Continuous effort towards obtaining long-term observations requiring involvement of local communities is crucial to contribute to a sustainable future in Greenland.
• Increasing dust emission from ice free terrain in southeastern Greenland since 2000

  Tomomi Amino, Yoshinori Iizuka, Sumito Matoba, Rigen Shimada, Naga Oshima, Toshitaka Suzuki, Takuto Ando, Teruo Aoki, Koji Fujita

  Polar Science 27 100599 - 100599 1873-9652 2021/03 [Refereed]
   

  Mineral dust plays a key role in both local and global climates. At high latitudes, atmospheric dust can affect ice-nuclei formation, and surface dust can reduce the albedo as well as increase subsequent ice melting. As a proxy for past climate, mineral dust is preserved in ice cores, but few studies have examined deposited dust in ice cores during the Anthropocene, especially after 2000. We measured dust concentrations in an ice core at the southeastern dome in Greenland (SE-Dome), and reconstructed the annual and seasonal dust fluxes during 1960–2014. We find the annual average flux during 1960–2014 to be 34.8 ± 13.5 mg m yr , a value about twice that of ice cores further inland. The more recent part of that period, 2000–2014, has the higher annual flux of 46.6 ± 16.2 mg m yr . The annual and autumn dust fluxes highly correlate with air temperature in Tasiilaq (r = 0.61 and 0.50, respectively), a coastal location in southeastern Greenland. Our results suggest that the local dust emissions at the coastal region are increasing due to a decreasing seasonal snow-cover area arising from coastal Greenland warming after 2000. −2 −1 −2 −1
• New insights into snow-atmosphere interaction through light-absorbing particles

  Niwano Masashi, Kajino Mizuo, Kajikawa Tomoki, AOKI Teruo, Kodama Yuji, Tanikawa Tomonori, Matoba Sumito

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2021 83 - 83 1883-0870 2021
• Inclusions in ice layers of an ice core, Greenland

  Kawakami Kaoru, Iizuka Yoshinori, Matoba Sumito, Aoki Teruo, Sugiyama Shin, Ando Takuto

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2021 34 - 34 1883-0870 2021
• The analysis of water stable isotopes of the ice core from Trambau glacier, Nepal Himalaya

  Esashi Nao, Tsushima Akane, Uemura Ryu, Iizuka Yoshinori, Matoba Sumito, Fujita Koji

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2021 21 - 21 1883-0870 2021
• Isotopic evidence for changes in sulfate formation after SO2 emission control

  Hattori Shohei, Iizuka Yoshinori, Alexander Becky, Ishino Sakiko, Fujita Koji, Zhai Shuting, Sherwen Tomas, Oshima Naga, Uemura Ryu, Yamada Akinori, Suzuki Nozomi, Matoba Sumito, Tsuruta Asuka, Savarino Joel, Yoshida Naohiro

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 68 158  2021 

  大気中の硫酸の三酸素同位体組成は、大気中におけるSO2から硫酸への酸化過程における酸化剤の寄与率を反映して変動する。本研究では、グリーンランド南東ドームで採取された過去60年分のアイスコアを用い、その硫酸の三酸素同位体組成を分析することで、過去の大気化学反応の変化を復元した。硫酸の三酸素同位体組成は過去60年間で上昇し、SO2の液相O3酸化の寄与率が高くなっていたことを示した。硫酸の三酸素同位体組成の中和率やH+フラックスの変化とよく相関していた。SO2の液相O3酸化は酸性度が低いほど促進されることから、1980年代以降のSO2排出量の削減とアンモニア排出の増加による大気中酸性度の低下が促進の要因であると考えられる。このように、硫酸の三酸素同位体組成の分析によって、SO2排出規制にも関わらず硫酸エアロゾルの減少が鈍化するケミカルフィードバック機構の要因が、大気酸性度の低下によるSO2の液相O3酸化の促進であることが特定された。
• Spatial Distribution of the Input of Insoluble Particles Into the Surface of the Qaanaaq Glacier, Northwestern Greenland

  Sumito Matoba, Ryo Hazuki, Yutaka Kurosaki, Teruo Aoki

  Frontiers in Earth Science 8 2020/12/11 [Refereed]
   

  From glaciological observations, we found spatial variation in the input of insoluble particles (ISP) on a glacier surface from atmospheric deposition and outcropping at the surface of the glacier by surface ablation at the ablation area of the Qaanaaq Ice Cap in northwestern Greenland. Possible sources of ISP input to the glacier surface were outcropping at the surface of the glacier by ablation at intermediate and low elevations, and from atmospheric deposition at high elevations. The annual atmospheric deposition of ISP was larger at high elevations than at intermediate and low elevations. The annual abundance of outcropping ISP was larger at intermediate elevations than at low elevations, where the annual ablation rate of the glacier surface was 1.5 times larger than at intermediate elevations. The ISP concentration in the glacier ice at intermediate sites was approximately 10 times larger than at low sites. The water stable isotopes of glacier ice at intermediate sites indicated that glacier ice at the intermediate sites did not form since the last glacial maximum, possibly the Holocene Thermal Maximum. Therefore, the accumulation of the ISP, which is outcropping at the intermediate site, occurred at high elevations after Holocene Thermal Maximum.
• アイスコア—極域海氷—海洋エアロゾル研究の新展開

  飯塚芳徳, 的場澄人, 宮﨑雄三

  大気化学研究 44 2020/11 [Refereed]
  
• Sources and behavior of monsoon air masses in the lowest-latitude region on the Tibetan Plateau, and their paleoclimatic implications

  Mitsugu Nishimura, Tetsuya Matsunaka, Junbo Wang, Sumito Matoba, Akane Tsushima, Liping Zhu, Yasuhiro Izutsu

  Palaeogeography, Palaeoclimatology, Palaeoecology 554 109750 - 109750 0031-0182 2020/09 [Refereed][Not invited]
  
• Temporal and spatial variabilities in surface mass balance at the EGRIP site, Greenland from 2009 to 2017

  Yuki Komuro, Fumio Nakazawa, Motohiro Hirabayashi, Kumiko Goto-Azuma, Naoko Nagatsuka, Wataru Shigeyama, Sumito Matoba, Tomoyuki Homma, Jørgen Peder Steffensen, Dorthe Dahl-Jensen

  Polar Science 27 100568 - 100568 1873-9652 2020/08 [Refereed][Not invited]
  
• Reconstruction of sea ice concentration in northern Baffin Bay using deuterium excess in a coastal ice core from the northwestern Greenland Ice Sheet

  Yutaka Kurosaki, Sumito Matoba, Yoshinori Iizuka, Masashi Niwano, Tomonori Tanikawa, Takuto Ando, Akira Hori, Atsushi Miyamoto, Shuji Fujita, Teruo Aoki

  Journal of Geophysical Research: Atmospheres 125 (16) 2169-897X 2020/08 [Refereed][Not invited]
  
• Ice core records of levoglucosan and dehydroabietic and vanillic acids from Aurora Peak in Alaska since the 1660s: a proxy signal of biomass-burning activities in the North Pacific Rim

  Ambarish Pokhrel, Kimitaka Kawamura, Bhagawati Kunwar, Kaori Ono, Akane Tsushima, Osamu Seki, Sumio Matoba, Takayuki Shiraiwa

  Atmospheric Chemistry and Physics 20 (1) 597 - 612 1680-7316 2020/01/17 [Refereed][Not invited]
   

  Abstract. A 180 m long (343 years) ice core was drilled in the saddle of Aurora Peak in Alaska (63.52∘ N, 146.54∘ 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 long-range atmospheric transport than other species. These compounds showed significant correlations with global lower-tropospheric 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.
• Inclusions in ice layers of SIGMA-A ice core, northwestern Greenland

  Kawakami Kaoru, Iizuka Yoshinori, Matoba Sumito, Aoki Teruo, Sugiyama Shin, Ando Takuto

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2020 66 - 66 1883-0870 2020
• ArCS II Cryosphere Research 3 “Water and material circulations in seasonal sea ice regions and their impacts on environment in the Arctic”

  Matoba Sumito, Iizuka Yoshinori, Miyazaki Yuzo, Suzuki Toshitaka, Hattori Shohei, Uemura Ryu, Hara Keiichiro, Oshima Naga, Yamasaki Tetsuhide, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2020 111 - 111 1883-0870 2020
• Sulfate aerosol composition and flux during 1970’s derived from the SE-Dome ice core, Greenland

  Iizuka Yoshinori, Uemura Ryu, Matsui Hitoshi, Oshima Naga, Matoba Sumito

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2020 67 - 67 1883-0870 2020
• Atmospheric sea-salt and halogen cycles in the Antarctic

  Keiichiro Hara, Kazuo Osada, Masanori Yabuki, Sumito Matoba, Motohiro Hirabayashi, Shuji Fujita, Fumio Nakazawa, Takashi Yamanouchi

  Environmental Science: Processes & Impacts 22 (10) 2003 - 2022 2050-7887 2020 [Refereed][Not invited]
   

  Atmospheric sea-salt and halogen cycles play important roles in atmospheric science and chemistry including cloud processes and oxidation capacity in the Antarctic troposphere.

• Effects of snow grain shape and mixing state of snow impurity on retrieval of snow physical parameters from ground-based optical instrument

  Tanikawa, T, K. Kuchiki, T. Aoki, H. Ishimoto, A. Hachikubo, M. Niwano, M. Hosaka, S. Matoba, Y. Kodama, Y. Iwata, K. Stamnes

  Journal of Geophysical Researh 125 (15)  - accepted 2169-897X 2020 [Refereed][Not invited]
  
• Assessment for paleoclimatic utility of biomass burning tracers in SE-Dome ice core, Greenland

  Fahmida Parvin, Osamu Seki, Koji Fujita, Yoshinori Iizuka, Sumito Matoba, Takuto Ando, Ken Sawada

  Atmospheric Environment 196 86 - 94 1352-2310 2019/01 [Refereed][Not invited]
   

  © 2018 The Authors We provide continuous records of biomass burning molecular tracers (levoglucosan and dehydroabietic acid) in a Greenland ice core collected from the Southeastern Dome (the SE-Dome ice core) over the past several decades to assess the paleoclimatic utility of these tracers in Greenland ice cores. An air mass backward-trajectory analysis indicates that eastern Canada is likely the primary source region of the biomass burning tracers. Comparisons of levoglucosan and dehydroabietic acid data in the SE-Dome ice core and area burned (vegetation fire) events in Canada suggests that the biomass burning tracers in the ice core document most of the pronounced biomass burning events in eastern Canada over the past several decades, confirming that analyses of biomass burning molecular tracers in Greenland ice cores are useful to reconstruct the frequency of significant biomass burning events in a local region. However, our study also highlights that the wind pattern when the biomass burning occurs is decisive for the registration of a biomass burning event in an ice core even though long-term changes in the wind regime associated with decadal-scale climate oscillations do not significantly influence the transport and deposition of biomass burning tracers on the Greenland ice sheet.
• Seasonal variations and temporal trends of black carbon and dust in northwest Greenland over the past 350 years

  Goto-Azuma Kumiko, Matoba Sumito, Aoki Teruo, Moteki Nobuhiro, Ohata Sho, Mori Tatshuhiro, Koike Makoto, Komuro Yuki, Tsushima Akane, Nagatsuka Naoko, Shiegmaya Wataru, Ogawa-Tsukagawa Yoshimi, Fujita Koji, Kondo Yutaka, Remi Dallmayr, Hirabayashi Motohiro, Ogata Jun, Kitamura Kyotaro, Kawamura Kenji, Motoyama Hideaki

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2019 82 - 82 1883-0870 2019
• Glaciological traverse across the Southern Patagonian Icefield

  Masahiro MINOWA, Marius SCHAEFER, Pedro SKVARCA, Sumito MATOBA, Guisella GACITÚA

  Bulletin of Glaciological Research 37 (0) 47 - 56 1345-3807 2019 [Refereed][Not invited]
   

  To better understand the temporal variation of the ice surface elevation and the spatio-temporal variation of snow accumulation in the accumulation area of the Southern Patagonian Icefield, we carried out a glaciological traverse in October 2018. This included measurements of surface elevation, firn layers, and sampling of snow in the accumulation areas of Glaciar Viedma and Glaciar Pio XI. The main results from the traverse are: i) during the period of 2000-2018 the surface elevation in the accumulation area of Glaciar Viedma decreased by 1.7 m a(-1), but increased at Glaciar Pio XI by 0.4 m a(-1), ii) ground-penetrating radar revealed numerous firn layers with a continuous water aquifer at 20-40 m depth, iii) the water isotope ratio of surface snow samples varied with wind direction. Repeating the traverse in the area will provide an opportunity to answer questions about the contrasting glacier behavior and the snow accumulation rate, a necessary step to make reliable projections of future glacier behavior in Patagonia.
• Open-sea and sea-ice fluctuations in nearshore Beaufort Sea during the last deglaciation derived from ion concentrations in ice wedge

  Iizuka, Y, C. Miyamoto, S. Matoba, G. Iwahana, K. Horiuchi, Y. Takahashi, N. Kanna, K. Suzuki, H. Ohno

  Earth and Planetary Science Letter 515 58 - 66 2019 [Refereed][Not invited]
  
• Ion concentrations in ice wedges: An innovative approach to reconstruct past climate variability

  Iizuka Yoshinori, Miyamoto Chihiro, Matoba Sumito, Iwahana Go, Horiuchi Kazuho, Takahashi Yoshio, Kanna Naoya, Suzuki Koji, Ohno Hiroshi

  Earth and Planetary Science Letters 515 58 - 66 0012-821X 2019 [Refereed][Not invited]
   

  © 2019 Elsevier B.V. For atmospheric gases and aerosols, snow and ice provide a useful archive of paleoenvironmental history. In the northern hemisphere, this archive has been largely limited to Greenland ice, but promising pioneering work has been done recently using chronology of an ice wedge in Barrow, northern Alaska. Here, we investigate past aerosols at the same ice-wedge sampling site, reconstructing the sea-ice fluctuations in the adjacent Beaufort Sea during the Bølling/Allerød (BA) and Younger Dryas (YD) periods. We confirm the integrity of methanesulfonate ion (MS − ) concentrations in the BIWS as marine proxies, and then find that the ice wedge has a high MS − concentration through the beginning (coldest) YD periods. The high MS − concentration indicates that even during the coldest YD periods (12,900–12,700 yrBP), the near-shore region in the Alaskan Beaufort Sea near Barrow may not have been completely filled by permanent sea ice.
• Water stable isotope analysis of SIGMA-A ice core 2017 in north western part of Greenland Ice Sheet

  Yutaka Kurosaki, Sumito Matoba, Yoshinori Iizuka, Shin Sugiyama, Takuto Ando, Teruo Aoki

  Annual Report on Snow and Ice Studies in Hokkaido 37 91 - 94 2018/09 [Not refereed][Not invited]
  
• NHM-SMAP: Spatially and temporally high-resolution nonhydrostatic atmospheric model coupled with detailed snow process model for Greenland Ice Sheet

  Masashi Niwano, Teruo Aoki, Akihiro Hashimoto, Sumito Matoba, Satoru Yamaguchi, Tomonori Tanikawa, Koji Fujita, Akane Tsushima, Yoshinori Iizuka, Rigen Shimada, Masahiro Hori

  Cryosphere 12 (2) 635 - 655 1994-0424 2018/02/23 [Refereed][Not invited]
   

  To improve surface mass balance (SMB) estimates for the Greenland Ice Sheet (GrIS), we developed a 5ĝ€̄km resolution regional climate model combining the Japan Meteorological Agency Non-Hydrostatic atmospheric Model and the Snow Metamorphism and Albedo Process model (NHM-SMAP) with an output interval of 1ĝ€̄h, forced by the Japanese 55-year reanalysis (JRA-55). We used in situ data to evaluate NHM-SMAP in the GrIS during the 2011-2014 mass balance years. We investigated two options for the lower boundary conditions of the atmosphere: an offline configuration using snow, firn, and ice albedo, surface temperature data from JRA-55, and an online configuration using values from SMAP. The online configuration improved model performance in simulating 2ĝ€̄m air temperature, suggesting that the surface analysis provided by JRA-55 is inadequate for the GrIS and that SMAP results can better simulate physical conditions of snow/firn/ice. It also reproduced the measured features of the GrIS climate, diurnal variations, and even a strong mesoscale wind event. In particular, it successfully reproduced the temporal evolution of the GrIS surface melt area extent as well as the record melt event around 12 July 2012, at which time the simulated melt area extent reached 92.4ĝ€̄%. Sensitivity tests showed that the choice of calculation schemes for vertical water movement in snow and firn has an effect as great as 200ĝ€̄Gtĝ€̄year-1 in the GrIS-wide accumulated SMB estimates a scheme based on the Richards equation provided the best performance.
• A 60 Year Record of Atmospheric Aerosol Depositions Preserved in a High-Accumulation Dome Ice Core, Southeast Greenland

  Yoshinori Iizuka, Ryu Uemura, Koji Fujita, Shohei Hattori, Osamu Seki, Chihiro Miyamoto, Toshitaka Suzuki, Naohiro Yoshida, Hideaki Motoyama, Sumito Matoba

  Journal of Geophysical Research: Atmospheres 123 (1) 574 - 589 2169-897X 2018/01/16 [Refereed][Not invited]
   

  ©2017. American Geophysical Union. All Rights Reserved. The Southeastern Greenland Dome (SE-Dome) has both a high elevation and a high accumulation rate (1.01 m we yr−1), which are suitable properties for reconstructing past environmental changes with a high time resolution. For this study, we measured the major ion fluxes in a 90 m ice core drilled from the SE-Dome region in 2015 and present the records of annual ion fluxes from 1957 to 2014. From 1970 to 2010, the trend of nonsea-salt (nss) SO42− flux decreases, whereas that for NH4+ increases, tracking well with the anthropogenic SOx and NH3 emissions mainly from North America. The result suggests that these fluxes reflect histories of the anthropogenic SOx and NH3 emissions. In contrast, the decadal trend of NO3− flux differs from the decreasing trend of anthropogenic NOx emissions. Although the cause of this discrepancy remains unclear, it may be related to changes in particle formation processes and chemical scavenging rates caused by an increase in sea salt and dust and/or a decrease in nssSO42−. We also find a high average NO3− flux (1.13 mmol m−2 yr−1) in the ice core, which suggests a negligible effect from postdepositional NO3− loss. Thus, the SE-Dome region is an excellent location for reconstructing nitrate fluxes. Over a decadal time scale, our NO3− flux record is similar to those from other ice cores in Greenland high-elevation sites, suggesting that NO3− concentration records from these ice cores are reliable.
• Field activites at the SIGMA-A site, northwestern Greenland Ice Sheet, 2017

  Matoba, S, M. Niwano, T. Tanikawa, Y. Iizuka, T. Yamasaki, Y. Kurosaki, A. Hashimoto, M. Hosaka, S. Sugiyama

  Bullet. Glaciol. Res. 36 (0) 15 - 22 1345-3807 2018 [Refereed][Not invited]
  
• Effect of snow impurities on radiation budget in Sapporo

  Hirozawa Yoichiro, Aoki Teruo, Niwano Masashi, Matoba Sumito, Kodama Yuji, Tanikawa Tomonori

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2018 203  1883-0870 2018
• Past 60 years changes in oxidation pathways of tropospheric sulfur from triple oxygen isotopic composition of sulfate preserved in SE-Dome ice core

  Hattori Shohei, Iizuka Yoshinori, Uemura Ryu, Suzuki Nozomi, Tsuruta Asuka, Ishino Sakiko, Fujita Koji, Matoba Sumito, Yoshida Naohiro

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 65 12  2018 

  グリーンランドの氷床コアは北アメリカやヨーロッパ由来の大気が由来し、過去のエアロゾル動態を復元する貴重な環境媒体である。産業革命以降の人間活動の増大に伴い、大気中に放出される硫黄及び窒素酸化物の濃度が上昇し、1970年以降に北アメリカ、ヨーロッパで排出が抑制された。事実、氷床コア中の硫酸濃度の減少がSO2排出量の減少と対応していることが知られている。本研究では、グリーンランド南東ドーム(SE-Dome)で採取された約90 m、60年分のアイスコアを用い、時間解像度3~6年で硫酸の三酸素同位体組成を分析した。
• High-resolution analysis of black carbon in an ice core drilled at Northwest Greenland

  Goto-Azuma Kumiko, Matoba Sumito, Kadota Moe, Aoki Teruo, Moteki Nobuhiro, Ohata Sho, Mori Tatshuhiro, Koike Makoto, Komuro Yuki, Tsushima Akane, Nagatsuka Naoko, Ogawa-Tsukagawa Yoshimi, Fujita Koji, Kondo Yutaka, Dallmayr Remi, Hirabayashi Motohiro, Ogata Jun, Kitamura Kyotaro, Kawamura Kenji, Motoyama Hideaki

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2018 216 - 216 1883-0870 2018
• バフィン湾周辺の環境がグリーンランド北西部の降雪中のd-excessと化学成分に与える影響

  黒﨑豊, 的場澄人, 飯塚芳徳, 庭野匡思, 谷川朋範, 青木輝夫

  雪氷 80 (6) 515 - 529 2018 [Refereed][Not invited]
  
• Seasonal-Scale Dating of a Shallow Ice Core From Greenland Using Oxygen Isotope Matching Between Data and Simulation

  Ryoto Furukawa, Ryu Uemura, Koji Fujita, Jesper Sjolte, Kei Yoshimura, Sumito Matoba, Yoshinori Iizuka

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122 (20) 10873 - 10887 2169-897X 2017/10 [Refereed][Not invited]
   

  A precise age scale based on annual layer counting is essential for investigating past environmental changes from ice core records. However, subannual scale dating is hampered by the irregular intraannual variabilities of oxygen isotope (delta O-18) records. Here we propose a dating method based on matching the delta O-18 variations between ice core records and records simulated by isotope-enabled climate models. We applied this method to a new delta O-18 record from an ice core obtained from a dome site in southeast Greenland. The close similarity between the delta O-18 records from the ice core and models enables correlation and the production of a precise age scale, with an accuracy of a few months. A missing delta O-18 minimum in the 1995/1996 winter is an example of an indistinct delta O-18 seasonal cycle. Our analysis suggests that the missing delta O-18 minimum is likely caused by a combination of warm air temperature, weak moisture transport, and cool ocean temperature. Based on the age scale, the average accumulation rate from 1960 to 2014 is reconstructed as 1.02 m yr(-1) in water equivalent. The annual accumulation rate shows an increasing trend with a slope of 3.6 mm yr(-1), which is mainly caused by the increase in the autumn accumulation rate of 2.6 mm yr(-1). This increase is likely linked to the enhanced hydrological cycle caused by the decrease in Arctic sea ice area. Unlike the strong seasonality of precipitation amount in the ERA reanalysis data in the southeast dome region, our reconstructed accumulation rate suggests a weak seasonality.
• Frost flowers and sea-salt aerosols over seasonal sea-ice areas in northwestern Greenland during winter-spring

  Keiichiro Hara, Sumito Matoba, Motohiro Hirabayashi, Tetsuhide Yamasaki

  ATMOSPHERIC CHEMISTRY AND PHYSICS 17 (13) 8577 - 8598 1680-7316 2017/07 [Refereed][Not invited]
   

  Sea salts and halogens in aerosols, frost flowers, and brine play an important role in atmospheric chemistry in polar regions. Simultaneous sampling and observations of frost flowers, brine, and aerosol particles were conducted around Siorapaluk in northwestern Greenland during December 2013 to March 2014. Results show that water-soluble frost flower and brine components are sea-salt components (e.g., Na+, Cl-, Mg2+, K+, Ca2+, Br-, and iodine). Concentration factors of sea-salt components of frost flowers and brine relative to seawater were 1.14-3.67. Sea-salt enrichment of Mg2+, K+, Ca2+, and halogens (Cl-, Br-, and iodine) in frost flowers is associated with sea-salt fractionation by precipitation of mirabilite and hydrohalite. High aerosol number concentrations correspond to the occurrence of higher abundance of sea-salt particles in both coarse and fine modes, and blowing snow and strong winds. Aerosol number concentrations, particularly in coarse mode, are increased considerably by release from the sea-ice surface under strong wind conditions. Sulfate depletion by sea-salt fractionation was found to be limited in sea-salt aerosols because of the presence of non-sea-salt (NSS) SO42-. However, coarse and fine sea-salt particles were found to be rich in Mg. Strong Mg enrichment might be more likely to proceed in fine sea-salt particles. Magnesium-rich sea-salt particles might be released from the surface of snow and slush layer (brine) on sea ice and frost flowers. Mirabilite-like and ikaite-like particles were identified only in aerosol samples collected near new sea-ice areas. From the field evidence and results from earlier studies, we propose and describe sea-salt cycles in seasonal sea-ice areas.
• Global warming response of snowpack at mountain range in northern Japan estimated using multiple dynamically downscaled data

  Yuta Katsuyama, Masaru Inatsu, Kazuki Nakamura, Sumito Matoba

  COLD REGIONS SCIENCE AND TECHNOLOGY 136 62 - 71 0165-232X 2017/04 [Refereed][Not invited]
   

  We estimate the response of snowpack to global warming along with the uncertainty of the snowpack change by using a combination of multiple general-circulation models (GCMs), a single regional atmospheric model, and a one-dimensional multi-layered snowpack model. The target site is Mt. Annupuri in Kutchan, Hokkaido, Japan. The forcing of the snowpack model is taken from dynamically downscaled data from GCMs for the present climate and GCMs in a decade when the global-mean temperature has increased by 2 K from present conditions. The results show that global warming would decrease the monthly-mean snow depth throughout the winter season. Other salient features are the decrease of snow depth by 60 cm with maximum uncertainty of 20 cm at the beginning of the snow ablation period, the occurrence of the snow-depth peak a month earlier, and the dominance of melt forms in an earlier season. The ratio of melt forms for all snowpack layers increases with little uncertainty before the snow ablation period. The ratio of hoar does not change much, even though the air temperature increases. The uncertainty in snowpack evaluation is also discussed. (C) 2017 Elsevier B.V. All rights reserved.
• グリーンランド南東ドームにおける浅層掘削と初期物理解析

