Sep. 2022, 講談社, 第38回講談社科学出版賞
南極の氷に何が起きているか ー気候変動と氷床の科学
杉山慎, 31688139

May 2019, 日本雪氷学会 北海道支部, 北海道雪氷賞（北の六華賞）　　　　　　　　　　　　　　　
南極ラングホブデ氷河における熱水掘削
杉山 慎

Mar. 2015, 北海道大学, 教育総長奨励賞　　　　　　　　　　　　　　　
杉山 慎

Sep. 2013, 社団法人日本雪氷学会, 学術賞　　　　　　　　　　　　　　　
氷河・氷床の底面動力学プロセスの研究
杉山 慎

2011, 社団法人日本雪氷学会 2011年度 論文賞　　　　　　　　　　　　　　　
Japan

Artisanal longline fishing for Greenland halibut (Reinhardtius hippoglossoides) operated under sea ice using a metal plate kite in northwest Greenland
Kenzo Tanaka, Makoto Tomiyasu, Ryo Kusaka, Shin Sugiyama, Evgeny A. Podolskiy, Yasuzumi Fujimori
Fisheries Research, 281, 107203, 107203, Elsevier BV, Jan. 2025, [Peer-reviewed]
English, Scientific journal, 27685771

アラスカ南東部タク氷河が前進から後退に転ずる時期の氷河末端位置と流動速度の変化
張佳晏, 杉山慎, Jason Amundson, Lynn Kaluzienski
北海道の雪氷, 43, 25, 28, Sep. 2024
Japanese

東南極ラングホブデ氷河接地線における氷震モニタリング
箕輪昌紘, 近藤研, Evgeny Podolskiy, 藤田耕史, 杉山慎
北海道の雪氷, 43, 33, 36, Sep. 2024, [Corresponding author]
Japanese

グリーンランド北西部カナック氷河におけるUAV測量による表面変化の解析
山田宙昂, 鵜飼慎太, 杉山慎
北海道の雪氷, 43, 29, 32, Sep. 2024, [Corresponding author]
Japanese, 27685771

2024年3月に利尻山と羊蹄山で発生した雪崩の調査報告
原田裕介, 杉山慎, 下山宏, 立本明広, 佐々木大輔, 佐々木翔平, 國見祐介, 日本雪氷学会北海道支部雪氷災害調査チーム
北海道の雪氷, 43, 8, 12, Sep. 2024
Japanese

Community perspectives inform coastal marine ecosystem research in northwestern Greenland
Mayuko Otsuki, Shin Sugiyama
Polar Science, 101112, 101112, Elsevier BV, Sep. 2024, [Peer-reviewed], [Invited], [Last author]
English, Scientific journal, 27685771

Geometry and thermal regime of the southern outlet glaciers of Qaanaaq Ice Cap, NW Greenland　　　　　　　　　　　　　　　
Lamsters, K, Karušs, J, Ješkins, J, Džeriņš, P, Ukai, S, Sugiyama, S
Earth Surface Processes and Landforms, Aug. 2024, [Peer-reviewed]
English, Scientific journal

Impacts of glacial discharge on the primary production in a Greenlandic fjord
Yasuhiro Hoshiba, Yoshimasa Matsumura, Naoya Kanna, Yoshihiko Ohashi, Shin Sugiyama
Scientific Reports, 14, 1, Springer Science and Business Media LLC, Jul. 2024, [Peer-reviewed]
Scientific journal, Abstract

Subglacial discharge from marine-terminating glaciers in Greenland injects large volumes of freshwater and suspended sediment into adjacent fjord environments. Although the discharge itself is nutrient poor, the formation of meltwater plumes can enhance marine biological production by stimulating upwelling of nutrient-rich fjord water. Despite the importance of meltwater discharge to marine ecosystems, little is known of the quantitative impact of discharge processes on phytoplankton growth, including the effects of local plumes, fjord-wide stirring and mixing, and suspended sediments on net primary production (NPP). Here, we report simulations of Bowdoin Fjord in northwestern Greenland using coupled non-hydrostatic ocean circulation and lower-trophic level ecosystem models, developed using field data. Our findings demonstrate that subglacial discharge plays a crucial role in NPP by stirring and mixing the entire fjord water system, which has a greater effect on NPP than local plume upwelling. Sensitivity tests suggest a 20% increase in NPP under conditions of enhanced discharge anticipated in the future. However, if glacier discharge and retreat exceed critical levels, NPP is predicted to decline by 88% relative to present values. This pattern reflects the negative impact of increased sediment flux on photosynthesis and weakened fjord stirring and mixing resulting from shallower outlet depths.

Ice speed of a Greenlandic tidewater glacier modulated by tide, melt, and rain
Shin Sugiyama, Shun Tsutaki, Daiki Sakakibara, Izumi Asaji, Ken Kondo, Yefan Wang, Evgeny Podolskiy, Guillaume Jouvet, Martin Funk
EGU Sphere, Copernicus GmbH, 29 May 2024
Abstract. Ice discharge from the Greenland ice sheet is controlled by tidewater glacier flow speed, which shows significant variations in different timescales. Short-term speed variations are key to understanding the physical processes controlling glacial motion, but studies are sparse for Greenlandic tidewater glaciers, particularly near the calving front. Here, we present high-frequency ice speed measurements performed at 0.5–4 km from the front of Bowdoin Glacier, a tidewater glacier in northwestern Greenland. Three GPS (global positioning system) receivers were operated for several weeks in July of 2013–2017 and 2019. Horizontal ice speed varied over timescales of hours to days, including short-term speed-up events as well as diurnal and semidiurnal variations. Frequency analysis revealed that semidiurnal signals decay upglacier, whereas diurnal signals are consistently observed over the area of study. Speed-up events were associated with heavy rain, and longer-term variations were correlated with air temperature. Uplift of the glacier surface was observed during fast-flowing periods, suggesting basal separation due to elevated water pressure. These observations confirm the strong and immediate impact of melt/rainwater on subglacial water pressure and sliding speed. Tidally modulated ice speed peaks coincided with or slightly before low tide, which demonstrates the key role viscoelastic ice dynamics play in response to changing hydrostatic pressure acting on the glacier front. Our study results reveal details of short-term flow variations near the front of a Greenlandic tidewater glacier and provide insights into calving glacier dynamics. During melt season, ice speed is controlled by atmospheric conditions through meltwater production and rain events as commonly observed in alpine glaciers, but additional complexity arises from tidal influence near the calving front.

Characteristics and changes of glacial lakes and outburst floods
Guoqing Zhang, Jonathan L. Carrivick, Adam Emmer, Dan H. Shugar, Georg Veh, Xue Wang, Celeste Labedz, Martin Mergili, Nico Mölg, Matthias Huss, Simon Allen, Shin Sugiyama, Natalie Lützow
Nature Reviews Earth and Environment, Springer Science and Business Media LLC, 21 May 2024
Scientific journal, 46253701

The foundations of the Patagonian icefields
Johannes J. Fürst, David Farías-Barahona, Norbert Blindow, Gino Casassa, Guisella Gacitúa, Michèle Koppes, Emanuele Lodolo, Romain Millan, Masahiro Minowa, Jérémie Mouginot, Michał Pȩtlicki, Eric Rignot, Andres Rivera, Pedro Skvarca, Martin Stuefer, Shin Sugiyama, José Uribe, Rodrigo Zamora, Matthias H. Braun, Fabien Gillet-Chaulet, Philipp Malz, Wolfgang J.-H. Meier, Marius Schaefer
Communications Earth and Environment, 5, 1, Springer Science and Business Media LLC, 22 Mar. 2024
Scientific journal, Abstract

The two vast Patagonian icefields are a global hotspot for ice-loss. However, not much is known about the total ice volume they store - let alone its spatial distribution. One reason is that the abundant record of direct thickness measurements has never been systematically exploited. Here, this record is combined with remotely-sensed information on past ice thickness mapped from glacier retreat. Both datasets are incorporated in a state-of-the-art, mass-conservation approach to produce a well-informed map of the basal topography beneath the icefields. Its major asset is the reliability increase of thicknesses values along the many marine- and lake-terminating glaciers. For these, frontal ice-discharge is notably lower than previously reported. This finding implies that direct climatic control was more influential for past ice loss. We redact a total volume for both icefields in 2000 of 5351 km³. Despite the wealth of observations used in this assessment, relative volume uncertainties remain elevated.

Supraglacial lake evolution on Tracy and Heilprin Glaciers in northwestern Greenland from 2014 to 2021
Yefan Wang, Shin Sugiyama
Remote Sensing of Environment, 303, 114006, 114006, Elsevier BV, Mar. 2024
Scientific journal

潮位と熱応力に起因する東南極ラングホブデ氷河棚氷の破砕メカニズム
箕輪 昌紘, Evgeny Podolskiy, 杉山 慎
北海道の雪氷, 42, 45, 48, Oct. 2023
Japanese, 31688139

マルチビーム・ソナーによるパタゴニア・グレイ氷河末端の水中観測
杉山 慎, 波多 俊太郎, 森 尚仁, Paul Sandoval, Marius Schaefer
北海道の雪氷, 42, 41, 44, Oct. 2023
Japanese, 27685771

グリーンランド北西部カナック氷河におけるUAVを用いた表面地形測量
鵜飼真汰, 杉山慎, 近藤研
北海道の雪氷, 42, 37, 40, Oct. 2023
Japanese, 27685771

グリーンランド北西部カナック氷河における近年の流動変化
今津拓郎, 杉山慎
北海道の雪氷, 42, 33, 36, Oct. 2023
Japanese, 27685771

グリーンランド北西部カナック氷河における氷レーダー探査
佐藤 健, 杉山 慎
北海道の雪氷, 42, 29, 32, Oct. 2023
Japanese, 27685771

Calving, ice flow, and thickness of outlet glaciers controlled by land-fast sea ice in Lützow-Holm Bay, East Antarctica
Ken Kondo, Shin Sugiyama
Journal of Glaciology, 1, 13, Cambridge University Press (CUP), 14 Aug. 2023
Scientific journal, Abstract

To investigate the mechanisms driving recent changes in outlet glaciers in Antarctica, we measured the glacier front position, flow velocity and surface elevation of five outlet glaciers flowing into Lützow-Holm Bay in East Antarctica. After a steady advance from 2008 to 2015, all the glaciers synchronously retreated by 0.4–6.0 km between 2016 and 2018. The initiation of the retreat coincided with the breakup of land-fast sea ice in Lützow-Holm Bay in 2016, which resulted in the largest sea-ice loss in the region since 1998. Similar flow variations and surface elevation changes were observed near the grounding line of Shirase, Skallen and Telen glaciers. The slowdown in 2011–15 (by 13%) and the speedup in 2016–18 (by 7%) coincided with the respective increase and decrease in surface elevation. Simultaneous retreat and acceleration after the land-fast sea-ice breakup implies that sea ice has a significant influence on glacier dynamics. Thickening/thinning observed near the grounding line was attributed to a reduced/enhanced stretching flow regime during the deceleration/acceleration period. Our results demonstrate that land-fast sea ice affects not only terminus positions, but also the flow speed and ice thickness of the Antarctic glaciers.

Acoustic sensing of glacial discharge in Greenland
Evgeny Podolskiy, Takuro Imazu, Shin Sugiyama
Geophysical Research Letters, 50, e2023GL103235, Apr. 2023, [Peer-reviewed]
English, Scientific journal

Meltwater Discharge From Marine‐Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord
Naoya Kanna, Shin Sugiyama, Takuto Ando, Yefan Wang, Yuta Sakuragi, Toya Hazumi, Kohei Matsuno, Atsushi Yamaguchi, Jun Nishioka, Youhei Yamashita
Global Biogeochemical Cycles, 36, 11, American Geophysical Union (AGU), Nov. 2022, [Peer-reviewed]
English, Scientific journal, 27685771

アザラシ毛皮シールとナイロンシールの滑り抵抗試験
日下 稜, 杉山 慎, 原田 亜紀
北海道の雪氷, 41, 47, 50, Sep. 2022
Japanese

利尻島ヤムナイ沢雪渓における 2021 年現地調査報告
波多 俊太郎, 杉山 慎, 箕輪 昌紘, 日下 稜, 近藤 研, Wang Yefan, 渡邊 果歩
北海道の雪氷, 41, 39, 42, Sep. 2022
Japanese, 27685771

東南極ラングホブデ氷河における底面滑りの直接観測
近藤研, 杉山慎, 箕輪昌紘
北海道の雪氷, 41, 35, 38, Sep. 2022
Japanese, 36716324

グリーンランド北西部カナック氷帽における 2012–2021 年の表面質量収支
渡邊果歩, 近藤研, 杉山慎
北海道の雪氷, 41, 27, 30, Sep. 2022
Japanese, 27685771

南極ラングホブデ氷河における2021/22熱水掘削
杉山慎, 近藤研, 箕輪昌紘
北海道の雪氷, 41, 31, 34, 日本雪氷学会北海道支部, Sep. 2022, [Lead author], [Domestic magazines]
Japanese

Abrupt drainage of Lago Greve, a large proglacial lake in Chilean Patagonia, observed by satellite in 2020
Shuntaro Hata, Shin Sugiyama, Kosuke Heki
Communications Earth and Environment, 3, 1, Springer Science and Business Media LLC, 26 Aug. 2022, [Peer-reviewed]
English, Scientific journal, Abstract

Glacial lakes are increasing in number and extent under a warming climate. Despite demand for lake monitoring and understanding outburst mechanisms, studies of large outburst events are sparse. Here we report an outburst of Lago Greve, a large proglacial lake in Chilean Patagonia. During the event in April–July 2020, the lake level dropped by 18.3 ± 1.2 m and the area decreased by 14.5 ± 0.02 km². The total water discharge was 3.7 ± 0.2 km³, which is one of the largest glacial lake outbursts ever reported in satellite era. Satellite data indicated the collapse of a bump near the lake outlet triggered the event, by initiating erosion of the bank and bed of the outlet stream. Satellite gravimetry captured a signal of the event, although the magnitude of the corresponding mass change was inconsistent with the drained water mass. Our study demonstrated the potential for observing lake outburst using satellite imagery, altimetry, photogrammetry, and gravimetry., 27685669

Effects of the glacial meltwater supply on carbonate chemistry in Bowdoin Fjord, Northwestern Greenland
Takahito Horikawa, Daiki Nomura, Naoya Kanna, Yasushi Fukamachi, Shin Sugiyama
Frontiers in Marine Science, 9, Frontiers Media SA, 22 Jul. 2022, [Peer-reviewed]
Scientific journal, To understand the effects of the glacial meltwater supply on carbonate chemistry and the air–sea CO₂ flux within the fjord, water samples were collected in Bowdoin Fjord in northwestern Greenland for dissolved inorganic carbon (DIC) concentration, total alkalinity (TA), oxygen isotopic ratio (δ¹⁸O), and chlorophyll a concentration analyses in the summers of 2016 and 2017. The partial pressure of CO₂ (pCO₂) in surface water, calculated from DIC and TA, was less than 200 µatm, and was significantly lower than that in the atmosphere (399 ± 3 µatm). Therefore, surface water of the fjord acts as sink for CO₂ in the atmosphere (–4.9 ± 0.7 mmol m^–2 d^–1). To evaluate the effects of freshwater and land-derived substances by glacial meltwater on pCO₂ in the fjord, we calculated the changes of pCO₂ in salinity and carbonate chemistry that would result from the inflow of glacial meltwater into the fjord. The calculated pCO₂ was high near the calving front, where the contribution of glacier meltwater was significant. Examination of the relationship between salinity-normalized DIC and TA, which was considered DIC and TA input from the land, suggested that the land-derived high pCO₂ freshwater affected mainly by the remineralization of the organic matter by bacterial activity was supplied to the Bowdoin Fjord.

Glacier mass change on the Kamchatka Peninsula, Russia, from 2000 to 2016
Shungo Fukumoto, Shin Sugiyama, Shuntaro Hata, Jun Saito, Takayuki Shiraiwa, Humio Mitsudera
Journal of Glaciology, 69, 274, 237, 250, Cambridge University Press (CUP), 04 Jul. 2022, [Peer-reviewed]
English, Scientific journal, Abstract

On the Kamchatka Peninsula in the Russian Far East, 405 glaciers with an estimated total mass of 49 Gt were reported in the 1970s. These have been retreating at an accelerated rate since the start of the 21st century. Because glacier studies in this region are scarce, ice loss and its influence on sea level rise and regional environments is poorly understood. In this study, we analyzed satellite data to quantify glacier mass change from 2000 to 2016 in six major glacier-covered regions on the peninsula. The mean rate of the glacier mass change over the study period was −0.46 ± 0.01 m w.e. a⁻¹(total mass change was −4.9 ± 0.1 Gt, −304.2 ± 9.1 Mt a⁻¹), which is slightly lower than other regions in mid-latitude and subarctic zones. The mass loss accelerated from >−0.33 ± 0.02 m w.e. a⁻¹in the period 2000–2006/2010 to <−1.65 ± 0.12 m w.e. a⁻¹in 2006/2010–2015/16. The increase in mass loss is attributed to a rise in average decadal summer temperatures observed in the region (+0.68°C from 1987–99 to 2000–13). Moreover, a recent trend in Pacific decadal oscillation suggests future acceleration of mass loss due to a decline in winter precipitation., 27685771

Long‐Term Infrasonic Monitoring of Land and Marine‐Terminating Glaciers in Greenland
L. G. Evers, P. S. M. Smets, J. D. Assink, S. Shani‐Kadmiel, K. Kondo, S. Sugiyama
Geophysical Research Letters, 49, 8, American Geophysical Union (AGU), 28 Apr. 2022, [Peer-reviewed]
English, Scientific journal, 27685771

Huge surface landslide swarm induced by the heavy rain falls in 2016 and 2017 summers in NW Greenland
Tatsuya WATANABE, Shintaro YAMASAKI, Shin SUGIYAMA
Journal of the Japan Landslide Society, 59, 2, 50, 59, Japan Landslide Society, 2022, [Peer-reviewed]
Scientific journal

Glacial earthquake-generating iceberg calving in a narwhal summering ground: The loudest underwater sound in the Arctic?
Evgeny A. Podolskiy, Yoshio Murai, Naoya Kanna, Shin Sugiyama
The Journal of the Acoustical Society of America, 151, 1, 6, 16, Acoustical Society of America (ASA), Jan. 2022, [Peer-reviewed]
English, Scientific journal, 27685771

Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia
Shin Sugiyama, Masahiro Minowa, Yasushi Fukamachi, Shuntaro Hata, Yoshihiro Yamamoto, Tobias Sauter, Christoph Schneider, Marius Schaefer
Nature Communications, 12, 1, 6301, Springer Science and Business Media LLC, Nov. 2021, [Peer-reviewed]
English, Scientific journal, Water temperature in glacial lakes affects underwater melting and calving of glaciers terminating in lakes. Despite its importance, seasonal lake temperature variations are poorly understood because taking long-term measurements near the front of calving glaciers is challenging. To investigate the thermal structure and its seasonal variations, we performed year-around temperature and current measurement at depths of 58–392 m in Lago Grey, a 410-m-deep glacial lake in Patagonia. The measurement revealed critical impacts of subglacial discharge on the lake thermal condition. Water below a depth of ~100 m showed the coldest temperature in mid-summer, under the influence of glacial discharge, whereas temperature in the upper layer followed a seasonal variation of air temperature. The boundary of the lower and upper layers was controlled by the depth of a sill which blocks outflow of dense and cold glacial meltwater. Our data implies that subglacial discharge and bathymetry dictate mass loss and the retreat of lake-terminating glaciers. The cold lakewater hinders underwater melting and facilitates formation of a floating terminus., 27685669

Surface Elevation Change of Glaciers Along the Coast of Prudhoe Land, Northwestern Greenland from 1985 to 2018
Yefan Wang, Shin Sugiyama, Anders A. Bjørk
Journal of Geophysical Research: Earth Surface, American Geophysical Union (AGU), 20 Oct. 2021, [Peer-reviewed]
English, Scientific journal

Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica
Masahiro Minowa, Shin Sugiyama, Masato Ito, Shiori Yamane, Shigeru Aoki
Nature Communications, 12, 1, Springer Science and Business Media LLC, Jul. 2021, [Peer-reviewed]
English, Scientific journal, Basal melting of ice shelves is considered to be the principal driver of recent ice mass loss in Antarctica. Nevertheless, in-situ oceanic data covering the extensive areas of a subshelf cavity are sparse. Here we show comprehensive structures of temperature, salinity and current measured in January 2018 through four boreholes drilled at a ~3-km-long ice shelf of Langhovde Glacier in East Antarctica. The measurements were performed in 302–12 m-thick ocean cavity beneath 234–412 m-thick ice shelf. The data indicate that Modified Warm Deep Water is transported into the grounding zone beneath a stratified buoyant plume. Water at the ice-ocean interface was warmer than the in-situ freezing point by 0.65–0.95°C, leading to a mean basal melt rate estimate of 1.42 m a⁻¹. Our measurements indicate the existence of a density-driven water circulation in the cavity beneath the ice shelf of Langhovde Glacier, similar to that proposed for warm-ocean cavities of larger Antarctic ice shelves., 31688139

Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
Evgeny A. Podolskiy, Yoshio Murai, Naoya Kanna, Shin Sugiyama
Nature Communications, 12, 1, Springer Science and Business Media LLC, Jun. 2021, [Peer-reviewed]
English, Scientific journal, Shearing along subduction zones, laboratory experiments on analogue faults, and sliding along glacier beds are all associated with aseismic and co-seismic slip. In this study, an ocean-bottom seismometer is deployed near the terminus of a Greenlandic tidewater glacier, effectively insulating the signal from the extremely noisy surface seismic wavefield. Continuous, tide-modulated tremor related to ice speed is recorded at the bed of the glacier. When noise interference (for example, due to strong winds) is low, the tremor is also confirmed via analysis of seismic waveforms from surface stations. The signal resembles the tectonic tremor commonly observed during slow-earthquake events in subduction zones. We propose that the glacier sliding velocity can be retrieved from the observed seismic noise. Our approach may open new opportunities for monitoring calving-front processes in one of the most difficult-to-access cryospheric environments., 27685771

Ocean-Bottom Seismology of Glacial Earthquakes: The Concept, Lessons Learned, and Mind the Sediments
Evgeny A. Podolskiy, Yoshio Murai, Naoya Kanna, Shin Sugiyama
Seismological Research Letters, Seismological Society of America (SSA), 05 May 2021, [Peer-reviewed]
English, Scientific journal,
About 70% of Earth’s surface is covered by ocean, for which seismic observations are challenging. Seafloor seismology overcame this fundamental difficulty and radically transformed the earth sciences, as it expanded the coverage of seismic networks and revealed otherwise inaccessible features. At the same time, there has been a recent increase in the number of studies on cryoseismology. These have yielded multiple discoveries but are limited primarily to land and ice-surface receivers. Near ice calving fronts, such surface stations are noisy, primarily due to crevassing and wind, are hazardous to maintain, and can be lost due to iceberg calving. To circumvent these issues, we have applied ocean-bottom seismology to the calving front of a tidewater glacier in northwest Greenland. We present details of this experiment, and describe the technical challenges, noise analysis, and examples of recorded data. This includes tide-modulated seismicity with thousands of icequakes per day and the first near-source (∼200–640  m) underwater record of a major kilometer-scale calving event in Greenland, which generated a glacial earthquake that was detectable ∼420  km away. We also identified a decrease in bottom-water temperature, presumably due to modified water stratification driven by extreme Greenland glacial melting, at the end of July 2019. Importantly, we identify glacial sediments as the key reason for the anomalously long (∼9.7  hr) delay in the sensor release from the fjord seafloor. Our study demonstrates a methodology to undertake innovative, interdisciplinary, near-source studies on glacier basal sliding, calving, and marine-mammal vocalizations., 27685771

Frontal ablation and mass loss of the Patagonian icefields
Masahiro Minowa, Marius Schaefer, Shin Sugiyama, Daiki Sakakibara, Pedro Skvarca
Earth and Planetary Science Letters, 561, 116811, 116811, Elsevier BV, May 2021, [Peer-reviewed]
English, Scientific journal, The complex dynamics of calving glaciers is a major uncertainty in projecting global glacial mass loss. We present frontal ablation and ice mass change for the 38 major calving glaciers in the Patagonian icefields based on remote-sensing observations of ice-front positions, surface speeds and elevation changes. The frontal ablation from 2000 to 2019 was -24.1 +/- 1.7 Gt a(-1), which represents 34 +/- 6% of the total ablation of the icefields. The fraction of frontal ablation was close to half in the southern icefield and about one fifth in the northern icefield. The rate of the mass loss from the icefields during the period of study was 15.2 +/- 3.5 Gt a(-1), which is generally explained by surface mass balance but was accelerated as a result of increasing frontal ablation. The frontal ablation and mass change values suggest surface mass balance to be -1.5 +/- 0.9 Gt a(-1) for the northern icefield and +11.5 +/- 2.7 Gt a(-1) for the southern icefield during this period. Our study demonstrates that a strong increase in frontal ablation at several glaciers drives the mass loss in the southern icefield, whereas increasingly negative surface mass balance drives the mass loss in the northern icefield. (C) 2021 Elsevier B.V. All rights reserved., 27685669

Co-seismic eruption and intermittent turbulence of a subglacial discharge plume revealed by continuous subsurface observations in Greenland
Evgeny A. Podolskiy, Naoya Kanna, Shin Sugiyama
Communications Earth & Environment, 2, 1, Springer Science and Business Media LLC, 25 Mar. 2021, [Peer-reviewed]
English, Scientific journal, In the Arctic, subglacial discharge plumes have been recently recognised as a key driver of fjord-scale circulation. However, owing to the danger that accompanies prolonged observations at plumes, no time-series data are available. Here, we present results showing the chaotic and irregular dynamics of a plume revealed by continuous subsurface monitoring directly on the calving front of a Greenlandic glacier. We found intense fluctuations in the current and scalars (temperature and salinity), recognised shallow and deep tidal modulation and anomalies due to co-seismic drainage of an ice-dammed lake via the plume, and observed rapid and marked changes in stratification. Our analysis uncovers energy cascade intermittency with coherent structures, corresponding to upwelling pulses of warm water. Prior to our research, in situ evidence of time-variable plume dynamics was absent and limited to snapshots, therefore, our study and approach will enable researchers to transition from an episodic view of a plume to a continuously updated image., 27685771

Studies on Atmosphere, Snow/Ice, and Glacial Microbes on Greenland Ice Sheet by SIGMA and relevant projects: ─A linkage to the ArCS II Project─
AOKI Teruo, MATOBA Sumito, NIWANO Masashi, KUCHIKI Katsuyuki, TANIKAWA Tomonori, TAKEUCHI Nozomu, YAMAGUCHI Satoru, MOTOYAMA Hideaki, FUJITA Koji, YAMASAKI Tetsuhide, IIZUKA Yoshinori, HORI Masahiro, SHIMADA Rigen, UETAKE Jun, NAGATSUKA Naoko, ONUMA Yukihiko, HASHIMOTO Akihiro, ISHIMOTO Hiroshi, TANAKA Taichu Yasumich, OSHIMA Naga, KAJINO Mizuo, ADACHI Kouji, KUROSAKI Yutaka, SUGIYAMA Shin, TSUTAKI Shun, GOTO-AZUMA Kumiko, HACHIKUBO Akihiro, KAWAKAMI Kaoru, KINASE Takeshi
Journal of the Japanese Society of Snow and Ice, 83, 2, 169, 191, The Japanese Society of Snow and Ice, Mar. 2021
Japanese, Currently occurring rapid warming in the Arctic could affect global environmental changes through sea level rise and remote atmospheric effect. The surface melting of the Greenland Ice Sheet (GrIS) involves various uncertainties, which are issues to be elucidated for accurate climate projections. To clarify how the atmosphere, snow/ice, and glacial microbes in the GrIS affect the ice sheet change under global warming, the SIGMA and SIGMA-II projects were conducted from FY2011 to FY2019. In parallel, big Arctic research projects such as GRENE and ArCS were also done, which accelerated the Japanese Greenland researches. This paper describes the research results of the SIGMA and SIGMA-II projects as well as the related research projects in the categories of (1) in-situ observations of the atmosphere, snow/ice, and glacial microbes, (2) ice core drilling, (3) satellite observation, and (4) numerical modeling. Furthermore, we discuss current issues in these studies, a linkage to the Cryosphere subject of recently launched ArCS II Project, and the importance of capacity building.

Floods of glacial streams in Qaanaaq, northwestern Greenland
Shin Sugiyama, Ken Kondo
Seppyo, 83, 2, 193, 204, Mar. 2021, [Peer-reviewed], [Lead author]
Scientific journal, 27685771

Flood events caused by discharge from Qaanaaq Glacier, northwestern Greenland
Ken Kondo, Shin Sugiyama, Daiki Sakakibara, Shungo Fukumoto
Journal of Glaciology, 1, 11, Cambridge University Press (CUP), 17 Feb. 2021, [Peer-reviewed]
English, Scientific journal,
As a result of climate warming, glacial meltwater discharge has been increasing in Greenland. During the summers of 2015 and 2016, there were rapid increases in discharge from Qaanaaq Glacier in northwestern Greenland. These discharges resulted in floods that destroyed the road linking the settlement of Qaanaaq to Qaanaaq Airport. Field measurements were performed and a numerical model of glacier runoff was developed to quantify these discharges. The high discharge associated with the 2015 flood, estimated at 9.1 m³ s⁻¹ (hourly mean), resulted from intensive glacier melting due to warm air temperature and strong winds, while the high discharge associated with the 2016 flood resulted from heavy rainfall (90 mm d⁻¹) that led to a peak discharge estimated at 19.9 m³ s⁻¹. The developed model, when used to investigate future glacier runoff under warming conditions, revealed a nonlinear increase in glacial melt with increasing temperature. Additionally, the model forecasted a threefold increase in total summer discharge, owing to a 4 °C rise in temperature. Thus, this study quantified the impact of a changing climate on glacier runoff, which gives insight into future risks of flood hazards along the coast of Greenland., 27685771

Thinning leads to calving-style changes at Bowdoin Glacier, Greenland
Eef C. H. van Dongen, Guillaume Jouvet, Shin Sugiyama, Evgeny A. Podolskiy, Martin Funk, Douglas I. Benn, Fabian Lindner, Andreas Bauder, Julien Seguinot, Silvan Leinss, Fabian Walter
The Cryosphere, 15, 2, 485, 500, Copernicus GmbH, 02 Feb. 2021, [Peer-reviewed]
English, Scientific journal, Abstract. Ice mass loss from the Greenland ice sheet is the largest single contributor to sea level rise in the 21st century. The mass loss rate has accelerated in recent decades mainly due to thinning and retreat of its outlet glaciers. The diverse calving mechanisms responsible for tidewater glacier retreat are not fully understood yet. Since a tidewater glacier’s sensitivity to external forcings depends on its calving style, detailed insight into calving processes is necessary to improve projections of ice sheet mass loss by calving. As tidewater glaciers are mostly thinning, their calving styles are expected to change. Here, we study calving behaviour changes under a thinning regime at Bowdoin Glacier, north-western Greenland, by combining field and remote-sensing data from 2015 to 2019. Previous studies showed that major calving events in 2015 and 2017 were driven by hydro-fracturing and melt-undercutting. New observations from uncrewed aerial vehicle (UAV) imagery and a GPS network installed at the calving front in 2019 suggest ungrounding and buoyant calving have recently occurred as they show (1) increasing tidal modulation of vertical motion compared to previous years, (2) absence of a surface crevasse prior to calving, and (3) uplift and horizontal surface compression prior to calving. Furthermore, an inventory of calving events from 2015 to 2019 based on satellite imagery provides additional support for a change towards buoyant calving since it shows an increasing occurrence of calving events outside of the melt season. The observed change in calving style could lead to a possible retreat of the terminus, which has been stable since 2013. We therefore highlight the need for high-resolution monitoring to detect changing calving styles and numerical models that cover the full spectrum of calving mechanisms to improve projections of ice sheet mass loss by calving., 26019601

Changes in the Ice-Front Position and Surface Elevation of Glaciar Pío XI, an Advancing Calving Glacier in the Southern Patagonia Icefield, From 2000–2018
Shuntaro Hata, Shin Sugiyama
Frontiers in Earth Science, 8, 576044, Frontiers Media SA, 21 Jan. 2021, [Peer-reviewed], [Last author]
English, Scientific journal, Glaciar Pío XI has advanced and thickened over the past several decades in contrast to the generally retreating and thinning trends seen in other glaciers in the Southern Patagonia Icefield (SPI). To quantify recent changes in ice-front positions and glacier surface elevation over the ablation area of Glaciar Pío XI, we analyzed satellite data acquired from 2000 to 2018. Two major glacier termini, and most of the small outlet glaciers, showed advancing trends, including the largest advance (1,400 m), observed at the southern terminus during the study period. Surface elevation increased by 37.3 ± 0.4 m as a mean over the study area, and the rate of the increase accelerated by 135 ± 10% from Period 1 (2000–2007) to Period 2 (2007–2017/18). Elevation change during Period 1 was only slightly positive except for extraordinary thickening (∼20 m a⁻¹) observed near the southern terminus and one of the outlet glacier fronts, whereas significant thickening (∼2.7 m a⁻¹) occurred over the entire ablation area during Period 2. Satellite imagery showed an emergence of sedimentary mounds in front of the southern terminus, suggesting that reduction in frontal ablation and increasingly compressive flow regime are the main drivers of the recent rapid thickening and advance. Most likely, the influence of the sediment deposition on the southern terminus subsequently propagated to the northern terminus and upper reaches of the glacier. The rate of ice mass increase during the study period was 0.48 ± 0.03 Gt a⁻¹, which corresponds to 4% of the total mass loss from the SPI from 2000 to 2015/16., 27685669

Review of the current polar ice sheet surface mass balance and its modelling: the 2020 summer edition
庭野匡思, 青木輝夫, 青木輝夫, 橋本明弘, 大島長, 梶野瑞王, 大沼友貴彦, 藤田耕史, 山口悟, 島田利元, 竹内望, 津滝俊, 津滝俊, 本山秀明, 石井正好, 杉山慎, 平沢尚彦, 阿部彩子, 阿部彩子
雪氷, 83, 1, 2021

Hot-water drilling for exploration of the A ntarctic subglacial environments
Shin Sugiyama, Masahiro Minowa, Masato Ito, Shiori Yamane
Seppyo, 83, 1, 13, 25, Jan. 2021, [Peer-reviewed], [Lead author]
Japanese, Scientific journal, 9968751

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, Elsevier BV, Dec. 2020, [Peer-reviewed], [Lead author]
English, Scientific journal, 27685771

Greenland liquid water discharge from 1958 through 2019
Kenneth D. Mankoff, Brice Noël, Xavier Fettweis, Andreas P. Ahlstrøm, William Colgan, Ken Kondo, Kirsty Langley, Shin Sugiyama, Dirk van As, Robert S. Fausto
Earth System Science Data, 12, 4, 2811, 2841, Copernicus GmbH, 14 Nov. 2020, [Peer-reviewed]
English, Scientific journal, Abstract. Greenland runoff, from ice mass loss and increasing rainfall, is increasing. That runoff, as discharge, impacts the physical, chemical, and biological properties of the adjacent fjords. However, where and when the discharge occurs is not readily available in an open database. Here we provide data sets of high-resolution Greenland hydrologic outlets, basins, and streams, as well as a daily 1958 through 2019 time series of Greenland liquid water discharge for each outlet. The data include 24 507 ice marginal outlets and upstream basins and 29 635 land coast outlets and upstream basins, derived from the 100 m ArcticDEM and 150 m BedMachine. At each outlet there are daily discharge data for 22 645 d – ice sheet runoff routed subglacially to ice margin outlets and land runoff routed to coast outlets – from two regional climate models (RCMs; MAR and RACMO).
Our sensitivity study of how outlet location changes for every inland cell based on subglacial routing assumptions shows that most inland cells where runoff occurs are not highly sensitive to those routing assumptions, and outflow location does not move far. We compare RCM results with 10 gauges from streams with discharge rates spanning 4 orders of magnitude. Results show that for daily discharge at the individual basin scale the
5 % to 95 % prediction interval between modeled discharge and observations generally falls within plus or minus a factor of 5 (half an order of magnitude, or +500 %/-80 %). Results from this study are available at
https://doi.org/10.22008/promice/freshwater (Mankoff, 2020a) and code is available at http://github.com/mankoff/freshwater (last access: 6 November 2020) (Mankoff, 2020b)., 26019601

Iron supply by subglacial discharge into a fjord near the front of a marine‐terminating glacier in northwestern Greenland
N. Kanna, S. Sugiyama, Y. Fukamachi, D. Nomura, J. Nishioka
Global Biogeochemical Cyscles, 34, 10, e2020GB006567, American Geophysical Union, 28 Sep. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal, 27685771

Impacts of meltwater discharge from marine-terminating glaciers on the protist community in Inglefield Bredning, northwestern Greenland
K Matsuno, N Kanna, S Sugiyama, A Yamaguchi, EJ Yang
Marine Ecology Progress Series, 642, 55, 65, Inter-Research Science Center, 28 May 2020, [Peer-reviewed]
English, Scientific journal, To evaluate the effects of meltwater discharge from marine-terminating glaciers on a fjord protist community in northwestern Greenland during summer, we investigated the distribution, abundance and biomass of the protist community and their relationships with hydrographic parameters. In the standing stock of protists, dinoflagellates (46.4%) and oligotrich ciliates (39.5%) were dominant throughout the study region. With respect to vertical distribution, oligotrich ciliates were abundant in the surface layer, mainly due to suitable food conditions (abundance of diatom and nanoflagellates). Near glaciers, relatively high chlorophyll a (chl a) concentrations were found in the subsurface layers associated with the low-temperature, high-turbidity and slightly high nutrient levels, indicating that the nutrient inputs from the upwelling glacial meltwater plume increased primary production. Large-sized Protoperidium spp. were found only at stations near glaciers where nutrients were abundant, and heterotrophic dinoflagellates showed strong relationships with nanoflagellates. These findings suggest that the upwelling associated with subglacial meltwater discharge can stimulate nanoflagellate production, resulting in increases in ciliate and heterotrophic dinoflagellate production., 26019601

Soundscape of a narwhal summering ground in a glacier fjord (Inglefield Bredning, Greenland)
Podolskiy, J., S. Sugiyama
Journal of Geophysical Research Oceans, 125, e2020JC016116, May 2020, [Peer-reviewed]
Scientific journal, 26019601

Water mass structure and the effect of subglacial discharge in Bowdoin Fjord, northwestern Greenland
Ohashi, Y., S. Aoki, Y. Matsumura, S. Sugiyama, N. Kanna, D. Sakakibara
Ocean Science, 16, 3, 545, 564, Apr. 2020, [Peer-reviewed]
English, Scientific journal, © Author(s) 2020. Subglacial discharge has significant impacts on water circulation, material transport, and biological productivity in proglacial fjords of Greenland. To help clarify the fjord water properties and the effect of subglacial discharge, we investigated the properties of vertical water mass profiles of Bowdoin Fjord in northwestern Greenland based on summer hydrographic observations, including turbidity, in 2014 and 2016. We estimated the fraction of subglacial discharge from the observational data and interpreted the observed differences in subglacial plume behavior between two summer seasons with the numerical model results. At a depth of 15-40 m, where the most turbid water was observed, the maximum subglacial discharge fractions near the ice front were estimated to be &tild; 6 % in 2014 and &tild; 4 % in 2016. The higher discharge fraction in 2014 was likely due to stronger stratification, as suggested by the numerical experiments performed with different initial stratifications. Turbidity near the surface was higher in 2016 than in 2014, suggesting a stronger influence of turbid subglacial discharge. The higher turbidity in 2016 could primarily be attributed to a greater amount of subglacial discharge, as inferred from the numerical experiments forced by different amounts of discharge. This study suggests that both fjord stratification and the amount of discharge are important factors in controlling the vertical distribution of freshwater outflow., 26019601

Through the Japanese field research in Greenland: A changing natural environment and its impact on human society　　　　　　　　　　　　　　　
Sugiyama, S.
Polar Record, 1, 6, Apr. 2020, [Peer-reviewed], [Lead author]
English, Scientific journal

Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland
J. Seguinot, M. Funk, A. Bauder, C. Senn, S. Sugiyama
Frontiers in Earth Science, 8, 65, Mar. 2020, [Peer-reviewed]
English, Scientific journal

Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland
Van Dongen, E, G. Jouvet, A. Walter, J. Todd, T. Zwinger, I. Asaji, S. Sugiyama, F. Walter, M. Funk
Journal of Glaciology, 66, 255, 113, 123, Feb. 2020, [Peer-reviewed]
English, Scientific journal

Seasonal ice speed variations in 10 marine-terminating outlet glaciers along the coast of Prudhoe Land, northwestern Greenland
Sakakibara, D, S. Sugiyama
Journal of Glaciology, 66, 255, 25, 34, Feb. 2020, [Peer-reviewed]
English, Scientific journal

Contrasting assemblages of seabirds in the subglacial meltwater plume and oceanic water of Bowdoin Fjord, northwestern Greenland
Nishizawa, B, N. Kanna, Y. Abe, Y. Ohashi, D. Sakakibara, I. Asaji, S. Sugiyama, A. Yamaguchi, Y. Watanuki
ICES Journal of Marine Science, fsz213, Dec. 2019, [Peer-reviewed]
English, Scientific journal

Contrasting thinning patterns between lake- and land-terminating glaciers in the Bhutanese Himalaya
Tsutaki, Shun, Fujita, Koji, Nuimura, Takayuki, Sakai, Akiko, Sugiyama, Shin, Komori, Jiro, Tshering, Phuntsho
CRYOSPHERE, 13, 10, 2733, 2750, COPERNICUS GESELLSCHAFT MBH, Oct. 2019, [Peer-reviewed]
English, Scientific journal, Despite the importance of glacial lake development in ice dynamics and glacier thinning, in situ and satellite-based measurements from lake-terminating glaciers are sparse in the Bhutanese Himalaya, where a number of proglacial lakes exist. We acquired in situ and satellite-based observations across lake- and land-terminating debris-covered glaciers in the Lunana region, Bhutanese Himalaya. A repeated differential global positioning system survey reveals that thickness change of the debris-covered ablation area of the lake-terminating Lugge Glacier (-4.67 +/- 0.07 m a(-1)) is more than 3 times more negative than that of the land-terminating Thorthormi Glacier (-1 40 +/- 0.07 m a(-1)) for the 2004-2011 period. The surface flow velocities decrease down-glacier along Thorthormi Glacier, whereas they increase from the upper part of the ablation area to the terminus of Lugge Glacier. Numerical experiments using a two-dimensional ice flow model demonstrate that the rapid thinning of Lugge Glacier is driven by both a negative surface mass balance and dynamically induced ice thinning. However, the thinning of Thorthormi Glacier is minimised by a longitudinally compressive flow regime. Multiple supraglacial ponds on Thorthormi Glacier have been expanding since 2000 and have merged into a single proglacial lake, with the glacier terminus detaching from its terminal moraine in 2011. Numerical experiments suggest that the thinning of Thorthormi Glacier will accelerate with continued proglacial lake development.

Field measurements and numerical experiments on ice flow velocity of Qaanaaq Ice Cap, northwestern Greenland
Kondo, K, D. Sakakibara, S. Tsutaki, S. Sugiyama
Annual Report on Snow and Ice Studies in Hokkaido, 38, 105, 108, Sep. 2019
Japanese

Recent variation in Ice Speed and Ice-front Position of Pio XI Glacier, Southern Patagonia Icefield
Hata, S, S. Sugiyama, M. Furuya
Annual Report on Snow and Ice Studies in Hokkaido, 38, 93, 96, Sep. 2019
Japanese

Surface elevation change of glaciers in Kronotsuky Peninsula, Kamchatka Peninsula, Russia
Fukumoto, S, S. Hata, J. Saito, S. Sugiyama
Annual Report on Snow and Ice Studies in Hokkaido, 38, 31, 34, Sep. 2019
Japanese

Long-term Measurement of Temperature, Salinity and Ocean Current in the Bowdoin Fjord in northwestern Greenland
Fujishi, Y, Y. Fukamachi, N. Kanna, S. Sugiyama
Annual Report on Snow and Ice Studies in Hokkaido, 38, 15, 18, Sep. 2019
Japanese

Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica
Minowa, M, E. A. Podolskiy, S. Sugiyama
Annals of Glaciology, 60, 79, 57, 67, CAMBRIDGE UNIV PRESS, Jun. 2019, [Peer-reviewed]
English, Scientific journal, We recorded the ice motion and icequakes on the floating part of Langhovde Glacier in East Antarctica to better understand the dynamic behavior of ice shelves and floating tongues. Diurnal and semi-diurnal variations in ice motion and seismicity were simultaneously observed at all four global navigation satellite system and three seismic stations over 2 weeks. The short-term along-flow ice motion is explained by the elastic response of the glacier to ocean tide-induced hydrostatic stress variations, which decayed at a rate of 0.8 km(-1) toward the grounding line. We observed a large number of icequakes during mid-rising and high tides that covered a broad frequency range and formed two major groups of events centered at 10 and 120 Hz, respectively. The hourly occurrence rates were similar to 500 events h(-1), with the observed seismicity consistent with fracture due to floating tongue bending. We also observed minor secondary peaks at high ice speeds, which could reflect surface cracking due to stretching or basal friction. Our observation demonstrates that tidal-modulation was the main factor to fracture the floating tongue of Langhovde Glacier.

Calving flux estimation from tsunami waves
Minowa, M, E. A. Podolskiy, G. Jouvet, Y. Weidmann, D. Sakakibara, S. Tsutaki, E. Genco, S. Sugiyama
Earth and Planetary Science Letters, 515, 283, 290, ELSEVIER, Jun. 2019, [Peer-reviewed]
English, Scientific journal, Measuring glacier calving magnitude, frequency and location in high temporal resolution is necessary to understand mass loss mechanisms of ocean-terminating glaciers. We utilized calving-generated tsunami signals recorded with a pressure sensor for estimating the calving flux of Bowdoin Glacier in northwestern Greenland. We find a relationship between calving ice volume and wave amplitude. This relationship was used to compute calving flux variation. The calving flux showed large spatial and temporal fluctuations in July 2015 and in July 2016, with a mean flux of 2.3 +/- 0.15 x 10(5) m(3) d(-1). Calving flux was greater during periods of fast ice flow, high air temperature, and at low/falling tide, indicating the importance of increased longitudinal strain due to glacier acceleration and/or submarine melting at the calving front. Long-term measurements with the method introduced here are promising for understanding the complex interplay of ice dynamics, melting and calving at glacier fronts. (C) 2019 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Response of the flow dynamics of Bowdoin Glacier, northwestern Greenland, to basal lubrication and tidal forcing
Seddik H, Greve R, Sakakibara D, Tsutaki S, Minowa M, Sugiyama S
Journal of Glaciology, 65, 250, 225, 238, CAMBRIDGE UNIV PRESS, Mar. 2019, [Peer-reviewed]
English, Scientific journal, We use the full-Stokes model Elmer/Ice to investigate the present dynamics of Bowdoin Glacier, a marine-terminating outlet glacier in northwestern Greenland. Short-term speed variations of the glacier were observed, correlating with air temperature and precipitation, and with the semi-diurnal ocean tides. We use a control inverse method to determine the distribution of basal friction. This reveals that most of the glacier area is characterized by near-plug-flow conditions, while some sticky spots are also identified. We then conduct experiments to test the sensitivity of the glacier flow to basal lubrication and tidal forcing at the calving front. Reduction of the basal drag by 10-40% produces speed-ups that agree approximately with the observed range of speed-ups that result from warm weather and precipitation events. In agreement with the observations, tidal forcing and surface speed near the calving front are found to be in anti-phase (high tide corresponds to low speed, and vice versa). However, the amplitude of the semi-diurnal variability is underpredicted by a factor similar to 3, which is likely related to either inaccuracies in the surface and bedrock topographies or mechanical weakening due to crevassing.

Underwater Ice Terrace Observed at the Front of Glaciar Grey, a Freshwater Calving Glacier in Patagonia
Sugiyama, S, M. Minowa, M. Schaefer
Geophysical Research Letters, 46, 5, 2602, 2609, AMER GEOPHYSICAL UNION, Feb. 2019, [Peer-reviewed]
English, Scientific journal, Underwater ice geometry at the front of calving glaciers provides crucial information for calving and underwater melting. In this study, we present ice geometry captured by operating a side-scanning sonar near the front of Glaciar Grey, a freshwater calving glacier in Patagonia. The observations revealed ice projecting into the lake with a substantially different structure from that of known tidewater glaciers. Terrace-like ice structures were found at several tens of meters below the water surface and extended up to 100m from the aerial ice front. The structure depicted by the sonar was confirmed when the ice front was exposed by flotation during a major calving event. We infer that buoyant force acting on the submerged ice terrace acted as a driver of the calving event. Our study demonstrates the importance of the underwater ice geometry, which affects sizable calving at the front of freshwater calving glaciers.Plain Language Summary Glaciers terminating in lakes and the ocean are in general retreating more rapidly than glaciers on land. This is because such glaciers lose ice by discharging icebergs and melting in water. The shape of the submerged part of the ice front provides important information for understanding iceberg production and melting, but measurements near the glacier front are difficult to obtain. In this study, we used a side-scanning sonar to visualize underwater ice of a lake terminating glacier in Patagonia. The observations revealed ice jutting into the lake, forming terrace-like structures several tens of meters below the water surface. The structure was significantly different from that of ocean terminating glaciers. The observation was confirmed when the ice front was detached from the glacier and exposed by flotation. Our study demonstrates that buoyant force acting on the ice terrace plays a key role in the production of large icebergs at the front of freshwater calving glaciers.