  飯塚芳徳, 的場澄人, 藤田秀二, 新堀邦夫, 山崎哲秀, 宮本淳, 堀彰, 斉藤健, 古川崚仁, 杉山慎, 青木輝夫

  低温科学 75 45 - 52 2017/03 [Not refereed][Not invited]
  
• Surface mass balance variations in a maritime area of the northwestern Greenland Ice Sheet

  的場澄人, 山口悟, 對馬あかね, 青木輝夫, 杉山慎

  低温科学 75 37 - 44 1880-7593 2017/03 [Not refereed][Not invited]
  
• A firn densification process in the high accumulation dome of southeastern Greenland

  Yoshinori Iizuka, Atsushi Miyamoto, Akira Hori, Sumito Matoba, Ryoto Furukawa, Takeshi Saito, Shuji Fujita, Motohiro Hirabayashi, Satoru Yamaguchi, Koji Fujita, Nozomu Takeuchi

  ARCTIC ANTARCTIC AND ALPINE RESEARCH 49 (1) 13 - 27 1523-0430 2017/02 [Refereed][Not invited]
   

  We examine a firn core from a dome in southeast Greenland that exhibits distinct firn densification. The ice was-20.9 degrees C at 20 m depth, and the core gives an average accumulation rate of 1.0 m w.e. yr(-1) in water equivalent. However, the close-off density of 830 kg m(-3) occurs at 83.4-86.8 m depth, which is about 20-m shallower than that obtained from two empirical models. Where the density p > 750 kg m(-3), the densification appears faster than that from the empirical models. As a result, compared to the empirical coefficient, the actual compactive viscosity coefficient is nonlinear and decreases at p > 750 kg m(-3), indicating that the fun with a higher density is softer than that from the empirical result. We argue here that the high accumulation rate creates a high overburden pressure in a short time. Thus, the relative softness of the firn may arise from (1) there being not enough time to form bonds between grains as strong as those in a lower accumulation-rate area, and similarly, (2) the dislocation density in the firn being relatively high.
• An Unreported Asian Dust (Kosa) Event in Hokkaido, Japan: A Case Study of 7 March 2016

  Teppei J. Yasunari, Masashi Niwano, Yasushi Fujiyoshi, Atsushi Shimizu, Masamitsu Hayasaki, Teruo Aoki, Arlindo M. da Silva, Brent N. Holben, Sumito Matoba, Naoto Murao, Sadamu Yamagata, Kyu-Myong Kim

  SOLA 13 96 - 101 1349-6476 2017 [Refereed][Not invited]
   

  Monitoring particulate matter is essential to alert the public about health risks. The Terra/MODIS true color image clearly captured a yellow band over Hokkaido prefecture in Japan on 7 March 2016. We investigated whether this event was an Asian dust (Kosa) transport or not with the ground-based observations in Sapporo and Takikawa in Hokkaido and NASA's MERRA-2 re-analysis data. The timing of increased particle number concentrations (PNCs; greater than 0.5 mu m) was clearly measured by a low-cost aerosol sensor at Sapporo and Takikawa in the early afternoon. For this particle size range, the PNC by this aerosol sensor had greater agreement with another commercial instrument for the 1-hourly mean data. The lidar data at Takikawa and NASA's AERONET at Sapporo also implied the increased dust particles (i.e., dominance of non-spherical and coarse particles, respectively), which supported that the PNC increase was due to the dust transport. The hourly PM2.5 data in Sapporo significantly increased in the evening rather than around the noon to early afternoon. We concluded that this event was judged as an Asian dust (Kosa) event in Hokkaido starting from the early afternoon, which was, however, not reported by Japan Meteorological Agency (JMA) based on their visible observations.
• Seasonal scale dating of a shallow ice core from Greenland using oxygen isotope matching between data and simulation

  Furukawa Ryoto, Uemura Ryu, Fujita Koji, Sjolte Jesper, Yoshimura Kei, Matoba Sumito, Iizuka Yoshinori

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 64 18 - 18 2017 

• The past 60 years variation of nitrogen isotopic composition of nitrate preserved in SE-Dome site, southeastern Greenland Ice Sheet

  Tsuruta Asuka, Hattori Shohei, Iizuka Yoshinori, Fujita Koji, Uemura Ryu, Matoba Sumito, Yoshida Naohiro

  Abstracts of Annual Meeting of the Geochemical Society of Japan 一般社団法人日本地球化学会 64 19 - 19 2017 

• Analysis of insoluble particles in the ice core from south-east dome, Greenland

  Amino Tomomi, Iizuka Yoshinori, Matoba Sumito

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 154 - 154 2017
• Understanding variation trend of δ¹⁷O and ¹⁷O-excess in an ice core drilled at the SIGMA-D site

  Tsushima Akane, Gkinis Vasileios, Goto-Azuma Kumiko, Matoba Sumito, Nagatsuka Naoko, Motoyama Hideaki, Fujita Koji, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 155 - 155 2017
• The past 60 years variations of sources and formation pathways of nitrate preserved in SE-Dome site, southeastern Greenland Ice Sheet

  Tsuruta Asuka, Hattori Shohei, Iizuka Yoshinori, Fujita Koji, Uemura Ryu, Matoba Sumito, Yoshida Naohiro

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 120 - 120 2017
• Variations in mineralogy of dust in ice core obtained from Northwestern Greenland Ice Sheet

  Nagatsuka Naoko, Goto-Azuma Kumiko, Tsushima Akane, Motoyama Hideaki, Matoba Sumito, Fujita Koji, Yamasaki Tetsuhide, Onuma Yukihiko, Minowa Masahiro, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 119 - 119 2017
• Field activities at the northwestern Greenland Ice Sheet (SIGMA-A site) in 2017

  Matoba Sumito, Niwano Masashi, Tanikawa Tomonori, Iizuka Yoshinori, Yamasaki Tetsuhide, Kurosaki Yutaka, Aoki Teruo, Hashimoto Akihiro, Hosaka Masahiro, Sugiyama Shin

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 288 - 288 2017
• Effect of snow impurities on albedo and radiative forcing in Sapporo

  Hirozawa Yoichiro, Aoki Teruo, Niwano Masashi, Matoba Sumito, Kodama Yuji, Tanikawa Tomonori

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 6 - 6 2017
• The characteristics of snowpack at the beginning of melting season at Qaanaaq ice cap, northwestern Greenland

  Hazuki Ryo, Kurosaki Yutaka, Matoba Sumito, Sugiyama Shin

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 190 - 190 2017
• Reconstruction of paleoclimate past 100 years from ice core at northwestern Greenland Ice Sheet

  Kurosaki Yutaka, Matoba Sumito, Iizuka Yoshinori, Aoki Teruo, Sugiyama Shin

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2017 191 - 191 2017
• Data publication of snow cover and meteorological observations conducted at Institute of Low Temperature Science, Hokkaido University in Sapporo

  Sumito Matoba, T. Aoki, M. Niwano, K. Kuchiki, Y. Kodama, S. Yamaguchi

  Annual report on Snow and Ice Studies in Hokkaido 35 135 - 136 2016/09 [Not refereed][Not invited]
  
• Ice core records of monoterpene- and isoprene-SOA tracers from Aurora Peak in Alaska since 1660s: Implication for climate change variability in the North Pacific Rim

  Ambarish Pokhrel, Kimitaka Kawamura, Kaori Ono, Osamu Seki, Pingqing Fu, Sumio Matoba, Takayuki Shiraiwa

  ATMOSPHERIC ENVIRONMENT 130 105 - 112 1352-2310 2016/04 [Refereed][Not invited]
   

  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.
• Seasonal variations in the major chemical species of snow at the South East Dome in Greenland

  Ikumi Oyabu, Sumito Matoba, Tetsuhide Yamasaki, Moe Kadota, Yoshinori Iizuka

  POLAR SCIENCE 10 (1) 36 - 42 1873-9652 2016/03 [Refereed][Not invited]
   

  We analyze snow-pit samples collected in May 2015 at the South East Dome (SE Dome) on the Greenland ice sheet. The analysis includes high-resolution records of delta D and delta O-18, as well as the major ions, CH3SO3-, Cl-, NO3-, SO42-, Na+, NH4+, K+, Ma(2+), and Ca2+. We find that the 3.55-m snow pit recorded temperature and aerosol proxies back to summer or autumn of 2014. This indicates a higher accumulation rate than those at other major drilling sites in Greenland. Due to this high accumulation rate, ion concentrations except Na+ are lower than those typical of the central Greenland ice sheet. Concerning seasonal variability, the Na+, Cl-, Ca2+, Mg2+, and NO3- vary similarly to other sites in Greenland, with the Na+ and Cl- peaking in winter to early spring, Ca2+ peaking in spring, Mg2+ peaking in winter to spring, and NO3- towards a peak in summer while showing smaller peaks in winter to spring. The NH4+ increased in spring, and SO42- increased in autumn to winter at SE Dome. On the other hand, the seasonal trend in the Cl-/Na+ ratio differs from those in the inland region. As we did not fully recover one seasonal cycle, some seasonal peaks may have been missed. (C) 2016 Elsevier B.V. and NIPR. All rights reserved.
• Temperature and accumulation rate reconstructions from the ice core in south-east dome, Greenland

  Furukawa Ryoto, Iizuka Yoshinori, Matoba Sumito, Uemura Ryu

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2016 31  1883-0870 2016 [Not refereed]
  
• The next deep ice coring in the Dome Fuji region, East Antarctica

  Kawamura Kenji, Motoyama H., Goto-Azuma K., Fujita S., Furukawa T., Nakazawa F., Aoki S., Azuma N., Abe-Ouchi A., Iizuka Y., Uemura R., Uchida T., Oono H., Kameda T., Suzuki T., Takata M., Hirabayashi M., Fujita K., Fukui K., Hori A., Horiuchi K., Matoba S., Miyamoto A.

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2016 194  1883-0870 2016
• Variability of black carbon in Greenland during the past 350 years at the SIGMA-D site - Preliminary results from Continuous Flow Analysis –

  Goto-Azuma Kumiko, Matoba Sumito, Kadota Moe, Aoki Teruo, Moteki Nobuhiro, Ohata Sho, Mori Tatshuhiro, Koike Makoto, Komuro Yuki, Tsushima Akane, Nagatsuka Naoko, Ogawa-Tsukagawa Yoshimi, Yutaka Yutaka, Dallmayr Remi, Hirabayashi Motohiro, Ogata Jun, Kitamura Kyotaro, Kawamura Kenji, Motoyama Motoyama

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2016 190 - 190 1883-0870 2016
• Temporal variation in iron flux deposition onto the northern North Pacific reconstructed from an ice core drilled at Mount Wrangell, Alaska

  Hirotaka Sasaki, Sumito Matoba, Takayuki Shiraiwa, Carl S. Benson

  Scientific Online Letters on the Atmosphere 12 287 - 290 1349-6476 2016 [Refereed][Not invited]
   

  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 flux 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.
• Glaciological and meteorological observations at the SE-Dome site, southeastern Greenland Ice Sheet

  Yoshinori Iizuka, Sumito Matoba, Tetsuhide Yamasaki, Ikumi Oyabu, Moe Kadota, Teruo Aoki

  Bulletin of Glaciological Research 34 (1) 1 - 10 1345-3807 2016 [Refereed][Not invited]
   

  In order to understand 1) temporal variations of anthropogenic aerosols from European regions under the Icelandic low with high time resolution, and 2) the snow densification mechanism at the high accumulation dome in Greenland, we drilled a 90.45m ice core in a high accumulation area of the southeastern Greenland Ice Sheet. The drilling site (SE-Dome 67.18°N, 36.37°W, 3170m a.s.l.) is located 185km north of the town of Tasiilaq in southeastern Greenland. We also conducted borehole temperature measurements. The temperature in the borehole was -20.9°C at a depth of 20m. In addition, we did snow-pit observations, aerosol sampling, snow sampling for chemical and physical analyses and meteorological observation. Air temperature and air pressure were on average -16.8°C and 667hPa during our stay. The aerosol concentration in the top surface 0.1m snow at SE-Dome in the spring of 2015 was lower than those of the other regions in Greenland, likely due to a highland dome of the ice sheet and/or dilution of mass flux by high snow accumulation.
• Operation of the gas-adsorption type instrument for measuring snow SSA in a fieldwork

  八久保, 晶弘, 山口, 悟, 堀, 雅裕, 谷川, 朋範, 杉浦, 幸之助, 的場, 澄人, 庭野, 匡思, 朽木, 勝幸, 青木, 輝夫

  北海道の雪氷 34 (34) 15 - 18 1340-7368 2015/09 [Not refereed][Not invited]
  
• Elemental carbon, organic carbon, and dust concentrations in snow measured with thermal optical and gravimetric methods: Variations during the 2007-2013 winters at Sapporo, Japan

  Katsuyuki Kuchiki, Teruo Aoki, Masashi Niwano, Sumito Matoba, Yuji Kodama, Kouji Adachi

  Journal of Geophysical Research 120 (2) 868 - 882 2156-2202 2015/01/27 [Refereed][Not invited]
   

  The mass concentrations of light-absorbing snow impurities at Sapporo, Japan, were measured during six winters from 2007 to 2013. Elemental carbon (EC) and organic carbon (OC) concentrations were measured with the thermal optical method, and dust concentration was determined by filter gravimetric measurement. The measurement results using the different filters were compared to assess the filtration efficiency. Adding NH4H2PO4 coagulant to melted snow samples improved the collection efficiency for EC particles by a factor of 1.45. The mass concentrations of EC, OC, and dust in the top 2 cm layer ranged in 0.007-2.8, 0.01-13, and 0.14-260 ppmw, respectively, during the six winters. Themass concentrations and their short-term variations were larger in the surface than in the subsurface. The snow impurity concentrations varied seasonally that is, they remained relatively low during the accumulation season and gradually increased during the melting season. Although the surface snow impurities showed no discernible trend over the six winters, they varied from year to year, with a negative correlation between the snow impurity concentrations and the amount of snowfall. The surface snow impurities generally increased with the number of days elapsed since snowfall and showed a different rate for EC (1.44), OC (9.96), and dust (6.81). The possible processes causing an increase in surface snow impurities were dry deposition of atmospheric aerosols, melting of surface snow, and sublimation/evaporation of surface snow.
• Observation of the snow pit and atmospheric aerosols at the South-East Dome in Greenland

  Oyabu Ikumi, Iizuka Yoshinori, Matoba Sumito, Yamasaki Tetsuhide, Kadota Moe

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2015 73 - 73 2015
• Reconstruction of climate during the past 157years by analyzing an ice core obtained from Northwestern Greenland Ice Sheet (SIGMA-D)

  Kadota Moe, Matoba Sumito, Motoyama Hideaki, Fujita Koji, Yamasaki Tetsuhide, Onuma Yukihiko, Minowa Masahiro, Komuro Yuki, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2015 191 - 191 2015
• Analysis of the total concentration of metals in the Greenland, SIGMA-D shallow ice core

  Komuro Yuki, Suzuki Toshitaka, Onuma Yukihiko, Minowa Masahiro, Yamasaki Tetsuhide, Matoba Sumito, Fujita Koji, Hirabayashi Motohiro, Motoyama Hideaki, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2015 166 - 166 2015
• Glaciological and meteorological observations at the SIGMA-D site, northwestern Greenland Ice Sheet

  Matoba, S., Motoyama, H., Fujita, K., Yamasaki, T., Minowa, M., Onuma, Y., Komuro, Y., Aoki, T., Yamaguchi, S., Sugiyama, S., Enomoto, H.

  Bulletin of Glaciological Research 33 7 - 14 2015 [Refereed][Not invited]
  
• Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012

  M. Niwano, T. Aoki, S. Matoba, S. Yamaguchi, T. Tanikawa, K. Kuchiki, H. Motoyama

  CRYOSPHERE 9 (3) 971 - 988 1994-0416 2015 [Refereed][Not invited]
   

  The surface energy balance (SEB) from 30 June to 14 July 2012 at site SIGMA (Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic)-A, (78 degrees 03'N, 67 degrees 38'W; 1490 ma.s.l.) on the northwest Greenland Ice Sheet (GrIS) was investigated by using in situ atmospheric and snow measurements as well as numerical modeling with a one-dimensional multi-layered physical snowpack model called SMAP (Snow Metamorphism and Albedo Process). At SIGMA-A, remarkable near-surface snowmelt and continuous heavy rainfall (accumulated precipitation between 10 and 14 July was estimated to be 100 mm) were observed after 10 July 2012. Application of the SMAP model to the GrIS snowpack was evaluated based on the snow temperature profile, snow surface temperature, surface snow grain size, and shortwave albedo, all of which the model simulated reasonably well. Above all, the fact that the SMAP model successfully reproduced frequently observed rapid increases in snow albedo under cloudy conditions highlights the advantage of the physically based snow albedo model (PBSAM) incorporated in the SMAP model. Using such data and model, we estimated the SEB at SIGMA-A from 30 June to 14 July 2012. Radiation-related fluxes were obtained from in situ measurements, whereas other fluxes were calculated with the SMAP model. By examining the components of the SEB, we determined that low-level clouds accompanied by a significant temperature increase played an important role in the melt event observed at SIGMA-A. These conditions induced a remarkable surface heating via cloud radiative forcing in the polar region.
• Elemental carbon, organic carbon, and dust concentrations in snow measured with thermal optical and gravimetric methods: Variations during the 2007-2013 winters at Sapporo, Japan

  Katsuyuki Kuchiki, Teruo Aoki, Masashi Niwano, Sumito Matoba, Yuji Kodama, Kouji Adachi

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 120 (2) 868 - 882 2169-897X 2015/01 [Refereed][Not invited]
   

  The mass concentrations of light-absorbing snow impurities at Sapporo, Japan, were measured during six winters from 2007 to 2013. Elemental carbon (EC) and organic carbon (OC) concentrations were measured with the thermal optical method, and dust concentration was determined by filter gravimetric measurement. The measurement results using the different filters were compared to assess the filtration efficiency. Adding NH4H2PO4 coagulant to melted snow samples improved the collection efficiency for EC particles by a factor of 1.45. The mass concentrations of EC, OC, and dust in the top 2cm layer ranged in 0.007-2.8, 0.01-13, and 0.14-260ppmw, respectively, during the six winters. The mass concentrations and their short-term variations were larger in the surface than in the subsurface. The snow impurity concentrations varied seasonally; that is, they remained relatively low during the accumulation season and gradually increased during the melting season. Although the surface snow impurities showed no discernible trend over the six winters, they varied from year to year, with a negative correlation between the snow impurity concentrations and the amount of snowfall. The surface snow impurities generally increased with the number of days elapsed since snowfall and showed a different rate for EC (1.44), OC (9.96), and dust (6.81). The possible processes causing an increase in surface snow impurities were dry deposition of atmospheric aerosols, melting of surface snow, and sublimation/evaporation of surface snow.
• Validation of the SNOWPACK model using snow pit observation data

  Hirashima, H, Yamaguchi, S, Kosugi, K, Nemoto, M, Aoki, T, Matoba, S

  Seppyo 77 (1) 5 - 16 0373-1006 2015/01 [Refereed][Not invited]
  
• Reconstruction of recent climate change in Alaska from the Aurora Peak ice core, central Alaska

  A. Tsushima, S. Matoba, T. Shiraiwa, S. Okamoto, H. Sasaki, D. J. Solie, K. Yoshikawa

  CLIMATE OF THE PAST 11 (2) 217 - 226 1814-9324 2015 [Refereed][Not invited]
   

  A 180.17m ice core was drilled at Aurora Peak in the central part of the Alaska Range, Alaska, in 2008 to allow reconstruction of centennial-scale climate change in the northern North Pacific. The 10m depth temperature in the borehole was -2.2 degrees C, which corresponded to the annual mean air temperature at the drilling site. In this ice core, there were many melt-refreeze layers due to high temperature and/or strong insolation during summer seasons. We analyzed stable hydrogen isotopes (delta D) and chemical species in the ice core. The ice core age was determined by annual counts of delta D and seasonal cycles of Na+, and we used reference horizons of tritium peaks in 1963 and 1964, major volcanic eruptions of Mount Spurr in 1992 and Mount Katmai in 1912, and a large forest fire in 2004 as age controls. Here, we show that the chronology of the Aurora Peak ice core from 95.61m to the top corresponds to the period from 1900 to the summer season of 2008, with a dating error of +/- 3 years. We estimated that the mean accumulation rate from 1997 to 2007 (except for 2004) was 2.04mw.eq.yr(-1). Our results suggest that temporal variations in delta D and annual accumulation rates are strongly related to shifts in the Pacific Decadal Oscillation index (PDOI). The remarkable increase in annual precipitation since the 1970s has likely been the result of enhanced storm activity associated with shifts in the PDOI during winter in the Gulf of Alaska.
• Ice core profiles of saturated fatty acids (C-12:0-C-30:0) and oleic acid (C-18:1) from southern Alaska since 1734 AD: A link to climate change in the Northern Hemisphere

  Ambarish Pokhrel, Kimitaka Kawamura, Osamu Seki, Sumio Matoba, Takayuki Shiraiwa

  ATMOSPHERIC ENVIRONMENT 100 202 - 209 1352-2310 2015/01 [Refereed][Not invited]
   

  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.
• In situ measurements of polarization properties of snow surface under the brewster geometry in hokkaido, Japan, and northwest greenland ice sheet

  Tomonori Tanikawa, Masahiro Hori, Teruo Aoki, Akihiro Hachikubo, Katsuyuki Kuchiki, Masashi Niwano, Sumito Matoba, Satoru Yamaguchi, Knut Stamnes

  Journal of Geophysical Research 119 (24) 13 - 964 2156-2202 2014/12/27 [Refereed][Not invited]
   

  Ground-based measurements of spectral degree of linear polarization (DLP) of various snow types were made during intensive field campaigns in a snowfield in Hokkaido, Japan, and on the northwest Greenland ice sheet in 2012. Spectral measurements were conducted under the solar zenith angle of approximately the Brewster angle in order to quantify the polarization properties of light reflected from snow. We obtained spectral DLPs for five different snow types in both field campaigns including precipitation particles, needles, surface hoar, melt forms, and melt freeze crust covering the snow surface. The measurements showed that in the visible region the spectral dependence of the DLP was small while in the near infrared region it increased with increasing snow grain size with some distinct local peaks. The angular dependence indicated that the DLP exhibited small angular dependence in the visible region while in the near-infrared region it exhibited large and broad peaks in the forward direction. Especially for the melt-freeze crust, the DLP approached 1.0 at wavelengths close to λ = 1.5 and 2.0 μm. These features can be explained by (1) the relative contribution of surface versus volume scattering to the reflected light, (2) the incident angle (solar zenith angle) of approximately the Brewster angle, and (3) the ratio between direct and diffuse components of the solar radiation incident on the snow surface. The spectral DLP was found to be quiet sensitive to the incident solar radiation and solar elevation as well as snow optical properties. Comparison between the spectral DLP and snow grain size obtained by snow pit work shows that the DLP for λ > 1.5 μm was very sensitive to large snow grains close to the surface. This finding suggests that polarization measurements obtained from airborne/satellite polarimeters will be useful for surface snow grain size retrievals and help improve the accuracy of such retrievals based on the intensity-only measurements, especially for the large snow grain sizes.
• In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet

  Tomonori Tanikawa, Masahiro Hori, Teruo Aoki, Akihiro Hachikubo, Katsuyuki Kuchiki, Masashi Niwano, Sumito Matoba, Satoru Yamaguchi, Knut Stamnes

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 119 (24) 13946 - 13964 2169-897X 2014/12 [Refereed][Not invited]
   

  Ground-based measurements of spectral degree of linear polarization (DLP) of various snow types were made during intensive field campaigns in a snowfield in Hokkaido, Japan, and on the northwest Greenland ice sheet in 2012. Spectral measurements were conducted under the solar zenith angle of approximately the Brewster angle in order to quantify the polarization properties of light reflected from snow. We obtained spectral DLPs for five different snow types in both field campaigns including precipitation particles, needles, surface hoar, melt forms, and melt freeze crust covering the snow surface. The measurements showed that in the visible region the spectral dependence of the DLP was small while in the near infrared region it increased with increasing snow grain size with some distinct local peaks. The angular dependence indicated that the DLP exhibited small angular dependence in the visible region while in the near-infrared region it exhibited large and broad peaks in the forward direction. Especially for the melt-freeze crust, the DLP approached 1.0 at wavelengths close to lambda = 1.5 and 2.0 mu m. These features can be explained by (1) the relative contribution of surface versus volume scattering to the reflected light, (2) the incident angle (solar zenith angle) of approximately the Brewster angle, and (3) the ratio between direct and diffuse components of the solar radiation incident on the snow surface. The spectral DLP was found to be quiet sensitive to the incident solar radiation and solar elevation as well as snow optical properties. Comparison between the spectral DLP and snow grain size obtained by snow pit work shows that the DLP for lambda > 1.5.. m was very sensitive to large snow grains close to the surface. This finding suggests that polarization measurements obtained from airborne/satellite polarimeters will be useful for surface snow grain size retrievals and help improve the accuracy of such retrievals based on the intensity-only measurements, especially for the large snow grain sizes.
• Wet and dry deposition of mineral dust particles in Japan: factors related to temporal variation and spatial distribution

  Osada, K., Ura, S., Kagawa, M., Mikami, M., Tanaka, T. Y., Matoba, S., Aoki, K., Shinoda, M., Kurosaki, Y., Hayashi, M., Shimizu, A., Uematsu, M.