Ocean measurement near the fronts of marine-terminating glaciers in Northwestern Greenland　　　　　　　　　　　　　　　
Kanna, N, S. Sugiyama, T. Ando, I. Asaji, Y. Fujishi
Proceedings of 34th International Symposium on the Okhotsk Sea and Polar Oceans, 254, 254, 2019
English

Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula
Sugiyama, S., Navarro, F.J., Sawagaki, T., Minowa, M., Segawa, T., Onuma, Y., Otero, J., Vasilenko, E.V.
Journal of Glaciology, 65, 252, 689, 699, 2019, [Peer-reviewed]
English, Scientific journal

Surface zooplankton size and taxonomic composition in Bowdoin Fjord, north-western Greenland: A comparison of ZooScan, OPC and microscopic analyses
Naito, A, Y. Abe, K. Matsuno, B. Nishizawa, N. Kanna, S. Sugiyama, A. Yamaguchi
Polar Science, Jan. 2019, [Peer-reviewed]
English, Scientific journal

北極と南極における近年の氷河氷床変動　　　　　　　　　　　　　　　
杉山 慎
極地, 54, 2, 16, 19, Sep. 2018, [Invited]
Japanese

Influence of ocean bed geometry on the front variations of Bowdoin Glacier, northwestern Greenland
Izumi Asaji, Daiki Sakakibara, Shin Sugiyama, Shintaro Yamasaki
Annual Report on Snow and Ice Studies in Hokkaido, 37, 119, 122, Sep. 2018
Japanese

Surface velocity distribution at Pio XI glacier, Southern Patag onia Icefield
Shuntaro Hata, Shin Sug iyama, Masato Furuya
Annual Report on Snow and Ice Studies in Hokkaido, 37, 111, 114, Sep. 2018
Japanese

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, Sep. 2018
Japanese

Subshelf environment of Langhovde Glacier, Antarctica
Shiori Yamane, Shin Sugiyama, Masahiro Minowa, Masato Ito
Annual Report on Snow and Ice Studies in Hokkaido, 37, 75, 78, Sep. 2018
Japanese

The spatial distribution of annual dust flux on glacier surface at Qaanaaq ice cap, northwestern Greenland in 2016/17
Ryo Hazuki, Yutaka Kurosaki, Sumito Matoba, Shin Sugiyama
Annual Report on Snow and Ice Studies in Hokkaido, 37, 23, 26, Sep. 2018
Japanese

Hot-water drilling at Langhovde Glacier in Antarctica
Shin Sugiyama, Masahiro Minowa, Masato Ito, Shiori Yamane
Annual Report on Snow and Ice Studies in Hokkaido, 37, 7, 10, Sep. 2018
Japanese

Bipolar dispersal of red-snow algae
T. Segawa, R. Matsuzaki, N. Takeuchi, A. Akiyoshi, F. Navarro, S. Sugiyama, T. Yonezawa, H. Mori
Nature Communications, 9, 1, 3094, 3094, Aug. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal, Red-snow algae are red-pigmented unicellular algae that appear seasonally on the surface of thawing snow worldwide. Here, we analyse the distribution patterns of snow algae sampled from glaciers and snow patches in the Arctic and Antarctica based on nuclear ITS2 sequences, which evolve rapidly. The number of phylotypes is limited in both polar regions, and most are specific to either the Arctic or Antarctica. However, the bipolar phylotypes account for the largest share (37.3%) of all sequences, suggesting that red-algal blooms in polar regions may comprise mainly cosmopolitan phylotypes but also include endemic organisms, which are distributed either in the Arctic or Antarctica.

Short-lived ice speed-up and plume water flow captured by VTOL UAV give insights into subglacial hydrological system of Bowdoin Glacier
Jouvet, G, Y. Weidmann, M. Kneib, M. Detert, J. Seguinot, D. Sakakibara, S. Sugiyama
Remote Sensing of Environment, 217, 389, 399, Aug. 2018, [Peer-reviewed]
English, Scientific journal

Glacier calving observed with time-lapse imagery and tsunami waves at Glaciar Perito Moreno, Patagonia
Masahiro Minowa, Evgeny A. Podolskiy, Shin Sugiyama, Daiki Sakakibara, Pedro Skvarca
Journal of Glaciology, 64, 245, 362, 376, Cambridge University Press, 01 Jun. 2018, [Peer-reviewed]
English, Scientific journal, Calving plays a key role in the recent rapid retreat of glaciers around the world. However, many processes related to calving are poorly understood since direct observations are scarce and challenging to obtain. When calving occurs at a glacier front, surface-water waves arise over the ocean or a lake in front of glaciers. To study calving processes from these surface waves, we performed field observations at Glaciar Perito Moreno, Patagonia. We synchronized time-lapse photography and surface waves record to confirm that glacier calving produces distinct waves compared with local noise. A total of 1074 calving events were observed over the course of 39 d. During austral summer, calving occurred twice more frequently than in spring. The cumulative distribution of calving-interevent time interval followed exponential model, implying random occurrence of events in time. We further investigated wave properties and found that source-to-sensor distance can be estimated from wave dispersion within ∼20% error. We also found that waves produced by different calving types showed similar spectra in the same frequency range between 0.05-0.2 Hz, and that the amplitude of surface waves increased with the size of calving. This study demonstrates the potential of surface-wave monitoring for understanding calving processes.

Upwelling of Macronutrients and Dissolved Inorganic Carbon by a Subglacial Freshwater Driven Plume in Bowdoin Fjord, Northwestern Greenland
Naoya Kanna, Shin Sugiyama, Yoshihiko Ohashi, Daiki Sakakibara, Yasushi Fukamachi, Daiki Nomura
Journal of Geophysical Research: Biogeosciences, 123, 5, 1666, 1682, American Geophysical Union (AGU), May 2018, [Peer-reviewed]
English, Scientific journal

Ice front and flow speed variations of marine-terminating outlet glaciers along the coast of Prudhoe Land, northwestern Greenland
Daiki Sakakibara, Shin Sugiyama
Journal of Glaciology, 64, 244, 300, 310, Cambridge University Press, 01 Apr. 2018, [Peer-reviewed]
English, Scientific journal, Satellite images were analyzed to measure the frontal positions and ice speeds of 19 marine-terminating outlet glaciers along the coast of Prudhoe Land, northwestern Greenland from 1987 to 2014. All the studied glaciers retreated over the study period at a rate of between 12 and 200 m a-1, with a median (mean) retreat rate of 30 (40) m a-1. The glacier retreat began in the year ~2000, which coincided with an increase in summer mean air temperature from 1.4 to 5.5 °C between 1996 and 2000 in this region. Ice speed near the front of the studied glaciers ranged between 20 and 1740 m a-1 in 2014, and many of them accelerated in the early 2000s. In general, the faster retreat was observed at the glaciers that experienced greater acceleration, as represented by Tracy Glacier, which experienced a retreat of 200 m a-1 and a velocity increase of 930 m a-1 during the study period. A possible interpretation of this observation is that flow acceleration induced dynamic thinning near the termini, resulting in enhanced calving and rapid retreat of the studied glaciers. We hypothesize that atmospheric warming conditions in the late 1990s triggered glacier retreat in northwestern Greenland since 2000.

南極氷床 －その変動と海洋との相互作用―　　　　　　　　　　　　　　　
杉山 慎
低温科学, 76, 169, 178, Mar. 2018, [Invited]
Japanese

Field Activities at the SIGMA-A site, northwestern Greenland Ice Sheet in 2017
Matoba, S, M. Niwano, T. Tanikawa, Y. Iizuka, T. Yamasaki, Y. Kurosaki, T. Aoki, A. Hashimoto, M. Hosaka, S. Sugiyama
Bulletin of Glaciological Research, 36, 0, 15, 22, Japanese Society of Snow and Ice, 2018, [Peer-reviewed]
Scientific journal

Surface elevations on Qaanaaq and Bowdoin Glaciers in northwestern Greenland as measured by a kinematic GPS survey from 2012–2016
Tsutaki, S, S. Sugiyama, D. Sakakibara
Polar Data Journal, 1, 1, 16, Oct. 2017, [Peer-reviewed]
English, Scientific journal

Coastal environment change and its impact on human life in Greenland
Shin Sugiyama
Seppyo, 79, 5, 443, 449, 日本雪氷学会, Sep. 2017, [Peer-reviewed], [Invited], [Lead author]
Japanese, Scientific journal, 26019601

南パタゴニア氷原・グレイ氷河の末端変動メカニズム
山本淳博, 箕輪昌紘, 杉山慎
北海道の雪氷, 36, 53, 56, Sep. 2017
Japanese

Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics
Hakime Seddik, Ralf Greve, Thomas Zwinger, Shin Sugiyama
CRYOSPHERE, 11, 5, 2213, 2229, COPERNICUS GESELLSCHAFT MBH, Sep. 2017, [Peer-reviewed]
English, Scientific journal, A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constant-climate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is similar to 30% larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance.

氷の島グリーンランドが氷を失っています
杉山 慎
月刊地理, 62, 7, 20, 27, 古今書院, Jul. 2017
Japanese

Surface mass balance, ice velocity and near-surface ice temperature on Qaanaaq Ice Cap, northwestern Greenland, from 2012 to 2016
Shun Tsutaki, Shin Sugiyama, Daiki Sakakibara, Teruo Aoki, Masashi Niwano
Annals of Glaciology, 58, 75, 181, 192, Cambridge University Press, 01 Jul. 2017, [Peer-reviewed]
English, Scientific journal, To better understand the processes controlling recent mass loss of peripheral glaciers and ice caps in northwestern Greenland, we measured surface mass balance (SMB), ice velocity and near-surface ice temperature on Qaanaaq Ice Cap in the summers of 2012-16. The measurements were performed along a survey route spanning the terminus of an outlet glacier to the upper reaches (243-968 m a.s.l.). The ice-cap-wide SMB ranged from -1.10 ± 0.29 to -0.13 ± 0.26 m w.e. a-1 for the years from 2012/13 to 2015/16. Mass balance showed substantially large fluctuations over the study period under the influence of summer temperature and snow accumulation. Ice velocity showed seasonal speedup only in the summer of 2012, suggesting an extraordinary amount of meltwater penetrated to the bed and enhanced basal ice motion. Ice temperature at a depth of 13 m was -8.0°C at 944 m a.s.l., which was 2.5°C warmer than that at 243 m a.s.l., suggesting that ice temperature in the upper reaches was elevated by refreezing and percolation of meltwater. Our study provided in situ data from a relatively unstudied region in Greenland, and demonstrated the importance of continued monitoring of these processes for longer timespans in the future.

Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
Guillaume Jouvet, Yvo Weidmann, Julien Seguinot, Martin Funk, Takahiro Abe, Daiki Sakakibara, Hakime Seddik, Shin Sugiyama
CRYOSPHERE, 11, 2, 911, 921, COPERNICUS GESELLSCHAFT MBH, Apr. 2017, [Peer-reviewed]
English, Scientific journal, In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immediately before and after the initiation of a large fracture, which induced a major calving event. A detailed analysis of the strain rate field allows us to accurately map the path taken by the opening crack. Modelling results reveal (i) that the crack was more than half-thickness deep, filled with water and getting irreversibly deeper when it was captured by the UAV and (ii) that the crack initiated in an area of high horizontal shear caused by a local basal bump immediately behind the current calving front. The asymmetry of the bed at the front explains the systematic calving pattern observed in May and July-August 2015. As a corollary, we infer that the calving front of the Bowdoin Glacier is currently stabilized by this bedrock bump and might enter into an unstable mode and retreat rapidly if the glacier keeps thinning in the coming years. Beyond this outcome, our study demonstrates that the combination of UAV photogrammetry and ice flow modelling is a promising tool to horizontally and vertically track the propagation of fractures responsible for large calving events.

グリーンランド北西部Bowdoin 氷河における末端位置の変動と海底地形の関係
浅地泉, 榊原大貴, 山崎新太郎, 杉山慎
北海道の雪氷, 36, 49, 52, Mar. 2017
Japanese

Numerical Weather Prediction System based on JMA-NHM for Field Observation Campaigns on the Greenland Ice Sheet
Hashimoto, A, M. Niwano, T. Aoki, S. Tsutaki, S. Sugiyama, T. Yamasaki, Y. Iizuka, S. Matoba
Low Temperature Science, 75, 91, 104, 低温科学第75巻編集委員会, Mar. 2017
English, As part of a research project titled, "Snow Impurity and Glacial Microbe effects on abruptwarming in the Arctic" (SIGMA), numerous observation campaigns were conducted on the Greenlandice sheet (GrIS) from FY2011 to FY2015. To support research activities in the field, the JapanMeteorological Agency Non-Hydrostatic Model (JMA-NHM) was applied to form a numerical weatherprediction system covering all of Greenland. Before executing our numerical simulation using thismodel, however, we modified the model to better represent the meteorological processes over theGrIS, since the original model was adjusted to fit mid-latitude environments. Using our modifiedmodel, we performed numerical weather prediction twice per day such that expedition crews in thefield could access the resulting prediction information in the morning and evening, which helped themplan and execute their daily missions. Further, we improved our model during these campaigns byreferencing the daily reports obtained from the observation site on the GrIS. In this paper, wedescribe our weather prediction system and evaluate its performance in reference to surfacemeteorological observation data.

氷河融解水を起源とする高濁度水プルームの数値モデリング　　　　　　　　　　　　　　　
松村義正, 大橋良彦, 青木茂, 杉山慎
低温科学, 75, 77, 84, Mar. 2017
Japanese

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, Mar. 2017
Japanese

グリーンランド氷床北西部沿岸部における表面質量収支の変動　　　　　　　　　　　　　　　
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, Mar. 2017
Japanese

Seismic and infrasound monitoring of Bowdoin Glacier, Greenland
Podolskiy, E.A, R. Genco, S. Sugiyama, F. Walter, M. Funk, M. Minowa, S. Tsutaki, M. Ripepe
Low Temperature Science, 75, 15, 36, 低温科学第75巻編集委員会, Mar. 2017
English, Outlet glaciers in Greenland have retreated and lost mass over the past decade. Understandingthe dynamics of tidewater glaciers is crucial for forecasting sea-level rise and for understanding thefuture of the Greenland Ice Sheet, given the buttressing support that tidewater glaciers provide toinland ice. However, the mechanisms controlling glacier-front location and the role played byexternal forcings (e.g., meltwater input and tidal oscillation) in basal motion and fracture formationleading to iceberg calving are poorly understood. Today it is known that glaciers generate seismicand infrasound signals that are detectable at local and teleseismic distances and can be used to monitorglacier dynamics. Here, we present examples of data recorded by a temporary network of seismicand infrasound instruments deployed at a tidewater glacier (Bowdoin Glacier, Greenland) in July 2015.Some stations were installed on ice at distances as close as ～ 250 m from the calving front,representing the closest deployments to the calving front that have been made to date. Multipleseismic and infrasound events were recorded by five seismic and six infrasound sensors, and linked tosurface crevassing, calving, and ice-cliff collapses, and presumably also hydrofracturing, icebergrotations, teleseismic earthquakes, and helicopter-induced tremors. Using classic seismological andarray analysis approaches (e.g., "short-term averaging/long-term averaging" and "f-k" analysis), as wellas image processing techniques, we explore this unique dataset to understand the glacial response toexternal forcings. Our observations, supported by GPS measurements of ice velocity, local weatherstationrecords, and time-lapse photography, provide a valuable resource for studying seismogenicglacial processes and their dependence on ocean tides and other environmental factors.

Recent ice mass loss in northwestern Greenland -Results of the GRENE Greenland project and overview of the ArCS-
Sugiyama, S, S. Tsutaki, D. Sakakibara, J. Saito, Y. Ohashi, N. Katayama, E. Podolskiy, S. Matoba, M. Funk, R. Genco
Low Temperature Science, 75, 1, 13, 低温科学第75巻編集委員会, Mar. 2017
English, The Greenland ice sheet and peripheral ice caps are rapidly losing mass. This mass change hasbeen captured by satellite remote sensing, but more detailed investigations are necessary tounderstand the spatiotemporal variations and mechanism of the ice loss. It has increased particularlyin northwestern Greenland, but in-situ data for northern Greenland are generally sparse. To betterunderstand the ice mass loss in northwestern Greenland, we studied the ice sheet, ice caps and calvingglaciers in the Qaanaaq region, as a part of the Green Network of Excellence (GRENE) Arctic ClimateChange Research Project. Field and satellite observations were performed to measure the mass lossof the ice caps and calving glaciers in the region. Detailed processes were investigated based on fieldmeasurements to understand mechanisms driving the ice loss. The field activities include massbalance monitoring on Qaanaaq Ice Cap since 2012, integrated field observations near the front ofBowdoin Glacier since 2013 and ocean measurements near the calving glaciers. In this contribution,we summarize the results of the GRENE Greenland project, and introduce an overview of the nextproject to be carried out under the framework of the Arctic Challenge for Sustainability Project(ArCS).

Seasonal variations in ice-front position controlled by Frontal Ablation at Glaciar Perito Moreno, the Southern Patagonia Icefield
Masahiro Minowa, Shin Sugiyama, Daiki Sakakibara, Pedro Skvarca
Frontiers in Earth Science, 5, Frontiers Research Foundation, 24 Jan. 2017, [Peer-reviewed]
English, Scientific journal, The front position of calving glaciers is controlled by ice speed and frontal ablation which consists of the two processes of calving and subaqueous melting. However, the relative importance of these processes in frontal variation is difficult to assess and poorly understood, particularly for freshwater calving glaciers. To better understand the mechanism of seasonal variations involved in the ice front variations of freshwater calving glaciers, we measured front position, ice surface speed, air temperature, and proglacial lakewater temperature of Glaciar Perito Moreno in Patagonia. No substantial fluctuations in front position and ice speed occurred during the 15-year period studied (1999-2013), despite a warming trend in air temperature (0.059°C a-1). Seasonal variations were observed both in the ice-front position (±50 m) and ice speed (±15%). The frontal ablation rate, computed from the frontal displacement rate and the ice speed, varied in a seasonal manner with an amplitude approximately five times greater than that in the ice speed. The frontal ablation correlated well with seasonal lakewater temperature variations (r = 0.96) rather than with air temperature (r = 0.86). Our findings indicate that the seasonal ice front variations of Glaciar Perito Moreno are primarily due to frontal ablation, which is controlled through subaqueous melting by the thermal conditions of the lake.

「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　　　　　　　　　　　　　　　
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, 53, 1, 34, 40, 2017
Japanese

Thermal structure of proglacial lakes in Patagonia
Shin Sugiyama, Masahiro Minowa, Daiki Sakakibara, Pedro Skvarca, Takanobu Sawagaki, Yoshihiko Ohashi, Nozomu Naito, Kazuhisa Chikita
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 121, 12, 2270, 2286, AMER GEOPHYSICAL UNION, Dec. 2016, [Peer-reviewed]
English, Scientific journal, Calving glaciers are rapidly retreating in many regions under the influence of ice-water interactions at the glacier front. In contrast to the numerous researches conducted on fjords in front of tidewater glaciers, very few studies have been reported on lakes in which freshwater calving glaciers terminate. To better understand ice-water interactions at the front of freshwater calving glaciers, we measured lakewater temperature, turbidity, and bathymetry near Glaciar Perito Moreno, Upsala, and Viedma, large calving glaciers of the Southern Patagonia Icefield. The thermal structures of these lakes were significantly different from those reported in glacial fjords. There was no indication of upwelling subglacial meltwater; instead, turbid and cold glacial water discharge filled the region near the lake bottom. This was because water density was controlled by suspended sediment concentrations rather than by water temperature. Near-surface wind-driven circulation reaches a depth of similar to 180 m, forming a relatively warm isothermal layer (mean temperature of similar to 5-6 degrees C at Perito Moreno, similar to 3-4 degrees C at Upsala, and similar to 6-7 degrees C at Viedma), which should convey heat energy to the ice-water interface. However, the deeper part of the glacier front is in contact with stratified cold water, implying a limited amount of melting there. In the lake in front of Glaciar Viedma, the region deeper than 120 m was filled entirely with turbid and very cold water at pressure melting temperature. Our results revealed a previously unexplored thermal structure of proglacial lakes in Patagonia, suggesting its importance in the subaqueous melting of freshwater calving glaciers.

Greenland surface mass-balance observations from the ice-sheet ablation area and local glaciers
Horst Machguth, Henrik H. Thomsen, Anker Weidick, Andreas P. Ahlstrom, Jakob Abermann, Morten L. Andersen, Signe B. Andersen, Anders A. Bjork, Jason E. Box, Roger J. Braithwaite, Carl E. Boggild, Michele Citterio, Poul Clement, William Colgan, Robert S. Fausto, Karin Gleie, Stefanie Gubler, Bent Hasholt, Bernhard Hynek, Niels T. Knudsen, Signe H. Larsen, Sebastian H. Mernild, Johannes Oerlemans, Hans Oerter, Ole B. Olesen, C. J. P. Paul Smeets, Konrad Steffen, Manfred Stober, Shin Sugiyama, Dirk van As, Michiel R. van den Broeke, Roderik S. W. van de Wal
JOURNAL OF GLACIOLOGY, 62, 235, 861, 887, CAMBRIDGE UNIV PRESS, Oct. 2016, [Peer-reviewed]
English, Scientific journal, Glacier surface mass-balance measurements on Greenland started more than a century ago, but no compilation exists of the observations from the ablation area of the ice sheet and local glaciers. Such data could be used in the evaluation of modelled surface mass balance, or to document changes in glacier melt independently from model output. Here, we present a comprehensive database of Greenland glacier surface mass-balance observations from the ablation area of the ice sheet and local glaciers. The database spans the 123 a from 1892 to 2015, contains a total of similar to 3000 measurements from 46 sites, and is openly accessible through the PROMICE web portal (http://www.promice.dk). For each measurement we provide X, Y and Z coordinates, starting and ending dates as well as quality flags. We give sources for each entry and for all metadata. Two thirds of the data were collected from grey literature and unpublished archive documents. Roughly 60% of the measurements were performed by the Geological Survey of Denmark and Greenland (GEUS, previously GGU). The data cover all regions of Greenland except for the southernmost part of the east coast, but also emphasize the importance of long-term time series of which there are only two exceeding 20 a. We use the data to analyse uncertainties in point measurements of surface mass balance, as well as to estimate surface mass-balance profiles for most regions of Greenland.

ネパールヒマラヤ・トランバウ氷河における1980– 2015 年の表面標高変化
森本直矢, 杉山 慎, 藤田耕史, 坂井亜規子
北海道の雪氷, 35, 119, 122, Sep. 2016
Japanese

Spatial and temporal variations in high turbidity surface water off the Thule region, northwestern Greenland
Yoshihiko Ohashi, Takahiro Iida, Shin Sugiyama, Shigeru Aoki
POLAR SCIENCE, 10, 3, 270, 277, ELSEVIER SCIENCE BV, Sep. 2016, [Peer-reviewed]
English, Scientific journal, Glacial meltwater discharge from the Greenland ice sheet and ice caps forms high turbidity water in the proglacial ocean off the Greenland coast. Although the timing and magnitude of high turbidity water export affect the coastal marine environment, for example, through impacts on biological productivity, little is known about the characteristics of this high turbidity water. In this paper, we therefore report on the spatial and temporal variations in high turbidity water off the Thule region in northwestern Greenland, based on remote sensing, reflectance data at a wavelength of 555 nm (Rrs555). The high turbidity area, identified on the basis of high reflectivity (Rrs555 >= 0.0070 sr(-1)), was generally distributed near the coast, where many outlet glaciers terminate in the ocean and on land. The extent of the high turbidity area exhibited substantial seasonal and interannual variability, and its annual maximum extent was significantly correlated with summer air temperature. Assuming a linear relationship between the high turbidity area and summer temperature, annual maximum extent increases under the influence of increasing glacial meltwater discharge, as can be inferred from present and predicted future warming trends. (C) 2016 Elsevier B.V. and NIPR. All rights reserved.

Surface elevation change on ice caps in the Qaanaaq region, northwestern Greenland
Jun Saito, Shin Sugiyama, Shun Tsutaki, Takanobu Sawagaki
POLAR SCIENCE, 10, 3, 239, 248, ELSEVIER SCIENCE BV, Sep. 2016, [Peer-reviewed]
English, Scientific journal, A large number of glaciers and ice caps (GICs) are distributed along the Greenland coast, physically separated from the ice sheet. The total area of these GICs accounts for 5% of Greenland's ice cover. Melt water input from the GICs to the ocean substantially contributed to sea-level rise over the last century. Here, we report surface elevation changes of six ice caps near Qaanaaq (77 degrees 28'N, 69 degrees 13'W) in northwestern Greenland based on photogrammetric analysis of stereo pair satellite images. We processed the images with a digital map plotting instrument to generate digital elevation models (DEMs) in 2006 and 2010 with a grid resolution of 500 m. Generated DEMs were compared to measure surface elevation changes between 2006 and 2010. Over the study area of the six ice caps, covering 1215 km(2), the mean rate of elevation change was -1.1 +/- 0.1 m a(-1). This rate is significantly greater than that previously reported for the 2003-2008 period (-0.6 +/- 0.1 m a(-1)) for GICs all of northwestern Greenland. This increased mass loss is consistent with the rise in summer temperatures in this region at a rate of 0.12 degrees C a(-1) for the 1997-2013 period. (C) 2016 Elsevier B.V. and NIPR. All rights reserved.

Snow particle sizes and their distributions in Dronning Maud Land, Antarctica, at sample, local and regional scales
Susanne Ingvander, Peter Jansson, Ian A. Brown, Shuji Fujita, Shin Sugyama, Sylviane Surdyk, Hiroyuki Enomoto, Margareta Hansson, Per Holmlund
Antarctic Science, 28, 3, 219, 231, Cambridge University Press (CUP), Jun. 2016, [Peer-reviewed]
English, Scientific journal, In this study, snow particle size variability was investigated along a transect in Dronning Maud Land from the coast to the polar plateau. The aim of the study was to better understand the spatial and temporal variations in surface snow properties. Samples were collected twice daily during a traverse in 2007–08 to capture regional variability. Local variability was assessed by sampling in 10×10 m grids (5 m spacing) at selected locations. The particle size and shape distributions for each site were analysed through digital image analysis. Snow particle size variability is complex at different scales, and shows an internal variability of 0.18–3.31 mm depending on the sample type (surface, grid or pit). Relationships were verified between particle size and both elevation and distance to the coast (moisture source). Regional seasonal changes were also identified, particularly on the lower elevations of the polar plateau. This dataset may be used to quantitatively analyse the optical properties of surface snow for remote sensing. The details of the spatial and temporal variations observed in our data provide a basis for further studies of the complex and coupled processes affecting snow particle size and the interpretation of remote sensing of snow covered areas.

Tide-modulated ice flow variations drive seismicity near the calving front of Bowdoin Glacier, Greenland
Evgeny A. Podolskiy, Shin Sugiyama, Martin Funk, Fabian Walter, Riccardo Genco, Shun Tsutaki, Masahiro Minowa, Maurizio Ripepe
GEOPHYSICAL RESEARCH LETTERS, 43, 5, 2036, 2044, AMER GEOPHYSICAL UNION, Mar. 2016, [Peer-reviewed]
English, Scientific journal, Glacier microseismicity is a promising tool to study glacier dynamics. However, physical processes connecting seismic signals and ice dynamics are not clearly understood at present. Particularly, the relationship between tide-modulated seismicity and dynamics of calving glaciers remains elusive. Here we analyze records from an on-ice seismometer placed 250m from the calving front of Bowdoin Glacier, Greenland. Using high-frequency glacier flow speed measurements, we show that the microseismic activity is related to strain rate variations. The seismic activity correlates with longitudinal stretching measured at the glacier surface. Both higher melt rates and falling tides accelerate glacier motion and increase longitudinal stretching. Long-term microseismic monitoring could therefore provide insights on how a calving glacier's force balance and flow regime react to changes at the ice-ocean interface.

Surface elevation changes during 2007-13 on Bowdoin and Tugto Glaciers, northwestern Greenland
Shun Tsutaki, Shin Sugiyama, Daiki Sakakibara, Takanobu Sawagaki
JOURNAL OF GLACIOLOGY, 62, 236, 1083, 1092, CAMBRIDGE UNIV PRESS, 2016, [Peer-reviewed]
English, Scientific journal, To quantify recent thinning of marine-terminating outlet glaciers in northwestern Greenland, we carried out field and satellite observations near the terminus of Bowdoin Glacier. These data were used to compute the change in surface elevation from 2007 to 2013 and this rate of thinning was then compared with that of the adjacent land-terminating Tugto Glacier. Comparing DEMs of 2007 and 2010 shows that Bowdoin Glacier is thinning more rapidly (4.1 +/- 0.3 m a(-1)) than Tugto Glacier (2.8 +/- 0.3 m a(-1)). The observed negative surface mass-balance accounts for <40% of the elevation change of Bowdoin Glacier, meaning that the thinning of Bowdoin Glacier cannot be attributable to surface melting alone. The ice speed of Bowdoin Glacier increases down-glacier, reaching 457 m a(-1) near the calving front. This flow regime causes longitudinal stretching and vertical compression at a rate of -0.04 a(-1). It is likely that this dynamically-controlled thinning has been enhanced by the acceleration of the glacier since 2000. Our measurements indicate that ice dynamics indeed play a predominant role in the rapid thinning of Bowdoin Glacier.

Glaciological Data Collected by the 48th–54th Japanese Antarctic Research Expeditions during 2007–2013
Hideaki MOTOYAMA, Teruo FURUKAWA, Shuji FUJITA, Kunio SHINBORI, Yoichi TANAKA, Yuansheng LI, Ji-woong CHUNG, Fumio NAKAZAWA, Kotaro FUKUI, Hiroyuki ENOMOTO, Shin SUGIYAMA, Hitoshi ASANO, Yasuo TAKEDA, Motohiro HIRABAYASHI, Daisuke NISHIMURA, Takuya MASUNAGA, Takayuki KURAMOTO, Takuro KOBASHI, Ryo KUSAKA, Takeshi KINASE, Chusaku IKEDA, Toshitaka SUZUKI, Hiroshi OHNO, Yu HOSHINA, Yukiko HAYAKAWA, Takao KAMEDA
JARE data reports. Glaciology = JARE data reports. Glaciology, 35, 1, 44, Nov. 2015
English

Statistical and frequency analysis of calving by high-frequency surface wave measurement
Minowa, M, S. Sugiyama, D. Sakakibara, E. Podolskiy, Y. Ohashi, T. Sawagaki, N. Naito, P. Skvarca
Glaciology in Hokkaido, 34, 47, 50, Sep. 2015
Japanese

Hot water drilling at glaciers on Livingston Island, Antarctic Peninsula
Sugiyama, S, F. Navarro, T. Sawagaki, T. Segawa, Y. Onuma, E. Vasilenko
Glaciology in Hokkaido, 34, 51, 54, Sep. 2015
Japanese

Report of the 2007/2008 Japanese–Swedish joint Antarctic traverse: II. Details of the field expedition
S. Fujita, K. Fukui, F. Nakazawa, H. Enomoto, S. Sugiyama
Antarctic Record, 59, 1, 87, 161, 国立極地研究所, Mar. 2015, [Peer-reviewed]
Japanese, 南極地域観測第Ⅶ期5か年計画において， 2007/2008年の南極の夏期シーズンに，国立極地研究所を中心とした研究グループは，スウェーデンの研究者グループと共同で，東南極内陸域のドロンイングモードランド地域の内陸部の氷床環境調査を実施した．本報告は，本プロジェクトで実行された観測活動の全体像を記録し，報告するものである．内陸調査実行の概要，経過，人員・役割分担，設営，通信，ナビゲーション，観測の各項目を含む．本プロジェクトで得られた南極内陸高原部の資源，すなわち，データや試料を長い将来にわたって活用する際に，この実行経過の記録は重要な情報になるはずである．また，将来に類似の内陸調査を計画することがあれば，参考にできる経験が非常に多くあると確信する．In the seventh five-year plan of the Japanese Antarctic Research Expedition, Japanese scientists (led by the National Institute of Polar Research) together with a group of Swedish scientists conducted an intensive field campaign across Dronning Maud Land, East Antarctica, during the 2007/2008 austral summer season. This paper details the entire scope of the field activities of the project, and includes an outline of the field expedition, manning and roles, logistics, communications, navigation, and observations. This report should provide valuable information for future programs in Antarctica.

The Greenland ice sheet and peripheral glaciers under warming climate
榎本 浩之, 金尾 政紀, 杉山 慎
月刊地球, 37, 2, 3, 8, 海洋出版, Feb. 2015
Japanese

温暖化とグリーンランド氷河氷床　　　　　　　　　　　　　　　
榎本浩之, 金尾政紀, 杉山慎, 齋藤冬樹, 坪井誠司, 永塚尚子
2, 3, 8, 2015

グリーンランド北西部における氷帽およびカービング氷河の変動　　　　　　　　　　　　　　　
杉山慎, 津滝俊, 榊原大貴, 斉藤潤, 丸山未妃呂, 澤柿教伸
月刊地球, 37, 2, 9, 18, Jan. 2015
Japanese

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, [Peer-reviewed]
English, Scientific journal

Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland
Shin Sugiyama, Daiki Sakakibara, Shun Tsutaki, Mihiro Maruyama, Takanobu Sawagaki
JOURNAL OF GLACIOLOGY, 61, 226, 223, 232, INT GLACIOL SOC, 2015, [Peer-reviewed]
English, Scientific journal, To better understand recent rapid recession of marine-terminating glaciers in Greenland, we performed satellite and field observations near the calving front of Bowdoin Glacier, a 3 km wide outlet glacier in northwestern Greenland. Satellite data revealed a clear transition to a rapidly retreating phase in 2008 from a relatively stable glacier condition that lasted for >20 years. Ice radar measurements showed that the glacier front is grounded, but very close to the floating condition. These results, in combination with the results of ocean depth soundings, suggest bed geometry in front of the glacier is the primary control on the rate and pattern of recent rapid retreat. Presumably, glacier thinning due to atmospheric and/or ocean warming triggered the initial retreat. In situ measurements showed complex short-term ice speed variations, which were correlated with air temperature, precipitation and ocean tides. Ice speed quickly responded to temperature rise and a heavy rain event, indicating rapid drainage of surface water to the bed. Semi-diurnal speed peaks coincided with low tides, suggesting the major role of the hydrostatic pressure acting on the calving face in the force balance. These observations demonstrate that the dynamics of Bowdoin Glacier are sensitive to small perturbations occurring near the calving front.

Contrasting glacier variations of Glaciar Perito Moreno and Glaciar Ameghino, Southern Patagonia Icefield
Masahiro Minowa, Shin Sugiyama, Daiki Sakakibara, Takanobu Sawagaki
ANNALS OF GLACIOLOGY, 56, 70, 26, 32, INT GLACIOL SOC, 2015, [Peer-reviewed]
English, Scientific journal, Glaciar Perito Moreno (GPM) and Glaciar Ameghino (GA), Southern Patagonia Icefield, are in contact in the accumulation area, but have shown contrasting frontal variations in the past few decades. To investigate recent changes of the two glaciers and processes controlling the different responses to similar climate conditions, we measured surface elevation change from 2000 to 2008 and terminus positions from 1999 to 2012 using several types of satellite data. GPM shows no significant changes in terminus position and 0.4 +/- 0.3 m a(-1) thickening over the period, whereas GA retreated 55 +/- 2 m a(-1) and thinned 2.6 +/- 0.3 m a(-1). Mass-balance measurements over the period 1999/2000 show that accumulation at GPM was ten times greater than that at GA, but ablation was only three times greater. The mass-balance-altitude profile is similar for the two glaciers; differences in the mass-balance distribution are caused by differences in the accumulation-area ratio (AAR). Our results suggest that the AAR and the calving flux exert strong control on the evolution of glaciers in the region.

Recent variations in the terminus position, ice velocity and surface elevation of Langhovde Glacier, East Antarctica
Takehiro Fukuda, Shin Sugiyama, Takanobu Sawagaki, Kazuki Nakamura
ANTARCTIC SCIENCE, 26, 6, 636, 645, CAMBRIDGE UNIV PRESS, Dec. 2014, [Peer-reviewed]
English, Scientific journal, To improve the understanding of the mechanism driving recent changes in outlet glaciers in East Antarctica, we measured changes in the terminus position, ice flow velocity and surface elevation of the Langhovde Glacier located on the Soya Coast. From satellite images from 2000-12 and field measurements taken in 2012 the glacier terminus position and flow velocity showed little change between 2003 and 2007. After this quiescent period, the glacier progressively advanced by 380m and the flow velocity increased near the calving front by 10m a(-1) from 2007-10. No significant change was observed in surface elevation during the study period. The changes in the terminus position and flow velocity imply a reduction in the calving rate from 93m a(-1) (2003-07) to 16m a(-1) (2007-10). This suggests that calving was inhibited by stable sea ice conditions in the ocean. Theses results indicate that the Langhovde Glacier was in a relatively stable condition during the study period, and its terminus position was controlled by the rate of calving under the influence of sea ice conditions.

Report of the 2007/2008 Japanese-Swedish joint Antarctic traverse(1)Planning, preparations, and outline of scientific achievements
Sylviane Surdyk, Shuji Fujita, Kotaro Fukui, Fumio Nakazawa, Hiroyuki Enomoto, Shin Sugiyama, Yoshiyuki Fujii, Koji Fujita, Teruo Furukawa, Keiichiro Hara, Yu Hoshina, Makoto Igarashi, Yoshinori Iizuka, Satoshi Imura, Hideaki Motoyama, Sylviane Surdyk, Ryu Uemura
Antarctic Record, 58, 3, 352, 392, 国立極地研究所, Nov. 2014
Japanese, 南極地域観測第Ⅶ期5か年計画に基づき，2007/2008 年の南極の夏期シーズンに，国立極地研究所を中心とした研究グループは，スウェーデンの研究者グループと共同で，東南極内陸域のドロンイングモードランド地域の内陸部の氷床環境調査を実施した．本報告は，現地調査前に5年間を費やした研究計画の企画検討の経過や行った事前準備と，現地野外観測を終了した後の6年間に得られた研究成果の概要をまとめるものである．本プロジェクトの調査により，南極内陸高原部の氷床環境の時空間分布について，多くの科学的知見が明らかになった．本報告はその概要を報告する．現地調査の実行の経過は別途の報告に記述する．In the seventh five-year plan of the Japanese Antarctic Research Expedition, a group of Japanese scientists (led by the National Institute of Polar Research) together with a group of Swedish scientists, conducted field surveys to better understand the glaciology of the ice sheet in Dronning Maud Land, East Antarctica, during the 2007/2008 austral summer season. This paper reports on the planning and field preparations, and outlines the scientific achievements of the field expedition. We have gained numerous new scientific insights on the spatio-temporal distribution of the ice sheet environment in the inland plateau. Here, we provide an overview of the new knowledge gained.

Ice-front variations and speed changes of calving glaciers in the Southern Patagonia Icefield from 1984 to 2011
Daiki Sakakibara, Shin Sugiyama
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 119, 11, 2541, 2554, AMER GEOPHYSICAL UNION, Nov. 2014, [Peer-reviewed]
English, Scientific journal, Patagonian icefields are losing volume, and their loss is due partly to rapid changes in their outlet glaciers that terminate in lakes or the ocean. Despite this key influence from outlet glaciers, relatively few of these calving glaciers have had high-frequency measurements on their frontal variations and ice speed changes. We describe here recent frontal variations and ice speed changes of all 28 major calving glaciers in the Southern Patagonia Icefield (SPI), including ice speed maps covering approximately half of the entire icefield. The analysis is based on satellite data from 1984 to 2011. Over this period, only the two termini of Glaciar Pio XI advanced. Of the remaining glacial fronts, 12 changed less than 0.5km, but 17 retreated at least 0.5km. In the latter group, three glacial fronts (Glaciar Jorge Montt, HPS12, and Upsala) retreated over 6km. Averaged over all 31 glacial fronts of the calving glaciers, the front positions retreated 1.56km (median is 0.71km). Along the flowline within 20km of the front, the ice speeds up to 5900200ma(-1). Except for regions showing large acceleration or deceleration, the mean speed over the measured area decreased by 30ma(-1) from 1984 to 2011. The three most rapidly retreating glaciers showed much larger acceleration near the calving front, suggesting that ice dynamics drive their rapid retreat. Thus, we see retreat as a long-term trend for the calving glaciers in the SPI, with behavior that implies a dynamically controlled rapid recession that may explain the recently reported volume change of the SPI.

グリーンランド北西部沿岸の海洋環境
大橋良彦, 飯田高大, 杉山 慎
北海道の雪氷, 33, 85, 88, Sep. 2014

グリーンランド北西部カナック氷帽における 質量収支・流動速度・表面高度変化の観測
丸山未妃呂, 津滝俊, 榊原大貴, 澤柿教伸, 杉山慎
北海道の雪氷, 33, 81, 84, Sep. 2014
Japanese

グリーンランド北西部における氷帽の表面高度変化
斉藤 潤, 津滝 俊, 澤柿 教伸, 杉山 慎
北海道の雪氷, 33, 77, 80, Sep. 2014
Japanese

グリーンランド北西部における氷床・氷帽・カービング氷河の変動
杉山慎, 澤柿教伸, 津滝俊, 榊原大貴, 丸山未妃呂
北海道の雪氷, 33, 73, 76, Sep. 2014
Japanese

Active water exchange and life near the grounding line of an Antarctic outlet glacier
Shin Sugiyama, Takanobu Sawagaki, Takehiro Fukuda, Shigeru Aoki
EARTH AND PLANETARY SCIENCE LETTERS, 399, 52, 60, ELSEVIER SCIENCE BV, Aug. 2014, [Peer-reviewed]
English, Scientific journal, The grounding line (GL) of the Antarctic ice sheet forms the boundary between grounded and floating ice along the coast. Near this line, warm oceanic water contacts the ice shelf, producing the ice sheet's highest basal-melt rate. Despite the importance of this region, water properties and circulations near the GL are largely unexplored because in-situ observations are difficult. Here we present direct evidence of warm ocean-water transport to the innermost part of the subshelf cavity (several hundred meters seaward from the GL) of Langhovde Glacier, an outlet glacier in East Antarctica. Our measurements come from boreholes drilled through the glacier's similar to 400-m-thick grounding zone. Beneath the grounding zone, we find a 10-24-m-deep water layer of uniform temperature and salinity (-1.45 degrees C; 34.25 PSU), values that roughly equal those measured in the ocean in front of the glacier. Moreover, living organisms are found in the thin subglacial water layer. These findings indicate active transport of water and nutrients from the adjacent ocean, meaning that the subshelf environment interacts directly and rapidly with the ocean. (C) 2014 The Authors. Published by Elsevier B.V.

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, INT GLACIOL SOC, 2014, [Peer-reviewed]
English, Scientific journal, 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.

南パタゴニア氷原ペリートモレノ氷河とアメギノ氷河における近年の末端変動と氷厚変化
箕輪昌紘, 榊原大貴, 杉山慎, 澤柿教伸, Pedro Skvarca
北海道の雪氷, 32, 114, 117, Jan. 2014
Japanese

Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse
K. Hara, F. Nakazawa, S. Fujita, K. Fukui, H. Enomoto, S. Sugiyama
ATMOSPHERIC CHEMISTRY AND PHYSICS, 14, 18, 10211, 10230, COPERNICUS GESELLSCHAFT MBH, 2014, [Peer-reviewed]
English, Scientific journal, Measurements of aerosol number concentrations and direct aerosol sampling were conducted on continental Antarctica during the traverse of the Japanese-Swedish joint Antarctic expedition (JASE) from 14 November 2007 until 24 January 2008. Aerosol concentrations in background conditions decreased gradually with latitude in inland regions during the traverse. The lowest aerosol number concentrations were 160 L-1 in D-p > 0.3 mu m, and 0.5 L-1 in Dp > 2 mu m. In contrast, aerosol concentrations reached 3278 L-1 in Dp > 0.3 mu m, and 215 L-1 in Dp > 2 mu m under strong wind conditions. The estimated aerosol mass concentrations were 0.04-5.7 mu gm(-3). Single particle analysis of aerosol particles collected during the JASE traverse was conducted using a scanning electron microscope equipped with an energy dispersive x ray spectrometer. Major aerosol constituents were sulfates in fine mode, and sulfate, sea salts, modified sea salts, and fractionated sea salts in coarse mode. K-rich sulfates, Mg-rich sulfate, Ca-rich sulfates, and minerals were identified as minor aerosol constituents. Horizontal features of Cl/Na ratios imply that sea-salt modification (i.e. Cl loss) occurred on the Antarctic continent during the summer. Most sea-salt particles in the continental region near the coast were modified with acidic sulfur species such as H2SO4 and CH3SO3H. By contrast, acidic species other than the acidic sulfur species (likely HNO3) contributed markedly to sea-salt modification in inland areas during the traverse. Mg-rich sea-salt particles and Mg-free sea-salt particles were present in coarse and fine modes from the coast to inland areas. These sea-salt particles might be associated with sea-salt fractionation on the snow surface of continental Antarctica.

Acceleration and flotation of a glacier terminus during formation of a proglacial lake in Rhonegletscher, Switzerland
Shun Tsutaki, Shin Sugiyama, Daisuke Nishimura, Martin Funk
Journal of Glaciology, 59, 215, 559, 570, Jul. 2013, [Peer-reviewed]
English, Scientific journal, In 2005 the ongoing retreat of Rhonegletscher, Switzerland, led to the formation of a proglacial lake. To investigate the influence of proglacial lake formation on the dynamics and evolution of glaciers, we measured horizontal flow velocity, vertical ice motion and water levels in boreholes with high spatial resolutions during the summer seasons of 2007-09. Annual flow speeds near the terminus increased by a factor of 2.7 from 2005/06 to 2007/08, and exceeded 20ma-1 in 2009. The velocity increased towards the glacier front, indicating that the ice was thinning under a longitudinally stretching flow regime. Our observations show that the increase in flow speed near the terminus was due to increases in basal motion as a result of ice thinning. During summer 2009, the ice surface at the terminus moved vertically upwards by up to 4.69m as the ice began to float on the lake. The observed ice motion can be explained by the upward bending of marginal ice and the formation of faults that cut through the entire ice thickness. We predict that if the current ice thinning continues, the basal water pressure will exceed the pressure exerted by the ice overburden, and the glacier will progressively disintegrate over an expanding area.

Changes in ice-flow velocity and surface elevation from 1874 to 2006 in Rhonegletscher, Switzerland
Daisuke Nishimura, Shin Sugiyama, Andreas Bauder, Martin Funk
Arctic, Antarctic, and Alpine Research, 45, 4, 552, 562, 2013, [Peer-reviewed]
English, Scientific journal, We have studied changes in the ice-flow velocity and ice thickness in Rhonegletscher, Switzerland, over the period 1874-2006. The flow velocity field and surface elevation were analyzed in the lower half of the glacier using aerial photograph pairs taken in 1970/1971, 1981/1982, 1999/2000, and 2005/2006. We also digitized velocities measured by Mercanton (1916) in 1874-1910 by tracking stones distributed on the glacier. The results showed that the ice-flow velocity and ice straining conditions were strongly influenced by changes in the glacier geometry over the last 100 years. For example, the longitudinal strain rate near the current terminus has changed from tensile to compressive since the retreat of the glacier over a steep bedrock slope to a relatively flat region. The velocity decreased over the studied region from 1981 to 2006, which is in agreement with the ice thinning during the same period. However, the rate of the velocity change was smaller in the post-1990 period, because the effect of the thinning on ice flow speed was partly canceled out by the effect of steepening of the ice surface. The velocity change also implied that the magnitude of basal ice motion was influenced by changing subglacial drainage conditions and proglacial lake formation. Our unique data set contributes to a better understanding of ice dynamics under changing glacier geometry.

Changes in ice thickness and flow velocity of Yala Glacier, Langtang Himal, Nepal, from 1982 to 2009
Shin Sugiyama, Kotaro Fukui, Koji Fujita, Kenta Tone, Satoru Yamaguchi
ANNALS OF GLACIOLOGY, 54, 64, 157, 162, INT GLACIOL SOC, 2013, [Peer-reviewed]
English, Scientific journal, To investigate recent glacier changes in the Himalayan region, we carried out GPS and ground-penetrating radar (GPR) measurements at Yala Glacier, a benchmark glacier in Nepal. Glacier surface elevation and ice thickness were surveyed along a 1.5 km profile from the glacier top to the terminus. Ice flow velocity was measured at five locations by surveying stakes for either 1 year or 4 day periods. Obtained surface elevation and ice velocity were compared with those measured in 1982 and 1996. The mean ice thickness along the radar profile was 36 m in 2009 and the ice has been thinning at rates of -0.69 +/- 0.25 and -0.75 +/- 0.24 m a(-1) during the periods 1982-96 and 1996-2009, respectively. The thinning rate increases down-glacier, reaching a magnitude up to -1.8 m a(-1) near the terminus from 1996 to 2009. The ice velocity has reduced by >70% from 1982 to 2009 in the lower half of the glacier. By assuming a constant driving stress over the glacier, the total ice volume in 2009 was estimated as 0.061 km(3). Our results indicate that Yala Glacier has lost similar to 40% of its ice volume over the last 27 years and that the rate of the mass loss has accelerated over the last decade.

Rapid retreat, acceleration and thinning of Glaciar Upsala, Southern Patagonia Icefield, initiated in 2008
Daiki Sakakibara, Shin Sugiyama, Takanobu Sawagaki, Sebastian Marinsek, Pedro Skvarca
ANNALS OF GLACIOLOGY, 54, 63, 131, 138, INT GLACIOL SOC, 2013, [Peer-reviewed]
English, Scientific journal, The Patagonia lcefields are characterized by a large number of outlet glaciers calving into lakes and the ocean. In contrast to the recent intensive research activities on tidewater glaciers in other regions, very few observations have been made on calving glaciers in Patagonia. We analysed satellite images of Glaciar Upsala, the third largest freshwater calving glacier in the Southern Patagonia Icefield, to investigate changes in its front position, ice velocity and surface elevation from 2000 to 2011. Our analyses revealed a clear transition from a relatively stable phase to a rapidly retreating and fast-flowing condition in 2008. The glacier front receded by 2.9 km, and the ice velocity increased by 20-50%, over the 2008-11 period. We also found that the ice surface lowered at a rate of up to 39 m a(-1) from 2006 to 2010. This magnitude and the rate of changes in the glacier front position, ice velocity and surface elevation are greater than previously reported for Glaciar Upsala, and comparable to recent observations of large tidewater glaciers in Greenland. Our data illustrate details of a rapidly retreating calving glacier in Patagonia that have been scarcely reported despite their importance to the mass budget of the Patagonia Icefields.

Ice speed measurements over the Southern Patagonia Ice Field
Sakakibara, D, S. Sugiyama
Glaciology in Hokkaido, 31, 101, 104, Sep. 2012
Japanese

Ice speed and thickness measurements at Langhovde Glacier, Antarctica
Fukuda, T, S. Sugiyama, T. Sawagaki
Glaciology in Hokkaido, 31, 97, 100, Sep. 2012
English

Borehole camera observation in boreholes drilled at Langhovde Glacier, Antarctica
Sawagaki, T, S. Sugiyama, T. Fukuda
Glaciology in Hokkaido, 31, 93, 96, Sep. 2012
Japanese

Hot water drilling at Langhovde Glacier, Antarctica
Sugiyama, S, T. Sawagaki, T. Fukuda
Glaciology in Hokkaido, 31, 89, 92, Sep. 2012
Japanese

Radar diagnosis of the subglacial conditions in Dronning Maud Land, East Antarctica
S. Fujita, P. Holmlund, K. Matsuoka, H. Enomoto, K. Fukui, F. Nakazawa, S. Sugiyama, S. Surdyk
CRYOSPHERE, 6, 5, 1203, 1219, COPERNICUS GESELLSCHAFT MBH, 2012, [Peer-reviewed]
English, Scientific journal, In order to better understand the spatial distribution of subglacial environments, ground-based radar profiling data were analyzed for a total distance of similar to 3300 km across Dronning Maud Land, East Antarctica. The relationship between geometrically corrected bed returned power [Pc bed] dB in decibels and ice thickness H was examined. When H is smaller than a critical value that varies according to location, [P-bed(c)](dB) tends to decrease relatively smoothly with increasing H, which is explicable primarily by the cumulative effect of dielectric attenuation within the ice. However, at locations where H is larger than the critical H values, anomalous increases and fluctuations in [P-bed(c)](dB) were observed, regardless of the choice of radar frequency or radar-pulse width. In addition, the amplitude of the fluctuations often range 10 similar to 20 dB. We argue that the anomalous increases are caused by higher bed reflectivity associated with the existence of subglacial water. We used these features to delineate frozen and temperate beds. Approximately two-thirds of the investigated area was found to have a temperate bed. The beds of the inland part of the ice sheet tend to be temperate, with the exception of subglacial high mountains. In contrast, the beds of coastal areas tend to be frozen, with the exception of fast-flowing ice on the subglacial lowland or troughs. We argue that this new analytical method can be applied to other regions.