  Atmospheric Chemistry and Physics 14 (2) 1104 - 1121 2014 [Refereed][Not invited]
  
• Chemicalcompositionofsurfacesnowandice,andprecipitationon QiyiGlacier,QilianMountains,westernChina

  Takayuki MIYAKE, Jun UETAKE, Sumito MATOBA, Akiko SAKAI, Koji FUJITA, Yoshiyuki FUJII, Tandong YAO, Masayoshi NAKAWO

  Seppyo 76 (1) 3 - 17 2014/01 [Refereed][Not invited]
  
• Initial field observations on Qaanaaq ice cap, northwestern Greenland

  Shin Sugiyama, Daiki Sakakibara, Satoshi Matsuno, Satoru Yamaguchi, Sumito Matoba, Teruo Aoki

  ANNALS OF GLACIOLOGY 55 (66) 25 - 33 0260-3055 2014 [Refereed][Not invited]
   

  To study the glaciological processes controlling the mass budget of Greenland's peripheral glaciers and ice caps, field measurements were carried out on Qaanaaq ice cap, a 20 km long ice cap in northwestern Greenland. In the summer of 2012, we measured surface melt rate, ice flow velocity and ice thickness along a survey route spanning the ice margin (200 m a.s.l.) to the ice-cap summit (1110 m a.s.l.). Melt rates in the ablation area were clearly influenced by dark materials covering the ice surface, where degree-day factors varied from 5.44 mm w.e. K-1 d(-1) on a clean surface to 8.26 mm w.e. K-1 d(-1) in the dark regions. Ice velocity showed diurnal variations, indicating the presence of surface-meltwater induced basal sliding. Mean ice thickness along the survey route was 120 m, with a maximum thickness of 165m. Ice velocity and temperature fields were computed using a thermomechanically coupled numerical glacier model. Modelled ice temperature, obtained by imposing estimated annual mean air temperature as the surface boundary condition, was substantially lower than implied by the observed ice velocity. This result suggests that the ice dynamics and thermodynamics of the ice cap are significantly influenced by heat transfer from meltwater and changing ice geometry.
• 降雨と融雪が重なって生じる融雪出水(2) —3カ年の模擬降雨散水実験の比較—

  石井吉之, 中坪俊一, 森章一, 的場澄人

  北海道の雪氷 32 29 - 32 2014/01 [Not refereed][Not invited]
  
• Long-term variation of light-absorbing snow impurities in Sapporo, Japan

  Katsuyuki Kuchiki, Aoki Teruo, Niwano Masashi, Matoba Sumito, Kodama Yuji

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2014 158  1883-0870 2014
• Alpine ice-core drilling in the North Pacific region

  Sumito Matoba, Kunio Shimbori, Takayuki Shiraiwa

  ANNALS OF GLACIOLOGY 55 (68) 83 - 87 0260-3055 2014 [Refereed][Not invited]
   

  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.
• Spatial variations of δ18O and ion species in the snowpack of the northwestern Greenland ice sheet

  Sumito Matoba, Tetsuhide Yamasaki, Morihiro Miyahara, Hideaki Motoyama

  Bulletin of Glaciological Research 32 (1) 79 - 84 1345-3807 2014 [Refereed][Not invited]
   

  To determine the transport processes of water vapor and aerosols over the northwestern Greenland ice sheet, we undertook a glaciological observation at a coastal site on the northwestern part of the ice sheet and revealed spatial variations in δ18O and in the concentrations of chemical substances in surface snow and the snowpack. On the outlet glacier (the Meehan glacier), water vapor and sea salt were transported from the coast. On the inland ice sheet in northwestern Greenland, water vapor, mineral dust, anthropogenic substances such as NO3- and SO42-, and CH3SO3- from marine phytoplankton were transported from the west coast of Greenland via the central part of the Greenland ice sheet. © Japanese Society of Snow and Ice.
• Relation between SSA and grain size of snow

  Akihiro Hachikubo, Martin Schneebeli, Satoru Yamaguchi, Masahiro Hori, Tomonori Tanikawa, Konosuke Sugiura, Sumito Matoba, Masashi Niwano, Katsuyuki Kuchiki, Teruo Aoki

  Hokkaido no Seppyo 33 (33) 121 - 124 1340-7368 2014 [Not refereed][Not invited]
  
• Glaciological observations in 2012 and 2013 at SIGMA-A site, Northwest Greenland

  Satoru Yamaguchi, Sumito Matoba, Tetsuhide Yamazaki, Akane Tsushima, Masashi Niwano, Tomonori Tanikawa, Teruo Aoki

  Bulletin of Glaciological Research 32 (1) 95 - 105 1345-3807 2014 [Refereed][Not invited]
   

  Glaciological observations were conducted in 2012 and 2013 at the SIGMA-A site on the northwest Greenland ice sheet (78° 03'06"N, 67° 37'42"W, 1490 m a.s.l.) as part of the Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic (SIGMA) project. The meteorological conditions during the two observations were quite different. The meteorological condition during the 2012 observation period was warm, and heavy rainfall occurred during the observation period, thus the snow was very wet. In contrast, the meteorological condition during the observation period in 2013 was cold, with a blowing snow event, thus the snow was quite dry. The glaciological observations in 2012 consisted of 1) snow-stake measurements, 2) snow pit observations, 3) grain size observations for validation of satellite-derived snow products, 4) snow specific surface area measurements using a near-infrared camera, 5) snow sampling for chemical analyses, and 6) drilling of firn cores with a hand auger. The glaciological observations in 2013 consisted of 1) snow-stake measurements, 2) snow pit observations, and 3) snow sampling for chemical analyses. © Japanese Society of Snow and Ice.
• Effects of temperature and grain type on time variation of snow specific surface area

  Akihiro Hachikubo, Satoru Yamaguchi, Hayato Arakawa, Tomonori Tanikawa, Masahiro Hori, Konosuke Sugiura, Sumito Matoba, Masashi Niwano, Katsuyuki Kuchiki, Teruo Aoki

  Bulletin of Glaciological Research 32 (1) 47 - 53 1345-3807 2014 [Refereed][Not invited]
   

  The specific surface area (SSA) of snow is of particular interest to researchers because SSA is strongly related to snow albedo and is a comparatively better indicator of snow's complexity than grain size. The time variation of SSA for fresh snow samples was observed in the laboratory under isothermal conditions at 226 K and 254 K using the gas adsorption method and Brunauer-Emmett-Teller theory. The SSA of the snow samples decreased with time under isothermal metamorphism. The decrease in SSA was fitted with the logarithmic equation proposed by Legagneux et al. (2003), and adjustable parameters were obtained. The rate of decrease in SSA depended on the shape of the initial snow type and temperature. Dendritic snow samples exhibited large initial SSAs, and their SSAs decreased faster compared with those of fragmented (collected from drifting snow) and plate-like precipitation particles with relatively small initial SSAs. The rate of decrease in SSA was lower at 226 K than that at 254 K. © Japanese Society of Snow and Ice.
• Dependence of thermal infrared emissive behaviors of snow cover on the surface snow type

  Masahiro Hori, Teruo Aoki, Tomonori Tanikawa, Katsuyuki Kuchiki, Masashi Niwano, Satoru Yamaguchi, Sumito Matoba

  Bulletin of Glaciological Research 32 (1) 33 - 45 1345-3807 2014 [Refereed][Not invited]
   

  The potential of the thermal infrared (TIR) remote sensing for discriminating surface snow types was examined by analyzing TIR radiances acquired from space over the Greenland ice sheet. The brightness temperature difference (BTD) between TIR wavelengths of 11 and 12μm was found to increase in accordance with in situ observed evolutions of surface snow type. Spatial and temporal distributions of BTD over the entire ice sheet indicated that BTD has a sensitivity of about 1.2 K for variations of the possible snow types. The observed behaviors of BTD were coincident with those predicted by a radiative transfer calculation using previous in situ measured snow emissivities, although some biases on the order of 0.1-0.3 K remain. The dependence of BTD on the surface snow type was also consistent with the behaviors of snow reflectance at the shortwave infrared (SWIR) wavelength 1.6μm, which is a measure of snow grain size, except for the case of melting wet snow. The inconsistency in the wet snow case was considered to be due to the different optical responses of the TIR and SWIR signals to wet snow, which suggested the possibility of using TIR signals to discriminate wet/dry conditions of snow cover in an old stage. As a result, it is determined that TIR remote sensing has potential not only as an approach supplementary to the SWIR method for assessing surface snow types in daytime but also as the only method for simultaneous retrieval of snow type and surface temperature in nighttime. © Japanese Society of Snow and Ice.
• Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012

  Teruo Aoki, Sumito Matoba, Satoru Yamaguchi, Tomonori Tanikawa, Masashi Niwano, Katsuyuki Kuchiki, Kouji Adachi, Jun Uetake, Hideaki Motoyama, Masahiro Hori

  Bulletin of Glaciological Research 32 (1) 21 - 31 1345-3807 2014 [Refereed][Not invited]
   

  Light-absorbing snow impurities of elemental carbon (EC), organic carbon (OC), and mineral dust have been measured at three locations at elevations from 1,469 to 1,992 m on August 1, 2011, and at the site SIGMA-A (78oN, 68oW, elevation 1,490 m) on the northwest Greenland ice sheet (GrIS) during the period from June 28 to July 12, 2012. At SIGMA-A, a remarkable snow surface lowering together with snow melting was observed during the observation period in 2012, when a record surface melting event occurred over the GrIS. The concentrations in the surface were 0.9, 3.8, and 107 ppbw for EC, OC, and dust, respectively, at the beginning of the period, which increased to 4.9, 17.2, and 1327 ppbw for EC, OC, and dust, respectively, at the end. The EC and dust concentrations were remarkably higher than those at the three locations in 2011 and the recent measurements at Summit. However, our measurements for EC and OC could be underestimated because a recent study indicates that the collection efficiency of a quartz fiber filter, which we employed, is low. We confirm that the snow surface impurity concentrations were enhanced in the observation period, which can be explained by the effects of sublimation/evaporation and snow melt amplification associated with drastic melting. Scanning electron microscopy analysis of surface snow impurities on July 12 revealed that the major component of snow impurities is mineral dust with size larger than 5 μm, which suggests possible emission source areas are peripheral bare soil regions of Greenland and/or the Canadian Arctic. © Japanese Society of Snow and Ice.
• Field activities of the "Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic" (SIGMA) Project in Greenland in 2011-2013

  Teruo Aoki, Sumito Matoba, Jun Uetake, Nozomu Takeuchi, Hideaki Motoyama

  Bulletin of Glaciological Research 32 (1) 3 - 20 1345-3807 2014 [Refereed][Not invited]
   

  Field activities of the "Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic" (SIGMA) Project in Greenland in the summer season of 2011-2013 are reported this consists of (1) glaciological and meteorological observations and (2) biological observations. In 2011, we conducted a field reconnaissance in the Qaanaaq, Ilulissat and Kangerlussuaq areas to enable continuous meteorological observations with automatic weather stations (AWS), campaign observations for glaciology, meteorology and Biology and shallow ice core drilling, which were planned for 2012-2014. Based on the results, we chose the Qaanaaq area in northwest Greenland as our main activity area and the Kangerlussuaq area in mid-west Greenland partly for biological observations. In 2012, we conducted field observations for (1) and (2) mentioned above together with installations of two AWSs at site SIGMA-A on The Greenland ice sheet (GrIS) and at site SIGMA-B on the Qaanaaq ice cap (QIC) from June to August. Surface snow and ice over all of the QIC melted in July and August 2012, and most of the Glacier surface appeared to be dark-colored, probably due to mineral dust and glacial microbial products. In 2013, we carried out similar observations in the Qaanaaq area. However, the weather and Glacier surface conditions were considerably different from those in 2012. Snow cover over the summer of 2013 remained over large areas with elevations higher than about 700 m on QIC. Biological activity on the Glacier surface appears to be substantially lower as compared to that in 2012. © Japanese Society of Snow and Ice.
• 降雨と融雪が重なって生じる融雪出水 —3カ年の模擬降雨散水実験の比較—

  石井吉之, 中坪俊一, 森章一, 的場澄人

  北海道の雪氷 31 104 - 107 2012/09 [Not refereed][Not invited]
  
• Study of precise measurement for borehole temperature in glacier and ice sheet

  Motoyama Hideaki, Furusaki Atsushi, Takahashi Hiromu, Takata Morimasa, Takahashi Akiyoshi, Miyahara Morihiro, Motoba Sumito, Sugiyama Shin, Iizuka Yoshinori, Shinbori Kunio

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2012 161 - 161 2012
• Chemical properties of snow cover at the northwestern Greenland Ice Sheet

  Matoba Sumito, Uetake Jun, Aoki Teruo

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2012 151 - 151 2012
• Mass concentration of snow impurities in Sapporo during the 5 winters from 2007 to 2012

  Kuchiki Katsuyuki, Aoki Teruo, Niwano Masashi, Kodama Yuji, Matoba Sumito

  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research 公益社団法人 日本雪氷学会／日本雪工学会 2012 81 - 81 2012
• Air-borne Fe deposition and solubility in precipitation estimated from alpine ice-core study

  Matoba Sumito, Sasaki Hirotaka, Shiraiwa Takayuki

  Abstracts of Annual Meeting of the Geochemical Society of Japan 日本地球化学会 58 244 - 244 2011 

  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。
• Glacier flow measurement and radio-echo sounding at Aurora Peak, Alaska, in 2008

  Takehiro Fukuda, Shin Sugiyama, Sumito Matoba, Takayuki Shiraiwa

  ANNALS OF GLACIOLOGY 52 (58) 138 - 142 0260-3055 2011 [Refereed][Not invited]
   

  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.
• Records of sea-ice extent and air temperature at the Sea of Okhotsk from an ice core of Mount Ichinsky, Kamchatka

  Sumito Matoba, Takayuki Shiraiwa, Akane Tsushima, Hirotaka Sasaki, Yaroslav D. Muravyev

  ANNALS OF GLACIOLOGY 52 (58) 44 - 50 0260-3055 2011 [Refereed][Not invited]
   

  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.
• Temporal and Spatial Variations of Wet Deposition Flux of Mineral Dust in Japan

  Osada, K., Ura, S., Kagawa, M., Mikami, M., Tanaka, T. Y., Matoba, S., Aoki, K., Shinoda, M., Kurosaki, Y., Hayashi, M., Shimizu, A., Uematsu, M.

  Sola 7 49 - 52 1349-6476 2011 [Refereed][Not invited]
  
• Estimation of Mineral Dust Amount Using Fe Content in Water-Insoluble Residue of Atmospheric Deposition Samples

  Ura, Sachiho, Osada, Kazuo, Kagawa, Masako, Mikami, Masao, Matoba, Sumito, Aoki, Kazuma, Shinoda, Masato, Kurosaki, Yasunori, Hayashi, Masahiko, Shimizu, Atsushi, Uematsu, Mitsuo

  Earozoru Kenkyu 26 (3) 234 - 241 2011 [Refereed][Not invited]
  
• Nutrient distributions associated with snow and sediment-laden layers in sea ice of the southern Sea of Okhotsk

  Daiki Nomura, Jun Nishioka, Mats A. Granskog, Andreas Krell, Sumito Matoba, Takenobu Toyota, Hiroshi Hattori, Kunio Shirasawa

  MARINE CHEMISTRY 119 (1-4) 1 - 8 0304-4203 2010/04 [Refereed][Not invited]
   

  Samples of first-year sea ice, snow and under-ice water were collected in the southern Sea of Okhotsk in mid-February 2007 and 2008 to elucidate the processes controlling nutrient concentrations in sea ice. Temperature, salinity, oxygen isotopic ratio (delta O-18) and inorganic nutrient concentrations (NO3, NH4, NO2, PO4 and SiO2) were measured. Sea ice was categorized into four types; snow-ice, frazil ice, columnar ice and a mixture of granular and columnar ice, based on delta O-18 composition and ice texture. Frazil ice dominated the total ice thickness (52.8%), and columnar ice was sandwiched between frazil ice layers, indicating dynamic ice-growth processes such as rafting and ridging. Furthermore, the ice was banded by layers of particulate materials (sediment layers), which were frequently encountered during cruises. High NO3 and NH4 concentrations were found in snow and snow-ice implying that these were supplied from the atmosphere with snowfall and incorporated into the sea ice through snow-ice formation. In the sediment-laden layers, which were categorized as frazil ice, NO2, PO4 and SiO2 concentrations were highest of all the ice types and considerably enriched compared to parent seawater, suggesting the remineralization of the particulate organic matter. On the other hand, NO3 concentrations in sediment layers were low (depleted), leading to extremely low N (NO3 + NH4 + NO2): P ratios in sediment layers, from 0.2 to 0.8, with respect to that of under-ice water or Redfield ratio. These results suggest that in part of sediment-laden layers fixed-nitrogen was removed partially as molecular nitrogen (N-2) from the sea ice environment by anaerobic nitrate reduction processes (denitrification) by denitrifying bacteria while adding phosphate from associated remineralization of organic phosphorus. The effect of melting of snow and sea ice is dilution for salinity, NO3 and SiO2, no change in NO2 and PO4, and a minor enrichment for NH4 in the mixed layer in spring and early summer. This suggests that snow/ice meltwater with different nutrient ratios than in under-ice water/Redfield ratio is supplied to under-ice water during melt season in April/May in southern Sea of Okhotsk. However, the impact of sediment-laden sea ice cannot be assessed at this point. (C) 2009 Elsevier B.V. All rights reserved.
• A snow algal community on the surface and ice an ice core of Rikha-Samba Glacier in Western Nepalii Himalayas

  Takeuchi, N, K. Fujita, F. Nakazawa, S. Matoba, M. Nakawo, B. Rana

  Bulletin of Glaciological Research 27 25 - 35 2009 [Refereed][Not invited]
  
• Constituent elements of insoluble and non-volatile particles during the Last Glacial Maximum exhibited in the Dome Fuji (Antarctica) ice core

  Yoshinori Iizuka, Takayuki Miyake, Motohiro Hirabayashi, Toshitaka Suzuki, Sumito Matoba, Hideaki Motoyama, Yoshiyuki Fujii, Takeo Hondoh

  JOURNAL OF GLACIOLOGY 55 (191) 552 - 562 0022-1430 2009 [Refereed][Not invited]
   

  In order to find environmental signals based on the dust and calcium-ion concentrations in ice cores, we determine the constituent elements of residue particles obtained after melting ice samples. We have designed a sublimating system that operates at -45 degrees C, below the eutectic temperatures of major salts. This system permits us to obtain a great many non-volatile particles. After studying the nonvolatile particles, we immersed them in water to remove soluble particles and compounds. We thereby analyzed a total of 1272 residue particles (from the melted sample), 2418 non-volatile particles (after sublimation) and 1463 insoluble particles taken from five sections of Last Glacial Maximum ice from the Dome Fuji (Antarctica) ice core. Their constituent elements were determined by scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM-EDS) and compared to the dust, calcium-ion and sodium-ion concentrations measured by ion chromatography. Our results indicate that >99.9% of the insoluble particles contain silicon but no sulfur, nitrogen or chlorine. A significant number of the non-volatile particles, however, contain sulfur and chlorine. We conclude that insoluble dust consists mostly of silicate, that almost all calcium ions originate from calcium sulfate and that almost all sodium ions originate from sodium sulfate and sodium chloride.
• Seasonality of snow accumulation at Mount Wrangell, Alaska, USA

  Syosaku Kanamori, Carl S. Benson, Martin Truffer, Sumito Matoba, Daniel J. Solie, Takayuki Shiraiwa

  JOURNAL OF GLACIOLOGY 54 (185) 273 - 278 0022-1430 2008 [Refereed][Not invited]
   

  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.
• Glacier mass balance interpreted from biological analysis of firn cores in the Chilean lake district

  P. Santibanez, S. Kohshima, R. Scheihing, J. Jaramillo, T. Shiraiwa, S. Matoba, D. Kanda, P. Labarca, G. Casassa

  JOURNAL OF GLACIOLOGY 54 (186) 452 - 462 0022-1430 2008 [Refereed][Not invited]
   

  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 (similar to 10m) firn/ice cores. Three cores were retrieved, two at Volcan Mocho-Choshuenco (39 degrees 55' S, 72 degrees 02' W; summit at 2422 m a.s.l; east glacier at 2000 m a.s.l.), and one at the summit of Volcan Osorno (41 degrees 06' S, 72 degrees 30' W; 2652 m a.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, delta D 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 mass-balance estimations from the Volcan 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.
• Estimation of net accumulation rate at a Patagonian glacier by ice core analyses using snow algae

  Shiro Kohshima, Nozomu Takeuchi, Jun Uetake, Takayuki Shiraiwa, Ryu Uemura, Naohiro Yoshida, Sumito Matoba, Maria Angelica Godoi

  GLOBAL AND PLANETARY CHANGE 59 (1-4) 236 - 244 0921-8181 2007/10 [Refereed][Not invited]
   

  Snow algae in a 45-97-m-long ice core from the Tyndall Glacier (50 degrees 59'05 '' S, 73 degrees 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 (180, 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(+), Mg(2+) Ca(2+), Cl(-), SO(4)(2-)) 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, (18)O, 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(-1) from 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 of 180 (17.8 m a(-1) from summer 1998 to summer 1999 and 11.0 m from summer to December 1999) and those of D-excess (14.7 m a(-1) from fall 1998 to fall 1999 and 8.6 m a(-1) from 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. (C) 2006 Elsevier B.V. All rights reserved.
• Interpretation of detailed density profile on Mt. Wrangell, Alaska

  KANAMORI Syosaku, SHIRAIWA Takayuki, MATOBA Sumito, YASUNARI Teppei

  Preprints of the Annual Conference, Japanese Society of Snow and Ice 公益社団法人 日本雪氷学会 2007 2 - 2 0919-7346 2007
• The fluctuation of iron concentration in an ice core of Mt. Wrangell, Alaska

  Sasaki Hirotaka, Matoba Sumito, Shiraiwa Takayuki

  Preprints of the Annual Conference, Japanese Society of Snow and Ice 公益社団法人 日本雪氷学会 2007 126 - 126 0919-7346 2007
• The glaciological expedition to Mount Ichinsky, Kamchatka, Russia

  Matoba, S, S. V. Ushakov, K. Shimbori, H. Sasaki, T. Yamasaki, A. A. Ovshannikov, A. G. Manevich, T. M. Zhideleeva, S. Kutuzov, Y. D. Muravyev, T. Shiraiwa

  Bulletin of Glaciological Research Japanese Society of Snow and Ice 24 79 - 85 1345-3807 2007 [Refereed][Not invited]
   

  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.
• Stable isotope records recovered from ice cores in Mt.Wrangell , Alaska

  Toida Takeshi, Shiraiwa Takayuki, Matoba Sumito

  Preprints of the Annual Conference, Japanese Society of Snow and Ice 公益社団法人 日本雪氷学会 2006 170 - 170 0919-7346 2006
• Chemical composition of surface ice at July 1st Glacier, Qilian Mountains, China

  Miyake Takayuki, Uetake Jun, Matoba Sumito, Sakai Akiko, Fujita Koji, Fujii Yoshiyuki, Yao Tandong, Nakawo Masayoshi

  Preprints of the Annual Conference, Japanese Society of Snow and Ice 公益社団法人 日本雪氷学会 2006 202 - 202 0919-7346 2006
• Meteorological observation at July 1st Glacier in northwest China from 2002 to 2005

  A. Sakai, Y. Matsuda, K. Fujita, S. Matoba, J. Uetake, K. Satow, K. Duan, J. Pu, M. Nakawo, T. YAO

  Bulletin of Glaciological Research 23 23 - 32 1345-3807 2006 [Refereed][Not invited]
  
• Preliminary observations of sub-surface and shallow ice core at July 1st Glacier, China in 2002-2004

  J. Uetake, A. Sakai, Y. Matsuda, K. Fujita, H. Narita, S. Matoba, K. Duan, M. Nakawo, T. Yao

  Bulletin of Glaciological Research 23 85 - 93 1345-3807 2006 [Refereed][Not invited]
  
• New Method of Detecting Kosa (Asian Dust) from SPM Data Measured by Environmental Air Monitoring Stations

  MATOBA Sumito, MORI Ikuko, HAYAKARI Susumu, NISHIKAWA Masataka

  Earozoru Kenkyu 日本エアロゾル学会 20 (3) 225 - 230 0912-2834 2005 [Refereed][Not invited]
   

  We developed a new method for detecting Kosa (Asian dust) days from the suspended particulate matter (SPM) concentrations measured at seven air-quality monitoring stations in western Japan. When the frequency curve of the horary SPM concentration monitored at each station from January to May showed a bimodal distribution, we assigned a threshold value to extract the distribution of higher concentration. When the days with high SPM concentration were in agreement over a wide area, we defined them as SPM Kosa days. There were 101 SPM Kosa days from 1993 to 2001. Through the analysis of the distribution of atmospheric pressure and the back trajectory analysis, we confirmed that the present method was able to detect 100 Kosa days out of 101, including the Kosa days which were not detected visually because of its weak event. There were 20 SPM Kosa days in 1999, which was the maximum number of Kosa days observed during 1993-2001.
• Scientific prospect of a certified reference material for study on the urban dust in China

  Sun, Z, M. Nishikawa, Z. Wu, I. Mori, S. Matoba

  Proceedings of China-Japan Joint Symposium on Environmental Chemistry 170 - 172 2004 [Refereed][Not invited]
  