Snow density along the route traversed by the Japanese-Swedish Antarctic Expedition 2007/08
Shin Sugiyama, Hiroyuki Enomoto, Shuji Fujita, Kotaro Fukui, Fumio Nakazawa, Per Holmlund, Sylviane Surdyk
JOURNAL OF GLACIOLOGY, 58, 209, 529, 539, INT GLACIOL SOC, 2012, [Peer-reviewed]
English, Scientific journal, During the Japanese-Swedish Antarctic traverse expedition of 2007/08, we measured the surface snow density at 46 locations along the 2800 km long route from Syowa station to Wasa station in East Antarctica. The mean snow density for the upper 1 (or 0.5) m layer varied from 333 to 439 kg m(-3) over a region spanning an elevation range of 365-3800 m a.s.l. The density variations were associated with the elevation of the sampling sites; the density decreased as the elevation increased, moving from the coastal region inland. However, the density was relatively insensitive to the change in elevation along the ridge on the Antarctic plateau between Dome F and Kohnen stations. Because surface wind is weak in this region, irrespective of elevation, the wind speed was suggested to play a key role in the near-surface densification. The results of multiple regression performed on the density using meteorological variables were significantly improved by the inclusion of wind speed as a predictor. The regression analysis yielded a linear dependence between the density and the wind speed, with a coefficient of 13.5 kg m(-3) (m s(-1))(-1). This relationship is nearly three times stronger than a value previously computed from a dataset available in Antarctica. Our data indicate that the wind speed is more important to estimates of the surface snow density in Antarctica than has been previously assumed.

Formation and metamorphism of stratified firn at sites located under spatial variations of accumulation rate and wind speed on the East Antarctic ice divide near Dome Fuji
Fujita, S, Enomoto, H, Fukui, K, Iizuka, Y, Motoyama, H, Nakazawa, F, Sugiyama, S, Surdyk, S
The Cryosphere Discussions, 6, 2, 1205-1267, 3, 2012
English, Abstract. The initial stage of postdepositional metamorphism in polar firn was investigated at sites located under spatial variations of accumulation rate and wind speed along the East Antarctic ice divide near Dome Fuji. A better understanding of this process is important for interpreting local insolation proxies used for astronomical dating of deep ice cores. Three 2–4 m deep pits were excavated and physical properties, including density ρ, grain size D, reflectance R of near infrared light and microwave dielectric anisotropy Δε, were investigated at high spatial resolution. We found that Δε ranges between 0.028 and 0.067 and that such high values occur in the surface ~0.1 m. In addition, short scale variations of ρ are correlated with those of Δε, and inversely correlated with those of D, confirming contrasting development of initially higher density layers and initially lower density layers. Moreover, postdepositional metamorphism makes these contrasts more distinct with increasing depths. Both the contrasts and Δε for given values of ρ are higher under lower accumulation rate conditions and under less windy conditions. Insolation efficiently causes evolution of strata of firn at the ice sheet surface under such conditions. Under more windy conditions, the strata contain more wind-driven hard layers with higher ρ and Δε and thus have larger fluctuations of ρ and Δε. We suggest that the initial variability of ρ at the surface and the duration of exposure to diurnal and seasonal temperature gradients play sequential roles in determining the physical/mechanical properties of firn, which is retained throughout the densification process.

Ice speed of a calving glacier modulated by small fluctuations in basal water pressure
Shin Sugiyama, Pedro Skvarca, Nozomu Naito, Hiroyuki Enomoto, Shun Tsutaki, Kenta Tone, Sebastian Marinsek, Masamu Aniya
NATURE GEOSCIENCE, 4, 9, 597, 600, NATURE PUBLISHING GROUP, Sep. 2011, [Peer-reviewed]
English, Scientific journal, Ice flow acceleration has played a crucial role in the rapid retreat of calving glaciers in Alaska(1,2), Greenland and Antarctica(3,4). Glaciers that calve in water flow much faster than those that terminate on land, as a result of enhanced basal ice motion where basal water pressure is high(5). However, a scarcity of subglacial observations in calving glaciers limits a mechanistic understanding. Here we present high-frequency measurements of ice speed and basal water pressures from Glaciar Perito Moreno, a fast-flowing calving glacier in Patagonia. We measured water pressure in boreholes drilled at a site where the glacier is 515 +/- 5m thick, and where more than 60% of the ice is below the level of proglacial lakes. We found that the mean basal water pressure was about 95% of the pressure imposed by the weight of the overlying ice. Moreover, changes in basal water pressure by a few per cent drove nearly 40% of the variations in ice flow speed. The ice speed was strongly correlated to air temperature, suggesting that glacier motion was modulated by water pressure changes as meltwater entered the system. We conclude that basal water pressure in calving glaciers is important for glacier dynamics, and closely connected to climate conditions.

Glaciological research project in Patagonia 2006-2009: Studies at Glaciar Perito Moreno, Hielo Patagónico Sur, in area of Hielo Patagónico Norte, and along the Pacific coast
Masamu Aniya, Pedro Skvarca, Shin Sugiyama, Tatsuto Aoki, Takane Matsumoto, Ryo Anma, Nozomu Naito, Hiroyuki Enomoto, Kazuaki Hori, Sebastián Marinsek, Keiko Konya, Takayuki Nuimura, Shun Tsutaki, Kenta Tone, Gonzalo Barcaza
Bulletin of Glaciological Research, 29, 1, 17, 2011, [Peer-reviewed]
English, Scientific journal, The Glaciological Research Project in Patagonia (GRPP) 2006-2009 was carried out with several objectives at Glaciar Perito Moreno of the Hielo Patagonico Sur (HPS), in the area of the Hielo Patagonico Norte (HPN) and along the Pacific coast. At Glaciar Perito Moreno, hot water drilling was carried out at about 5 km upstream from the terminus, reaching the glacier bottom at ca. 515 m, in order to monitor subglacial water pressure. Good positive correlations among air temperature, subglacial water pressure and glacier flow speed were found. Based on 14C dating of tree and organic samples, it is proposed that Glaciar Perito Moreno made two Little Ice Age (LIA) advances at AD1600-1700 and ca. 130-100 y BP (AD1820-50). Fan deltas located at the mouth of big rivers around Lago General Carrera (Buenos Aires) and Lago Cochrane (Pueyrredon), in the area east of the HPN, were investigated to elucidate their development. The variations of 21 outlet glaciers of the HPN elucidated from aerial surveys for 2004/ 05-2008/09 revealed an areal loss of 8.67 km2 in four years. A general slowing down of retreats was observed with a few exceptions. Meteorological measurements at Glaciar Exploradores of the HPN from 2005 to 2009 indicate that air temperature ranged from 17.4°C to - 10.5°C. The total annual precipitation was about 3000 mm. Glacier surface melt was observed at two spots. Sediment and water discharges from the glacier showed that while water discharge fluctuated a lot, suspended sediment concentration was rather stable in summer. A single channel seismic profiling during the JAMSTEC MR08-06 cruise identified a probable submerged moraine formed before the last glacial maximum (LGM) in the Golfo de Penas, south of Taitao Peninsula. Piston coring along the Chilean coast further indicates that ice-rafted debris recorded the LGM and earlier Late Pleistocene events of the glacial advance. © Japanese Society of Snow and Ice.

Spatial and temporal variability of snow accumulation rate on the East Antarctic ice divide between Dome Fuji and EPICA DML
S. Fujita, P. Holmlund, I. Andersson, I. Brown, H. Enomoto, Y. Fujii, K. Fujita, K. Fukui, T. Furukawa, M. Hansson, K. Hara, Y. Hoshina, M. Igarashi, Y. Iizuka, S. Imura, S. Ingvander, T. Karlin, H. Motoyama, F. Nakazawa, H. Oerter, L. E. Sjoberg, S. Sugiyama, S. Surdyk, J. Strom, R. Uemura, F. Wilhelms
CRYOSPHERE, 5, 4, 1057, 1081, COPERNICUS GESELLSCHAFT MBH, 2011, [Peer-reviewed]
English, Scientific journal, To better understand the spatio-temporal variability of the glaciological environment in Dronning Maud Land (DML), East Antarctica, a 2800-km-long Japanese-Swedish traverse was carried out. The route includes ice divides between two ice-coring sites at Dome Fuji and EPICA DML. We determined the surface mass balance (SMB) averaged over various time scales in the late Holocene based on studies of snow pits and firn cores, in addition to radar data. We find that the large-scale distribution of the SMB depends on the surface elevation and continentality, and that the SMB differs between the windward and leeward sides of ice divides for strong-wind events. We suggest that the SMB is highly influenced by interactions between the large-scale surface topography of ice divides and the wind field of strong-wind events that are often associated with high-precipitation events. Local variations in the SMB are governed by the local surface topography, which is influenced by the bedrock topography. In the eastern part of DML, the accumulation rate in the second half of the 20th century is found to be higher by similar to 15% than averages over longer periods of 722 a or 7.9 ka before AD 2008. A similar increasing trend has been reported for many inland plateau sites in Antarctica with the exception of several sites on the leeward side of the ice divides.

Hazard assessment investigations due to recent changes in Triftgletscher, Bernese Alps, Switzerland
P. Dalban Canassy, A. Bauder, M. Dost, R. Faeh, M. Funk, S. Margreth, B. Mueller, S. Sugiyama
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, 11, 8, 2149, 2162, COPERNICUS GESELLSCHAFT MBH, 2011, [Peer-reviewed]
English, Scientific journal, The details and the consequences of the recent retreat of Triftgletscher (Gadmertal, Bernese Alps, Switzerland) have been investigated. Geodetic volume changes indicate a strong decrease since 1929 while the position of the terminus remained practically unchanged until 1990. The role played by calving in the tongue retreat running from 2000 to 2006 is confirmed by means of a mass balance model including a calving criterion. Results show that without calving, it would have taken two years longer for the lake to form than has been observed. The consequences of the ensuing tongue destabilization are surveyed, first with an ice avalanche model and second with a hydraulic study of the potential impulse wave triggered by the impact of the falling ice mass in the lake. Results point out that ice avalanches with volumes greater that 1.10(6) m(3) will flow into the lake and that in the worst scenario, a discharge of 400 m(3) s(-1) is expected to reach the endangered area in Gadmertal 11 min after the break-off. In order to detect surface motion precursors to such ice avalanches, a photographic monitoring system was installed. The results indicate seasonal variations with peak velocity in summer and no significant change during the other months. Spectacular velocity increases were not observed so far.

Changes in glacier dynamics under the influence of proglacial lake formation in Rhonegletscher, Switzerland
Shun Tsutaki, Daisuke Nishimura, Takeshi Yoshizawa, Shin Sugiyama
ANNALS OF GLACIOLOGY, 52, 58, 31, 36, INT GLACIOL SOC, 2011, [Peer-reviewed]
English, Scientific journal, To investigate the impact of proglacial lake formation on the dynamics and evolution of glaciers, we measured the ice motion of the terminal part of Rhonegletscher, Switzerland, where a lake formed in 2005. In 2009, the flow velocity near the terminus was >20 m a(-1). One of the survey stakes tripled its velocity between 2006 and 2007. Since the lake water pressure was consistently close to the ice overburden pressure, it is likely that the high subglacial water pressure enhanced the basal ice motion. The estimated flow velocity due to ice shearing was negligibly small; almost 100% of the horizontal velocity near the terminus was caused by basal sliding. The longitudinal strain rate was large, 0.064 a(-1), indicating that much of the glacier thinning was due to ice dynamics. The region of ice flotation adjacent to the lake expanded between 2008 and 2009 as a result of glacier thinning. Accordingly, a huge uplift of the surface was observed in 2009. It is clear from the vertical ice motion as well as visual observations that the marginal part of the glacier began to float. The ice-thinning rate in the studied area from 2008 to 2009 was 3.4 m a(-1), larger than previous estimates.

Spatial distribution of surface ablation in the terminus of Rhonegletscher, Switzerland
Shin Sugiyama, Takeshi Yoshizawa, Matthias Huss, Shun Tsutaki, Daisuke Nishimura
ANNALS OF GLACIOLOGY, 52, 58, 1, 8, INT GLACIOL SOC, 2011, [Peer-reviewed]
English, Scientific journal, The spatial pattern of glacier surface melt was measured with a resolution of 20-100 m within a region extending 1 km up-glacier from the terminus of Rhonegletscher, Switzerland. The melt rate was monitored from 6 July to 6 September 2009 using 44 ablation stakes. We also measured the surface albedo near the stakes to investigate the importance of this parameter for the melt-rate distribution. The melt rate varied from 32.8 to 71.9 mm w.e. d(-1) in the study area. Our measurements suggest that the spatial variation of the melt rate can be explained by (1) shading of the ice surface by neighbouring mountains, (2) surface albedo and (3) effects of microclimate (e.g. radiation from side-walls) on the surface energy balance. The observed melt-rate distribution was compared to the results of a temperature-index melt model, which takes into account shading of direct solar illumination but not the other two effects. The model reproduces some important features of the field data, but its spatial variations are generally less than the measured values. Our study shows the importance of albedo and other local conditions in the accurate estimation of the small-scale melt-rate distribution.

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, INT GLACIOL SOC, 2011, [Peer-reviewed]
English, Scientific journal, 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.

Subglacial sediment distributions beneath Rhonegletscher in the Swiss Alps
Nishimura, D, S. Tsutaki, S. Sugiyama
Glaciology in Hokkaido, 30, 69, 72, 2011

Surface elevation measurements on Langhovde Glacier by analyzing ALOS/PRISM data
Fukuda, T, S. Sugiyama, T. Sawagaki
Glaciology in Hokkaido, 30, 75, 78, 2011

Observation of surface seismic activity changes of an Alpine glacier during a glacier-dammed lake outburst
P. -F. Roux, F. Walter, P. Riesen, S. Sugiyama, M. Funk
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 115, F3, F03014, AMER GEOPHYSICAL UNION, Jul. 2010, [Peer-reviewed]
English, Scientific journal, During the 2004 outburst flood of Gornersee, Switzerland, we observed surface microseismic activity (so-called icequakes) near the glacier-dammed lake on Gornergletscher. Using surface waves, we located near-surface tensile fracturing events by inverting time delays using a quasi-Newton scheme. We located 8520 near-surface events with uncertainties of less than 10 m. Seismic activity increased during the lake drainage, and the icequake epicenters migrated downglacier. Furthermore, we identified events whose fault plane orientations are nearly perpendicular to the local pattern of surface crevassing. These observations can be explained by the rotation of principal strains at the glacier surface deduced from local ice flow measurement which occurred during the flotation of the ice dam at the onset of the lake drainage. In general, we suggest that our technique is a useful tool to locate large data sets of microseismic events and can be used to monitor the temporal evolution of fracture processes and their dependence on glacier flow and glacier hydrology.

Surface ice motion deviating toward the margins during speed-up events at Gornergletscher, Switzerland
S. Sugiyama, A. Bauder, P. Riesen, M. Funk
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 115, F3, F03010, AMER GEOPHYSICAL UNION, Jul. 2010, [Peer-reviewed]
English, Scientific journal, High frequency ice flow measurements during speed-up events in Gornergletscher, Switzerland, revealed intriguing ice motion which has never been reported in detail before. During the summer 2005, more than a 100% flow speed increase was observed three times at four GPS stations installed across Gornergletscher. The speed-ups were accompanied by a decimeter scale surface uplift. Two of the events were triggered by intensive surface melt and rainfall, while the third one was due to the outburst of Gornersee, a glacier-dammed lake located 2 km upglacier. An interesting observation was ice motion deviating toward the side margins during the events. As the glacier accelerated, a transverse (cross glacier) velocity component was generated, turning the flow direction away from the central flow line toward the margins. When the glacier decelerated, the transverse velocity component reversed so that the ice flowed back to the azimuth of the initial flow direction. In the most significant case, the trajectory of the survey stake deviated from the original track by 0.2 m in the transverse direction. We hypothesize that the observed lateral ice motion was caused by locally elevated subglacial water pressure. When the ice sole decoupled from the bed at a part of the glacier, a point source of vertical displacement was transmitted to the surface through viscous ice. This caused the transverse as well as vertical surface motion, as observed in ground motion during magma intrusion. The hypothesis was tested with a two-dimensional ice flow model applied to the transverse glacier cross section. The model confirmed that the surface ice would move toward the margins as observed in Gornergletscher, if subglacial water pressure exceeded the ice overburden pressure over a limited part of the bed.

Dielectric permittivity of snow measured along the route traversed in the Japanese–Swedish Antarctic Expedition 2007/08
Shin Sugiyama, Hiroyuki Enomoto, Shuji Fujita, Kotaro Fukui, Fumio Nakazawa, Per Holmlund
Annals of Glaciology, 51, 55, 9, 15, Cambridge University Press (CUP), 2010, [Peer-reviewed]
English, Scientific journal, As a joint contribution of Japan and Sweden to the International Polar Year 2007–09, a field expedition between Syowa and Wasa stations in East Antarctica was carried out in the 2007/08 austral summer season. Along the 2800 km long expedition route, the dielectric permittivity of the upper 1 m snow layer was measured at intervals of approximately 50 km using a snow fork, a parallel-wire transmission-line resonator. More than 2000 measurements were performed under carefully calibrated conditions, mostly in the interior of Antarctica. The permittivity ε′ was a function of snow density as in previous studies on dry snow, but the values were significantly smaller than those reported before. In the light of the dielectric mixture theory, the relatively smaller ε′ obtained in this study can be attributed to the snow structures characteristic in the studied region. Our data suggest that the permittivity of snow in the Antarctic interior is significantly affected by weak bonding between snow grains, which is due to depth-hoar formation in the extremely low-temperature conditions.

The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland
Patrick Riesen, Shin Sugiyama, Martin Funk
JOURNAL OF GLACIOLOGY, 56, 196, 278, 286, INT GLACIOL SOC, 2010
English, Scientific journal, Gornergletscher, Switzerland, is located adjacent to the marginal lake Gornersee, which periodically drains. We measured glacier ice-flow velocities during two drainage events of the lake, in 2004 and 2006. The common feature of these events was that, during both, Gornersee filled to its maximum level and then overflowed. The events differed in that in 2004 Gornersee rapidly drained via a sudden subglacial connection, whereas in 2006 the lake water continued to overflow and slowly discharged into a nearby moulin. We analysed the changes in ice-flow velocities in the vicinity of Gornersee during the two drainage events, using a three-dimensional ice-flow model which is able to (1) simulate locally variable enhanced basal motion of the ice and (2) account for the load and release of water pressure exerted on the ice margin. We demonstrate that the key features of the observed flow changes can be reproduced adequately in the numerical model by considering these two effects as the main mechanisms. We interpret the 2006 flow changes to be dominated by the release of lake water pressure acting on the ice during the lake drainage. The 2004 ice-flow changes can be explained by enhanced basal motion, and the impact of the lake water pressure provides certain clues to some observations insufficiently explained by enhanced basal motion.

Hot-Water drilling at Glaciar Perito Moreno, Southern Patagonia Icefield
Shin Sugiyama, Kenta Tone, Kunio Shinbori, Sebastian Marinsek, Pedro Skvarca, Nozomu Naito, Hiroyuki Enomoto, Masamu Aniya
Bulletin of Glaciological Research, 28, 27, 32, 2010, [Peer-reviewed]
English, Scientific journal, Glaciar Perito Moreno is one of the major freshwater calving glaciers in the Southern Patagonia Icefield. Its fast-flowing characteristic is probably due to high water pressure at the glacier bed, however, subglacial conditions have never been observed in Patagonia until our recent undertaking. To investigate the role of subglacial water pressure in the calving glacier dynamics, we performed hot-water drilling at Glaciar Perito Moreno from February to March 2010. This study represents the first attempt ever at hot-water glacier drilling in Patagonia. Two boreholes were drilled to the bed at 4.7 km upglacier from the terminus, where the ice was revealed to be 515±5m thick and the bed located at about mbelow the proglacial lake level. The water levels in the boreholes were >
100m above the lake level, which indicates that more than 90% of the ice overburden pressure was balanced out by the subglacial water pressure. Water in the boreholes had drained away before the drilling reached the bed, suggesting the existence of an englacial drainage system. These results provide crucial information for understanding the hydraulic and hydrological conditions of calving glaciers. In order to drill a 500 m deep glacier, an existing hot-water drilling system was adapted by increasing the number of high-pressure hot-water machines. The drilling operation at Glaciar Perito Moreno confirmed the system's capacity to drill a 500-m-deep borehole at a rate of 50 m h-1 with fuel consumption rates of 15.71 h-1 for diesel and 3.91 h-1 for petrol. © 2010, THE JAPANESE SOCIETY OF SNOW AND ICE. All rights reserved.

Application to glacier observation of high-precision three-dimensional position measurement using cameras.
Hiroaki Ota, Takeshi Hashimoto, Yohei Nagakura, Shuhei Takamura, Akira Fukuda, Masamu Aniya, Nozomu Naito, Hiroyuki Enomoto, Shin Sugiyama, Pedro Skvarca
International Conference on Humans and Computers, HC '10, Aizu-Wakamatsu, Fukushima-ken, Japan, December 6-10, 2010, 195, 202, University of Aizu Press / ACM, 2010, [Peer-reviewed]

Ice thickness survey at Yala Glacier, Nepal Himalaya, in 2009
Tone, K, S. Sugiyama, K. Fukui, K. Fujita
Glaciology in Hokkaido, 29, 45, 48, 日本雪氷学会 北海道支部, 2010
English

Triggering and drainage mechanisms of the 2004 glacier-dammed lake outburst in Gornergletscher, Switzerland (vol 113, art no F04019, 2008)
S. Sugiyama, A. Bauder, M. Huss, P. Riesen, M. Funk
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 114, AMER GEOPHYSICAL UNION, Feb. 2009
English

Modelling the future retreat of Unteraargletscher　　　　　　　　　　　　　　　
Matthias Huss, Shin Sugiyama, Andreas Bauder, Martin Funk
Mitteilungen der Versuchsanstalt fur Wasserbau, Hydrologie und Glaziologie an der Eidgenossischen Technischen Hochschule Zurich, 213, 105, 122, 2009
English, Scientific journal, The future evolution of Unteraargletscher, a large valley glacier in the Swiss Alps, is assessed for the period 2005 to 2050 using a flowline model. Detailed measurements of surface velocity from the last decade allow us to relate ice flux to glacier thickness and width. Mass balance is calculated using a distributed temperature-index model calibrated with ice volume changes derived independently from comparison of repeated digital elevation models. The model was validated for the period 1961 to 2005 and showed good agreement between the simulated and observed evolution of surface geometry. Regional climate scenarios with seasonal resolution were used to investigate the anticipated response of Unteraargletscher to future climate changes. Three mass balance scenarios were defined, corresponding to 2.5 %, 50 % and 97.5 % quantiles of a statistical analysis of 16 different climate model results. We present a forecast of the future extent of Unteraargletscher in the next five decades and analyze relevant parameters with respect to the past. The model predicts a retreat of the glacier terminus of 800-1025 m by 2035, and of 1250-2300 m by 2050. The debris coverage of the glacier tongue reduces the retreat rate by a factor of three. The thinning rate increased by 50-183% by 2050 depending on the scenario applied, compared to the period 1997 to 2005.

Development of a hot water drilling system for subglacial and englacial measurements
Tsutaki, S, S. Sugiyama
Bulletin of Glaciological Research, 27, 7, 14, 2009, [Peer-reviewed]
English, Scientific journal

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

Survey report on avalanche occurred at Nitonupri in February 2009
Yamanoi, K, S. Sugiyama, H. Ohnishi, M. Takahashi, K. Nakamura
Glaciology in Hokkaido, 28, 41, 44, 2009

Triggering and drainage mechanisms of the 2004 glacier-dammed lake outburst in Gornergletscher, Switzerland
S. Sugiyama, A. Bauder, M. Huss, P. Riesen, M. Funk
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 113, F4, F04019, AMER GEOPHYSICAL UNION, Dec. 2008, [Peer-reviewed]
English, Scientific journal, To investigate the triggering and the drainage mechanisms of a glacier-dammed lake outburst, we conducted high-frequency measurements of the ice surface motion in the vicinity of Gornersee, an ice marginal lake on Gornergletscher, Switzerland. During the outburst event in July 2004, the ice surface within a distance of 400 m from the lakeshore moved vertically upward by up to 0.1 m. This vertical surface motion cannot be explained by vertical straining of ice which was measured in one of the boreholes; therefore, we suggest the separation of the glacier sole from the bed was caused by subglacially drained lake water. Our observation indicates that the lake water drained as a sheet-like flow through the space created by the basal separation. The upward surface motion was greater in the region where the ice flotation level was exceeded by the lake level, implying that the ice barrier was breached when the lake water hydraulically connected to the bed and lifted up the glacier. In addition to the centimeter-scale vertical ice motion, three survey stakes located within 100 m from the lake showed extraordinarily large vertical displacement of 0.5-3.0 m associated with abrupt changes in horizontal flow direction. A plausible interpretation is that the marginal ice wedge bent upward because of the buoyancy force generated by the drained water. Such bending is possible if subglacial and englacial fractures formed at about 200 m from the glacier margin and acted as a hinge. The newly formed and preexisting englacial fractures probably took the role of inducing englacial water drainage which preceded the outburst.

Benchmark experiments for higher-order and full-Stokes ice sheet models (ISMIP–HOM)
F. Pattyn, L. Perichon, A. Aschwanden, B. Breuer, B. de Smedt, O. Gagliardini, G. H. Gudmundsson, R. C. A. Hindmarsh, A. Hubbard, J. V. Johnson, T. Kleiner, Y. Konovalov, C. Martin, A. J. Payne, D. Pollard, S. Price, M. Rückamp, F. Saito, O. Souček, S. Sugiyama, T. Zwinger
The Cryosphere, 2, 2, 95, 108, Copernicus GmbH, 26 Aug. 2008, [Peer-reviewed]
English, Scientific journal, Abstract. We present the results of the first ice sheet model intercomparison project for higher-order and full-Stokes ice sheet models. These models are compared and verified in a series of six experiments of which one has an analytical solution obtained from a perturbation analysis. The experiments are applied to both 2-D and 3-D geometries; five experiments are steady-state diagnostic, and one has a time-dependent prognostic solution. All participating models give results that are in close agreement. A clear distinction can be made between higher-order models and those that solve the full system of equations. The full-Stokes models show a much smaller spread, hence are in better agreement with one another and with the analytical solution.

Hot water drilling and glaciological observations at the terminal part of Rhonegletscher, Switzerland in 2007
Sugiyama, S, S. Tsutaki, D. Nishimura, H. Blatter, A. Bauder, M. Funk
Bulletin of Glaciological Research, 26, 41, 47, 2008, [Peer-reviewed]
English, Scientific journal

Ice speed variations of Rhonegletscher in the Swiss Alps over the last 100 years
Nishimura, D, S. Sugiyama, A. Bauder, M. Funk
Glaciology in Hokkaido, 27, 41, 44, 2008

Development of a hotwater drilling system
Tsutaki, S, S. Sugiyama
Glaciology in Hokkaido, 27, 37, 40, 2008

Retreat scenarios of Unteraargletscher, Switzerland, using a combined ice-flow mass-balance model
Matthias Huss, Shin Sugiyama, Andreas Bauder, Martin Funk
ARCTIC ANTARCTIC AND ALPINE RESEARCH, 39, 3, 422, 431, INST ARCTIC ALPINE RES, Aug. 2007, [Peer-reviewed]
English, Scientific journal, The future evolution of Unteraargletscher, a large valley glacier in the Swiss Alps, is assessed for the period 2005 to 2050 using a flowline model. Detailed measurements of surface velocity from the last decade allow us to relate ice flux to glacier thickness and width. Mass balance is calculated using a distributed temperature-index model calibrated with ice volume changes derived independently from comparison of repeated digital elevation models. The model was validated for the period 1961 to 2005 and showed good agreement between the simulated and observed evolution of surface geometry. Regional climate scenarios with seasonal resolution were used to investigate the anticipated response of Unteraargletscher to future climate changes. Three mass balance scenarios were defined, corresponding to 2.5%, 50%, and 97.5% quantiles of a statistical analysis of 16 different climate model results. We present a forecast of the future extent of Unteraargletscher in the next five decades and analyze relevant parameters with respect to the past. The model predicts a retreat of the glacier terminus of 800-1025 in by 2035, and of 1250-2300 in by 2050. The debris coverage of the glacier tongue reduces the retreat rate by a factor of three. The thinning, rate increased by 50-183% by 2050 depending on the scenario applied, compared to the period 1997 to 2005.

Evolution of Rhonegletscher, Switzerland, over the past 125 years and in the future: application of an improved flowline model
Shin Sugiyama, Andreas Bauder, Conradin Zahno, Martin Funk
Annals of Glaciology, 46, 268, 274, Cambridge University Press (CUP), 2007, [Peer-reviewed], [Lead author]
English, Scientific journal, To study the past and future evolution of Rhonegletscher, Switzerland, a flowline model was developed to include valley shape effects more accurately than conventional flowband models. In the model, the ice flux at a gridpoint was computed by a two-dimensional ice-flow model applied to the valley cross-section. The results suggested the underestimation of the accumulation area, which seems to be a general problem of flowline modelling arising from the model’s one-dimensional nature. The corrected mass balance was coupled with the equilibrium-line altitude (ELA) change, which was reconstructed for the period 1878–2003 from temperature and precipitation records, to run the model for the past 125 years. The model satisfactorily reproduced both changes in the terminus position and the total ice volume derived from digital elevation models of the surface obtained by analyses of old maps and aerial photographs. This showed the model’s potential to simulate glacier evolution when an accurate mass balance could be determined. The future evolution of Rhonegletscher was evaluated with three mass-balance conditions: the mean for the period 1994–2003, and the most negative (2003) and positive (1978) mass-balance values for the past 50 years. The model predicted volume changes of –18%, –58% and +38% after 50 years for the three conditions, respectively.

Reversal of ice motion during the outburst of a glacier-dammed lake on Gornergletscher, Switzerland
Shin Sugiyama, Andreas Bauder, Patrik Weiss, Martin Funk
JOURNAL OF GLACIOLOGY, 53, 181, 172, 180, INT GLACIOL SOC, 2007, [Peer-reviewed]
English, Scientific journal, During the outburst flood of a glacier-dammed lake on Gornergletscher, Switzerland, in July 2004, the drained lake water triggered anomalous glacier motion. At the onset of the outburst, the ice-flow direction in the vicinity of the lake became closer to the central flowline. When the lake discharge magnitude decreased, the flow direction altered such that the ice moved back to the azimuth of the initial motion. At one of the survey points, where the ice flows parallel to the central flowline, the ice accelerated along the pre-event flow direction followed by a 180 degrees backward motion that lasted over 2 days. These observations indicate the impact of the lake outburst on the subglacial and englacial stress conditions; however, the reversal in the flow direction is difficult to explain by drawing on our current understanding of glacier mechanics. The timing and the timescale of the flow-direction changes suggest that the elastic glacier motion and its rebound played a role under the rapidly changing stress conditions, but the Young's modulus of ice is too large to cause the observed ice motion. Other processes, including basal separation and subglacial sediment deformation, are discussed as possible mechanisms for the reversal of the ice motion.

Measurements and modelling of diurnal flow variations in a temperate valley glacier
Sugiyama, S
Glacier Science and Environmental Change, 345, 347, 2006, [Peer-reviewed]
English

Surface strain anomaly induced by the storage and drainage of englacial water in Koryto glacier, Kamchatka, Russia
Shin Sugiyama, Renji Naruse, Yaroslav D. Murav’yev
Annals of Glaciology, 40, 232, 236, Cambridge University Press (CUP), 2005, [Peer-reviewed], [Lead author]
English, Scientific journal, To investigate short-term flow-pattern variations of a temperate glacier, longitudinal surface strain was measured with a wire strainmeter in the ablation area of Koryto glacier, Kamchatka, Russia. Strain-rate anomalies were observed in late summer 2000 that were triggered by a water overflow from a moulin near the measurement site followed by the drainage of accumulated water. The strain event started with (compressive) strain rates of >–10^–3 d^–1 lasting for 6 hours, which then became tensile. Similar strain-rate variations were observed again on the next day. During the event, basal sliding speed measured at the margin in the lower reach of the glacier fluctuated by about ±50% of the daily mean. Smaller and larger sliding speeds corresponded to the compressive and tensile surface strains, respectively. These measurements suggest that the storage and sudden drainage of water caused spatially non-uniform water-pressure fluctuations along the glacier, changing the sliding regime over short time periods.

Numerical simulation of glacier-valley cross section evolution
Seddik H, S. Sugiyama, R. Naruse
Bulletin of Glaciological Research, 22, 75, 79, 2005, [Peer-reviewed]
English, Scientific journal

Short-term variations in glacier flow controlled by subglacial water pressure at Lauteraargletscher, Bernese Alps, Switzerland
S Sugiyama, GH Gudmundsson
JOURNAL OF GLACIOLOGY, 50, 170, 353, 362, INT GLACIOL SOC, 2004, [Peer-reviewed]
English, Scientific journal, Short-term variations in horizontal and vertical surface motion were studied with high temporal resolution during the ablation season in Lauteraargletscher, Bernese Alps, Switzerland. Horizontal surface flow speed oscillated diurnally, showing a correlation with the water level in a borehole. Flow speed increased as a function of the water level, with an asymptote at the ice overburden level. This observation implied that the flow variations were principally controlled by the local water pressure which enhanced basal motions. Detailed examination of the diurnal variations, however, showed that the speed was larger when the pressure was increasing than when it was decreasing. Greater speed with increasing pressure was interpreted by subglacial watercavity opening and/or longitudinal stress coupling with the upper reaches of the glacier. Upward surface movements were observed when the glacier flow speed increased. Simultaneous measurement of internal vertical strain in a borehole showed that the uplift had two different sources: vertical straining of ice and volume increase of subglacial water cavities. The vertical surface movement was largely affected by the vertical strain, and the uplift events could not be simply attributed to cavity opening.

Numerical investigation of the effects of temporal variations in basal lubrication on englacial strain-rate distribution
S Sugiyama, GH Gudmundsson, J Helbing
ANNALS OF GLACIOLOGY, VOL 37, 37, 49, 54, INT GLACIOLOGICAL SOC, 2003, [Peer-reviewed]
English, Scientific journal, The effects of spatial and temporal variations in basal lubrication on the englacial strain rate and surface velocity distribution are investigated with a numerical ice-flow model. General aspects of the solutions are compared to measurements made on Lauteraargletscher, Switzerland, in 2001, that showed diurnal fluctuations in both surface velocity and englacial vertical strain. We find that spatial gradients in basal lubrication can set up variations in the deviatoric stress field that increases with distance to the bed and has a maximum value near the glacier surface. This stress field produces a significant strain rate near the surface. The temporal evolution of a slippery zone is identified as a possible cause of the observed diurnal variations in the vertical strain rate. Although general aspects of the measurements can be explained in this way, the calculated vertical strain rates are too small, suggesting that the modeled effective viscosity values using Glen's flow law are too large near the surface.

Initial investigations of dynamics of the maritime Koryto glacier, Kamchatka, Russia
S Yamaguchi, R Naruse, S Sugiyama, T Matsumoto, YD Murav'yev
JOURNAL OF GLACIOLOGY, 49, 165, 173, 178, INT GLACIOL SOC, 2003, [Peer-reviewed]
English, Scientific journal, Ice-flow velocities were measured at Koryto glacier on Kamchatka Peninsula, Russia, during a 37 day period in the middle of the 2000 melt season. Six survey points from the upper to the lower reaches of the glacier exhibited daily fluctuations in surface horizontal speed with major peaks that appeared at all points. We argue that basal motion is the major cause of flow on Koryto glacier. Downward vertical velocities measured over most of the glacier during the survey period are likely due to shrinking of englacial and subglacial cavities. This result may imply that a large amount of water is deposited in the early summer. Since 1960, Koryto glacier has retreated by 450 m and this retreat has accelerated following a decrease in winter precipitation after the mid 1970s. The glacier has thinned by 10-50 m during the last 40 years.

Influence of surface debris on summer ablation in Unteraar- and Lauteraargletscher, Switzerland　　　　　　　　　　　　　　　
Sugiyama, S
Bulletin of Glaciological Research, 20, 41, 47, 2003, [Peer-reviewed]
English, Scientific journal

Diurnal variations in vertical strain observed in a temperate valley glacier
Shin Sugiyama, G. Hilmar Gudmundsson
Geophysical Research Letters, 30, 2, American Geophysical Union (AGU), Jan. 2003, [Peer-reviewed], [Lead author]
English, Scientific journal, During a period of diurnal fluctuations in glacial flows speed, vertical strain wasmeasured with sub-daily temporal resolution on Unteraargletscher, Switzerland. Mean verticalstrain in boreholes up to 300-m deep out of 400-m-thick ice was found to fluctuate diurnally.Vertical strain rates were extensile in the daytime and compressive at night, with a magnitude ofup to 10-3 day-1. Horizontal surface strain was observed to fluctuate in a manner consistent withthe vertical deformation. Diurnal surface flow speed variations correlated well with basal waterpressures suggesting a basal control on temporal flow variations. Nevertheless, the strain ratemeasurements indicated that changes in surface flow speed is affected by internal icedeformation and not a direct measure of local basal motion. Basal conditions in the surroundingneighborhood and their temporal variations take important role in short-term glacial flowfluctuations.

Phase relationship between 3C-and 6H-silicon carbide at high pressure and high temperature
S Sugiyama, M Togaya
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 84, 12, 3013, 3016, AMER CERAMIC SOC, Dec. 2001, [Peer-reviewed]
English, Scientific journal, The phase relationship between 3C- and 6H-SiC is investigated in the pressure range 2.5-6.5 GPa and the temperature range 400 degrees -2500 degreesC, by analyzing recovered samples, using X-ray diffractometry and Raman-scattering techniques. The phased transition from 3C- to 6H-SiC occurs at 2200 degreesC and 2.5 GPa. In the pressure range >4.5 GPa, 6H-SiC transforms to 3C-SiC at 2500 degreesC, via an intermediate state, as indicated by broadening peaks in the X-ray diffraction profile. Thermodynamically, 3C-SiC appears to be the low-temperature stable form, and the temperature of transition to 611-SiC, which is stable at high temperature, appears to increase with pressure.

Melting Behavior of β-SiC at High Pressure
Motohiro Togaya, Shin Sugiyama
Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, 7, 1037, 1039, 1998, [Peer-reviewed]
English, Scientific journal, The melting behavior of β -SiC with diamond structure was investigated under high pressures up to about 10 GPa using a flash-heating device. The peritectic temperature, at which the SiC decomposes into two phases of carbon saturated liquid Si and solid carbon (graphite) by a peritectic reaction, increases with pressure and the formation temperature of one liquid phase (l-SiC) also tends to increase with pressure. The solubility of carbon in liquid Si reach 50% at about 10 GPa and β -SiC melts directly into l-SiC. © 1998, The Japan Society of High Pressure Science and Technology. All rights reserved.

MELTING LINE OF GRAPHITE
M TOGAYA, S SUGIYAMA, E MIZUHARA
HIGH-PRESSURE SCIENCE AND TECHNOLOGY - 1993, PTS 1 AND 2, 255, 258, AIP PRESS, 1994, [Peer-reviewed]
English, International conference proceedings

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, 2021, 34, 34, 2021
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Dynamics of dissolved iron and dissolved organic matter in a glacial fjord; Inglefield Bredning in northwest Greenland.
Kanna Naoya, Sugiyama Shin, Ando Takuto, Asaji Izumi, Yefan Wang, Sakuragi Yuta, Nishioka Jun, Yamashita Yohei, Abstracts of Annual Meeting of the Geochemical Society of Japan, 68, 41, 2021
海洋における腐植様蛍光物質(FDOMH)は、海洋の微量栄養物質である鉄と有機錯体を形成し、海水中に鉄を溶解させる役割を担う。FDOMHは、陸由来のものと海洋自生性のものに区別されるが、北大西洋では、北極海に注ぐ河川からのFDOMHの影響が大きいため、塩分とFDOMHの蛍光強度に負の相関がみられる。北大西洋に面するグリーンランド沿岸では、河川水に加えて陸氷(氷河、氷山)の融解水が流入する。この融解水が、海洋におけるFDOMHや鉄の動態にどのような影響を与えるかは不明である。本研究では、グリーンランド北西部のフィヨルドにおいて、氷河の融解水が海水中のFDOMHと鉄の動態に与える影響を調べた。, GEOCHEMICAL SOCIETY OF JAPAN, Japanese

Underwater melting of freshwater calving glaciers in Patagonia
Shin Sugiyama, Masahiro Minowa, Pedro Skvarca, Marius Schaefer, Open Access Government, October Issue, 176, 177, Oct. 2020, [Invited], [Lead author]
English, Introduction commerce magazine, 27685669

Mass loss of the Antarctic ice sheet driven by ice-ocean interaction　　　　　　　　　　　　　　　
Shin Sugiyama, Masahiro Minowa, Open Access Government, October Issue, 174, 175, Oct. 2020, [Invited], [Lead author]
English, Introduction commerce magazine

Glacier melting in Greenland: Impact on marine ecosystem and society
Shin Sugiyama, Evgeny Podolskiy, Naoya Kanna, Open Access Government, October Issue, 172, 173, Oct. 2020, [Invited], [Lead author]
English, Introduction commerce magazine, 27685771

グリーンランドにおける自然環境変化とその社会影響 ―極北の村カナックからの報告―
杉山慎, Arctic Curcle（北海道立北方民族博物館友の会季刊誌）, 114, 4, 9, Mar. 2020, [Invited], [Lead author]
Japanese, Introduction research institution, 26019601

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, 2020, 66, 66, 2020
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Numerical modeling of glacier frontal ablation based by observational dataset
箕輪昌紘, 杉山慎, Truffer Martin, Skvarca Pedro, 雪氷研究大会講演要旨集(Web), 2020, 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

Year-round oceanic measurements under the ice shelf of Langhove Glacier in Antarctica
杉山慎, 箕輪昌紘, 雪氷研究大会講演要旨集(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, 2019

南極ラングホブデ氷河における氷河下の海洋環境
山根志織, 山根志織, 杉山慎, 箕輪昌紘, 伊藤優人, 日本海洋学会大会講演要旨集, 2018, 2018

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
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Influence of bed geometry on the retreat of Glaciar Grey in the Southern Patagonia Icefield
Yamamoto Yoshihiro, Sugiyama Shin, Minowa Masahiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 189, 189, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Iceberg drifting in Bowdoin fjord, northwestern Greenland
Fukumoto Shungo, Sakakibara Daiki, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 117, 117, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Floods of proglacial streams in Qaanaaq, northwestern Greenland
Sakakibara Daiki, Niwano Masashi, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 289, 289, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Underwater ice front structure plays a role in calving at Grey Glacier in Patagonia
Sugiyama Shin, Minowa Masahiro, Yamamoto Yoshihiro, Schaefer Marius, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 84, 84, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Relationship between ice front variation and submarine topography in the Bowdoin glacier in northwest Greenland
Asaji Izumi, Sakakibara Daiki, Sugiyama Shin, Yamasaki Shintaro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 85, 85, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

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, 2017, 288, 288, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

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, 2017, 190, 190, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Changes of ice-front position in Langhovde Glacier, Antarctica
Yamane Shiori, Minowa Masahiro, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 169, 169, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

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, 2017, 191, 191, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Variation in aerosol composition in the last 60 years around SE Greenland reconstructed by inclusion analysis using Raman spectroscopy.
Ando Takuto, Iizuka Yoshinori, Ohno Hiroshi, Sugiyama Shin, Abstracts of Annual Meeting of the Geochemical Society of Japan, 64th, ROMBUNNO.1A20(J‐STAGE), 20, 2017

, GEOCHEMICAL SOCIETY OF JAPAN, Japanese

Weak Layers of Slab Avalanches Occurred in Hokkaido in the Decade from 2007 to 2017 - The investigations of Snow Damage Research Team in Hokkaido Branch of JSSI -
Ozeki Toshihiro, Sawagaki Takanobu, Shimoyama Kou, Sugiyama Shin, Yamanoi Katsumi, Yamaguchi Satoru, Akitaya Eizi, Arakawa Hayato, Hachikubo Akihiro, Harada Yusuke, Iwahana Go, Kodama Yuji, Nakamura Kazuki, Sakakibara Daiki, Sakakibara Ken-ichi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2017, 0, 2017
公益社団法人 日本雪氷学会／日本雪工学会, Japanese

南極氷床と気候の変動及び相互作用に関する研究展望
川村賢二, 川村賢二, 川村賢二, 杉山慎, 植村立, 本山秀明, 本山秀明, 澤柿教伸, 飯塚芳徳, 堀内一穂, 青木周司, 東久美子, 東久美子, 藤田秀二, 藤田秀二, 関宰, 平林幹啓, 大藪幾美, 日本地球惑星科学連合大会予稿集(Web), 2017, ROMBUNNO.MIS10‐12 (WEB ONLY), 2017
Japanese

Weak Layers of Slab Avalanches Occurred in Hokkaido in the Decade from 2007 to 2017 - The investigations of Snow Damage Research Team in Hokkaido Branch of JSSI -
尾関俊浩, 荒川逸人, 八久保晶弘, 原田裕介, 岩花剛, 兒玉裕二, 中村一樹, 榊原大貴, 榊原健一, 澤柿教伸, 下山宏, 杉山慎, 山野井克己, 山口悟, 秋田谷英次, 雪氷研究大会講演要旨集(Web), 2017, 214(J‐STAGE), 214, 2017
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Automatic weather station in polar region: SIGMA and JARE
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, 263(J‐STAGE), 2017
Japanese

Effect of turbid glacial meltwater discharge on marine ecosystems in the fjord of Bowdoin Glacier in northwestern Greenland
漢那直也, 杉山慎, 杉山慎, 大橋良彦, 榊原大貴, 西沢文吾, 浅地泉, 深町康, 深町康, 阿部義之, 山口篤, 雪氷研究大会講演要旨集(Web), 2017, 0, 286(J‐STAGE), 286, 2017
公益社団法人 日本雪氷学会／日本雪工学会, Japanese

Surface elevation change of Trambau Glacier in Nepal Himalaya from 1980 to 2015
Morimoto Naoya, Shin Shin, Fujita Koji, Sakai Akiko, Sunako Sojiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2016, 182, 2016
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Effects from ocean and atmosphere on ice-front position of tidewater glaciers, northwest Greenland
箕輪昌紘, 箕輪昌紘, 杉山慎, 澤柿教伸, 津滝俊, 榊原大貴, 榊原大貴, 大橋良彦, 大橋良彦, 青木茂, 雪氷研究大会講演要旨集(Web), 2016, 2016

Study on frontal ablation of a freshwater calving glacier in the Southern Patagonia Icefield
箕輪昌紘, 箕輪昌紘, 杉山慎, 榊原大貴, Skvarca Pedro, 大橋良彦, 大橋良彦, 澤柿教伸, 内藤望, 雪氷研究大会講演要旨集(Web), 2016, 2016

Recent retreat of Glaciar Grey in the Southern Patagonia Icefield
山本淳博, 山本淳博, 箕輪昌紘, 箕輪昌紘, 杉山慎, 雪氷研究大会講演要旨集(Web), 2016, 2016

Calving front of Grey Glacier in Patagonia is sticking out to the lake under the water surface
杉山慎, 箕輪昌紘, 箕輪昌紘, Schaefer Marius, 雪氷研究大会講演要旨集(Web), 2016, 2016

南極ドームふじのでのフィルン層構造の変態:近赤外光の反射率と他の結晶組織構造や化学特性との関係の発達
藤田秀二, 藤田秀二, 東久美子, 東久美子, 榎本浩之, 榎本浩之, 榎本浩之, 福井幸太郎, 福井幸太郎, 平林幹啓, 堀彰, 保科優, 保科優, 飯塚芳徳, 望月優子, 本山秀明, 本山秀明, 中澤文男, 杉山慎, SURDYK Sylviane, 高橋和也, 日本地球惑星科学連合大会予稿集(Web), 2016, 2016

Study on frontal ablation of a freshwater calving glacier in the Southern Patagonia Icefield
Minowa Masahiro, Sugyama Shin, Sakakibara Daiki, Skvarca Pedro, Ohashi Yoshihiko, Sawagaki Takanobu, Naito Nozomu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2016, 0, 184, 184, 2016
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Recent ice mass loss in northwestern Greenland — Results of the GRENE Greenland project and overview of the ArCS —
Sugiyama Shin, Matsuno Satoshi, Sawagaki Takanobu, Matoba Sumito, Greve Ralf, Seddik Hakime, Funk Martin, Genco Riccardo, Enomoto Hiroyuki, Tsutaki Shun, Sakakibara Daiki, Saito Jun, Ohashi Yoshihiko, Maruyama Mihiro, Katayama Naoki, Podolskiy Evgeny, Minowa Masahiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2016, 0, 224, 224, 2016
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Effects from ocean and atmosphere on ice-front position of tidewater glaciers, northwest Greenland
Minowa Masahiro, Sugiyama Shin, Sawagaki Takanobu, Tsutaki Shun, Sakakibara Daiki, Ohashi Yoshihiko, Aoki Shigeru, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2016, 0, 29, 29, 2016
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

滞在記 南極半島リビングストン島での氷河観測と熱水掘削
杉山 慎, 澤柿 教伸, 瀬川 高弘, 雪氷, 77, 5, 451, 456, Sep. 2015
日本雪氷学会, Japanese

南極半島リビングストン島での氷河熱水掘削と雪氷生物調査　　　　　　　　　　　　　　　
杉山慎, 澤柿教伸, 瀬川高弘, 大沼友貴彦, 雪氷, 77, 5, i, ii, Sep. 2015
Japanese, Others

Mechanisms of frontal ablation change, Glaciar Perito Moreno Patagonia
箕輪昌紘, 箕輪昌紘, 杉山慎, 榊原大貴, 榊原大貴, Pedro Skvarca, 大橋良彦, 大橋良彦, 澤柿教伸, 内藤望, 雪氷研究大会講演要旨集(Web), 2015, 2015

Seasonal variation in ice-front position of Bowdoin Glacier, northwest Greenland
Minowa Masahiro, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 186, 186, 2015
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Surface elevation change on Trambau Glacier, Nepal Himalaya, based on ALOS PRISM image analysis
Morimoto Naoya, Sugiyama Shin, Fujita Koji, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 189, 189, 2015
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

An application of the mass balance model "DeTIM" to the Ice Caps in northeastern Greenland
Konya Keiko, Saito Jun, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 37, 37, 2015
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Mechanisms for rapid reterat and speedup of Glanciar Upsala, Southern Patagonia Icefield
Sakakibara Daiki, Sugiyama Shin, Minowa Masahiro, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 3, 3, 2015
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

航空機SAR PiSAR2による剣岳の氷河観測-その2-
古屋正人, 福井幸太郎, 松岡建志, 児島正一郎, 杉山慎, 澤柿教伸, 日本測地学会講演会要旨, 124th, 2015