• Comparison of atmospheric particulate pretreatment method for ICP-AES anaysis

  Mori, I, Matoba, S, Sano, T, Di, Y, Quan, H, Nishikawa, M

  Proceedings of China-Japan Joint Symposium on Environmental Chemistry 207 - 208 2004 [Refereed][Not invited]
  
• Chemical characteristics in a 22-m ice core on the Belukha Glacier, Russia

  Y. Iizuka, K. Fujita, S. Matoba, Y. Fujii, K. Matsuki, M. Kohno, V.B. Aizen

  Polar Meteorology and Glaciology 国立極地研究所 18 114 - 120 1344-3437 2004 [Refereed][Not invited]
   

  To better understand how the chemical composition of a glacier in an inland continental region relates to the local climate, we collected ice core samples from the Belukha Glacier, Russia, in July 2001. We analyzed the samples for pH, anions, and cations. The primary soluble ions were SO42-, NO3-, NH4+, Ca2+, and HCOO-. Moreover, we argue the following. 1) Ca2+ and its equivalent SO42-+ NO3- likely originated from terrestrial dust such as soil. 2) HCOO- and its equivalent NH4+ likely originated from vegetation and/or biomass burning. 3) The remaining SO42-+NO3- and NH4+ likely originated from livestock, commercial fertilizers, and natural fertilizers. 4) The NH4+ concentration was low when there was no contribution from vegetation and/or biomass burning.
• Parallel testing of continuous monitoring equipment for PM2.5 and annual variation in PM2.5/SPM ratio

  Matoba, S, Mori, I, Hasegawa, S, Tanabe, K, Nishikawa, M

  Proceedings of China-Japan Joint Symposium on Environmental Chemistry 310 - 311 2004 [Not refereed][Not invited]
  
• Report on the cross-checks on snow samplings and chemical analyses carried out in the "Yuki-Gasshuku (Snow Camp) 2002" held by the Subcommittee on Snow and Ice Chemistry

  MATOBA Sumito

  Journal of the Japanese Association of Snow and Ice The Japanese Society of Snow and Ice 65 (3) 317 - 321 0373-1006 2003/05/15 

  2002年1月16日に北海道雨竜郡幌加内町字母子里にある北海道大学低温科学研究所融雪観測室・露場にて行われた「雪合宿」において,化学分析のための積雪採取方法とイオンクロマトグラフィによる積雪中の化学主成分の定量方法のクロスチェックが行われた.6方法での試料採取・処理を行った.その結果,積雪から試料瓶に直接採取する方法では深さ方向に均一にサンプリングできず,結果が他と異なることが分かった.その他の方法には大きな問題が見つからなかった.化学主成分の定量は,5機関にて行われた.K⁺は積雪中の濃度が低く,かつ定量限界が高いため分析値にばらつきが見られた.他の成分については,特徴的な測定値のばらつきが見られた研究機関もあったが,大きな問題は見つからなかった.
• A 320 k-year record of microparticles in the Dome Fuji, Antarctica ice core measured by laser-light scattering

  Y. Fujii, M. Kohno, S. Matoba, H. Motoyama, O. Watanabe

  Mum. Natl. Inst. Polar Res. Spec. Issue, "Global Scale Climate and Environment Study through Polar Deep Ice Cores" 57 46 - 62 2003 [Refereed][Not invited]
   

  A laser-light scattering method was evaluated from the viewpoint of the measurement ability of concentration and size distribution of microparticles in molten ice core samples. It was demonstrated that analysis can be performed with 10 % accuracy by diluting the sample with ultrapure water by 50 times to eliminate coincidence loss. Using this method, the concentration and size distribution of microparticles were determined on 2829 samples from a 2503 m deep ice core drilled at Dome Fuji, Antarctica. The present paper shows the profiles of number and volume concentrations through the whole depth and the changes in the size distribution through three glacial cycles in the past 320 k-years.
• An overview of the Japanese glaciological studies on Mt. Logan, Yukon Territory, Canada in 2002

  K. Goto-Azuma. T, Shiraiwa, S. Matoba, T Segawa, S. Kanamori, Y, Fujii, T. Yamasaki

  Bulletin of Glaciological Research 20 65 - 72 2003 [Refereed][Not invited]
  
• Ice core drilling at King Col, Mount Logan 2002

  T. Shiraiwa, K. Goto-Azuma, S. Matoba, T. Yamasaki, T. Segawa, S. Kanamori, K. Matsuoka, Y. Fujii

  Bulletin of Glaciological Research 20 57 - 63 2003 [Refereed][Not invited]
  
• Anthropogenic trace metals in an ice core at Vestfonna, Svalbard, Norway

  S. Matoba, H. Narita, H. Motoyama, O. Watanabe

  Chinese Journal of Polar Science 14 (1) 41 - 47 2003 [Refereed][Not invited]
  
• Ice core chemistry of Vestfonna Ice Cap in Svalbard, Norway

  S Matoba, H Narita, H Motoyama, K Kamiyama, O Watanabe

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 107 (D23) doi:10.1029/2002JD002205  2169-897X 2002/12 [Refereed][Not invited]
   

  [1] Chemical analyses were done on samples from a 2.2-m deep snow pit and a 211-m deep ice core that came from the top of the Vestfonna Ice Cap in Nordaustlandet, Svalbard, Norway. The snow pit samples showed that the temperature increased during the winter owing to advection of warm air from the south, and delta(18)O did not show a seasonal cycle. Chronology of the ice core was determined by tritium analysis and comparison to the signal from the volcanic eruption of Laki; the resulting accumulation rate was 0.34-0.35 m water eq. yr(-1) for the last 400 years. The delta(18)O profile in the ice core revealed a warm period from 1920 up to the present in Svalbard. According to nonseasalt (nss) SO42- and NO3- concentrations, anthropogenic substances had increased from 1940s but declined from 1970s to the present. The variation of nss SO42- and the increase of NO3- can be explained by an increase of SO2 and NOx emissions from Eurasia. The decline of NO3- is assumed to be caused either by a change in the transport process or by a change of NOx emissions from Europe.
• Experimental results on improved JARE deep ice core drill - Experiments in Rikubetsu, Hokkaido in 2002

  Takao Kameda, Yoshiyuki Fujii, Akiyoshi Takahashi, Yoichi Tanaka, Hideki Narita, Kunio Shinbori, Nobuhiko Azuma, Teruo Furukawa, Takayasu Yoshimoto, Morihiro Miyahara, Makoto Igarashi, Mika Kohno, Sumito Matoba, Yoko Toyama, Kazuhide Satow, Shuhei Takahashi, Okitsugu Watanabe

  Antarctic Record 46 (2) 377 - 398 0085-7289 2002/07 

  Deep ice coring to bedrock (3028 m in depth) at Dome Fuji Station is planned during three successive summer seasons starting from 2003/2004. An improved JARE deep ice core drill (12.2 m in length and 3.8 m in maximum core length) was developed in December 2001 for the ice coring at Dome Fuji. In January/ February of 2002, we performed experiments on drill performance using artificial ice blocks in Rikubetsu, Hokkaido. In this paper, we outline the experiment and report the results. It was found through the experiment that an ice core of 3.8 m length was smoothly obtained by the improved drill with three screws in the chip chamber and cutting pitch of 5 mm/cycle. About 45000 small holes 1.2 mm in diameter were made on the surface of the chip chamber. These small holes enabled liquid to circulate between cutters and outside of the drill through the chip chamber in the drill. The dry density of the chips was 440 to 500 kg/m3 and the chip recovery rate during ice coring was 65 to 91%. A check valve installed at the bottom of the chip chamber to prevent outflow of chips from the drill was not tested enough, but more durability is needed for the valve. The newly developed motor system and core catchers of the drill worked perfectly. The average coring speed was 24.5 cm/min with cutting pitch of 5 mm/ cycle. The average power consumption during ice coring was 171 W.
• High net accumulation rates at Campo de Hielo Patagónico Sur, South America, revealed by analysis of a 45.97 m long ice core

  T, Shiraiwa, S. Kohshima, R. Uemura, N. Yoshida, S. Matoba, J. Uetake, M.A. Godoi

  Annals of Glaciology 19 25 - 31 2002 [Refereed][Not invited]
  
• Linear and non-linear relations between the high-frequency-limit conductivity, AC-ECM signals and ECM signals of Dome F Antarctic ice core from a laboratory experiment

  S Fujita, N Azuma, H Motoyama, T Kameda, H Narita, S Matoba, M Igarashi, M Kohno, Y Fujii, O Watanabe

  ANNALS OF GLACIOLOGY, VOL 35 35 321 - 328 0260-3055 2002 [Refereed][Not invited]
   

  Laboratory experiments were done to better understand the electrical conduction mechanisms of impure, polycrystalline ice as represented by the 2503 in Dome Fuji (Antarctica) ice core. Also, two electrical measurement techniques for ice cores were 9 compared and their usefulness for determining the acidity of ice cores was studied. We measured the electrical conductivity and complex permittivity of 167 slab-ice samples at frequencies from 20 Hz to I MHz. Measurements were performed at -21degreesC for all samples, and at -110degrees to -20degreesC for several samples, to examine the effects of temperature. We found linear relations between the AC loss factor and the molarity of sulfuric acid, and between the high-frequency-limit conductivity and the AC loss factor. Thus, the acidity levels can be determined from the AC loss factor. In contrast, the electrical conductivity measurement (ECM) current correlated weakly with the other parameters; furthermore, the correlation worsens at larger signal. In several samples containing high acidity, the dielectric properties had distinct changes near -81 degreesC. We argue that these changes were caused by a change from a liquid-vein-mediated conduction mechanism above the eutectic point of the solute/water/ice system to a solid-phase conduction mechanism at lower temperatures.
• tudies on climatic and environmental changes during the last few hundred years using ice cores from various sites in Nordaustlandet, Svalbard

  O. Watanabe, H. Motoyama, M. Igarashi, K. Kamiyama, S. Matoba, K. Goto-Azuma, H. Narita, T. Kameda

  Memoirs of national Institute of Polar Researc h Special Issue, "Environmental Research in the Arctic 2000" 227 - 242 2002 [Refereed][Not invited]
  
• Meteorological observation and chemical compositions of precipitation during the winter and spring season in 1997/98 at Siorapaluk, northwestern Greenland

  S. Matoba, T. Yamasaki, H. Motoyama

  Bulletin of Glaciological Research 19 25 - 31 2002 [Refereed][Not invited]
  
• Regional characteristics of chemical constituents in surface snow, Arctic cryosphere

  H. Motoyama, O. Watanabe, K. Kamiyama, M. Igarashi, K. Goto-Azuma, Y. Fujii, Y. Iizuka, S. Matoba, H. Narita, T. Kameda

  Polar Meteorol. and Glaciol. 国立極地研究所 15 55 - 66 1344-3437 2001 [Refereed][Not invited]
   

  Surface snow observations were carried out on many glaciers in the Arctic. The observational sites were in Svalbard, Severnaya Zemlya, Greenland and arctic Canada. The seasonal variations of chemical constituents in snowfall remained in the surface snow on the central Greenland ice sheet where the effect of snowmelt was weak. Conversely, the chemical constituents in the snow layer changed with infiltration of melt water on the Svalbard glacier where strong snowmelt occurred, even in high latitudes. But in general, specific regional characteristics remained in all the glaciers. The concentrations of ions in snow were significantly decreased, because of percolation of melt water. But the ratio of NO_3 to Cl still had unique regional characteristic values.
• Tephra layers in the Dome Fuji (Antarctica) deep ice core

  Y Fujii, M Kohno, H Motoyama, S Matoba, O Watanabe, S Fujita, N Azuma, T Kikuchi, T Fukuoka, T Suzuki

  ANNALS OF GLACIOLOGY, VOL 29, 1999 29 126 - 130 0260-3055 1999 [Refereed][Not invited]
   

  A deep ice core drilled to 2503 m depth at Dome Fuji, Antarctica, contains 25 visible tephra layers during the past 340 ka. The thickness of tephra layers is in the range 1-24 mm. The thickness and duration at deposition, determined by a simple ice-flow model, suggests that a violent volcanic eruption caused ash to fall onto the Antarctic ice sheet for similar to 5 years and to form a similar to 100 mm thick tephra layer at 117 ka sp. Two tephra layers at depths of 573 and 2202 m probably originated from volcanoes in the South Sandwich Islands, Southern Ocean, given the size of tephra shards, >20 mu m in diameter, and their major chemical composition. Only eight of the 25 tephra layers call also be recognized in the Vostok (Antarctica) ice core, but all correspond to the Vostok tephras if we consider cloudy bands to be volcanic.
• Basic analyses of Dome Fuji deep ice core Part1: Stable oxygen and hydrogen isotope ratios, major chemical compositions and dust concentration

  O. Watanabe, Y. Fujii, K. Kamiyama, H. Motoyama, T. Furukawa, M. Igarashi, M. Kohno, S. Kanamori, N. Kanamori, Y. Ageta, M. Nakawo, H. Tanaka, K. Satow, H. Shoji, K. Kawamura, S. Matoba, W. Shimada

  Polar Meteorology and Glaciology 国立極地研究所 13 83 - 89 1344-3437 1999 [Refereed][Not invited]
   

  Basic chemical analyses of a 2503m deep ice core obtained at Dome Fuji Station, Antarctica in 1995-1996 were carried out to determine stable oxygen and hydrogen isotope ratios, major chemical compositions and microparticle concentrations. We here describe the analytical procedure and the results as well as the determination of working time scale. The ice core covers the past 340ka which includes three glacial-interglacial cycles clearly shown by the stable oxygen isotope profile. Major chemical compositions and microparticle concentrations larger than 0.52μm show high concentrations in glacials and low in interglacials.
• 氷コア中の微量金属元素の定量法の開発と金属元素から見たスバールバルの環境変動

  的場 澄人

  1998 [Not refereed][Not invited]
  
• Determination of trace elements in an arcitc ice core by ICP/MS with a desolvated micro-concentric nebulizer

  S. Matoba, M. Nishikawa, O. Watanabe, Y. Fujii

  Journal of Environmental Chemistry Japan Society for Environmental Chemistry 8 (3) 421 - 427 0917-2408 1998 [Refereed][Not invited]
   

  Concentrations of trace elements in an ice core obtained in the polar region have been determined by inductively coupled plasma mass spectrometry (ICP-MS) . For trace metals in the ice core, sample uptake and high sensitivity for analysis are also important due to the limited volume of sample and the low concentrations of analytes. A desolvated micro-concentric nebulizer (MCN-6000), which is a recent development and offers high nebulizer efficiency at low sample consumption volume, in combination with ICP-MS, permitted multi-element determination of ppt levels of Al, V, Cr, Fe, Cu, Zn, As, Ag, Cd, Pb and U within a 2ml sample from a ice core obtained from the Vestfonna ice cap (89° 58' N, 21° 02' E) in Nordaustlandet, Svalbard. The contamination on the ice core exterior was removed with a stepwise melting process. The concentrations of Al, Fe, Cu, Zn and Pb were determined from the results of this analysis.
• 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. 国立極地研究所 11 14 - 23 0914-2037 1997 [Refereed][Not invited]
   

  An ice core from the glacier surface down to 112.59m depth was obtained in 1993 at Dome Fuji Station. The ice core was divided vertically in the home cold laboratory and various analyses were carried out for the solid and liquid phases of core samples. The measurements of numbers of microparticles, electrical conductivity, pH, oxygen isotopic ratio and chemical constituents were carried out for the melted ice core samples. In this report, the procedures and the methods for the measurements are introduced with results obtained. The results open preliminary step on ice core research at Dome Fuji Station, which should be useful to evaluate the environments at the dome in the comparison with core analyses at various sites. The vertical distributions for the some of the values obtained are presented to facilitate further discussion of the past climate and environments.
• Characteristics of AC-ECM signals obtained by use of the Vestfonna ice core, Svalbard

  K. Matsuoka, H. Narita, K. Sugiyama, S. Matoba, H. Motoyama, O. Watanabe

  Proc. of the NIPR Symp. Polar Meteorol. and Glaciol 国立極地研究所 11 67 - 75 0914-2037 1997 [Refereed][Not invited]
   

  AC-ECM measurements of the Vestfonna ice core were carried out under the following conditions : at -12,-17,-22 and -27℃ under 1MHz; at -22℃ under frequencies from 300kHz to 1MHz. The relationship between conductance measured with AC-ECM and acidity was linear. It is considered that salt impurities also affect to the AC-ECM signals. However, we focus on the effect of acidity, because it is known that the effect of acid on the a. c. conductance is 3.6 times as large as that of salt from DEP analysis of the Dolleman ice core. The intercept of the linear regression is coincident with the conductance of pure ice; at -23℃, it is 3.6nS. The gradient, conductance increases raised acid, is 0.70nS l/μmol at -23℃. The gradients at four temperatures were well fitted with the Arrhenius equation and activation energy is 24.8kJ/mol. Activation energy obtained from this study, the Dolleman ice core and acid-doped ice agree with each other within the error range. The conductance at -22℃ increases monotonically from 300kHz to 1MHz. This tendency is not caused by the system but by impurities in the specimen. The ratio between the conductance at 300kHz and at 1MHz is 0.845. This can not explain with one Debye dispersion. These results add basic knowledge for radio-echo soundings, especially at percolation zone in the ice cap.

MISC

• Inclusions in ice layers formed by melting and refreezing processes in a Greenland ice core

  川上薫, 川上薫, 飯塚芳徳, 的場澄人, 青木輝夫, 安藤卓人  雪氷研究大会講演要旨集(Web)  2022-  2022
• Estimation of spatiotemporal snow water equivalent evolutions in Japan using the Japan Meteorological Agency LFM-SMAP model system

  庭野匡思, 庭野匡思, 酢谷真巳, 長屋幸一, 山口悟, 的場澄人, 原田育郎, 大河原望  雪氷研究大会講演要旨集(Web)  2022-  2022
• Temporal variation of surface energy balance and surface mass balance at SIGMA-B site, northwest Greenland

  西村基志, 青木輝夫, 庭野匡思, 的場澄人, 谷川朋範, 山口悟, 山崎哲秀  雪氷研究大会講演要旨集(Web)  2022-  2022
• Development of Handheld Integrating Sphere Snow Grain Sizer(HISSGraS)

  青木輝夫, 青木輝夫, 八久保晶弘, 庭野匡思, 庭野匡思, 的場澄人, 谷川朋範, 西村基志, 石元裕史, 島田利元, 井上崚, GALLET Jean-Charles, 堀雅裕, 山口悟  雪氷研究大会講演要旨集(Web)  2022-  2022
• New insights into snow-atmosphere interaction through light-absorbing particles

  庭野匡思, 庭野匡思, 梶野瑞王, 梶野瑞王, 梶川友貴, 青木輝夫, 兒玉裕二, 谷川朋範, 的場澄人  雪氷研究大会講演要旨集(Web)  2021-  2021
• Cloud forcing effect on surface energy balance at the SIGMA-B site on Qaanaaq ice cap, northwest Greenland

  西村基志, 青木輝夫, 青木輝夫, 庭野匡思, 的場澄人, 谷川朋範, 山口悟, 山崎哲秀  雪氷研究大会講演要旨集(Web)  2021-  2021
• Spectral properties on linear polarization of snow and sea ice

  谷川朋範, 青木輝夫, 青木輝夫, 石元裕史, 増田一彦, 庭野匡思, 堀雅裕, 八久保晶弘, 的場澄人, 杉浦幸之助, 島田利元, 大河原望  雪氷研究大会講演要旨集(Web)  2020-  2020
• Relationships between satellite-derived snow/ice parameters and albedo over Greenland Ice Sheet

  青木輝夫, 青木輝夫, 島田利元, 堀雅裕, 庭野匡思, 谷川朋範, 的場澄人  雪氷研究大会講演要旨集(Web)  2020-  2020
• Temporal variation of meteorological condition observed at SIGMA-B site on Qaanaaq Ice Cap, northwestern Greenland

  Nishimura Motoshi, Aoki Teruo, Niwano Masashi, Matoba Sumito, Tanikawa Tomonori, Yamaguchi Satoru, Yamasaki Tetsuhide  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2020-  116  -116  2020
• Inclusions in ice layers of SIGMA-A ice core, northwestern Greenland

  川上薫, 川上薫, 飯塚芳徳, 的場澄人, 青木輝夫, 杉山慎, 安藤卓人  雪氷研究大会講演要旨集(Web)  2020-  2020
• Temporal variation of meteorological condition observed at SIGMA-B site on Qaanaaq Ice Cap, northwestern Greenland

  西村基志, 青木輝夫, 青木輝夫, 庭野匡志, 的場澄人, 谷川朋範, 山口悟, 山崎哲秀  雪氷研究大会講演要旨集(Web)  2020-  2020
• English-Japanese Translation of the International Classification for Seasonal Snow on the Ground - An Activity Report of Snow Classification Working Group-

  Matoba Sumito, Toshihiro Ozeki, Hachikubo Akihiro, Harada Yusuke, Kamata Yasushi, Katsushima Takafumi, Motoyoshi Hiroki, Sakakibara Ken-ichi, Takeuchi Yukari, Yamaguchi Satoru, Nishimura Koichi  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2019-  88  2019
• グリーンランドにおける人為起源及び自然起源のブラックカーボンの濃度,粒径分布,季節変動の経年変化

  東久美子, 東久美子, 塚川佳美, 近藤豊, DALLMAYR Remi, DALLMAYR Remi, 平林幹啓, 尾形純, 北村享太郎, 川村賢二, 川村賢二, 本山秀明, 本山秀明, 的場澄人, 青木輝夫, 茂木信宏, 大畑祥, 森樹大, 小池真, 小室悠紀, 對馬あかね, 對馬あかね, 永塚尚子, 繁山航, 繁山航, 藤田耕史  日本地球惑星科学連合大会予稿集(Web)  2019-  2019
• フィルンコア試料を用いたグリーンランド南東部高涵養域における過去60年間の気候変動に伴った雪質変化の評価

  安藤卓人, 飯塚芳徳, 柴田麻衣, 的場澄人, 杉山慎, 飯塚芳徳, 柴田麻衣, 的場澄人, 杉山慎, 安達聖, 山口悟, 藤田耕史, 堀彰, 青木輝夫, 藤田秀二  日本地球惑星科学連合大会予稿集(Web)  2019-  ROMBUNNO.ACC26‐03 (WEB ONLY)  2019  [Not refereed][Not invited]
  
• Development of Handheld Integrating Sphere Snow Grain Sizer (HISSGraS)

  Aoki Teruo, Niwano Masashi, Yamaguchi Satoru, Matoba Sumito, Tanikawa Tomonori, Hori Masahiro, Shimada Rigen, Motoyoshi Hiroki, Hachikubo Akihiro  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2018-  117  2018
• SIGMA-Traverse 2018: Dog sledge traverse expedition on the northwestern Greenland ice sheet to perform multipoint snow/ice physical measurements

  Niwano Masashi, Yamaguchi Satoru, Yamasaki Tetsuhide, Aoki Teruo, Hashimoto Akihiro, Tanikawa Tomonori, Hosaka Masahiro, Matoba Sumito  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2018-  109  2018
• International situation of mechanical ice core drilling and borehole logging system

  Motoyama Hideaki, Kawamura Kenji, Furusaki Atsushi, Takata Morimasa, Matoba Sumito, Takahashi Akiyoshi, Tanaka Yoichi, Miyahara Morihiro, Shinbori Kunio, Mori Shoichi  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2017-  266  -266  2017
• Performance of the polar regional climate model NHM-SMAP applied in Greenland Ice Sheet

  Niwano Masashi, Aoki Teruo, Hashimoto Akihiro, Matoba Sumito, Yamaguchi Satoru, Tanikawa Tomonori, Fujita Koji, Tsushima Akane, Iizuka Yoshinori, Shimada Rigen, Hori Masahiro  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2017-  118  2017
• Automatic weather station in polar region: SIGMA and JARE

  Motoyama Hideaki, Aoki Teruo, Niwano Masashi, Matoba Sumito, Sugiyama Shin, Yamaguchi Satoru, Hirasawa Naohiko, Kawamura Kenji, Sannohe Yosuke, Fujiwara Hiroaki, Ono Fumichika, Mori Yoki  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2017-  263  2017
• 複数の力学的ダウンスケーリングに基づくニセコにおける積雪の将来変化

  勝山祐太, 稲津將, 中村一樹, 的場澄人  日本気象学会大会講演予稿集  (112)  2017
• グリーンランド氷床上SIGMA‐Aサイトにおける放射収支観測―近赤外アルベドと気温の関係―

  青木輝夫, 青木輝夫, 庭野匡思, 谷川朋範, 的場澄人, 山口悟, 山崎哲秀, 藤田耕史, 本山秀明, 堀雅裕  日本気象学会大会講演予稿集  (110)  357  2016/09/30  [Not refereed][Not invited]
  
• Snow observations and development of physically based process model at Sapporo

  青木輝夫, 庭野匡思, 的場澄人  低温科学  74-  163  -174  2016/03  [Not refereed][Not invited]
   