Mechanisms of frontal ablation change, Glaciar Perito Moreno Patagonia
Minowa Masahiro, Sugiyama Shin, Sakakibara Daiki, Pedro Skvarca, Ohashi Yoshihiko, Sawagaki Takanobu, Naito Nozomi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 0, 4, 4, 2015, [Peer-reviewed]
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Ice surface temperature on Qaanaaq ice cap, northwestern Greenland
Tsutaki Shun, Sugiyama Shin, Sawagaki Takanobu, Sakakibara Daiki, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 0, 35, 35, 2015
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Measurements of flow speeds on calving glaciers derived from continuous GPS survey　　　　　　　　　　　　　　　
Tsutaki S, Sugiyama S, Nakatsubo S, Shinbori K, Chigai T, Mori S, 北海道大学低温科学研究所技術部技術報告, 20, 25, 28, Dec. 2014
Japanese, Report research institution

航空機SAR PiSAR2による剣岳の氷河観測
古屋正人, 福井幸太郎, 松岡建志, 児島正一郎, 杉山慎, 澤柿教伸, 日本測地学会講演会要旨, 122nd, 2014

Field measurements of mass balance, ice speed and elevation change on Qaanaaq Ice Cap, northwestern Greenland
Maruyama Mihiro, Tsutaki Shun, Sugiyama Shin, Sawagaki Takanobu, Sakakibara Daiki, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 1, 1, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Resent technologies of shallow/intermediate depth drill and borehole measurement
Motoyama Hideaki, Sawagaki Takanobu, Takata Morimasa, Furusaki Atsushi, Takahashi Akiyoshi, Tanaka Yoichi, Miyahara Morihiro, Shinbori Kunio, Matoba Sumito, Sugiyama Shin, Mori Shoichi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 183, 183, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Survey of surface elevation on Glaciar Perito Moreno, Southern Patagonia Icefield in December, 2013
Naito Nozomu, Minowa Masahiro, Sakakibara Daiki, Ohashi Yoshihiko, Sawagaki Takanobu, Sugiyama Shin, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 189, 189, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Influence of bed topography on retreat and speedup of Glaciar Upsala, Southern Patagonia Icefield
Sakakibara Daiki, Minowa Masahiro, Sugiyama Shin, Sawagaki Takanobu, Naito Nozomu, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 4, 4, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Ice thickness change of Bowdoin Glacier and Tugto Glacier in northwestern Greenland
Tsutaki Shun, Sugiyama Shin, Sakakibara Daiki, Sawagaki Takanobu, Maruyama Mihiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 61, 61, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Surface elevation change on ice caps in northwestern Greenland
Saito Jun, Tsutaki Shun, Sawagaki Takanobu, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 60, 60, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Thermal structures of proglacial lakes in the Southern Patagonia Icefield
Sugiyama Shin, Minowa Masahiro, Sakakibara Daiki, Ohashi Yoshihiko, Skvarca Pedro, Sawagaki Takanobu, Naito Nozomu, Chikita Kazuhisa, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 6, 6, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Mechanisms of frontal position change in Glaciar Perito Moreno, Southern Patagonia Icefield
Minowa Masahiro, Sugiyama Shin, Pedro Skvarca, Sakakibara Daiki, Ohashi Yoshihiko, Sawagaki Takanobu, Naitou Nozomu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 0, 5, 5, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

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, 雪氷研究大会講演要旨集, 2013, 3, 05 Sep. 2013
Japanese

南パタゴニア氷原の氷河　　　　　　　　　　　　　　　
杉山慎, 澤柿教伸, 榊原大貴, 箕輪昌紘, 武藤みなみ, 内藤望, Pedro Skvarca, 雪氷 雪氷写真館, 75, 5, i, ii, Sep. 2013
Japanese, Report scientific journal

グリーンランド西岸の氷帽、カービング氷河、氷床周縁部　　　　　　　　　　　　　　　
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, Jul. 2013
Japanese, Report scientific journal

Deep borehole logging at Dome Fuji Station, Antarctica
Motoyama Hideaki, Shinbori Kunio, Mori Shoichi, Furusaki Atsushi, Takahashi Akiyoshi, Tanaka Yoichi, Miyahara Morihiro, Takata Morimasa, Sawagaki Takanobu, Matoba Sumito, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 155, 155, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Changes in surface elevation of glaciers and icecaps in northwest Greenland
Saito Jun, Sakakibara Daiki, Minowa Masahiro, Tsutaki Shun, Sawagaki Takanobu, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 156, 156, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Changes in surface elevation of Bowdoin Gletscher, Greenland
Tsutaki Shun, Sugiyama Shin, Sakakibara Daiki, Maruyama Mihiro, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 1, 1, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Change of terminus position, flow velocity and surface elevation in the Langhovde Glacier, Antarctica
Fukuda Takehiro, Sugiyama Shin, Sawagaki Takanobu, Nakamura Kazuki, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 12, 12, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Survey for ice thickness variation of Glaciar Perito Moreno, Southern Patagonia Icefield
Naito Nozomu, Minowa Masahiro, Sakakibara Daiki, Sawagaki Takanobu, Muto Minami, Sugiyama Shin, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 264, 264, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Observations in the proglacial lake of Glaciar Viedma, Southern Patagonia Icefield
Minowa Masahiro, Sugiyama Shin, Sawagaki Takanobu, Naito Nozomu, Sakakibara Daiki, Muto Minami, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 263, 263, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Thinning of Qaanaaq Ice Cap in northwestern Greenland
Matsuno Satoshi, Sakakibara Daiki, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 271, 271, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Short term ice speed variations in three calving glaciers in the Southern Patagonia Icefield
Sugiyama Shin, Sawagaki Takanobu, Naito Nozomu, Sakakibara Daiki, Minowa Masahiro, Muto Minami, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 96, 96, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Field measurements on Qaanaaq Ice Cap in northwestern Greenland
Maruyama Mihiro, Sugiyama Shin, Matsuno Satoshi, Sawagaki Takanobu, Tsutaki Shun, Sakakibara Daiki, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2013, 0, 98, 98, 2013
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Hot water drilling at the Langhovde Glacier, Antarctica
Sawagaki Takanobu, Sugiyama Shin, Fukuda Takehiro, Proceedings of the General Meeting of the Association of Japanese Geographers, 2013, 0, 70, 70, 2013
第53次南極観測隊の夏期オペレーションにおいて，南極ラングホブデ氷河の接地線付近を熱水掘削し，掘削孔を用いて氷河の底面観測を行った．熱水掘削による南極氷床の底面観測は，日本の南極観測では初めてで，世界でも実施例が限られる挑戦的な試みである．本稿では，熱水掘削システムについて紹介した後，観測地と野外活動の概要，および熱 水掘削の結果について報告する．, The Association of Japanese Geographers

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
Japanese

「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)の紹介
青木輝夫, 朽木勝幸, 庭野匡思, 田中泰宙, 保坂征宏, 橋本明弘, 本山秀明, 兒玉裕二, 植竹淳, 竹内望, 的場澄人, 杉山慎, 山口悟, 本吉弘岐, 岩田幸良, 杉浦幸之助, 八久保晶弘, 堀雅裕, 谷川朋範, 本谷研, 山崎哲秀, 日本気象学会大会講演予稿集, 102, 102, 453, 453, 30 Sep. 2012
日本気象学会, Japanese

ブータンヒマラヤにおける氷河・氷河湖相互作用
津滝俊, 藤田耕史, 山口悟, 坂井亜規子, 縫村崇行, 杉山慎, 小森次郎, 竹中修平, TSHERING Phuntsho, 雪氷研究大会講演要旨集, 2012, 54, 62, 10 Sep. 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Hot water drilling at Langhovde Glacier　　　　　　　　　　　　　　　
福田武博, 杉山慎, 澤柿教伸, 樋口和生, Seppyo, 7, 3, i, ii, Jun. 2012
Japanese, Report scientific journal

論文賞を受賞して
杉山 慎, 内藤 望, 榎本 浩之, 刀根 賢太, 安仁屋 政武, 雪氷 : 日本雪氷協會雜誌, 74, 1, 84, 85, 15 Jan. 2012
Japanese

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, 2012, 161, 161, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Velocity fields of calving glaciers in the Southern Patagonia Icefield measured using satellite images
Sakakibara Daiki, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 4, 4, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Basal sediment distribution beneath Rhonegletscher, Switzerland
Nishimura Daisuke, Sugiyama shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 61, 61, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Borehole video observation of Langhovde Glacier, Antarctica
Sawagaki Takanobu, Sugiyama Shin, Fukuda Takehiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 0, 120, 120, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Hot water drilling in the grounding zone of Langhovde Glacier, Antarctica
Sugiyama Shin, Sawagaki Takanobu, Fukuda Takehiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 0, 119, 119, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Ice velocity and thickness measurements at the Langhovde Glacier, Antarctica
Fukuda Takehiro, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 0, 118, 118, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Satellite image analyses of an ice cap and glaciers near Qaanaaq, Northwest Greenland
Matsuno Satoshi, Sakakibara Daiki, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 0, 220, 220, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Changes in frontal position and surface elevation of Glacier Perito Moreno and Glacier Ameghino, Patagonia
Minowa Masahiro, Sakakibara Daiki, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 0, 3, 3, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

東南極ドロンニングモードランドの氷床底面環境
藤田秀二, HOLMLUND P., 松岡健一, 榎本浩之, 榎本浩之, 福井幸太郎, 福井幸太郎, 中澤文男, 杉山慎, SURDYK S., 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

ドームふじおよびEPICA DMLの2つの深層掘削地点を含む東南極ドロンニングモードランドでの雪の堆積の時系列変化
藤田秀二, HOLMLUND P., ANDERSSON I., BROWN I., 榎本浩之, 榎本浩之, 藤井理行, 藤田耕史, 福井幸太郎, 福井幸太郎, 古川晶雄, HANSSON M., 原圭一郎, 保科優, 五十嵐誠, 飯塚芳徳, 伊村智, INGVANDER S., KARLIN T., 本山秀明, 中澤文男, OERTER H., SJOEBERG L.E, 杉山慎, SURDYK S., STROEM J., 植村立, WILHELMS F., 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

ドームふじ表層4mの詳細物理層位-氷床コアシグナル形成過程理解の深化を目指して-
藤田秀二, 榎本浩之, 榎本浩之, 福井幸太郎, 福井幸太郎, 藤田耕史, 保科優, 飯塚芳徳, 中澤文男, 杉山慎, 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

国際雪氷学会シンポジウム "International Symposium on Snow, Ice and Humanity in a Changing Climate" 開催報告
阿部 修, 石井 吉之, 尾関 俊浩, 兒玉 裕二, 佐藤 篤司, 杉山 慎, 中村 一樹, 松下 拓樹, 的場 澄人, 雪氷, 73, 1, 39, 46, Jan. 2011
日本雪氷学会, Japanese

Recent rapid retreat and acceleration of Upsala Glacier, Patagonia
Sakakibara Daiki, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 0, 15, 15, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Stereo image analysis on surface topography of Langhovde Glacier, Antarctica
Fukuda Takehiro, Sugiyama Shin, Sawagaki Takanobu, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 0, 170, 170, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Spatial and temporal variability of snow accumulation in Dronning Maud Land, East Antarctica, including two deep ice coring sites at Dome Fuji and EPICA DML
Shuji Fujita, P. Holmlund, I. Andersson, I. Brown, H. I. Enomoto, Y. Fujii, K. Fujita, K. Fukui, T. Furukawa, M. Hansson, K. Hara, Y. Hoshina, M. Igarashi, Y. Iizuka, S. Imura, S. Ingvander, T. Kameda, T. Karlin, H. Motoyama, F. Nakazawa, H. Oerter, L. Sjöberg, S. Sugiyama, S. Surdyk, J. Ström, R. Uemura, F. Wilhelms, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 162, 2011
To form a clearer understanding of the spatio-temporal variability of the glaciological environment in Dronning Maud Land (DML), East Antarctica, glaciological investigations were carried out along the 2800-km-long Japanese-Swedish IPY 2007/2008 traverse. The traverse route covers ice sheet ridges and two deep ice coring sites at Dome Fuji and EPICA DML. The surface mass balance (SMB) distribution was derived based on analysis of isochrones within snow pit samples, fim core samples and subsurface radar signals. The SMB averaged over various time scales in the Holocene was determined. This was then compared with various data such as surface elevation, surface slope, prevailing windfield, ice thickness, polarization ratio of satellite-based microwave emissivity and normal backscattered strength of VHF radio waves from within the ice. We find that the large-scale distribution of the SMB depends on the surface elevation, continentality and interactions between ice sheet ridges and the prevailing counterclockwise windfield in DML. A different SMB is found for the windward and leeward sides of the ridges. Local-scale variability in the SMB is essentially governed by bedrock topography which determines the local surface topography and the probability of snow deposition. In the eastern part of DML, the accumulation rate in the second half of the 20th century is found to be higher by ~15% compared to averages over longer periods of 722 a or 7.9 ka before AD 2008. A similar trend has been reported for many inland plateau sites in East Antarctica. © 2011, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering. All rights reserved., English

国際雪氷学会シンポジウム "International Symposium on Glaciology in the International Polar Year" 報告
榎本 浩之, 齋藤 冬樹, 杉山 慎, 高橋 修平, 福井 幸太郎, 藤田 秀二, Journal of the Japanese Society of Snow and Ice, 72, 2, 127, 131, 15 Mar. 2010
1, Japanese

東南極ドームふじ近傍の氷床底面環境および氷床下湖の分布
藤田秀二, 榎本浩之, 藤井理行, 福井幸太郎, 古川晶雄, 伊村智, 本山秀明, 中澤文男, 杉山慎, SURDYK S., 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), 2010, 2010

東南極の2箇所の氷床コア深層掘削点であるEPICA-DMLとドームふじの間の地域の雪氷環境の空間的分布
藤田秀二, HOLMLUND P., ANDERSSON I., BROWN I., 榎本浩之, 藤井理行, 藤田耕史, 福井幸太郎, 古川晶雄, HANSSON M., 原圭一郎, 飯塚芳徳, 伊村智, INGVANDER S., KARLIN T., 本山秀明, 中澤文男, SJOEBERG L., 杉山慎, SURDYK S., STROEM J., 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), 2010, 2010

ネパールヒマラヤ・ヤラ氷河の氷厚および流動速度測定
刀根賢太, 杉山慎, 福井幸太郎, 藤田耕史, 雪氷研究大会講演要旨集, 2010, 2010

しもざらめ化に伴う積雪の物理特性の変化に関する実験的研究
山口悟, 阿部修, 杉山慎, 望月重人, 寒地技術論文・報告集(CD-ROM), 26, ROMBUNNO.I-016, 2010
Japanese

氷河底面堆積物貫入深度計による堆積物分布調査　　　　　　　　　　　　　　　
西村大輔, 津滝俊, 吉澤猛, 杉山慎, 新堀邦夫, 北海道大学低温科学研究所技術部技術報告, 16, 6, 9, 2010
Japanese

Diurnal flow speed variations in Perito Moreno Glacier, Patagonia
Sugiyama Shin, Tsutaki Shun, Naito Nozomu, Enomoto Hiroyuki, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 166, 166, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

A numerical glacier flow model for the ice core drilling site at Aurora Peak, Alaska
Fukuda Takehiro, Sugiyama Shin, Shiraiwa Takayuki, Matoba Sumito, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 167, 167, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Observation on dynamics of Glacier Perito Moreno, southern Patagonia Icefield in 2008/2009
Enomoto Hiroyuki, Naito Nozomu, Sugiyama Shin, Tsutaki Shun, Fukuda Akira, Aniya Masamu, Isono Shinji, Skvarca Pedro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 140, 140, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Development of glacier-dammed lake and its influence on glacier retreat in Rhonegletscher, Switzerland
Tsutaki Shun, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 141, 141, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Inclinometer measurement of borehole deformations in the terminus part in Rhonegletscher, Swiss Alps
Nishimura Daisuke, Tsutaki Shun, Sugiyama Shin, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 165, 165, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Spatial distribution of surface ablation in the terminus part of Rhonegletscher, Switzerland
Yoshizawa Takeshi, Sugiyama Shin, Huss Matthias, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 164, 164, 2009
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

国際極年における日本-スウェーデン南極トラバース氷床観測-新たな手法の導入による氷床内陸域から探る気候・氷床変動システムの解明-
榎本浩之, 杉山慎, 藤田秀二, SURDYK Sylviane, 福井幸太郎, HOLMLUND P., MANSSON M., INGVANDAR S., 日本気象学会大会講演予稿集, 96, 2009

2009年2月にニセコ・ニトヌプリで発生した乾雪表層雪崩
山野井克己, 杉山慎, 大西人史, 高橋学察, 中村一樹, 雪氷研究大会講演要旨集, 2009, 2009

南極氷床を巡る新規生物圏探査計画
伊村智, 杉山慎, 福井幸太郎, 極域気水圏シンポジウムプログラム・講演要旨, 31st, 2008

熱水ドリル掘削システムの構築　　　　　　　　　　　　　　　
津滝俊, 杉山慎, 中鉢健太, 北海道大学低温科学研究所技術部技術報告, 13, 25, 28, 2008
Japanese

氷河底面堆積物コアサンプラーの開発　　　　　　　　　　　　　　　
西村大輔, 津滝俊, 吉澤猛, 杉山慎, 新堀邦夫, 北海道大学低温科学研究所技術部技術報告, 14, 15, 18, 2008
Japanese

Construction of a hot water drilling system
Tsutaki Shun, Sugiyama Shin, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2007, 4, 4, 2007
THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese

Changes in surface flow speed over the past 100 years, Rhoneglestcher, Swiss Alps
Nishimura Daisuke, Sugiyama Shin, Funk Martin, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2007, 5, 5, 2007
THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese

Mechanism of glacier-dammed lake outburst:Observation at Gornergletscher, Switzerland
Sugiyama Shin, Bauder Andreas, Huss Matthias, Funk Martin, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2007, 20, 20, 2007
THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese

IGSシンポジウム 大規模気候変動指標としての寒冷圏 (Cryospheric Indicators of Global Change) 参加報告
亀田 貴雄, 杉山 慎, 櫻井 俊光, 力石 國男, 鈴木 利孝, 青木 輝夫, 門田 勤, 斉藤 冬樹, 堀 雅裕, BARCAZA Gonzalo, 雪氷, 68, 6, 661, 668, 15 Nov. 2006
日本雪氷学会, Japanese

Glacier dynamics during the outburst of a glacier-dammed lake
Sugiyama Shin, Bauder Andreas, Weiss Patrik, Funk Martin, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 204, 204, 2006
THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese

カムチャツカ半島カレイタ氷河における流出システム浮流土砂特性との関係
松元高峰, 紺屋恵子, 山田知充, 山口悟, 杉山慎, MURAVYEV Y D, 日本雪氷学会全国大会講演予稿集, 2001, 166, 20 Sep. 2001
Japanese

カムチャツカ半島・Koryto氷河の融解特性
紺屋恵子, 松元高峰, 山口悟, 杉山慎, 山田知充, MURAVYEV Y, 成瀬廉二, 日本雪氷学会全国大会講演予稿集, 2001, 65, 20 Sep. 2001
Japanese

カムチャツカ半島Koryto氷河における流動速度の日変化
山口悟, 成瀬廉二, 杉山慎, 松元高峰, 日本雪氷学会全国大会講演予稿集, 2001, 66, 20 Sep. 2001
Japanese

北極域の研究 その現状と将来構想
北極環境研究コンソーシアム長期構想編集委員会, 第1章1-5雪氷
海文堂, Mar. 2024, 27685771, [Editor]

変わりゆく北極
北極域研究加速プロジェクト(ArCS II)編集, 第2章 第1節 北極地域社会の変化
Feb. 2024, 27685771, [Joint work]

南極の氷に何が起きているか －気候変動と氷床の科学－　　　　　　　　　　　　　　　
杉山慎
中央公論新社, Nov. 2021, [Single work]

低温環境の科学事典　　　　　　　　　　　　　　　
河村公隆
朝倉書店, Jul. 2016, [Contributor]

低温科学便覧　　　　　　　　　　　　　　　
北海道大学低温科学研究所編, 第5章氷河
丸善出版, Oct. 2015, [Contributor]

地球惑星科学入門　　　　　　　　　　　　　　　
在田一則, 竹下徹, 見延庄士郎, 渡部重十編著, 第27章氷河と氷河時代
北海道大学出版会, 2010, [Contributor]

なぞの宝庫・南極大陸 100万年前の地球を読む　　　　　　　　　　　　　　　
飯塚芳徳, 澤柿教伸, 杉山慎, 的場澄人
技術評論社, 2008

Changes in coastal environments and their impact on society in northwestern Greenland
Shin Sugiyama, ArCS II Coastal Environments, Project members
EGU General Assembly 2024, 17 Apr. 2024, English, Oral presentation
27685771

Changes in coastal environments and their impact on society in Qaanaaq, northwestern Greenland
Shin Sugiyama, ArCS II Coastal Environments, Project members
IASC Network on Arctic Glaciology annual meeting, 22 Jan. 2024, English, Oral presentation
27685771

Multibeam sonar survey of underwater ice at the front of Glaciar Grey, a lake-terminating glacier in Patagonia
Shin Sugiyama, Shuntaro Hata, Takami Mori, Marius Schaefer, Paul Sandval
AGU Fall Meeting 2023, 11 Dec. 2023, English, Oral presentation
46253701

Mass loss of Qaanaaq Ice Cap in northwestern Greenland from 2012 to 2022　　　　　　　　　　　　　　　
Shin Sugiyama, Kaho Watanabe, Ken Kondo
IASC Network on Arctic Glaciology annual meeting, 26 Jan. 2023, English, Oral presentation

Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia　　　　　　　　　　　　　　　
Shin Sugiyama, Masahiro Minowa, Yasushi Fukamachi, Shuntaro Hata, Yoshihiro Yamamoto, Tobias Sauter, Christoph Schneider, Marius Schaefer
IGS (International Glaciological Society) Symposium on Maritime Glaciers in Juneau, Alaska, 20 Jun. 2022, English, Oral presentation

Hot-water drilling and subglacial measurement at Langhovde Glacier in East Antarctica
Shin Sugiyama, Ken Kondo, Masahiro Minowa
JpGU 2022 (Japan Geoscience Union Meeting), 25 May 2022, Japanese, Oral presentation
36716324

南極ラングホブデ氷河における2021/22年の熱水掘削
杉山慎, 近藤研, 箕輪昌紘
雪氷学会北海道支部研究発表会, 13 May 2022, Japanese, Oral presentation
36716324

パタゴニア・グレイ氷河前縁湖における水温と流速の季節変動　　　　　　　　　　　　　　　
杉山慎, 箕輪昌紘, 深町康, 波多俊太郎, 山本淳博, サウタ―・トビアス, シュナイダー・クリストフ, シェーファー・マリウス
雪氷研究大会（千葉・オンライン）, 12 Sep. 2021, Oral presentation

Greenland in a warming climate -Rapid environmental change and its impact on society-　　　　　　　　　　　　　　　
Shin Sugiyama
ASM3 (3rd Arctic Science Ministerial), 09 May 2021, English, Keynote oral presentation
[Invited]

Freshwater calving glaciers in Patagonia
Shin Sugiyama
International Glaciological Society Global Seminar Series, 02 Dec. 2020, English, Public discourse
27685669, [Invited]

Impact of Arctic Environmental Change on Society
Shin Sugiyama, Hiroki Takakura, Akihisa Konno
The 11th Symposium on Polar Science, 01 Dec. 2020, English, Invited oral presentation
27685771, [Invited]

グリーンランド北西部ボードイン氷河の末端部における短期流動変化
杉山慎, 津滝俊
雪氷研究大会（オンライン）, 18 Nov. 2020, Japanese, Oral presentation
16 Nov. 2020 - 18 Nov. 2020, 26019601

ArCS II Project: a new impetus for Japanese-Russian cooperation of research and education in the North
Shin Sugiyama
Cold Land Seminar “Japanese-Russian collaboration in the North”, 30 Sep. 2020, English, Invited oral presentation
27685771, [Invited]

Hot-water drilling for exploring subglacial environment of the Antarctic ice sheet　　　　　　　　　　　　　　　
Shin Sugiyama, Masahiro Minowa
JpGU-AGU Joint Meeting 2020, 13 Jul. 2020, English, Invited oral presentation
[Invited]

Short-term ice speed variations near the calving front of Bowdoin Glacier, northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama, Shun Tsutaki, Daiki Sakakibara, Izumi Asaji
Workshop on the Dynamics and Mass Budget of Arctic Glaciers & the IASC Network on Arctic Glaciology Annual Meeting, 29 Jan. 2020, English, Oral presentation
28 Jan. 2020 - 30 Jan. 2020

Changing natural environment and its impact on human society in Qaanaaq, northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama, ArCS Greenland Project member
Greenland Science Week 2019, 05 Dec. 2019, English, Oral presentation
[International presentation]

Seasonal variations in temperature, salinity and current under the floating tongue of Langhovde Glacier in East Antarctica　　　　　　　　　　　　　　　
Sugiyama, S, M. Minowa, S. Aoki
Forum for Research into Ice Shelf Processes (FRISP), 16 Sep. 2019, English, Oral presentation
[International presentation]

Year-round oceanic measurements under the ice shelf of Langhove Glacier in Antarctica　　　　　　　　　　　　　　　
Sugiyama, S, M. Minowa
雪氷研究大会, 11 Sep. 2019, Japanese, Oral presentation
[Domestic Conference]

Mass loss of the Antarctic ice sheet under the influence of ice-ocean interaction　　　　　　　　　　　　　　　
SUGIYAMA Shin
JPGU2019, 27 May 2019, Japanese, Invited oral presentation
[Invited], [Domestic Conference]

Glacier change, ice-ocean interaction, and their impacts on human society in Qaanaaq, northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama
IASC Workshop on the dynamicsand mass budget of Arctic glaciersand mass budget of Arctic glaciers& proglacial marine ecosystems& proglacial marine e, 21 Jan. 2019, English, Oral presentation
[International presentation]