  低温科学研究所で行われた積雪断面観測の記録は約50 年に及ぶ世界でもまれに見る貴重なデータセットである．また，その長い歴史の中で，2000 年代以降の断面観測は詳細な放射観測とリンクし，積雪に関係する物理プロセスモデル開発という新たな利用価値が見出されてきた．その背景には，地球温暖化の影響が雪氷圏で顕著に現れるという事実がある．今後，雪氷圏変動を精度良く予測するためには雪氷面における放射収支，熱収支，質量収支などの物理プロセスの更なる理解と精緻なモデル化が必要である．本論文ではこれらの観測結果及びそれに基づいて開発された積雪アルベド物理モデルや積雪変質モデルの検証結果についてレビューし，今後の展望を議論する．Long-term record of snow pit observation conducted by Institute of Low Temperature Science (ILTS) at Sapporofor 50 years is an important and rare data set in the world. Snow pit observations after the 2000 s in the long historywere linked with detailed radiation observations, and both of them were newly utilized for the purpose of physicallybased process modeling on snow. The background for that is related with the fact that effect of global warming isgreater in cryosphere. To predict the future change in cryosphere accurately, further understanding and elaboratemodeling of physical processes including radiation budget, heat budget and mass balance at snow surface are needed.This paper reviews the studies of snow physical/chemical properties and albedos observed at a study plot of ILTS andthe validations of physically based albedo model and snow metamorphism model developed with those data, and thefuture issues are finally discussed.
• Temperature-NIR albedo relationship measured at SIGMA—A on Greenland ice sheet

  Aoki Teruo, Niwano Masashi, Tanikawa Tomonori, Matoba Sumito, Yamaguchi Satoru, Yamasaki Tetsuhide, Fujita Koji, Motoyama Hideaki, Hori Masahiro  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2016-  24  2016
• Initial evaluation of the NHM-SMAP regional climate model in the Greenland ice sheet during 2012

  Niwano Masashi, Aoki Teruo, Hashimoto Akihiro, Tanikawa Tomonori, Hosaka Masahiro, Hori Masahiro, Shimada Rigen, Matoba Sumito, Yamaguchi Satoru, Fujita Koji, Motoyama Hideaki  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2016-  30  2016
• The next deep ice coring in the Dome Fuji region, East Antarctica

  川村賢二, 川村賢二, 川村賢二, 本山秀明, 本山秀明, 東久美子, 東久美子, 藤田秀二, 藤田秀二, 古川晶雄, 古川晶雄, 中澤文男, 中澤文男, 青木周司, 東信彦, 阿部彩子, 阿部彩子, 飯塚芳徳, 植村立, 内田努, 大野浩, 亀田貴雄, 鈴木利孝, 高田守昌, 平林幹啓, 藤田耕史, 福井幸太郎, 堀彰, 堀内一穂, 的場澄人, 宮本淳  雪氷研究大会講演要旨集(Web)  2016-  2016
• 複数の力学的ダウンスケーリングに基づくニセコにおける積雪の将来変化

  勝山祐太, 稲津將, 中村一樹, 的場澄人  細氷(Web)  (62)  2016
• Temperature-NIR albedo relationship measured at SIGMA-A on Greenland ice sheet

  青木輝夫, 青木輝夫, 庭野匡思, 谷川朋範, 的場澄人, 山口悟, 山崎哲秀, 藤田耕史, 本山秀明, 堀雅裕  雪氷研究大会講演要旨集(Web)  2016-  24(J‐STAGE)  2016  [Not refereed][Not invited]
  
• 急激な表面融解イベントが発生した2012年夏期の北西グリーンランドSIGMA‐Aサイトにおける雪面熱収支

  庭野匡思, 青木輝夫, 的場澄人, 山口悟, 谷川朋範, 朽木勝幸, 本山秀明  日本気象学会大会講演予稿集  108-  (108)  140  -140  2015/09/30  [Not refereed][Not invited]
  
• 極地フィールド研究者と犬ぞり北極探検家のフィールドノート

  的場澄人, 山崎哲秀  地理  60-  (9)  47  -51  2015/09  [Not refereed][Not invited]
  
• グリーンランド北西部における雪氷学的研究

  山口悟, 青木輝夫, 的場澄人  月刊地球  37-  59  -71  2015/02  [Not refereed][Not invited]
  
• Evaluation of a physical snowpack model SMAP applied in the Greenland ice sheet- A record surface melt event observed during the 2012 summer -

  Niwano Masashi, Aoki Teruo, Matoba Sumito, Yamaguchi Satoru, Tanikawa Tomonori, Kuchiki Katsuyuki, Motoyama Hideaki  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2015-  72  2015
• Causes of recent darkening of Greenland ice sheet quantified by satellite observations

  Aoki Teruo, Kuchiki Katsuyuki, Niwano Masashi, Hori Masahiro, Tanikawa Tomonori, Shimada Rigen, Matoba Sumito, Yamaguchi Satoru, Stamnes Kunt, Li Wei, Chen Nan  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2015-  70  2015
• Shallow ice core project on south-east dome in Greenland-Drilling report and science trench of the ice core

  Iizuka Yoshinori, Matoba Sumito, Oyabu Ikumi, Yamasaki Tetsuhide, Kadota Moe, Shinbori Kunio, Aoki Teruo, Saito Takeshi, Miyamoto Atsushi, Furukawa Ryoto, Fujita Shuji, Hori Akira, Yamaguchi Satoru, Ohno Hiroshi, Suzuki Toshitaka, Uemura Ryu, Seki Osamu, Motoyama Hideaki  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2015-  190  2015
• Improvement of the Device for Measuring Snow Specific Surface Area

  Hachikubo Akihiro, Yamaguchi Satoru, Hori Masahiro, Tanikawa Tomonori, Sugiura Konosuke, Matoba Sumito, Niwano Masashi, Kuchiki Katsuyuki, Aoki Teruo  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2015-  223  2015
• P160 季節海氷域大気中の海塩粒子 : 海塩組成と海氷からの放出(ポスター・セッション)

  原 圭一郎, 的場 澄人, 山崎 哲秀  大会講演予講集  108-  240  -240  2015
• A303 北西グリーンランドSIGMA-A・Bサイトにおける気象条件の年々変動(気象システムI,一般口頭発表)

  庭野 匡思, 青木 輝夫, 的場 澄人, 山口 悟, 藤田 耕史, 谷川 朋範, 對馬 あかね, 朽木 勝幸, 本山 秀明  大会講演予講集  107-  275  -275  2015
• Evaluation of a physical snowpack model SMAP applied in the Greenland ice sheet - A record surface melt event observed during the 2012 summer -

  庭野匡思, 青木輝夫, 的場澄人, 山口悟, 谷川朋範, 朽木勝幸, 本山秀明  雪氷研究大会講演要旨集(Web)  2015-  72(J‐STAGE)  2015  [Not refereed][Not invited]
  
• 7th International Workshop on Ice Drilling Technology

  Sumito Matoba  雪氷  77-  (1)  91  -93  2015/01  [Not refereed][Not invited]
  
• グリーンランド氷床上積雪面における潜熱フラックス計算方法の再検討

  庭野匡思, 青木輝夫, 的場澄人, 山口悟, 谷川朋範, 朽木勝幸, 本山秀明  日本気象学会大会講演予稿集  106-  (106)  593  -593  2014/09/30  [Not refereed][Not invited]
  
• 積雪粒径測定手法の比較

  青木輝夫, 山口悟, 本吉弘岐, 朽木勝幸, 庭野匡思, 藤田耕史, 的場澄人, 八久保晶弘, 谷川朋範, 堀雅裕, 竹内由香里, 杉浦幸之助  雪氷研究大会講演要旨集  2014-  111  2014/09/05  [Not refereed][Not invited]
  
• 2011年及び2012年に北西グリーンランド氷床上で観測された光吸収性積雪不純物濃度

  AOKI Teruo, MATOBA Sumito, YAMAGUCHI Satoru, TANIKAWA Tomonori, NIWANO Masashi, KUCHIKI Katsuyuki, ADACHI Kouji, UETAKE Jun, MOTOYAMA Hideaki, HORI Masahiro  Bulletin of Glaciological Research  (32)  21  -31  2014/08
• 積雪比表面積の時間変化に及ぼす温度および雪質の影響

  HACHIKUBO Akihiro, YAMAGUCHI Satoru, ARAKAWA Hayato, TANIKAWA Tomonori, HORI Masahiro, SUGIURA Konosuke, MATOBA Sumito, NIWANO Masashi, KUCHIKI Katsuyuki, AOKI Teruo  Bulletin of Glaciological Research  (32)  47  -53  2014/08
• 雪面の熱赤外射出特性の雪質依存性

  HORI Masahiro, AOKI Teruo, TANIKAWA Tomonori, KUCHIKI Katsuyuki, NIWANO Masashi, YAMAGUCHI Satoru, MATOBA Sumito  Bulletin of Glaciological Research  (32)  33  -45  2014/08
• グリーンランド氷床上における光吸収性積雪不純物の積雪表面濃縮過程

  青木輝夫, 朽木勝幸, 庭野匡思, 的場澄人, 對馬あかね, 谷川朋範, 堀雅裕, 山口悟, 本山秀明  日本気象学会大会講演予稿集  105-  (105)  254  -254  2014/04/30  [Not refereed][Not invited]
  
• Seasonal variation of water-soluble ionic species and trace metal concentrations in the atmospheric aerosols over Sapporo

  Minami Hideki, Matoba Sumito, Uematsu Mitsuo  Abstracts of Annual Meeting of the Geochemical Society of Japan  61-  (0)  149  -149  2014  [Not refereed][Not invited]
   

  東海大学札幌キャンパス屋上（札幌市南区）および北海道大学北方生物圏フィールド科学センター天塩研究林庁舎前観測露場(幌延町問寒別）において，粗大粒子(d>2.5μm)と微小粒子(d<2.5μm)に別けて大気中のエアロゾルを採取した（2008年から2012年）。採取したフィルターから主要イオンと微量金属元素を測定し，都市型大気の札幌市と清浄地である天塩研究林のデータを比較しながら考察する。
• 等温変態過程における積雪比表面積(SSA)減少速度の温度依存性

  八久保晶弘, 山口悟, 堀雅裕, 谷川朋範, 杉浦幸之助, 的場澄人, 庭野匡思, 朽木勝幸, 青木輝夫  極域科学シンポジウム講演予稿集(CD-ROM)  5th-  ROMBUNNO.OMP17  2014  [Not refereed][Not invited]
  
• 近赤外域イメージセンサーによる積雪及び氷試料の光学測定

  青木輝夫, 庭野匡思, 山口悟, 本吉弘岐, 朽木勝幸, 的場澄人, 八久保晶弘  雪氷研究大会講演要旨集  2013-  13  2013/09/05  [Not refereed][Not invited]
  
• 雪氷面熱赤外域射出輝度の変動特性と表面雪質の関係

  堀雅裕, 青木輝夫, 谷川朋範, 朽木勝幸, 庭野匡思, 山口悟, 的場澄人, 八久保晶弘, 杉浦幸之助  雪氷研究大会講演要旨集  2013-  16  2013/09/05  [Not refereed][Not invited]
  
• 積雪の波長別双方向反射率と偏光度の測定

  谷川朋範, 青木輝夫, 堀雅裕, 八久保晶弘, 杉浦幸之助, 的場澄人, 山口悟, 朽木勝幸, 庭野匡思  雪氷研究大会講演要旨集  2013-  18  2013/09/05  [Not refereed][Not invited]
  
• lce caps, calving glaciers and ice sheet margins on the western coast of Greenland

  杉山慎, 榊原大貴, 松野智, 的場澄人, 山口悟  雪氷 雪氷写真館  75-  (4)  i  -ii  2013/07  [Not refereed][Not invited]
  
• 2012年夏期の北西グリーンランドSIGMA‐Aにおける積雪シミュレーション

  庭野匡思, 青木輝夫, 的場澄人, 山口悟, 谷川朋範, 本山秀明, 朽木勝幸, 山崎哲秀  日本気象学会大会講演予稿集  103-  (103)  331  -331  2013/04/30  [Not refereed][Not invited]
  
• D373 積雪アルベド物理モデルの再検証(大気放射,口頭発表)

  青木 輝夫, 朽木 勝幸, 庭野 匡思, 的場 澄人, 兒玉 裕二, 森 淳子  大会講演予講集  104-  593  -593  2013
• グリーンランド氷床北西部SIGMA‐Aサイトにおける過去36年間の年間質量収支の復元

  的場澄人, 山口悟, 山崎哲秀, 青木輝夫, 庭野匡思, 谷川朋範, 本山秀明, 杉山慎  極域科学シンポジウム講演予稿集(CD-ROM)  4th-  ROMBUNNO.IA,MATOBASUMITO,1  2013  [Not refereed][Not invited]
  
• SIGMAプロジェクトによる2012年グリーンランド氷床観測報告

  青木輝夫, 的場澄人, 山口悟, 谷川朋範, 庭野匡思, 山崎哲秀, 朽木勝幸, 本山秀明, 堀雅裕  雪氷研究大会講演要旨集  2012-  93  -112  2012/09/10  [Not refereed][Not invited]
  
• 雪氷化学分科会2011年「雪合宿」報告

  中村 一樹, 的場 澄人  雪氷 : 日本雪氷協會雜誌  73-  (5)  362  -363  2011/09/15
• Winter school on snow pit study and snow chemistry

  MATOBA Sumito  雪氷 : 日本雪氷協會雜誌  73-  (5)  ii  2011/09/15
• 氷河を掘って過去の地球を知る

  的場 澄人, マトバ スミト, MATOBA Sumito  Field+ : フィールドプラス : 世界を感応する雑誌 / 東京外国語大学アジア・アフリカ言語文化研究所 [編]  (6)  16  -17  2011/07/08
• Seasonal variation of trace metal concentrations in the atmospheric aerosols over Hokkaido

  Minami Hideki, Fujimoto Ryota, Minami Haruka, Matoba Sumito, Uematsu Mitsuo  Abstracts of Annual Meeting of the Geochemical Society of Japan  58-  (0)  39  -39  2011  [Not refereed][Not invited]
   

  北海道の大気エアロゾルは，道内で放出された化学物質だけでなく，大陸や海洋から飛来した化学物質も含んでおり，北海道は大陸から北太平洋やオホーツク海への物質輸送の通過点としても重要な場所である。北海道において年間を通じて大気エアロゾルのモニタリングを行うことは，極東大気の南下，大陸からの黄砂や人為起源物質の飛来など，世界の気候変動に影響を及ぼす現象を季節的に議論できる点にある。本研究は北海道において環境の異なる2つの観測点で，2008年～2010年に採取した大気エアロゾル中の微量金属元素の経年および季節変動について考察する。
• ドームふじ深層掘削孔検層観測と氷床底面状態

  本山秀明, 本山秀明, 新堀邦夫, 倉元隆之, 飯塚芳徳, 三宅隆之, 平林幹啓, 的場澄人  雪氷研究大会講演要旨集  2011-  2011
• ドームふじ深層掘削孔検層観測と氷床底面状態について

  本山秀明, 本山秀明, 新堀邦夫, 倉元隆之, 飯塚芳徳, 三宅隆之, 平林幹啓, 的場澄人  極域科学・宙空圏・気水圏・生物・地学シンポジウム講演予稿集(CD-ROM)  2011-  2011
• D156 鉱物質ダストの湿性・乾性沈着量の分布(エーロゾル,一般口頭発表)

  長田 和雄, 三上 正男, 的場 澄人, 青木 一真, 篠田 雅人, 黒崎 泰典, 林 政彦, 清水 厚, 田中 泰宙, 浦 幸帆, 香川 雅子, 植松 光夫  大会講演予講集  100-  300  -300  2011
• 大気ダストから降水中に溶出する鉄濃度-アイスコアと積雪試料を用いた大気ダストの溶解度試験-

  佐々木央岳, 的場澄人, 中村一樹, 佐藤和秀, 白岩孝行  雪氷研究大会講演要旨集  2011-  2011
• 黄砂から降水中に溶出する鉄濃度-積雪を用いた黄砂の溶解度試験-

  的場澄人, 中村一樹, 佐藤和秀  雪氷研究大会講演要旨集  2010-  2010
• Ice flow speed and ice thickness survey at Aurora Peak, Alaska, in 2008

  Fukuda, T, S. Sugiyama, T. Shiraiwa, S. Matoba  Glaciology in Hokkaido  28-  69  -72  2009  [Not refereed][Not invited]
  
• B207 北部北太平洋域の過去30年のダスト変動 : 2001年4月の大規模黄砂の降下量は大きい(エアロゾル)

  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
• 雪氷化学分科会2007年「雪合宿」報告

  的場 澄人  雪氷  69-  (4)  555  -556  2007/07/15
• 子ども達の雪氷防災意識向上を継続的に支える試み

  中村一樹, 三好真紀, 久保田敬二, 石本敬志, 的場澄人, 金森晶作, 樋口和生  日本雪氷学会全国大会講演予稿集  2007-  2007
• 子ども達の雪氷防災意識向上を継続的に支える試み

  中村一樹, 三好真紀, 久保田敬二, 石本敬志, 的場澄人, 金森晶作, 樋口和生  寒地技術論文・報告集  23-  2007
• ワークショップ"Prospects and Problems on Ice Cores Drilled at High Mountains"報告

  白岩 孝行, 的場 澄人  雪氷  68-  (4)  315  -317  2006/07/15
• Secular variation of Kosa event extracted from SPM variations

  Matoba Sumito, Hayakari Susumu, Nishikawa Masataka, Mori Ikuko  大気環境学会年会講演要旨集  (44)  570  -570  2003
• 冬季北極大気中のエアロゾル粒子の組成

  原 圭一郎, 長田 和雄, 林 政彦, 松永 捷司, 岩坂 泰信, 白石 浩一, 的場 澄人, 古谷 圭一  大会講演予講集  70-  294  -294  1996/11/06

Books etc

• 「女も男もフィールドへ」（百万人のフィールドワーカーシリーズ12）

  椎野若菜, 的場澄人 (Joint editor)
  古今書院 2017/04 224
• 低温科学便覧

  的場 澄人 (Joint work８章8.5環オホーツク地域の山岳氷河)
  丸善出版 2016
• アイスランド・グリーンランド・北極を知るための65章

  的場 澄人 (Joint work「グリーンランドの都市、カナック—グリーンランド人の心のふるさと」、「世界遺産①・イルリサット・アイスフィヨルド」、「地球温暖化とグリーンランド氷床」)
  明石書店 2016 441
• 雪と氷の疑問60（みんなが知りたいシリーズ２）

  的場 澄人 (Joint workグリーンランドはどんなところ？、フロストフラワーとは何ですか？)
  2016
• フィールドに入る（100万人のフィールドワーカーズシリーズ１）

  的場 澄人 (Joint work５．のこのこと犬ソリにのって—北極探検家と行くフィールドワーク)
  古今書院 2014/05
• 積雪観測ガイドブック

  的場 澄人 (Joint work化学分析のための積雪試料採取)
  朝倉書店 2010
• なぞの宝庫・南極大陸

  技術評論社 2008
• 身近な気象・気候調査の基礎

  古今書院 2000

Presentations

• 寒冷地対応型小型ポータブル PM2.5測定装置の開発 -冬季札幌観測,夏季アラスカ森林火災事例,函館黄 砂事例の紹介-  [Not invited]

  安成哲平, 若林成人, 松見豊, 的場澄人

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• グリーンランド・カナック氷帽上 SIGMA-B サイトで観測された雲の有無による表面熱収支の違い  [Not invited]

  西村基志, 青木輝夫, 庭野匡思, 的場澄人, 谷川朋範, 山口悟, 山崎哲秀

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• グリーンランド南東ドームにおけるアイスコア掘削と気象・雪氷観測  [Not invited]

  飯塚芳徳, 的場澄人, 箕輪昌紘, 山崎哲秀, 川上薫, 角五綾子, 宮原盛厚, 藤田耕史, 橋本明弘, 庭野匡思, 谷川朋範, 青木輝夫

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• 札幌で 2021 年 2 月に発生した斑点濡れ雪の氷薄片観察  [Not invited]

  波多俊太郎, 日下稜, 原田康浩, 庭野匡思, 的場澄人

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• 2021 年 2 月にグリーンランドシオラパルクで生じた海氷流出-海氷の脆弱性が将来の地域住民の生活に 与える影響-  [Not invited]

  的場澄人, 山崎哲秀, 青木輝夫

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• 光吸収性不純物粒子を介した大気-積雪相互作用に関する研究の新展開  [Not invited]

  庭野匡思, 梶野瑞王, 梶川友貴, 青木輝夫, 兒玉 裕二, 谷川朋範, 的場澄人

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• ネパール・ヒマラヤ, トランバウ氷河アイスコアの水安定同位体分析  [Not invited]

  川上薫, 飯塚芳徳, 的場澄人, 青木輝夫, 杉山慎, 安藤卓人

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• 高時間分解能アイスコアによる近年の北大西洋植物プランクトンブルームの長期化の解明  [Not invited]

  黒﨑豊, 的場澄人, 飯塚芳徳, 藤田耕史, 島田利元

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• ネパール・ヒマラヤ, トランバウ氷河アイスコアの水安定同位体分析  [Not invited]

  江刺和音, 對馬あかね, 植村立, 飯塚芳徳, 的場澄人, 藤田耕史

  雪氷研究大会（2021・千葉ーオンライン）  2021/09
• グリーンランドで掘削されたアイスコア中の過去 100 年間の鉱物組成変動  [Not invited]

  永塚尚子, 東久美子, 對馬あかね, 藤田耕史, 的場澄人, 大沼友貴彦, Remi Dallmayr, 門田萌, 平林幹啓, 尾形純, 塚川佳美, 北村享太郎, 箕輪昌紘, 小室悠紀, 本山秀明, 青木輝夫, 中澤文男, Trevor James Popp, Dorthe Dahl-Jensen

  雪氷研究大会（2021・千葉−オンライン）  2021/09
• The version upgrade of the GCOM-C/SGLI Cryosphere products

  Rigen Shimada, Masahiro Hori, Teruo Aoki, Tomonori Tanikawa, Sumito Matoba, Masashi Niwano, Knut Stamnes, Wei Li, Nan Chen

  The 11th Symposium on Polar Science  2020/12
• Continuous flow analysis of iron oxide in a Greenland ice core using a modified single-particle soot photometer

  Goto-Azuma, K, thers

  The 11th Symposium on Polar Science  2020/12
• Analysis of solid microparticles and metal components contained in snow at EGRIP, Greenland

  Komuro, Y, thers

  The 11th Symposium on Polar Science  2020/12
• ArCS II Cryosphere research-3 "Water and material circulations between snow-and-ice and atmosphere in seasonal sea ice regions and their impact on environment in the Arctic

  Sumito Matoba, Yoshinori Iizuka, Yuzo Miyazaki, Toshitaka Suzuki, Shohei Hattori, Ryu Uemura, Keiichiro Hara, Naga Oshima, Tetsuhide Yamasaki, Teruo Aok

  The 11th Symposium on Polar Science  2020/12
• Temporal and spatial variabilities in recent surface mass balance at EGRIP, Greenland

  Yuki Komuro, Fumio Nakazawa, Naoko Nagatsuka, Motohiro Hirabayashi, Wataru Shigeyama, Sumito Matoba, Tomoyuki Homma, Kumiko Goto- Azuma

  The 11th Symposium on Polar Science  2020/12
• The relation between sea ice stratigraphy and particle concentration in an Alaskan coastal lagoon

  Masato Ito, Andrew R. Mahoney, Chris M. Polashenski, Takenobu Toyota, Sumito Matoba, Takashi Kikuch

  The Eleventh Symposium on Polar Science  2020/12
• グリーンランド・カナック氷帽上SIGMA-Bにおける気象条件の経年変動

  西村基志, 青木輝夫, 庭野匡思, 的場澄人, 谷川朋範, 山口悟, 山崎 哲秀

  雪氷研究大会（2020・オンライン）  2020/11
• ArCS II 雪氷サブ課題3「季節海氷域における雪氷-大気間の物質・水循環解明とその気候への影響評 価」の紹介

  的場澄人, 飯塚芳徳, 宮﨑雄三, 鈴木利孝, 服部祥平, 植村立, 原圭一郎, 大島長, 山崎哲秀, 青木輝夫

  雪氷研究大会（2020・オンライン）  2020/11
• グリーンランドEGRIPのピット試料に含まれる固体微粒子および金属成分の解析

  小室悠紀 ほか

  雪氷研究大会（2020・オンライン）  2020/11
• 積雪と海氷の波長別偏光特性

  谷川朋範, 青木輝夫, 石元裕史, 増田一彦, 庭野匡思, 堀雅裕, 八久保 晶弘, 的場澄人, 杉浦幸之助, 島田利元, 大河原望

  雪氷研究大会（2019・オンライン）  2020/11
• グリーンランド氷床上における衛星抽出積雪物理量とアルベドの関係

  青木輝夫, 島田利元, 堀雅裕, 庭野匡思, 谷川朋範, 的場澄人

  雪氷研究大会（2020・オンライン）  2020/11
• グリーンランド南東ドームアイスコアによる 1970 年代の硫酸エアロゾル組成とフラックス

  飯塚芳徳, 植村立, 松井仁志, 大島長, 的場澄人

  雪氷研究大会（2020・オンライン）  2020/11
• グリーンランド北西部 SIGMA-A アイスコアの融解再凍結層に含まれる不純物の解析

  川上薫, 飯塚芳徳, 的場澄人, 青木輝夫, 杉山慎, 安藤卓人

  雪氷研究大会（2020・オンライン）  2020/11
• Atmospheric sea-salt and halogen chemistry in the Antarctic region

  Keiichiro Hara, Kazuo Osada, Masanori Yabuki, Sumito Matoba, Fumio Nakazawa, Shuji Fujita, Motohiro Hirabayashi, Takashi Yamanouchi

  The Tenth Symposium on Polar Science  2019/12
• Variations in mineralogical composition of dust present in the Greenland SIGMA-D ice core and EGRIP snow pit over the past 100 years

  Naoko Nagatsuka, Kumiko Goto-Azuma, Akane Tsushima, Hideaki Motoyama, Sumito Matoba, Koji Fujita, Tetsuhide Yamasaki, Yukihiko Onuma, Yuki Komuro, Masahiro Minowa, Teruo Aoki, Motohiro Hirabayashi, Fumio Nakazawa, Dorthe Dahl-Jensen

  The tenth symposium on Polar Science  2019/12
• Satellite-derived snow grain size over the Greenland Ice Sheet and its relationships with climate indices

  Teruo Aoki, Rigen Shimada, Masahiro Hori, Masashi Niwano, Tomonori Tanikawa, Hiroshi Ishimoto, Sumito Matoba, Iizuka Yoshinori, Koji Fujita

  The Tenth Symposium on Polar Science  2019/12
• Antarctic Study on Tropospheric Aerosol and Snow Chemistry (ASTASC) in JARE Phase X

  Keiichiro Hara, Masanori Yabuki, Hiroshi Kobayashi, Sumito Matoba, Yoshinori Iizuka, Norimichi Takenaka, Shohei Hattori, Hisahiro Takashima, Fumihisa Kobayashi, Sakiko Ishino, Naohiko Hirasawa, Masahiko Hayashi

  The Tenth Symposium on Polar Science  2019/12
• 2007-2018 年冬季の札幌の表面積雪中の EC、OC および dust 濃度の変動傾向

  對馬あかね, 庭野匡思, 青木輝夫, 谷川 朋範, 的場澄人, 大河原望

  雪氷研究大会（2019・山形）  2019/09
• 過去の気候変動復元を目的とした地下氷のイオン濃度解析

  飯塚芳徳, 宮本千尋, 的場澄人, 岩花剛, 堀内一穂, 高橋嘉夫, 漢那直也, 鈴木光次, 大野浩

  雪氷研究大会（2019・山形）  2019/09
• グリーンランド氷床アイスコアおよび積雪ピットサンプル中の過去100年間の鉱物組成変動の解明

  永塚尚子, 東久美子, 對馬あかね, 本山秀明, 的場澄人, 藤田耕史, 山崎哲秀, 大沼友貴彦, 小室悠紀, 箕輪昌紘, 青木輝夫, 平林幹啓, 中澤文男, Dorthe Dahl-Jensen

  雪氷研究大会（2019・山形）  2019/09
• アイスメモリープロジェクトに対する日本雪氷コミュニティの貢献の可能性―これまでの経緯とこれ からの課題と展望―

  服部祥平, 藤田耕史, 竹内望, 飯塚芳徳, 的場澄人

  雪氷研究大会（2019・山形）  2019/09
• 積雪の国際分類の日本語版作成について -積雪分類ワーキンググループの活動-

  尾関俊浩, 八久保晶弘, 原田裕介, 鎌田慈, 勝島隆史, 的場澄人, 本吉弘岐, 榊原健一, 竹内由香里, 山口悟, 西村浩一

  雪氷研究大会（2019・山形）  2019/09
• グリーンランド北西部における過去 350 年間のブラックカーボン及びダストの季節変化及び経年変化

  東久美子他

  雪氷研究大会（2019・山形）  2019/09
• グリーンランド北西部 SIGMA-A アイスコアによる海氷変動の復元

  黒﨑豊, 的場澄人, 飯塚芳徳, 庭野匡思, 谷川朋範, 安藤卓人, 青木輝夫

  雪氷研究大会（2019・山形）  2019/09
• グリーランド北西部 SIGMA-A アイスコアの融解再凍結層に含まれる微粒子の観察と組成分析

  川上薫, 飯塚芳徳, 的場澄人, 青木輝夫, 杉山慎, 安藤卓人

  雪氷研究大会（2019・山形）  2019/09
• フィルンコア試料を用いたグリーンランド南東部高涵養域における過去60年間の気候変動に伴った雪質変化の評価  [Not invited]

  安藤卓人, 飯塚芳徳, 柴田麻衣, 的場澄人, 杉山慎, 飯塚芳徳, 柴田麻衣, 的場澄人, 杉山慎, 安達聖, 山口悟, 藤田耕史, 堀彰, 青木輝夫, 藤田秀二

  日本地球惑星科学連合大会予稿集(Web)  2019
• 光吸収性エアロゾルの監視と大気・雪氷系の放射収支への影響評価  [Not invited]

  保坂征宏, 谷川朋範, 庭野匡思, 足立光司, 石元裕史, 大島長, 梶野瑞王, 的場澄人

  日本気象学会大会講演予稿集  2018/09
• 積雪内部における鉛直高解像度不純物移動計算の試み  [Not invited]

  庭野匡思, 青木輝夫, 青木輝夫, 梶野瑞王, 梶野瑞王, 伊藤一輝, 橋本明弘, 兒玉裕二, 的場澄人, 谷川朋範, 山口悟

  日本気象学会大会講演予稿集  2018/04
• Development of Handheld Integrating Sphere Snow Grain Sizer (HISSGraS)  [Not invited]

  青木輝夫, 青木輝夫, 庭野匡思, 山口悟, 的場澄人, 谷川朋範, 堀雅裕, 島田利元, 本吉弘岐, 八久保晶弘

  雪氷研究大会講演要旨集(Web)  2018
• 北西グリーンランド氷床上SIGMA‐Aサイトにおける雪面熱収支  [Not invited]

  廣瀬聡, 青木輝夫, 青木輝夫, 庭野匡思, 的場澄人, 谷川朋範, 山口悟, 山崎哲秀

  日本地球惑星科学連合大会予稿集(Web)  2018
• SIGMA-Traverse 2018: Dog sledge traverse expedition on the northwestern Greenland ice sheet to perform multipoint snow/ice physical measurements  [Not invited]

  庭野匡思, 山口悟, 山崎哲秀, 青木輝夫, 青木輝夫, 橋本明弘, 谷川朋範, 保坂征宏, 的場澄人

  雪氷研究大会講演要旨集(Web)  2018
• グリーンランド SIGMA-A アイスコア試料の近赤外光反射率測定  [Not invited]

  安藤卓人, 飯塚芳徳, 的場澄人, 杉山慎, 柴田麻衣, 黒崎豊, 堀彰, 八久保晶弘, 藤田秀二, 青木輝夫

  雪氷研究大会講演要旨集(Web)  2018
• グリーンランド氷床における極域気候モデルNHM‐SMAPの2m気温再現精度  [Not invited]

  庭野匡思, 青木輝夫, 青木輝夫, 橋本明弘, 的場澄人, 山口悟, 谷川朋範, 藤田耕史, 對馬あかね, 飯塚芳徳, 島田利元, 堀雅裕

  日本気象学会大会講演予稿集  2017/09
• 「北極域における積雪汚染及び雪氷微生物が急激な温暖化に及ぼす影響評価に関する研究（SIGMAプロジェクト）」によるグリーンランド観測  [Not invited]

  青木輝夫, 庭野匡思, 谷川朋範, 橋本明弘, 的場澄人, 杉山慎, 竹内望, 本山秀明, 永塚尚子, 植竹淳, 堀雅裕, 島田利元, 山口悟, 藤田耕史, 山崎哲秀

  極地  2017
• Performance of the polar regional climate model NHM-SMAP applied in Greenland Ice Sheet  [Not invited]

  庭野匡思, 青木輝夫, 青木輝夫, 橋本明弘, 的場澄人, 山口悟, 谷川朋範, 藤田耕史, 對馬あかね, 飯塚芳徳, 島田利元, 堀雅裕

  雪氷研究大会講演要旨集(Web)  2017
• Automatic weather station in polar region: SIGMA and JARE  [Not invited]

  本山秀明, 本山秀明, 青木輝夫, 庭野匡思, 的場澄人, 杉山慎, 山口悟, 平沢尚彦, 平沢尚彦, 川村賢二, 川村賢二, 三戸洋介, 藤原宏章, 小野文睦, 森陽樹

  雪氷研究大会講演要旨集(Web)  2017
• 極域領域気候モデルNHM‐SMAPの初期評価結果  [Not invited]

  庭野匡思, 青木輝夫, 青木輝夫, 橋本明弘, 谷川朋範, 保坂征宏, 堀雅裕, 的場澄人, 山口悟, 藤田耕史, 本山秀明

  日本気象学会大会講演予稿集  2016/09
• グリーンランド氷床上SIGMA‐Aサイトにおける放射収支観測―近赤外アルベドと気温の関係―  [Not invited]

  青木輝夫, 青木輝夫, 庭野匡思, 谷川朋範, 的場澄人, 山口悟, 山崎哲秀, 藤田耕史, 本山秀明, 堀雅裕

  日本気象学会大会講演予稿集  2016/09
• Darkening of Greenland ice sheet and satellite-derived snow parameters  [Not invited]

  T. Aoki

  6th Symposium on Polar Science  2015/12
• Sea-salt fractionation in Arctic during winter  [Not invited]

  K. Hara, S. Matoba, T. Yamasaki

  6th Symposium on Polar Science  2015/12
• Glaciological Investigations in Severnaya Zemlya in 1995-1996  [Not invited]

  S. Takahashi, S. Matoba, A. Takahashi, O. Watanabe, L. Savatyugin

  6th Symposium on Polar Science  2015/12
• Ice core drilling on the South-East Dome in Greenland Ice Sheet  [Not invited]

  Y. Iizuka, S. Matoba, T. Yamasaki, I. Oyabu, M. Kadota

  The 6th Symposium on Polar Science  2015/12
• Chemical concentrations and fractionations during formation of frost flower on sea ice  [Not invited]

  S. Matoba, K. Hara, T. Yamasaki, M. Hirabayashi

  The 6th Symposium on Polar Science  2015/12
• Reconstruction of climate during the past 157 years by analyzing an ice core obtained from Northwestern Greenland Ice Sheet (SIGMA-D)  [Not invited]

  Moe Kadota, Sumito Matoba, Hideaki Motoyama, Koji Fujita, Tetsuhide Yamasaki, Yukihiko Onuma, Masahiro Minowa, Yuki Komuro, Teruo Aoki

  The 6th Symposium on Polar Science  2015/12
• Advocates of establishment of observation bases in Greenland Arctic and Canada Arctic region -For promotion of Japanese Arctic Research -  [Not invited]

  Tetsuhide Yamasaki, AVANGNAQ, Masayuki Kobayashi (APEROS, Sumito Matoba, ILT

  Symposium on Polar Science  2014/12
• Temperature effect on rate of decrease in specific surface area (SSA) of snow under isothermal metamorphysm  [Not invited]

  Akihiro Hachikubo (KIT, Satoru Yamaguchi (NIED, Masahiro Hori (JAXA, Tomonori Tanikawa (JAXA, Konosuke Sugiura, niv. Toyama, Sumito Matoba (ILTS, Masashi Niwano (MRI, Katsuyuki Kuchiki (MRI, Teruo Aoki (MRI

  Symposium on Polar Science  2014/12
• Chemical compositions of frost flower at Siorapaluk in northwestern Greenland  [Not invited]

  Sumito Matoba (ILTS, Hokkaido Univ, Keiichiro Hara, Fukuoka Univ, Tetsuhide Yamasaki, AVANGNAQ

  Symposium on Polar Science  2014/12
• Aerosol measurements at Siorapaluk, Greenland  [Not invited]

  K. Hara, S. Matoba, T. Yamasaki, Fukuoka Univ, Hokkaido Univ. ILTS, AVANGNAQ

  Symposium on Polar Science  2014/12
• Preliminary results of an ice core obtained from Northwestern Greenland Ice Sheet (SIGMA-D)  [Not invited]

  Sumito Matoba (ILTS, Hokkairo Uni, Hideaki Motoyama (NIPR, Koji Fujita, Nagoya Uni, Tetsuhide Yamasaki, AVANGNAQ, Yukihiko Onuma, Chiba Uni, Masahiro Minowa, Hokkaido Uni, Yuki Komuro, Yamagata Univ, Moe Kadota, Hokkaido Uni, Satoru Yamaguchi (NIED, Teruo Aoki (MR

  Symposium on Polar Science  2014/12
• A development of snowfall estimation model for Antarctica *part1-  [Not invited]

  Kazue Suzuki (ISM, Hideaki Motoyama (NIPR, SOKENDAI, Naohiko Hirasawa (NIPR, SOKENDAI, Takashi Yamaonuchi (NIPR, SOKENDAI, Hiroyuki Enomoto (NIPR, SOKENDAI, Takeshi Tamura (NIPR, SOKENDAI, Yoshinori Iizuka (ILTS, Sumito Matoba (ILTS, Tomoyuki Higuchi (ISM, SOKENDAI

  Symposium on Polar Science  2014/12
• Recent technologies of intermediate depth drill and borehole measurement  [Invited]

  Hideaki Motoyama, National, Institute of, Polar Research, Atsushi Furusaki, Asahikawa National, College of Technology, Akiyoshi Takahashi, Geo Tecs Co. Lt, Yoichi Tanaka, eosystems Inc, Morihiro Miyahara, Anori Inc, Morimasa Takata, Nagaoka, University of Technology, Takanobu Sawagaki, Faculty of, Env. Earth, Science Hokkaido University, Sumito Matoba, itute of Low, Temperature Science, Hokkaido University, Shin Sugiyama, stitute of Low, Temperature Science, Hokkaido University, Kunio Shinbori, Institute of Low, Temperature Science, Hokkaido University, Shoichi Mori, stitute of Low, Temperature Science, Hokkaido Univer

  Symposium on Polar Science  2014/12
• 日本雪氷学会による日本の雪と氷 100 選 web 参加型の企画の試み  [Not invited]

  山口悟, 的場澄人, 角川咲江, 原田鉱一郎, 堤拓弥, 宮崎伸夫, 本雪氷学会広報委員会, 澤柿教伸, 日, 本雪氷学会電子情報委

  雪氷研究大会（2014・八戸）  2014/09
• グリーンランド北西部でのフロストフラワーの観測 化学成分の濃縮と成分分別  [Not invited]

  的場澄人, 道大学低温科学研究所, 原圭一郎, 山崎哲秀(アバンナット

  雪氷研究大会（2014・八戸）  2014/09
• 融雪期における雪面上への模擬降雨散水実験 − 積雪底面流出水の水同位体比とイオン濃度の時間変化 −  [Not invited]

  石井吉之, 中坪俊一, 森章一, 的場澄人, 海道大学低温科学研

  雪氷研究大会（2014・八戸）  2014/09
• フィンランド積雪縦断観測-2013  [Not invited]

  佐藤篤司, 防災科学技術研究所雪氷防災研究センター, 對馬あかね, 北海道大学大学院環境科学院, 大宮 哲, 的場澄人, 低温科学

  雪氷研究大会（2014・八戸）  2014/09
• 最近の浅層・中層掘削技術と検層について  [Not invited]

  本山秀明, 古崎睦, 旭川工業高等専門学校, 高橋昭好, 地球工学研究, 田中洋 一, ジオシステムズ, 宮原盛厚, 株)アノウィ, 新堀邦夫, 的場澄人, 杉山慎, 森章一, 低温科学研究所, 澤柿教伸, 北海道大学大学院地球環境科学研究院, 高田守昌

  雪氷研究大会（2014・八戸）  2014/09
• 融雪初期における積雪比表面積の深度プロファイルの経時変化  [Not invited]

  八久保晶弘, 山口悟, 防災科学技術研究所, 堀雅裕, 谷川朋範, 杉浦幸之助, 的場澄人, 学研究所, 庭野匡思, 朽木勝幸, 青木輝夫

  雪氷研究大会（2014・八戸）  2014/09
• 札幌における光吸収性積雪不純物濃度の長期変動  [Not invited]

  朽木勝幸, 青木輝夫, 庭野匡思, 的場澄人, 低温科学研究所, 兒玉裕二

  雪氷研究大会（2014・八戸）  2014/09
• 積雪粒径測定手法の比較  [Not invited]

  青木輝夫, 山口悟, 本吉弘岐, 朽木勝幸, 庭野匡思, 藤田耕史, 的場澄人, 八久保晶弘, 谷川朋範, 堀雅裕, 宇宙航空研究開発機構, 竹内由香里, 杉浦幸之助

  雪氷研究大会（2014・八戸）  2014/09
• グリーンランド北西氷床のアイスコア掘削について - SIGMA-D 経過報告 -  [Not invited]

  本山秀明, 的場澄人, 大学低温科学研究所, 藤田耕史, 名古屋大学大学院環境学, 研究科, 山崎哲秀(アバンナット, 大沼友貴彦, 箕輪昌紘, 道大学低温, 科学研究所, 小室悠紀, 山形大学大学院理工学研究科, 山口悟(防災科学技術研究所雪氷防災研究センタ, 青木輝夫

  雪氷研究大会（2014・八戸）  2014/09
• アイスコアを用いたアラスカの近年の気候変動復元  [Not invited]

  對馬あかね, 北海道大学大学院環境科学院, 的場澄人, 白岩孝行, 海道大学低温科学研

  雪氷研究大会（2014・八戸）  2014/09
• グリーンランド氷床上積雪面における潜熱フラックス計算方法の再検討  [Not invited]

  庭野匡思, 青木輝夫, 的場澄人, 山口悟, 谷川朋範, 朽木勝幸, 本山秀明

  2014年秋季気象学会  2014/09
• Impacts of new snow grain size setup on the performance of a physical snowpack model SMAP  [Not invited]

  Masashi Niwano, Teruo Aoki, Katsuyuki Kuchiki, Sumito Matoba, Yuji Kodama

  Japan Geoscience Union Meeting 2014  2014/05
• Alpine ice core drilling at the northern North Pacific region  [Not invited]

  Matoba, S, Shimbori, K, Shiraiwa, T

  7th International Workshop on Ice Drilling Technology  2013/09
• 浅層掘削記録、深層掘削記録の解析と将来の浅層・中層掘削計画  [Not invited]

  本山秀明, 古崎睦, 旭川工業高等専門学校, 高橋昭好, 地球工学研, 田中洋一, ジオシステムズ, 宮原盛厚, アノウィ, 新堀邦夫, 的場澄人, 杉山慎, 北海道, 大学低温科学研究所, 高田守昌

  雪氷研究大会（2013・北見）  2013/09
• 積雪温度勾配下における水蒸気移動とそれに伴う水安定同位体変化  [Not invited]

  保科優, 山口悟(防災科学技術研究所雪氷防災センター, 藤田耕史, 佐 藤篤司, 術研究所雪氷防災センター, 的場澄人, 本山秀明

  雪氷研究大会（2013・北見）  2013/09
• グリーンランド氷床北西部 SIGMA-A サイトにおける過去 36 年間の年間質量収支の復元  [Not invited]

  的場澄人, 北海道大学低温科学研究所, 山口悟(防災科学技術研究所雪氷防災研究センター, 山崎 哲秀, 地球工学研, 青木輝夫, 庭野匡思, 谷川朋範, 本山秀明, 杉山慎(北海道大学低温科学研究

  雪氷研究大会（2013・北見）  2013/09
• グリーンランド氷床上積雪の通年数値シミュレーション  [Not invited]

  庭野匡思, 青木輝夫, 的場澄人, 学低温科学研究所, 山口悟(防災科学技術, 研究所雪氷防災研究センター, 谷川朋範, 朽木勝幸, 橋本明弘, 保坂征宏

  雪氷研究大会（2013・北見）  2013/09
• 積雪の波長別双方向反射率と偏光度の測定  [Not invited]

  谷川朋範, 青木輝夫, 堀雅裕, 宇宙航空研究開発機構, 八久 保晶弘, 杉浦幸之助, 的場澄人, 山口悟, 防災科学, 技術研究所, 朽木勝幸, 庭野匡思

  雪氷研究大会（2013・北見）  2013/09
• 雪氷面熱赤外域射出輝度の変動特性と表面雪質の関係  [Not invited]

  堀雅裕, 宇宙航空研究開発機構, 青木輝夫, 谷川朋範, 朽木 勝幸, 庭野匡思, 山口悟(防災科学技術研究所雪氷防災研究センター, 的場澄人, 北海, 道大学低温科学研, 八久保晶弘, 杉浦幸之助

  雪氷研究大会（2013・北見）  2013/09
• 近赤外域イメージセンサーによる積雪及び氷試料の光学測定  [Not invited]

  青木輝夫, 庭野匡思, 山口悟, 本吉弘岐, 防災科学技術研究所雪氷防災研究センター, 朽木勝幸, 的場澄人, 八久保晶弘

  雪氷研究大会（2013・北見）  2013/09
• 降雨と融雪が重なって生じる融雪出水(その 3) − 3 ヶ年の模擬降雨散水実験の比較−  [Not invited]

  石井吉之, 中坪俊一, 森章一, 的場澄人, 大学低温科学研究

  雪氷研究大会（2013・北見）  2013/09
• 南極ドームふじでの深層掘削孔の検層観測  [Not invited]

  本山秀明, 古崎睦, 高橋昭好, 田中洋一, 宮原盛厚, 高田守昌, 澤柿教伸, 的場澄人, 杉山慎, 新堀邦夫, 森章一

  雪氷研究大会（2013・北見）  2013/09
• Assessing the extreme surface melt at SIGMA-A, northwestern Greenland during 2012 summer using a physical snowpack model  [Not invited]

  Masashi Niwano, Teruo Aoki, Sumito Matoba, Satoru Yamaguchi, Tomonori Tanikawa, Hideaki Motoyama, Katsuyuki Kuchiki

  Japan Geophysical Union Meeting 2013  2013/05
• Possible effects of snow grain size and snow impurity concentration on the albedo mea- sured at SIGMA-A in Greenland  [Not invited]

  Teruo Aoki, Sumito Matoba, Satoru Yamaguchi, Tomonori Tanikawa, Masashi Niwano, Tetsuhide Yamasaki, Katsuyuki Kuchiki, Hideaki Motoyama, Masahiro Hori

  Japan Geoscience Union Meeting 2013  2013/05
• ICE MASS LOSS IN NORTHWESTERN GREENLAND  [Not invited]

  S.Sugiyama, S.Matoba, S.Yamaguchi, D.Sakakibara, S.Matsuno

  International Symposium on the Arctic Research  2013/01
• THE VARIABILITY MECHANISM OF PRECIPITATION AMOUNT IN CENTRAL ALASKA  [Not invited]

  A.Tsushima, S.Matoba, T.Shiraiwa

  International Symposium on the Arctic Research  2013/01
• THINNING OF AN ICE CAP AT THE COASTAL MARGIN OF NORTHWESTERN GREENLAND  [Not invited]

  S.Matsuno, S.Sugiyama, D.Sakakibara, S.Yamaguchi, S.Matoba, T. Sawagaki

  International Symposium on the Arctic Research  2013/01
• MASS CONCENTRATION OF SNOW IMPURITIES AND SNOW GRAIN SIZE ON NORTHWESTERN GREENLAND ICE SHEET: COMPARISON BETWEEN RETRIEVAL FROM MODIS AND IN-SITU MEASUREMENT  [Not invited]

  K. Kuchiki, T. Aoki, H. Motoyoshi, S. Matoba, S. Yamaguchi, T. Tanikawa, M.Niwano, R.Shimada, T.Yamasaki

  International Symposium on the Arctic Research  2013/01
• NUMERICAL SIMULATION OF SUMMER SNOWMELT AT SITE SIGMA-A NORTHWESTERN GREENLAND DURING 2012 INTENSIVE OBSERVATIONS  [Not invited]

  M. Niwano, T. Aoki, S. Yamaguchi, S. Matoba, T. Tanikawa, T. Yamasaki, K.Kuchiki, H.Motoyama

  International Symposium on the Arctic Research  2013/01
• MEASUREMENT OF SPECIFIC SURFACE AREA OF SNOW COVER IN 188 GREENLAND  [Not invited]

  S.Yamaguchi, S.Matoba, T.Aoki, M.Niwano, T.Tanikawa, T.Yamasaki, A. Hachikubo

  International Symposium on the Arctic Research  2013/01
• MELTING RECORD IN NORTHWESTERN GREENLAND ICE SHEET  [Not invited]

  S. Matoba, S. Yamaguchi, T. Yamasaki, T. Tanigawa, T. Aoki, M. Niwano, H. Motoyama

  International Symposium on the Arctic Research  2013/01
• INTENSIVE OBSERVATIONS OF METEOROLOGICAL AND SNOW-PHYSICAL 186 PARAMETERS AT SITE SIGMA-A IN NORTHWESTERN GREENLAND IN SUMMER 2012  [Not invited]

  T.Aoki, S.Matoba, S.Yamaguchi, T.Tanikawa, W.Niwano, T.Yamasaki, K.Kuchiki, H.Motoyama, M.Hori

  International Symposium on the Arctic Research  2013/01
• Variations of snow impurities and albedo at site SIGMA-A on Greenland ice sheet  [Not invited]

  Teruo Aoki (MRI, Katsuyuki Kuchiki (MRI, Sumito Matoba (ILTS, Satoru Yamaguchi, NIEDO, Tomonori Tanikawa (JAXA, Masashi Niwano (MRI, Tetsuhide Yamasaki, Arctic Explorer, Hideaki Motoyama (NIPR, Masahiro Hori (JA

  Symposium on Polar Science  2012/11
• Recent climatic change of Alaska (1724-2008) record from Aurora Peak ice core, central Alaska  [Not invited]

  Akane Tsushima, Hokkaido Univ.,ILTS, Sumito Matoba (ILTS, Takayuki Shiraiwa (ILT

  Symposium on Polar Science  2012/11
• Relation between annual accumulation reconstructed from ice cores at Alaskan alpine glaciers and Pacific Climate Shift  [Not invited]

  Sumito Matoba (ILTS, Hokkaido Univ, Akane Tsushima (ILTS, Grad. School for, Environ. Sci, Hokkaido Univ, Takayuki Shiraiwa (ILTS, Hokkaido Un

  Symposium on Polar Science  2012/11
• Glaciological observations at Site SIGMA-A on the northwestern Greenland Ice Sheet  [Not invited]

  Sumito Matoba (ILTS, Hokkaido Univ, Satoru Yamaguchi (Snow, Ice Research Center, NIED, Tetsuhide Yamasaki, Geo Tech Ltd, Arctic dog-sledge explorer, Teruo Aoki (MRI, Masashi Niwano (MRI, Tomonori Tanikawa, EORC , JAXA, Hideaki Motoyama (NIPR

  Symposium on Polar Science  2012/11
• Spectral albedos of glacier surfaces covered with glacial microbes in northwestern Greenland  [Not invited]

  青木輝夫, 朽木勝幸, 庭野匡思, 的場澄人, 植竹淳, 本山秀明, 竹内望

  Japan Geoscience Union Meeting  2012
• Variations in pollen grains in an shallow ice core drilled from Fedchanko Glacier in Pamir, Central Asia.  [Not invited]

  宮入匡矢, 竹内望, 藤田耕史, 的場澄人, 岡本祥子, Dylan Bodinton, Eugene Podolskiy, Vlandimir Aizen

  Japan Geoscience Union Meeting  2012
• Variation of precipitation reconstructed from Alaskan alpine ice-core  [Not invited]

  Matoba, S, A. Tsushima, T. Shiraiwa

  Japan Geoscience Union Meeting  2012
• Variations in pollen grains in a shallow ice core drilled from Fechenko Glacier in Pamir, Central Asia  [Not invited]

  宮入匡矢, 竹内望, 藤田耕史, 的場澄人, 岡本祥子

  JSSI and JSSE Joint Conference on Snow and Ice Research  2012
• Study of precise measurement for borehole temperature in glacier and ice sheet  [Not invited]

  本山秀明, 古崎睦, 高橋宏, 高田守昌, 高橋昭好, 宮原盛厚, 的場澄人, 杉山慎, 飯塚芳徳, 新堀邦夫

  JSSI and JSSE Joint Conference on Snow and Ice Research  2012
• Chemical properties of snow cover at the northwestern Greenland Ice Sheet - Report on SIGMA 2011 Greenland expedition-  [Not invited]

  Matoba, S, J. Uetake, T. Aoki

  JSSI and JSSE Joint Conference on Snow and Ice Research  2012
• Field activities on Greenland Ice Sheet, 2012 by SIGMA project  [Not invited]

  青木輝夫, 的場澄人, 山口悟, 谷川朋範, 庭野匡思, 山崎哲秀, 朽木勝幸, 本山秀明, 堀雅裕

  JSSI and JSSE Joint Conference on Snow and Ice Research  2012
• Mass concentration of snow impurities in Sapporo during the 5 winters from 2007 to 2012  [Not invited]

  Kuchiki, K, T. Aoki, M. Niwano, Y. Kodama, S. Matoba

  JSSI and JSSE Joint Conference on Snow and Ice Research  2012
• Snow hydrological study on snowmelt flood during the rain-on-snow event (2) — Rain simulation experiment over the snow surface —  [Not invited]

  石井 吉之, 中坪 俊一, 森 章一, 的場 澄人, 兒玉 裕二

  JSSI and JSSE Joint Conference on Snow and Ice Research  2011
• Stable Isotopes and Chemical Composition of a shallow ice core of the Fedchenko Glacier, Pamirs  [Not invited]

  雨宮 俊, 竹内 望, 藤田 耕史, 的場 澄人, 岡本 祥子, Podolskiy Evgeny, Bodington Dylan, Vladimir Aizen

  JSSI and JSSE Joint Conference on Snow and Ice Research  2011
• Concentration of iron solved from atmospheric dust particle in precipitation ̶ Solubility test of atmospheric iron using ice core and snow cover ̶  [Not invited]

  佐々木 央岳, 的場 澄人, 中村 一樹, 佐藤 和秀, 白岩 孝行

  JSSI and JSSE Joint Conference on Snow and Ice Research  2011
• Long-term variations of chemical signals in the Aurora Peak Ice-core from Alaska  [Not invited]

  Matoba, S, A. Tsushima, H. Sasaki, T. Shiraiwa, K. Yoshikawa

  JSSI and JSSE Joint Conference on Snow and Ice Research  2011
• Borehole measurement of deep ice coring site at Dome Fuji, Antarctica and characteristics of ice sheet near bedrock  [Not invited]

  本山秀明, 新堀邦夫, 倉元隆之, 飯塚芳徳, 三宅隆之, 平林幹啓, 的場澄人

  JSSI and JSSE Joint Conference on Snow and Ice Research  2011
• Field science with a polar explorer  [Not invited]

  Matoba, S, T. Yamasaki

  Japan Geoscience Union Meeting  2011
• Reconstruction of summer temperature by Aurora Peak ice core, Alaska Range  [Not invited]

  岡本祥子, 對馬あかね, 佐々木央岳, 的場澄人, 白岩孝行

  Japan Geoscience Union Meeting  2011
• A 274-year environmental record of from Aurora Peak ice core, Alaska.  [Not invited]

  對馬あかね, 的場澄人, 福田武博, 杉山慎, 吉川謙二, 白岩孝行

  Japan Geoscience Union Meeting  2011
• Characteristics of Isotope and Chemical Composition in the Fedchenko Glacier, Pamirs  [Not invited]

  雨宮俊, 竹内望, 藤田耕史, 的場澄人, 岡本祥子, Podolskiy Evgeny

  Japan Geoscience Union Meeting  2011
• Is the source of iron River Amur or Asian Dust? -Estimation of air-borne Fe flux from ice core  [Invited]

  Matoba, S, H. Sasaki, T. Shiraiwa

  Japan Geoscience Union Meeting  2011
• アラスカ・オーロラピークで掘削されたアイスコア中の化学成分の解析  [Not invited]

  對馬あかね, 的場澄人, 岡本祥子, 佐々木央岳, 福田武博, 杉山慎, 白岩孝行, Daniel Solie, 吉川謙二

  雪氷研究大会（2010・仙台）  2010  仙台  日本雪氷学会
  
• カムチャツカ・イチンスキーアイスコアのdDプロファイルとオホーツク海の海氷面積の変動  [Not invited]

  的場澄人, 對馬あかね, 佐々木央岳, 白岩孝行, Y. D. Muravyev

  雪氷研究大会（2010・仙台）  2010  仙台  日本雪氷学会
  
• 黄砂から降水中に溶出する鉄濃度-積雪を用いた黄砂の溶解度試験-  [Not invited]

  的場澄人, 中村一樹, 佐藤和秀

  雪氷研究大会（2010・仙台）  2010  仙台  日本雪氷学会
  
• パミール・フェドチェンコ氷河2009年アイスコアの掘削調査  [Not invited]

  竹内望, 藤田耕史, 的場澄人, 岡本祥子, E. Podolyskiy, D. Bodington, V. Aizen

  雪氷研究大会（2010・仙台）  2010  仙台  日本雪氷学会
  
• Is atmospheric iron deposition important for primary production? Lesson from Alaskan ice core  [Not invited]

  Sasaki, H, Matoba, S, Shiraiwa, T, Nishioka J, Benson, C. S

  Interntional Glaciological Society, International Symposium on snow, ice and humanity in a changing climate  2010  Sapporo  International Glaciological Sciety
  
• Seasonal variation in chemical species in the ice core drillied at Aurora Peak, Alaska  [Not invited]

  Tsushima A, Matoba S, Okamoto S, Sasaki H, Fukuda T, Sugiyama S. Solie D, Yoshikawa K

  Interntional Glaciological Society, International Symposium on snow, ice and humanity in a changing climate  2010  Sapporo  International Glaciological Sciety
  
• Records of sea-ice extent and air temperature at the Sea of Okhotsk from an ice core of Mount Ichinsky, Kamchatka  [Not invited]

  Matoba S, Shiraiwa T, Tsushima A. Sasaki, H. Muravyev Y, D

  Interntional Glaciological Society, International Symposium on snow, ice and humanity in a changing climate  2010  Sapporo  International Glaciological Sciety
  
• アラスカ・オーロラピークの化学解析結果  [Not invited]

  對馬 あかね, 的場 澄人, 岡本 祥子, 佐々木 央岳, 福田 武博, 杉山 慎, 白岩 孝行, Dan Solie, 吉川譲二

  日本地球科学惑星連合大会  2010  千葉  日本地球惑星科学連合
  
• 50 YEARS RECORDS OF CLIMATE CHANGES AT THE SEA OF OKHOTSK EXTRACTED FROM AN ICE-CORE OF MOUNT ICHINSKY, KAMCHATKA.  [Not invited]

  Matoba S, Shiraiwa T, Tsushima A, Sasaki H, Muravyev Y.D

  Second international symposium on the Arctic research  2010  Tokyo  National Committee of IASC
  
• カムチャツカ・イチンスキーアイスコアから得られた過去50年間のオホーツク海の気温と海氷の変動  [Not invited]

  的場澄人, 對馬あかね, 佐々木央岳, Y. D. Muravye, 白岩孝行

  平成21年度極地気水圏シンポジウム  2009  東京  国立極地研究所
  
• アラスカ・ランゲル山雪氷コア中の鉄濃度から推定した北部北太平洋域への鉄の沈着量  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  日本地球科学惑星連合大会  2009  千葉  日本地球惑星科学連合
  
• カムチャツカ・イチンスキーアイスコア中の化学プロファイルから得られた気候変動情報  [Not invited]

  的場澄人, 對馬あかね, 佐々木央岳, 白岩孝行

  日本地球科学惑星連合大会  2009  千葉  日本地球惑星科学連合
  
• 北部北太平洋域への大気由来鉄沈着量の推定 -アイスコアとエアロゾル観測からの評価-  [Not invited]

  的場澄人, 西岡 純, 佐々木央岳, 小埜恒夫, 南秀樹, 野村睦, 白岩孝行

  日本エアロゾル学会  2009  金沢  日本エアロゾル学会
  
• カムチャツカ・イチンスキーアイスコア中の水素安定同位体比の負のピークの解釈  [Not invited]

  的場澄人, 對馬あかね, 佐々木央岳, Y. D. Muravye, 白岩孝行

  雪氷研究大会（2009・札幌）  2009  札幌  日本雪氷学会
  
• 流跡線解析を用いたアラスカ・ランゲル山雪氷コア中の鉄フラックスの変動評価  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  雪氷研究大会（2009・札幌）  2009  札幌  日本雪氷学会
  
• アラスカ・オーロラピークの氷コア掘削地における氷河流動数値モデル  [Not invited]

  福田武博, 杉山慎, 白岩孝行, 的場澄人

  雪氷研究大会（2009・札幌）  2009  札幌  日本雪氷学会
  
• 50-year records of climate changes in ice-cores from Kamchatka and Alaska  [Not invited]

  Matoba, S

  ILTS International Symposium "Frontier of Low Temperature Science"  2009  Sapporo  Institute of Low Temperature Science, Hokkaido University
  
• Alpine ice core drilling of Japan  [Not invited]

  Matoba, S

  2nd Asia Alpine Glacier Workshop  2009  Incheon  Korean Polar Reserach Insititute
  
• The Sea of Okhotsk Bountiful sea nutured by sea ice  [Not invited]

  S. Matoba

  Winter Cities Forum  2008  Nuuk, Greenland  Winter City Forum
  
• 北部北太平洋域へのエアロゾル鉄沈着量の推定 - アイスコアからの評価 -  [Not invited]

  佐々木央岳, 的場澄人, 西岡純, 白岩孝行

  日本海洋学会春季大会  2008  東京  日本海洋学会
  
• アラスカ・ランゲル山雪氷コア中の鉄濃度から推定した北部北太平洋への鉄の沈着量  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  雪氷研究大会（2008・東京）  2008  東京  日本雪氷学会
  
• 2008年アラスカ・オーロラピークにおける氷河流動測定・氷厚探査  [Not invited]

  福田武博, 杉山慎, 白岩孝行, 的場澄人

  雪氷研究大会（2008・東京）  2008  東京  日本雪氷学会
  
• アラスカ山脈オーロラピーク雪氷コアの現場解析  [Not invited]

  佐々木央岳, 岡本祥子, 白岩孝行, 的場澄人, 杉山慎, 福田武博, Solie Daniel, 吉川謙二, Benson Carl

  雪氷研究大会（2008・東京）  2008  東京  日本雪氷学会
  
• アラスカ山脈尾ローラピークにおける雪氷コア掘削概方  [Not invited]

  白岩孝行, 的場澄人, 杉山慎, 佐々木央岳, 岡本祥子, 福田武博, Solie Daniel, 吉川謙二, Benson Carl

  雪氷研究大会（2008・東京）  2008  東京  日本雪氷学会
  
• ロシア・カムチャツカ州・イチンスキー氷河コアの化学解析  [Not invited]

  的場澄人, 佐々木央岳, 白岩孝行, Muravyev Yalroslav

  雪氷研究大会（2008・東京）  2008  東京  日本雪氷学会
  
• アラスカ・ランゲル山雪氷コア中の鉄濃度から推定して北部北太平洋への鉄の沈着量  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  平成20年度極域気水圏・生物圏合同シンポジウム  2008  東京  国立極地研究所
  
• ロシア・カムチャツカ州・イチンスキー氷河コアのプロファイル  [Not invited]

  的場澄人, 佐々木央岳, 白岩孝行, Muravyev Yalroslav

  平成20年度極域気水圏・生物圏合同シンポジウム  2008  東京  国立極地研究所
  
• 子ども達の雪氷防災意識向上を継続的に支える試み  [Not invited]

  中村 一樹, 三好 真紀, 久保田 敬二, 石本 敬志, 的場 澄人, 金森 晶作, 樋口 和生

  日本雪氷学会全国大会  2007  富山  日本雪氷学会
  
• アラスカ、ランゲル山コアの精密密度による古環境復元  [Not invited]

  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  2007  富山  日本雪氷学会
  
• アラスカ・ランゲル山コア中の鉄濃度の変動  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  第30回極域気水圏シンポジウム  2007  東京  国立極地研究所
  
• アラスカ・ランゲル山雪氷コア中の鉄濃度の変動  [Not invited]

  佐々木央岳, 的場澄人, 白岩孝行

  日本雪氷学会全国大会  2007  秋田  日本雪氷学会
  
• 氷河観測における日本から送られる気象情報の取得方法  [Not invited]

  的場澄人, 中村一樹, 樋口和生

  日本雪氷学会北海道支部研究発表会  2007  富山  日本雪氷学会
  
• ロシアカムチャツカ・イチンスキー氷河観測報告  [Not invited]

  的場澄人, Ushakov, S. V, 新堀邦夫, 樋口和生, 佐々木央岳, 山崎哲秀, Ovshannikov, A. A, Manevich, A. G, Zhideleeva, T. M, Kutuzov, S, Muravyev, Y. D, 白岩孝行

  日本雪氷学会全国大会  2007  富山  日本雪氷学会
  
• 中国・祁連山脈・七一氷河における表面氷の化学組成  [Not invited]

  三宅 隆之, 植竹 淳, 的場 澄人, 坂井 亜規子, 藤田 耕史, 藤井 理行, 姚 檀棟, 中尾 正義

  日本雪氷学会全国大会  2006  秋田  日本雪氷学会
  
• アラスカ・ランゲル山雪氷コアの酸素・水素同位体比  [Not invited]

  戸井田 武, 白岩 孝行, 的場 澄人

  日本雪氷学会全国大会  2006  秋田  日本雪氷学会
  
• カムチャツカ半島、ウシュコフスキー山アイスコアの水素同位体比から復元される過去2世紀超の気候記録  [Not invited]

  佐藤 建, 白岩 孝行, 的場 澄人

  日本雪氷学会全国大会  2006  秋田  日本雪氷学会
  
• アラスカ雪氷コア中の化学成分と北太平洋十年規模振動との関係  [Not invited]

  的場澄人, 金森晶作, Benson, C. S, 白岩孝行

  日本雪氷学会全国大会  2006  秋田  日本雪氷学会
  
• 雪氷コアによる北部北太平洋の数十年周期気候・大気環境変動の復元  [Not invited]

  白岩 孝行, 東 久美子, 的場 澄人, 金森 晶作, 安成 哲平

  日本雪氷学会全国大会  2005  秋田  日本雪氷学会
  
• 2005年アラスカ、ランゲル山における氷河観測  [Not invited]

  的場澄人, 金森晶作, Benson, C. B, Luethi, M. P, Solie, D, Arendt, A, 白岩孝行

  日本雪氷学会全国大会  2005  秋田  日本雪氷学会
  
• 古気候の世界-氷河から環境をよみとく?  [Not invited]

  的場澄人

  第25会寒地技術シンポジウム  札幌  寒地技術センター
  

Association Memberships

• 日本地球惑星科学連合   国際雪氷学会（International Glaciological Society)   日本雪氷学会   日本エアロゾル学会   Japan Geoscience Union   Internatinal Glaciological Society   

Works

• グリーンランド氷床雪氷調査（SIGMA）

  2011
• クロモフ号によるオホーツク海およびブッソル海峡の海洋観測

  2010
• レゾリュート沖での海氷表面霜の観測

  2010
• カムチャツカ・イチンスキーアイスコアから得られた 過去50年間のオホーツク海の気温と海氷の変動

  2009
• カムチャツカ・イチンスキーアイスコア中の負のδDのピークの解釈

  2009
• 北部北太平洋域への大気由来鉄沈着量の推定 -アイスコアとエアロゾル観測からの評価-

  2009
• フェドチェンコ氷河観測

  2009
• Singals of climate changes in an ice-core obtained from Mount Ichinsky, Kamchatka

  2009
• ロシア・カムチャツカ州・イチンスキー氷河コアのプロファイル

  2008
• ロシア・カムチャツカ州・イチンスキー氷河コアの化学解析

  2008
• アラスカ・オーロラピーク氷河調査

  2008
• 北部北太平洋域へのエアロゾル鉄沈着量の推定 -アイスコアからの評価-

  2008
• ロシアカムチャツカ・イチンスキー氷河観測報告

  2007
• 氷河観測における日本から送られる気象情報の取得方法

  2007
• アラスカ雪氷コア中の化学成分と北太平洋十年規模振動との関係

  2006
• カムチャツカ・イチンスキー山氷河掘削

  2006
• Ice-core drilling at Mt. Ichinsky, Kamchatka

  2006

Research Projects

• 氷河流動による長期物質循環と雪氷微生物の氷河暗色化過程の解明

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2024/04 -2029/03 

  Author : 竹内 望, 杉山慎, 島田利元, 的場澄人, 永塚尚子, 大沼友貴彦, 植竹淳, 藤田耕史, 瀬川高弘
• Investigation of the Impact on Climate Change via a 4-Dimensional Assessment of Material Circulation and Atmospheric Oxidation Capacity in the Antarctic Troposphere

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2024/04 -2028/03 

  Author : 原 圭一郎, 平林 幹啓, 高島 久洋, 的場 澄人, 飯塚 芳徳, 須藤 健悟, 竹中 規訓, 石野 咲子, 矢吹 正教
• Hazard Map based on Numerical snow Avalanche model and Spatio-temporal variation of snow

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2021/04 -2026/03 

  Author : 山口 悟, 西村 浩一, 的場 澄人, 大風 翼, 西森 拓, 伊藤 陽一, 新屋 啓文, 常松 佳恵

   

  風砕や風速変動による積雪構造の時空間的な非一様性のモデル化に関しては, 低温室実験を実施し，風上からの雪粒子の供給と風速に応じて雪面の削剥が起こり，雪紋のような風向に垂直な波状のパターンではなく，風向方向に削剥されたパターンが生じることがわかった. また冬季にニセコの山の尾根周辺に風速計やLiDARを設置し，実際に吹雪が発生して積雪が再配分されている最中の観測を実施し，風速が変動する状況や雪庇が発達する様子を捕えることに成功した．さらに北海道東部の開けた雪原において，吹雪のタワー観測を行い，風速変動に伴う飛雪流量の最大値の評価について検討をするとともに，十分な雪の吹きだまりが形成された状態における吹きだまり内部の積雪密度の分布を取得した． 積雪構造の時空間的な非一様性をフィールドで簡易に測定できる装置の開発に関しては，軽量化にむけた装置の基本設計を引き続き進めるとともに，2021年度に作成した積雪の誘電率を測定することで含水状態を測定する試作機に関して，精度検証のための低温室実験を実施した． 予測誤差を考慮した情報発信技術の開発に関しては，本研究で使用するPCQ法において不確定性のある変数が一つの場合（一変数）に対する確率論的ハザードマップ作成手法を確立した. システムの実用化にむけたスキー場の協力を得た社会実装実験では，2021年度に実施した航空レーザ測量によるニセコアンヌプリ山域全体の積雪深分布およびオルソ画像を，スキー場関係者に公開した．これらはGISソフトを使用することで関係者が自由に拡大縮小して現場の状況を確認することができるため，好意的な反応が得られた．このほか，人工雪崩実験の代わりにスキー場の協力を得て吹雪時に雪庇が発達している最中とその前後に積雪観測を行い，雪庇が不安定な状態から安定化する様子を観測した．
• 北極季節海氷域での海塩組成分別とエアロゾル放出過程のパラメタリゼーション

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2023/06 -2026/03 

  Author : 原 圭一郎, 平林 幹啓, 的場 澄人
• Quantitative evaluation of the three major light-absorbing impurities accelerating glacier ablation

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2020/04 -2025/03 

  Author : 坂井 亜規子, 竹内 望, 青木 輝夫, 的場 澄人, 松井 仁志, 大畑 祥

   

  世界の山岳氷河は温暖化により近年縮小傾向にあり、特にアジア高山域では水資源としての役割を持つ氷河の将来予測に注目が集まっている。本研究は氷河の表面の不純物が日射の吸収率（アルベド）、ひいては氷河の質量収支変動に及ぼす影響を明らかにするという課題である。 現地観測を行うことができなかったため、研究対象とするモンゴル西部の氷河について気象データや衛星画像から氷河表面の日射吸収率の変動と気温や降水量の変動を解析し、氷河の質量収支変動と比較して解析を行った。この結果氷河の質量収支は2000年から減少し続けているが、その減少速度は2010年以降2020年までは2000-2010年と比較すると約半分になっており、減少速度が低下している。この原因として気温の低下、降水量の増加、アルベドの上昇の3つの可能性が挙げられるが、解析の結果、気温は2000-2020年にかけて特に増減の傾向は無く、夏季を除く降水量の増加とアルベドの上昇が原因であることがわかった。このように、氷河の変動と気象要素を丁寧に解析を行うと、気温変動によって氷河の質量収支は変動しているわけではなく、降水量や降雪に伴うアルベドの変化により、氷河の質量が変動していることがわかった。 また、過去の観測データの解析により、氷河消耗域の裸氷帯のアルベドには光吸収性不純物の量だけでなく、氷自体の変化、氷が日射の透過吸収によって融解し形成される風化氷も重要であることが明らかとなってきた。
• Development of an advanced method for monitoring the Arctic environments using GCOM-C/SGLI and the in-situ data collection and the collaboration with a numerical climate model for enhancing the value of the SGLI cryosphere products

  JAXA：第3回地球観測研究

  Date (from‐to) : 2022/04 -2025/03 

  Author : Hori M, K. Sugiura, T. Aoki, T. Tanikawa, M. Niwano, A. Hachikubo, S. Matoba
• Arctic Challenge for Sustainability II

  環境技術等研究開発推進事業費補助金事業

  Date (from‐to) : 2020/06 -2025/03
• 世界一の確度をもつ過去200年間の沈着エアロゾルのデータベース創成と変遷解明

  日本学術振興会：科学研究費助成事業 基盤研究(S)

  Date (from‐to) : 2020/06 -2023/03 

  Author : 飯塚芳徳
• 次世代積雪物理量測定技術開発と精密積雪物理モデルに基づく雪氷圏変動監視手法の確立

  日本学術振興会：科学研究費補助金 基盤研究(A)

  Date (from‐to) : 2015/04 -2021/03 

  Author : 山口悟
• Freshwater discharge from the Kamchatka Peninsula controls Pan-Okhotsk land-ocean linkage system

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2017/04 -2020/03 

  Author : Mitsudera Humio

   

  Oyashio is one of most highly productive ocean in the world. This is owing to the Pan-Okhotsk land-ocean linkage system that provides the Oyashio with iron, an essential micronutrient, originating in wetlands in the Amur River basin via intermediate-layer circulation in the Sea of Okhotsk. This project aimed to elucidate roles of precipitation, snow and glacier over the Kamchatka Peninsula, which transfers information of atmospheric variations to the ocean through riverine discharge. We hypothesized that the riverine discharage from the peninsula may control the Pan-Okhotsk land-ocean linkage system. We have found that (1) the total amount of discharge from the Kamchatka Peninsula is approximately 80% of that of the Amur River, and (2) freshwater from the Kamchatka Peninsula gives more impacts on salinity of the dense shelf water that drives the intermediate-layer circulation than that from the Amur River does.
• Recent surface darkening and abrupt melting of Greenland ice sheet (SIGMA2)

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2016/04 -2020/03 

  Author : Aoki Teruo

   

  In order to clarify the recent surface melting of the Greenland ice sheet, in-situ field observations, satellite remote sensing and numerical modelling were conducted. In the field observations, existing automatic weather station observations were continued and the data were published. Ice core samples were analyzed to characterize water vapor and mineral dust transport. In satellite remote sensing, we developed an algorithm to retrieve the snow and ice physical parameters using a non-spherical snow particle shape model and quantified the causes of ice sheet surface darkening. In numerical modelling, a regional meteorological model including the detailed processes of light-absorbing aerosols (LAA) was developed. A regional meteorological model including snow metamorphism was used to simulate the time and spatial variation of ice sheet surface melting. In addition, the radiative forcing due to LAA in the atmosphere and snow/ice was estimated by an earth system model.
• グリーンランド氷床コアに含まれる水溶性エアロゾルを用いた人為的気温変動の解読

  日本学術振興会：科学研究費補助金 基盤研究(A)

  Date (from‐to) : 2014/04 -2019/03 

  Author : 飯塚芳徳
• Frost flowers and sea-salt aerosols over seasonal sea-ice areas in north-western Greenland during winter-spring

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2013/04 -2017/03 

  Author : HARA Keiichiro, HIRABAYSHI Motohiro, YAMSAKI Tetsuhide

   

  Simultaneous observations of frost flowers, brine, and aerosol particles were conducted around Siorapaluk in northwestern Greenland. Water-soluble frost flower and brine constituents are sea salt constituents. Concentration factors of sea-salts of frost flowers and brine relative to seawater were 1.14 - 3.67. Sea-salt enrichment of Mg2+, K+, Ca2+, and halogens in frost flowers related to associated with sea-salt fractionation. High aerosol number concentrations correspond to higher abundance of sea-salt particles in both coarse and fine modes, and blowing snow and strong winds. Coarse and fine sea-salt particles were found to be rich in Mg. Strong Mg enrichment might be more likely to proceed in fine sea-salt particles. Mg-rich sea-salt particles might be released from the surface of snow and slush layer on sea-ice and frost flowers. Mirabilite-like and ikaite-like particles were identified only near new sea-ice areas. We propose and describe sea-salt cycles in seasonal sea-ice areas.
• 山岳氷河アイスコア解析による北太平洋地域における小氷期以降の気候・環境変動復元

  日本学術振興会：科学研究費補助金 基盤研究(C)

  Date (from‐to) : 2014/04 -2017/03 

  Author : 的場澄人
• Effects of snow impurities and glacial microbes on abrupt warming in the Arctic

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

  Date (from‐to) : 2011/04 -2016/03 

  Author : Aoki Teruo, MOTOYAMA Hideaki, TAKEUCHI Nozomu, MATOBA Sumito, HORI Masahiro, HACHIKUBO Akihiro, YAMAGUCHI Satoru, TANAKA Yasumichi, IWATA Yukiyoshi, SUGIURA Konosuke, KODAMA Yuji, FUJITA Koji, KUCHIKI Katsuyuki, NIWANO Masashi, HOSAKA Masahiro, HASHIMOTO Akihiro, TANIKAWA Tomonori, TANAKA Yasumichi, UETAKE Jun, NAGATSUKA Naoko, SUGIYAMA Shin, MOTOYOSHI Hiroki, SHIMODA Seiji, MOTOYA Ken

   

  From field observations on Greenland ice sheet, it was found that the contribution to albedo reduction in accumulation area by snow impurities such as black carbon (BC) is smaller than that by snow grain growth. Drastic surface melting event in July 2012 was accelerated by downward longwave radiation from low cloud. In ablation area, glacial microbes were contained in surface impurities and could contribute to the albedo reduction remarkably. Satellite remote sensing confirmed that the cause of darkening of ice sheet surface after 2000 is snow grain growth in accumulation area and the expansions of bare ice and dark area including glacial microbes in ablation area. We drilled a 223 m ice core in northwest Greenland ice sheet and analyzed the BC concentrations since 1660, which has a peak around 1920-1930 several times higher than the present value.
• 北極域における積雪汚染及び雪氷微生物が急激な温暖化に及ぼす影響評価に関する研究

  日本学術振興会：科学研究費補助金 基盤研究(S)

  Date (from‐to) : 2011/04 -2016/03 

  Author : 青木輝夫
• Elucidation of thermohaline/biogeochemical circulation systems connecting the Sea of Okhotsk with subarctic North Pacific Ocean

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2010/04 -2015/03 

  Author : WAKATSUCHI Masaaki, MITSUDERA Humio, NISHIOKA Jun, NAKAMURA Tomohiro, EBUCHI Naoto, WATANABE Yutaka, SUZUKI Koji, KURODA Hiroshi, OHSHIMA Keiichiro, TSUMUNE Daisuke, MATOBA Sumito

   

  We investigated the thermohaline/biogeochemical circulation systems, connecting the Sea of Okhotsk with the North Pacific, to elucidate a ‘miraculous mechanism’ that supports abundant fisheries resources in the Okhotsk and Oyashio regions. Salinity of the dense shelf water (DSW) over the northern shelf of the Okhotsk Sea controls the strength of the thermohaline circulation of the North Pacific Ocean. DSW salinity is determined by relative contribution among the salinity anomaly that propagates long distance from the subarctic gyre, freshwater anomaly by precipitation, and saline water anomaly rejected during sea ice formation. DSW entrains nutrients such as iron, originating in the Amur River and deposited over the continental shelf, and spreads these materials to the North Pacific Ocean. This study has revealed an exquisite thermohaline-biogeochemical system coupled through DSW and tidal mixing, which controls primary production in the large area of the subarctic North Pacific.
• Development of clean technique for trace metal measurement method in the sea ice

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2011 -2012 

  Author : NISHIOKA Jun, MATOBA Sumito

   

  We developed two clean analytical procedure for determining iron and aluminium concentrations in the sea ice. One is the method that removed contaminated outer layer of sea ice. The sea ice corer is collected by a lightweight filament tube with an aluminum cutting shoe and heat-treated steel cutting teeth. The outer layers of core were carefully removed using a ceramic knife to remove contaminated part during coring. The other method is comprised by ice meltar and in-line sampling and Fe analytical system. These method were applied to oridinary a sea ice collected from the Sea of Okhotsk.
• 海洋表層マッピングによる親潮域の鉄供給過程の評価

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2009 -2010 

  Author : 西岡 純, 小埜 恒夫, 的場 澄人

   

  親潮域の生物生産を支える鉄の供給過程を明らかにするために下記の研究を進めた。 本年度は、これまでに実施してきた観測研究の結果に基づき、大気ダスト由来と海洋循環由来の鉄の供給過程が、親潮域・混合域の植物プランクトン増殖に対してどのような役割を果たしているのかについて、定量的・定性的に評価する事を試みた。また、それぞれの供給過程に関わる重要なプロセスやパラメータを抽出した。 その結果、海洋内部の循環は、明瞭な季節的変動を駆動する供給過程であり、中層の循環によるオホーツク海からの高い鉄濃度水塊の移送、千島海峡の混合過程を介した鉄濃度の再分配、冬季の混合層発達による高鉄濃度水塊の表層への回帰などが重要なプロセスとして挙げられた。この海洋循環で供給されている鉄分は、毎年春季に起こる植物プランクトンのブルームを生み出すために利用されている。一方、大気ダスト経由の鉄は、冬季～春季にイベント的に供給されており、バックグランドにある海洋循環で決まる鉄濃度の周年変動に上乗せして、突発的に、また空間的には不均一に供給されるものであると推察された。表層鉄濃度の周年変動に影響を与えるレベルの供給量ではないが、年間に数回から十回程度、植物プランクトン増殖にインパクトを与えるレベルの鉄を供給するイベントが発生している可能性があることが分かった。以上の研究結果から、それぞれの鉄供給過程は、海洋の生物生産に対してそれぞれの役割を持ち、違った特徴の生態系の応答を導いていると考えられる。
• Simultaneous investigation s on acid snow in Japan

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2008 -2010 

  Author : SATO KAZUHIDE, KAMEDA Takao, ISHII Yoshiyuki, MATOBA Sumito, TAKAHASHI Kazuyoshi, ISHIZAKA Masaaki, TAKEUCHI Yukari, YOKOYAMA Koutarou, KOMINAMI Yasuhiro, KAWADA Kunio, WATANABE Kouichi, IIDA Toshiaki, IGARASHI Makoto, TAKEUCHI Nozomi

   

  Snow samples were gathered from Hokkaido Island to Yamagata, Niigata and Toyama Prefectures in the Mainland in winter. By analyzing the chemical characteristics of these samples concerning an acid snow, the actual conditions were investigated. A lot of findings were obtained concerning the hydrogen peroxide concentration of snow that the reports on its concentration are very little. Some relations were seen among the air pollutant substances, the major ion concentrations, the hydrogen peroxide concentrations, the pH of snow and the snow algae, etc., and the selective elutions of the ion of snowmelt water were observed, though a further observation is necessary for the grasp of a clearer relation.
• Reconstruct of depositions of terrestrial materials into the northern North Pacific by ice-core analysis

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2007 -2009 

  Author : SHIRAIWA Takayuki, MATOBA Sumito, YAMATAGA Kotaro, SUGIYAMA Shin, IIZUKA Yoshinori, YOSHIKAWA Kenji, SASAKI Hirotaka, FUKUDA Takehiro, TSUSHIMA Akane

   

  In order to study the relationship between the North Pacific climate regime shift and ocean primary production, we analyzed iron concentrations in an ice core drilled at Aurora Peak, Alaskan Range. It was found that the averaged iron deposition was 8.8mg m^2yr^<-1> for the last 10 years, but it was 29 and 19mg m^2yr^<-1> for 2001 and 2002 when there were significant Kosa events. The results suggest that the atmospheric iron deposition to the upper 30-m mixed layer will not affect the biomass production in average but the amounts as recorded in 2001 and 2002 will be high enough to affect the ocean primary production.
• 西部北太平洋亜寒帯域(親潮域)表層の鉄濃度の変動と大気ダスト供給量との関係

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2007 -2008 

  Author : 西岡 純, 小埜 恒夫, 的場 澄人

   

  本研究の目的は、大気ダスト経由の鉄供給が亜寒帯域表層の鉄濃度の変動にどのように寄与しているかを定量的に評価することである。研究期間内に次のI)〜III)の項目について研究を行った。I)親潮海域の定線観測(Aライン観測)において、表層鉄濃度の季節的変動を含めた時系列観測を継続して行った。II)実海域の海表層付近の大気ダスト中に含まれる鉄量の季節的な変化を観測するとともに、海水中で大気ダストから鉄がどの程度溶出してくるかを、室内実験および船上実験において検討した。III)IIのデータおよび、季節毎の親潮海域へのダストの沈着量を、Iで得られる表層鉄濃度の季節的な変動とともに解析することで、大気ダスト経由の鉄供給が亜寒帯域表層の鉄濃度の変動にどのように寄与しているかを定量的に評価した。 これらの内容を含む本研究の結果より、当概海域の季節的な鉄濃度の変動とダストおよび海洋内循環の供給過程の寄与が明らかになってきた。親潮域表層の鉄濃度の季節的な変動は概ね次のように説明できる。親潮域では, 冬季の鉛直混合の活発な時期に下層から表層に供給され, 春季のブルーム期にほぼ枯渇するまで減少する主要栄養塩と同様のサイクルを示す。しかし, 各観測時の測点間のばらつきは明瞭であり, 冬季に詳細なマッピングを行った結果, 鉄濃度の変化は水塊の違い(混合層の発達過程の違い)にも支配されていることが分かってきた。これらの結果は, これまで考えられてきた大気経由の鉄供給に加えて, 冬季の混合過程, 水塊の水平移動, 亜表層の鉄循環などのプロセスが海洋表層の鉄濃度の変化を引き起こす重要な要因になっていることを示している。これらの結果は, 大気から海洋表層への鉄供給を評価するためには, まず海洋循環で決まる鉄濃度のバックグランド変動を把握した上で, 大気からのシグナルを抽出することが重要であることを示している。
• 積雪空隙内に存在する化学成分の存在形態とその挙動に関する研究

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2006 -2007 

  Author : 的場 澄人

   

  大気エアロゾルから積雪中の化学シグナルが形成される過程には、(1)降雪へのエアロゾルの取り込み過程、(2)積雪内での化学成分の移動と大気への放出、(3)積雪内での化学反応、(4)融雪をともなう化学成分の溶出と移動、(5)氷河流動による層序の擾乱、が挙げられる。本研究の目的は、これらの諸過程の中で(2)と(3)の過程と機構に着目し、積雪内での化学成分の挙動、存在形態を明らかにすることである。 北海道幌加内町母子里にある当研究所融雪観測室において積雪の空隙内の存在する化学成分の挙動を調べた。積雪内に金属パイプを陥入しポンプによって空隙内の空気を吸引し,空隙内のエアロゾル成分とガス成分をフィルター上に捕集した。また同時に積雪直上の大気中のエアロゾルとガス成分をフィルター上に捕集した。捕集した成分は、イオンクロマトグラフィーで化学成分の定量を行った。 その結果、昨年と同じように空隙内での存在が肯定的ではなかったエアロゾルが検出された。空隙内のエアロゾル濃度と大気中のエアロゾル濃度の変動は全く異なった挙動を示した。また、大気中のナトリウム濃度は10倍以上の変化を示したのに対し、空隙内のエアロゾルはほぼ一定の値を示した。このことから、空隙内から採取されたエアロゾルは、大気の影響を直接うけたものではなく、大気の変化とは独立して空隙内にエアロゾルが存在することが示唆された。また空隙内のエアロゾルは化学成分によっても挙動が異なった。これは温度や温度勾配の違いが化学成分の挙動の違いに現れたのではないかと推測される。 以上の結果から、積雪内の化学成分挙動を明らかにする重要性が確認され、今後のアイスコアの解釈のための研究の発展が大いに期待される。
• Chemical features and the mechanism of the preferential elution of the major ion in acidic snow melting water by acid shock

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2004 -2006 

  Author : SATOW Kazuhide, HATA Katsuji, MATOBA Sumito

   

  To clarify the realities of an acid snow in Japan, snow pit studies was carried out at several places in Hokkaido, and Honshu in Japan, and the snowfall sample was able to be obtained. Moreover, the precipitation once a day was gathered throughout the year at this school in Nagaoka City. Regional differences and elevation - differences could be understood in distribution of acid substances in snow and snow melting features. To search the behavior of the ion at snow-melting, the thermal analyses of the melting water of snow were done with Differential Scanning Calorimetry to analyses of the melting temperature and melting energy of uniting water and free water with different ion species and ion concentrations. The difference of flow out speed between different ion species can be seen, but also between different snows. It seems to be related to different ions and ion concentrations. Precipitation in winter was classified into three forms of hailstone, snow and rain, to examine the characteristic of ion concentrations by the difference of the form of precipitation. Each concentration of the major ions showed some different features. To examine an atmospheric chemistry system in the background of pH value in precipitation, measurements of hydrogen peroxide (H_2O_2) concentration in precipitation were carried out. H_2O_2 has a strong correlation with OH-radical that becomes the leading part of the oxidation of SO_2 and NO_2 in atmosphere. This research accomplishment was delayed because the severe earthquake attacked Chuetsu region, Niigata Prefecture, in October, 2004. However, the measurement of H_2O_2 concentration will become possible soon and some interesting results are being obtained. The H_2O_2 concentration in precipitation of winter at Nagaoka City indicated a high value in daytime. Moreover, a tendency that the H_2O_2 concentration decreases was seen as precipitation increased. Examining the relation between SO_4^<2-> and NO_3^- -H_2O_2 concentration, an especially clear correlation was not obtained though a constant tendency was seen.
• RECONSTRUCTION OF CLIMATE AND ATMOSPHERIC TRANSPORT BY MEANS OF ICE CORE ANALYSES IN THE NORTH PACIFIC

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2004 -2005 

  Author : SHIRAIWA Takayuki, NAKATSUKA Takeshi, TACHIBANA Yoshihiro, YAMAGATA Kotaro, MATOBA Sumito

   

  We analyzed the ice core drilled at Mt.Wrangell in 2004. The analyses were made for the upper 100m of the 217-m long ice core. They are hydrogen isotope ratio (0-50m), major ions (0-50m), dust concentration (0-80m), X-ray density (0-100m) and tritium (0-50m). Trace elements were also measured for the Mt.Logan ice core which we drilled in 2002. Following results are obtained by this research project : 1.Clear seasonal cycles are found for the upper 50m of the ice core in the cases of hydrogen isotope ratio, dust and tritium concentrations. The peaks appeared in summer for delta D and spring for the dust and tritium concentrations. 2.Standard deviation in the X-ray density variations are negatively related with delta D suggesting that the high density variations occur in spring-summer period when snow falls rather intermittently. 3.Concentration in dust becomes higher in spring and lower in the other periods. It is also found that the dust concentration has been increasing since 2000, which coincides with observation of dust falls in Japan. 4.Tritium concentration in the Wrangell ice core shows a beautiful seasonal cycle having the highest peak in spring. This is due to the so-called "Stratosphere-Troposphere Exchange" in air mass and the concentration can be a promising indication of atmospheric disturbances in spring. 5.Sodium flux is positively correlated with Pacific Decadal Oscillations suggesting the atmospheric-oceanic interaction in the North Pacific. 6.Annual Iron fluxes during the period 1980-2000 in the Logan ice core were varying from several μg/square m to 80μg/square m. The source of the iron can be ascribed to Asian dust and the nearby volcanoes. 7.Annual accumulation rates both in the Wrangell ice core and the Logan ice core showed clear negative relationship for the last 100 years, suggesting that the PDO has impacted mountain precipitation significantly.
• 親潮域へ沈着する大気ダストの生物生産への影響評価

  日本学術振興会：科学研究費補助金

  Date (from‐to) : 2005
• Studies on long-range tansport and deposiltion processes of ail Pllutants using ice cores

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 1999 -2001 

  Author : AZUMA Kumiko, MATOBA Sumito, MATOYAMA Hideaki, FUJII Yoshiyuki

   

  Ice core studies have shown that sulfate and nitrate concentrations in Arctic snow have increased significantly since the end of the 19th century due to the influx of anthropogenic pollutants transported from industrialized regions. Trends of increasing sulfate and nitrate concentrations in snow are evident in all the ice core data from Greenland, the Canadian Arctic, and Svalbard. Temporal patterns, however, show spatial variation. The difference between the magnitude and timing of increasing trends of the sulfate ions at different Arctic sites can be attributed to their having different source regions and pathways for these pollutant ions. The pollutant sources appear to be North America for south Greenland, Devon Island and Baffin Island, Eurasia, for Ellesmere Island and Svalbard, and both North America and Eurasia for central and north Greenland. An ice core from Svalbard showed significant decreases of both sulfate and nitrate concentrations since the 1970s. These decreases could be partly attributed to the strict pollution control started in the 1970s, but they are also partly due to the changes in atmospheric circulation dominated by the North Atlantic Oscillation.
• Reconstruction of paleo climate in the North Pacific from ice-cores obtaind from Alaska and Kamchatka

  Date (from‐to) : 2001

Social Contribution

• グリーンランドの人々の暮らし

  Date (from-to) : 2018/03/07

  Role : Lecturer

  Sponser, Organizer, Publisher  : 上札内交流館事業，上札内交流館

  Event, Program, Title : 雪と氷の不思議な世界，講演・体験学習会
• International Symposium on Cryosphere and Biosphere

  Date (from-to) : 2018/03

  Role : Organizing member

  Sponser, Organizer, Publisher  : International Glaciological Society
• "雪の結晶”は戻ってきますか？・・・六花型ブーメランを作って飛ばそう

  Date (from-to) : 2018/02/18

  Role : Demonstrator

  Sponser, Organizer, Publisher  : サイエンススパークス，札幌ドーム，札幌市

  Event, Program, Title : 科学の祭典札幌冬の大会
• 子育て、ライブイベントとフィールドワーク

  Date (from-to) : 2017/10/26

  Role : Lecturer

  Sponser, Organizer, Publisher  : 北海道大学低温科学研究所
• Meteorological and Glaciological Observation at Greenland Ice Sheet

  Date (from-to) : 2017/03/11

  Role : Lecturer

  Sponser, Organizer, Publisher  : 北海道札幌啓成高等学校、札幌市青少年科学館、北海道教育委員会

  Event, Program, Title : 北海道科学英語発表・交流会
• 温暖化とグリーンランド氷床の変化

  Date (from-to) : 2016/11/07

  Role : Lecturer

  Sponser, Organizer, Publisher  : 低温科学研究所、北極地域研究センター、THE MUSIC PLANT、ArCS北極域研究推進プロジェクト

  Event, Program, Title : グリーンランドをめぐる音楽・冒険・サイエンス –北極域の持続可能な未来にむけて−
• 心ゆさぶれ！先輩ROCK YOU

  Date (from-to) : 2014/12/27

  Role : Informant

  Sponser, Organizer, Publisher  : 日本テレビ

  Event, Program, Title : 心ゆさぶれ！先輩ROCK YOU
• ためしてナットク「雪と氷のふしぎ」

  Date (from-to) : 2014/09/23

  Role : Demonstrator

  Sponser, Organizer, Publisher  : 日本雪氷学会

  Event, Program, Title : 子どもと雪氷を楽しむ会
• 地球温暖化とグリーンランド氷床の変化

  Date (from-to) : 2013/12/06

  Role : Lecturer

  Sponser, Organizer, Publisher  : 朝日新聞北海道支社、北海道テレビ放送
• 雪を知ろう：雪ってどんなもの？

  Date (from-to) : 2013/01/09

  Role : Lecturer

  Sponser, Organizer, Publisher  : 大雪・富良野ルートサポートセンター

  Event, Program, Title : ウィンターサーカス・雪のワークショップ
• 子どもの北大構内かんじき散歩と雪氷の観察会

  Date (from-to) : 2010/01/09

  Role : Lecturer

  Sponser, Organizer, Publisher  : 北海道自然観察協議会
• 世界の雪氷圏めぐりツアー

  Date (from-to) : 2009/10/03

  Role : Lecturer

  Sponser, Organizer, Publisher  : 日本雪氷学会

  Event, Program, Title : 「雪と氷の『ふしぎ』を一緒に考えよう「雪氷楽会in SAPPORO」
• 雪から知る地球のひみつ

  Date (from-to) : 2009/01/31

  Role : Demonstrator

  Sponser, Organizer, Publisher  : こどもエコクラブ交流会

  Event, Program, Title : 雪から知る地球のひみつ
• グリーンランドの生活

  Date (from-to) : 2008/02/11

  Role : Lecturer

  Sponser, Organizer, Publisher  : 小樽市総合博物館

  Event, Program, Title : 雪に学び雪を楽しむ「雪氷楽会」in小樽市総合博物館
• グリーンランドと地球温暖化

  Date (from-to) : 2007/07/28

  Role : Lecturer

  Sponser, Organizer, Publisher  : 札幌国際プラザ

  Event, Program, Title : グリーンランドを知るセミナー
• 雪国の自然現象を再現する−流氷と雪結晶−

  Date (from-to) : 2006/07/30

  Role : Demonstrator

  Event, Program, Title : 青少年のための科学の祭典2006年全国大会
• 雪から学ぶわくわく体験『雪氷楽会』in北大

  Date (from-to) : 2006/01/14

  Role : Planner

  Event, Program, Title : 雪氷楽会in北大

Media Coverage

• あす『雪と氷』体験学習会、中札内JAXA研究者ら講師

  Date : 2018/03/08

  Publisher, broadcasting station: 十勝毎日新聞

  Program, newspaper magazine: 十勝毎日新聞

  Paper
• 三都市積雪データ公開へ

  Date : 2017/03/24

  Publisher, broadcasting station: 朝日新聞

  Program, newspaper magazine: 朝日新聞北海道版

  Paper
• Bulletin of Glaciological Research編集委員

  Date : 2016

  Pr
• グリーンランドで先住民族伝統の犬ぞりが活躍 氷の結晶『フロストフラワーを探しに』

  Date : 2015/05/12

  Program, newspaper magazine: 朝日新聞

  Paper
• 北極は『地球の窓』

  Date : 2015/01/01

  Program, newspaper magazine: 岩手日日新聞、夕刊デイリー、釧路新聞、陸奥新報、中國新聞、長野日報、苫小牧民報

  Paper
• 「雪氷」編集委員

  Date : 2015

  Publisher, broadcasting station: 日本雪氷学会

  Pr
• 伝説の犬ぞり北極快走 研究者乗せ薄い海氷で活躍

  Date : 2014/05/12

  Program, newspaper magazine: 朝日新聞夕刊

  Paper
• 氷の華み〜つけた

  Date : 2014/05/01

  Program, newspaper magazine: 朝日小学生新聞

  Paper
• 厳冬グリーンランドに“幻の氷の華”を見た

  Date : 2014/03/30

  Publisher, broadcasting station: BS朝日

  Program, newspaper magazine: いま世界は

  Media report
• 北海道宝島2014・フロストフラワー

  Date : 2014/02/02

  Publisher, broadcasting station: FM北海道

  Program, newspaper magazine: 北海道宝島2014

  Media report
• 12月6日ポプラ広場「グリーンランド温暖化の最前線から」開催

  Date : 2013/11/07

  Program, newspaper magazine: 朝日新聞

  Paper
• たびばん・北大をディープに探索

  Date : 2013/06/23

  Publisher, broadcasting station: STV

  Program, newspaper magazine: たびばん

  Media report
• 北極氷河 激流と化す

  Date : 2012/09/17

  Program, newspaper magazine: 朝日新聞

  Paper
• Bulletin of Glaciological Research編集

  Date : 2010

  Publisher, broadcasting station: 日本雪氷学会

  Pr
• 知識深める秋 温暖化を防ぎ動物守ろう 円山動物園で『雪氷楽会』

  Date : 2009/10/03

  Program, newspaper magazine: 北海道新聞

  Paper
• オホーツク海の栄養探せ 氷河掘削 黄砂を調査 北大低温研，カムチャツカで

  Date : 2006/04/01

  Program, newspaper magazine: 北海道新聞

  Paper