Changing Natural Environment and its Impact on Human Society in Greenland　　　　　　　　　　　　　　　
SUGIYAMA Shin
International Law for Sustainability in Arctic Resource Development:Integrating economic, social, environmental and scientific dimensions, 17 Dec. 2018, English, Invited oral presentation
[Invited], [International presentation]

Hot water drilling at Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
Sugiyama S, Minowa, M, Masato, I, Yamane, S, Aoki, S, Tamura, T
GRAntarctic-NIPR Joint International Symposium on Ice-Ocean Interaction, 03 Dec. 2018, English, Oral presentation
[International presentation]

Hot water drilling and subshelf measurements at Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
Shin Sugiyama, Masahiro Minowa, Masato Ito, Shiori Yamane, Shigeru Aoki, Takeshi Tamura
JpGU 2018, 21 May 2018, English, Oral presentation
[Domestic Conference]

南極ラングホブデ氷河における熱水掘削　　　　　　　　　　　　　　　
杉山慎, 箕輪昌紘, 伊藤優人, 山根志織
雪氷学会北海道支部研究発表会, 11 May 2018, Japanese, Oral presentation
[Domestic Conference]

Coastal environment change and its impact on human society in northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama
JSPS Japan-Norway Symposium, 08 Jun. 2017, English, Oral presentation
[Invited], [International presentation]

Cryosphere - Greenland Ice Cap and Baffin Bay　　　　　　　　　　　　　　　
SUGIYAMA Shin
IMBeR, Arctic Continental Margins Workshop, 30 Mar. 2017, English, Invited oral presentation
[Invited], [International presentation]

Calving front of Grey Glacier in Patagonia is protruding into water under the lake surface　　　　　　　　　　　　　　　
Shin Sugiyama, Masahiro Minowa, Marius Schaefer
International Symposium on the Cryosphere in a Changing Climate, 13 Feb. 2017, English, Poster presentation
[International presentation]

Mass loss of outlet glaciers and ice caps in the Qaanaaq region, northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama, Shun Tsutaki, Daiki Sakakibara, Evgeny Podolskiy, Masahiro Minowa, Yoshihiko Ohashi, Martin Funk, Guillaume Jouvet, Julien Seguinot, Yvo Weidmann, Riccardo Genco
Workshop on the Dynamics and Mass Budget of Arctic Glaciers & the IASC Network on Arctic Glaciology Annual Meeting, 24 Jan. 2017, English, Oral presentation
[International presentation]

Recent ice mass loss of outlet glaciers and ice caps in the Qaanaaq region, northwestern Greenland　　　　　　　　　　　　　　　
Sugiyama, S. S. Tsutaki, D. Sakakibara, J. Saito, Y. Ohashi, M. Maruyama, N. Katayama, E.Podolskiy, M. Minowa, S. Matsuno, T. Sawagaki, S. Matoba, M. Funk, R. Genco, H. Enomoto
AGU fall meeting, 16 Dec. 2016, English, Poster presentation
[International presentation]

The ice sheet/glacier-ocean interaction in Greenland　　　　　　　　　　　　　　　
Shin Sugiyama
Arctic Circle Assembly 2016, 08 Oct. 2016, English, Invited oral presentation
[Invited], [International presentation]

Ice mass loss in northwestern Greenland　　　　　　　　　　　　　　　
Shin Sugiyama
Japan-Norway Arctic Science & Innovation Week 2016, 02 Jun. 2016, English, Oral presentation
[Invited], [International presentation]

Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland　　　　　　　　　　　　　　　
S. Sugiyama, S. Tsutaki, D. Sakakibara, J. Saito, M. Maruyama, N. Katayama, T. Sawagaki, M. Funk, A. Bauder
IGS International Symposium on Contemporary Ice-Sheet Dynamics, 18 Aug. 2015, English, Oral presentation
[International presentation]

Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland　　　　　　　　　　　　　　　
S. Sugiyama, S. Tsutaki, D. Sakakibara, J. Saito, M. Maruyama, N. Katayama, T. Sawagaki, M. Funk, A. Bauder
The Arctic Science Summit Week 2015 (ISAR-4/ICARP-III), 28 Apr. 2015, English, Oral presentation
[International presentation]

Surface elevation change on calving glaciers in northwestern Greenland
Katayama Naoki, Tsutaki Shun, Sakakibara Daiki, Sugiyama Shin, Sawagaki Takanobu
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese
2015 - 2015

Hot water drilling at glaciers on Livingston Island, Antarctic Peninsula
Sugiyama Shin, Navarro Francisco, Sawagaki Takanobu, Segawa Takahiro, Onuma Yukihiko, Vasilenko Evgeny
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese
2015 - 2015

Thermal structures of proglacial lakes in the Southern Patagonia Icefield　　　　　　　　　　　　　　　
Sugiyama, S, M. Minowa, D. Sakakibara, Y. Ohashi, P. Skvarca, T. Sawagaki, N. Naito
International Symposium on Contribution of Glaciers and Ice Sheets to Sea Level Change, 27 May 2014, English, Oral presentation
[International presentation]

Exploring Antarctic subglacial environment using hot water drilling　　　　　　　　　　　　　　　
SUGIYAMA Shin
The 4th Symposium on Polar Science, 13 Nov. 2013, English, Oral presentation

Mass loss of glaciers and ice caps in northwestern Greenland　　　　　　　　　　　　　　　
Sugiyama, S, S. Tsutaki, D. Sakakibara, T. Sawagaki, S. Matsuno, M. Minowa, M. Maruyama, J. Saito, S. Matoba, S. Yamaguchi
The 4th Symposium on Polar Science, 12 Nov. 2013, English, Oral presentation

Warm water and life beneath the grounding zone of an Antarctic outlet glacier　　　　　　　　　　　　　　　
Sugiyama, S, T. Sawagaki, T. Fukuda, S. Aoki
European Geosciences Union, 09 Apr. 2013, English, Oral presentation
[International presentation]

Ice mass loss in northwestern Greenland　　　　　　　　　　　　　　　
Sugiyama, S. Matoba, S. Yamaguchi, D. Sakakibara, S. Matsuno
3rd International Symposium on Arctic Research, 14 Jan. 2013, English, Oral presentation
[International presentation]

Hot water drilling and measurements beneath the grounding zone of Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
Sugiyama, S, T. Sawagaki, T. Fukuda
3rd Symposium on Polar Science, 26 Nov. 2012, English, Oral presentation
[International presentation]

Hot water drilling and subglacial observations at the floating tongue of Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
Sugiyama, S, T. Sawagaki, T. Fukuda
International Symposium on Glaciers and Ice Sheets in a Warming Climate, 24 Jun. 2012, English, Oral presentation
[International presentation]

Hot water drilling and subglacial measurements at the floating tongue of Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
Sugiyama, S, T. Sawagaki, T. Fukuda
26th International Forum for Research into Ice Shelf Processes, 12 Jun. 2012, English, Oral presentation
[International presentation]

Calving glacier dynamics controlled by subglacial water pressure close to ice overburden pressure in Glaciar Perito Moreno, Patagonia　　　　　　　　　　　　　　　
Sugiyama, S. P. Skvarca, N. Naito, H. Enomoto, K. Tone, S. Tsutaki, S. Marinsek, M. Aniy
European Geosciences Union General Assembly, 03 Apr. 2011, English, Oral presentation
[International presentation]

Observations of basal ice flow beneath Rhonegletscher, Switzerland
Daisuke Nishimura, Shun Tsutaki, Shin Sugiyama, Daisuke Nishimura, Shun Tsutaki
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, English
2011 - 2011

Calving Glacier Dynamics Controlled by Small Fluctuations in Subglacial Water Pressure Revealed by Hot Water Drilling in Glaciar Perito Moreno, Patagonia　　　　　　　　　　　　　　　
Sugiyama, S. P. Skvarca, N. Naito, H. Enomoto, K. Tone, S. Tsutaki, M. Aniya
American Geophysical Union Annual Fall Meeting, 13 Dec. 2010, English, Oral presentation
[International presentation]

Application to glacier observation of high-precision three-dimensional position measurement using cameras.
Hiroaki Ota, Takeshi Hashimoto, Yohei Nagakura, Shuhei Takamura, Akira Fukuda, Masamu Aniya, Nozomu Naito, Hiroyuki Enomoto, Shin Sugiyama, Pedro Skvarca
International Conference on Humans and Computers, HC '10, Aizu-Wakamatsu, Fukushima-ken, Japan, December 6-10, 2010, 2010, University of Aizu Press / ACM
2010 - 2010

Subglacial water pressure and flow speed measurements in Glaciar Perito Moreno, Patagonia
Shin Sugiyama, Nozomu Naito, Kenta Tone, Hiroyuki Enomoto, Pedro Skvarca, Masamu Aniya
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, English
2010 - 2010

Changes in the glacier flow regime after the proglacial lake formation in Rhonegletscher, Swiss Alps
Shun Tsutaki, Daisuke Nishimura, Takeshi Yoshizawa, Shin Sugiyama
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, English
2010 - 2010

Satellite-based study on surface elevation over Langhovde Glacier, Antarctica
Takehiro Fukuda, Shin Sugiyama
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, English
2010 - 2010

Seasonal variations in chemical species in the ice-cores drilled on Aurora Peak, Alaska
Akane Tsushima, Hirotaka Sasaki, Takehiro Fukuda, Sumito Matoba, Sachiko Okamoto, Shin Sugiyama, Takayuki Shiraiwa, Daniel Solie, Kenji Yoshikawa
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, English
2010 - 2010

Snow density and dielectric constant measurements along the traverse route of the Japanese-Swedish Antarctic Expedition 2007-2008　　　　　　　　　　　　　　　
Sugiyama, S, H. Enomoto, S. Fujita
International Symposium on Glaciology in the International Polar Year, 27 Jul. 2009, English, Oral presentation
[International presentation]

Spatial distribution of surface ablation in the terminus part of Rhonegletscher, Switzerland
Takeshi Yoshizawa, Shin Sugiyama, Matthias Huss
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

Inclinometer measurement of borehole deformations in the terminus part in Rhonegletscher, Swiss Alps
Daisuke Nishimura, Shun Tsutaki, Shin Sugiyama
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

Diurnal flow speed variations in Perito Moreno Glacier, Patagonia
Shin Sugiyama, Shun Tsutaki, Nozomu Naito, Hiroyuki Enomoto, Pedro Skvarca
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

Observation on dynamics of Glacier Perito Moreno, southern Patagonia Icefield in 2008/2009
Hiroyuki Enomoto, Nozomu Naito, Shin Sugiyama, Shun Tsutaki, Akira Fukuda, Masamu Aniya, Shinji Isono, Pedro Skvarca
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

Development of glacier-dammed lake and its influence on glacier retreat in Rhonegletscher, Switzerland
Shun Tsutaki, Shin Sugiyama
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

The observation of slab avalanche in February 2009 at Mt. Nitonupuri in Niseko, Japan
Katsumi Yamanoi, Shin Sugiyama, Hitoshi Onishi, Manami Takahashi, Kazuki Nakamura
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

A numerical glacier flow model for the ice core drilling site at Aurora Peak, Alaska
Takehiro Fukuda, Shin Sugiyama, Sumito Matoba, Takayuki Shiraiwa
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, English
2009 - 2009

Modelling the flow regime of the Antarctic drainage system from Dome F to Shirase Glacier　　　　　　　　　　　　　　　
Sugiyama, S, R. Greve, T. Zwinger, H. Seddik
American Geophysical Union Annual Fall Meeting, 15 Dec. 2008, English, Poster presentation
[International presentation]

Sideways ice motion during speed-up events in Gornergletscher, Switzerland　　　　　　　　　　　　　　　
Sugiyama, S, A. Bauder, M. Funk
International Symposium on Dynamics in Glaciology, 17 Aug. 2008, English, Oral presentation
[International presentation]

Snow density and dielectric constant measurements along the Japanese-Swedish Antarctica traverse expedition route
Shin Sugiyama, Hiroyuki Enomoto, Shuji Fujita
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2008, English
2008 - 2008

Evolution of Rhonegletscher in Switzerland over the past 125 years and in the future　　　　　　　　　　　　　　　
Sugiyama, S, C. Zahno, A. Bauder, M. Funk
International Symposium on Cryospheric Indicators of Global Climate Change, 21 Aug. 2006, English, Oral presentation
[International presentation]

Evolution of Rhonegletscher in Switzerland over the past 125 years and in the future: application of an improved flowline model　　　　　　　　　　　　　　　
Sugiyama, S, C. Zahno, A. Bauder, M. Funk
1st Asia CliC Symposium, 20 Apr. 2006, English, Oral presentation
[International presentation]

Glacier dynamics during the outburst flood of a glacier dammed lake on Gornergletscher, Switzerland　　　　　　　　　　　　　　　
Sugiyama, S, M. Funk, B. Mueller, A. Bauder, U. H. Fischer, P. Weiss, M. Huss, N. Deichmann, H. Blatter
European Geosciences Union General Assembly, 25 Apr. 2005, English, Oral presentation
[International presentation]

Laboratory experiment of basal siding　　　　　　　　　　　　　　　
Sugiyama, S, R. Naruse
European Geosciences Union General Assembly, 26 Apr. 2004, English, Oral presentation
[International presentation]

スバルバールKongsvegen氷河における熱水掘削と氷河観測
Aug. 2024, 46139183

グリーンランド北西部カナック地域での氷河・海洋・陸域調査
Jul. 2024, 27685771

チリ・パタゴニア・アマリア氷河における氷河と海洋観測
Jan. 2024, 46253701

グリーンランド北西部カナック地域での氷河・海洋・陸域調査
Jul. 2023 - Aug. 2023, 27685771

Field measurements at Glaciar Grey and Lago Grey in southern Patagonia.
Feb. 2023 - Mar. 2023, 27685669

グリーンランド北西部カナック地域での氷河・海洋・陸域調査
Jul. 2022 - Aug. 2022, 27685771

南極ラングホブデ氷河での熱水掘削
Dec. 2021 - Feb. 2022, 31688139

南パタゴニア氷原ウプサラ氷河での観測
Mar. 2020, 11425808

Glaciological and oceanic fiel measurements in northwestern Greenland
SUGIYAMA Shin, Jun. 2019 - Jul. 2019, 26019601

南パタゴニア氷原グレイ氷河での観測
杉山 慎, Nov. 2018, 11425808

Field research on glaciers and the ocean in the Qaanaaq region, northwestern Greeenland
SUGIYAMA Shin, Jul. 2018 - Aug. 2018, 26019601

Hot water drilling at Langhovde Glacier, East Antarctica
SUGIYAMA Shin, Dec. 2017 - Feb. 2018

グリーンランド北西部カナック周辺での観測
杉山 慎, Jul. 2017 - Aug. 2017, 26019601

南パタゴニア氷原、グレイ氷河での観測
杉山 慎, Mar. 2017, 11425808

グリーンランド北西部カナック周辺での観測
杉山 慎, Jun. 2016 - Aug. 2016, 26019601

ネパールヒマラヤ、トランバウ氷河での観測
杉山 慎, May 2016

南パタゴニア氷原、グレイ氷河での観測
杉山 慎, Jan. 2016 - Feb. 2016, 10667364

グリーンランドボードイン氷河、カナック氷帽、周辺海洋での観測
GRENE雪氷プロジェクト, Jul. 2015

Hot water drilling on Livingston Island, Antarctic Peninsla　　　　　　　　　　　　　　　
科研費, スペイン南極観測プロジェクト, Jan. 2015 - Feb. 2015

グリーンランド、ボードイン氷河とカナック氷帽における観測
GRENE雪氷プロジェクト, Jul. 2014 - Aug. 2014

Field research campaign in the Southern Patagonia Icefield
科研費プロジェクト, Dec. 2013 - Dec. 2013

Field measurements on Bowdoin Gletscher and Qaanaaq Ice Cap, northwestern Greenland
GRENE雪氷プロジェクト, Jun. 2013 - Jul. 2013

Field campaign in the Southern Patagonia Icefield
科研費プロジェクト, Dec. 2012 - Dec. 2012

Field campaign in the northwestern Greenland
GRENE雪氷プロジェクト, Jul. 2012 - Jul. 2012

Field campaign at Langhovde Glacier in Antarctica
第, 次日本南極地域観測隊, 科研費プロジェクト, Dec. 2011 - Feb. 2012

パタゴニア、ペリート・モレノ氷河における調査
科研費プロジェクト, Feb. 2010 - Mar. 2010

ネパールヒマラヤ・ヤラ氷河における調査
科研費プロジェクト, 2009 - 2009

アラスカ・オーロラピークにおける氷コア掘削と氷河調査
科研費プロジェクト, 2008 - 2008, [Others]

南極内陸トラバース調査　　　　　　　　　　　　　　　
次日本南極地域観測隊, 2007 - 2008

Unraveling spatio-temporal variations of the Antarctic ice sheet mass balance and its governing mechanisms
Grants-in-Aid for Scientific Research
01 Apr. 2024 - 31 Mar. 2029
庭野 匡思, 杉山 慎, 箕輪 昌紘, 津滝 俊
Japan Society for the Promotion of Science, Grant-in-Aid for Transformative Research Areas (A), Japan, Meteorological Research Institute, 24H02342

グローバル南極学：大変化する氷床と地球環境の連鎖をつなぐ
科学研究費助成事業
01 Apr. 2024 - 31 Mar. 2029
青木 茂, 奥野 淳一, 猪上 淳, 庭野 匡思, 杉山 慎, 草原 和弥, 関 宰, 平野 大輔, 小野 数也, 真壁 竜介, 巻 俊宏, 岡 顕, 野木 義史, 川村 賢二
日本学術振興会, 学術変革領域研究(A), 北海道大学, 24H02339

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
科学研究費助成事業
Apr. 2024 - Mar. 2029
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
日本学術振興会, 基盤研究(A), 千葉大学, Competitive research funding, 24H00260

Acoustic monitoring of Arctic top predators under abrupt climate change
科学研究費助成事業
01 Apr. 2024 - 31 Mar. 2028
Podolskiy Evgeny, 三谷 曜子, 杉山 慎, 深町 康, 長谷川 浩平
日本学術振興会, 基盤研究(B), 北海道大学, 24K02093

Glacier, grounding line and ice shelf dynamics: the driver of the rapid mass loss of the Antarctic ice sheet
第Ⅹ期南極地域観測事業観測課題
Apr. 2022 - Mar. 2028
奈良間千之, 箕輪昌紘, 澤柿教伸, 庭野匡思, 山之口勤, 中村和樹, 青山雄一
国立極地研究所, 重点研究観測, Principal investigator

温暖化するパタゴニアでピオ・オンセ氷河が拡大するのはなぜか？
科学研究費助成事業
Sep. 2024 - Mar. 2027
杉山 慎、漢那直也、波多俊太郎、近藤研
日本学術振興会, 国際共同研究加速基金(海外連携研究), 北海道大学, Principal investigator, 24KK0192

Multi-scale and multi-method assessment of rapid glacier and ice sheet changes in the Arctic
北極域研究加速プロジェクト（ArCS Ⅱ） 海外研究力強化プログラム
Apr. 2021 - Mar. 2025
Thomas Schuler、Ralf Greve、古屋正人、Evgeny Podolskiy
文部科学省, 海外交流計画, Principal investigator

北極域における沿岸環境の変化とその社会影響
ArCS II（環境技術等研究開発推進事業費補助金）
Jun. 2020 - Mar. 2025
文部科学省, 国立極地研究所・海洋研究開発機構・北海道大学, Principal investigator

Ice front processes and evolution mechanisms of calving glaciers -comparison between lake- and ocean terminating glaciers-
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Apr. 2020 - Mar. 2025
杉山 慎
前年度に引き続き、2021年度もCOVID-19の影響を受けて、チリおよびアルゼンチンでの氷河観測が実施できない状況となった。そこで当初の計画を一部変更して、南極における野外観測を実施すると共に、人工衛星データを使った解析に力を入れた。その結果、南極のカービング氷河における重要な観測データが得られた他、既存のデータと衛星データの解析で論文出版と学会発表の成果が挙がった。
(1) 野外観測： 2021年12月から2022年1月にかけて、南極ラングホブデ氷河で熱水掘削を含む観測を実施して、カービング氷河の底面観測に成功した。当初計画とは異なる地域、異なる手法による観測であるが、氷河氷床と海洋の相互作用解明につながる重要なデータが得られたと考えている。このほか、パタゴニアでの氷河・氷河湖・海洋調査に向けて、観測機器の調査と準備を行った。特にマルチビームソナーを使った観測に関して、専門業者への観測委託の検討が進んだ。
(2) データ解析： 過去にチリ・グレイ氷河の前縁湖で測定した水温と流速データを解析して、氷河排水が氷河湖の水温季節変動に与える影響を明らかにした。また人工衛星データの解析によって、パタゴニア西部グレーベ湖で2020年に起きた急激な水位低下を発見した。詳しい解析の結果、この現象が近年では世界最大の氷河湖排水イベントであることが判明した。
(3) 論文出版・学会発表：グレイ湖で測定した通年の水温変化をNature Communications誌に出版した他、氷河湖排水イベントをCommunications Earth & Environment誌に投稿中。COVID-19の影響で海外における学会発表は困難となり、国内での学会で成果を発表した。
(4) 研究会合：10月にオスロ大学の研究者とオンラインでワークショップを開催した他、研究チームでの小規模な会合を適宜開催した。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 20H00186

The transition from marine- to land-terminating glaciers in Qaanaaq, NW Greenland　　　　　　　　　　　　　　　
UK – Japan Arctic Research Bursaries Scheme 2024-25
2024 - 2025
Jenna Sutherland, Shin Sugiyama
Natural Environment Research Concil, UK, Leeds Beckett University, Hokkaido University, Coinvestigator

Variations and interactions of climate and the Antarctic Ice Sheet
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Jun. 2017 - Mar. 2022
川村 賢二, 植村 立, 本山 秀明, 杉山 慎, 澤柿 教伸
＜氷床コア関連＞ドームふじ氷床コアの各分析やデータ解析により環境復元や変動メカニズム解析を進めるとともに、同コアと他のアイスコアや海底コアとの年代統合や環境復元に関するデータをさらに蓄積した。特に、約12万年前や約40万年前の間氷期について、ドームふじコアの気体分析や取得済みデータの解析を進め、精密年代統合に寄与するデータを得た。最終間氷期前の氷期最寒期を対象に、ドームふじコアのメタン濃度及びO2同位体比の詳細データから、間氷期に至る退氷の始まりを示す可能性のある変化を見出した。ダストやエアロゾルに関する各種分析・解析の結果は複数の論文として出版した。CO2濃度復元を目的とした切削法抽出装置を組み上げ、テスト分析が可能になった。ドームふじコアの年代軸の刷新に向けた年代モデルにかかる共同研究も進めた。フィルン空気や積雪の分析なども引き続き進め、氷床コアへの環境情報記録プロセスの研究も進めた。
＜広域雪氷観測＞東南極ドロンニングモードランド（DML）地域の表面質量収支の時空間変動を明らかにするため、1990年代から取得されてきた雪尺等の観測データの解析（データの代表性や不確実性検討、モデル班や公募班との連携）を進めた。昨シーズンの国際共同観測(日本、米国、ノルウェー)を含む内陸の雪氷観測データについて、基盤地形の精緻化や氷床流動、表面質量収支に着目して解析を進めた。
＜氷河・海洋観測＞ラングホブデ氷河に初年度に観測した棚氷下の海洋データと、棚氷下に設置した係留系から通年で得られたデータを解析し、季節・経年変化を含めた底面融解の理解を進めた。人工衛星データや気象データの解析、他班との意見交換を通じ、海洋変化と氷床変動の関係や、氷床融解が海洋環境にもたらす影響の検討を進めた。棚氷下で採取した海水や海底堆積物の分析を実施した。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), National Institute of Polar Research, Coinvestigator, 17H06320

氷床・海氷縁辺 域の総合観測から迫る大気-氷床-海洋の相互作用
南極地域観測第9期重点研究観測
Apr. 2017 - Mar. 2022
文部科学省・国立極地研究所, 北海道大学・国立極地研究所・他, Coinvestigator

Projecting discharge from the Greenland ice sheet using climatic forcings derived from atmosphere-ocean models
Grants-in-Aid for Scientific Research
01 Apr. 2016 - 31 Mar. 2020
Greve Ralf
We conducted future-climate simulations for the Greenland ice sheet with the SICOPOLIS model, driven by atmospheric and oceanic forcings produced by an ensemble of global climate models (including MIROC). The simulated sea-level contribution of the Greenland ice sheet for the period 2015–2100 is 133.0 ± 40.7 mm for the RCP8.5/SSP5-8.5 pathway that represents continued emissions of greenhouse gases, and it is 48.6 ± 6.2 mm for the RCP2.6/SSP1-2.6 pathway that represents ambitious emissions reductions. Further, we constructed a new geothermal heal flux map for Greenland, simulated the impact of an observed basal mega-canyon on subglacial water flow, and investigated the local dynamics of Bowdoin Glacier and the NEEM ice core.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 16H02224

Freshwater discharge from the Kamchatka Peninsula controls Pan-Okhotsk land-ocean linkage system
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Apr. 2017 - Mar. 2020
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.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 17H01156

パタゴニアにおけるカービング氷河末端と湖との相互作用
科学研究費補助金（基盤B・海外学術）
Apr. 2016 - Mar. 2020
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

グリーンランドにおける氷河氷床・海洋相互作用
ArCS北極域研究推進プロジェクト
Oct. 2015 - Mar. 2020
文部科学省

Investigation of state and fluctuation mechanisms of glaciers in high mountain Asia
Grants-in-Aid for Scientific Research
01 Apr. 2014 - 31 Mar. 2018
Fujita Koji, SAKAI Akiko, Kayastha Ri jan B.
To better understand fluctuations and their mechanisms of large glaciers in high mountain Asia, we conducted in-situ observations in the Nepal and Bhutan Himalayas with analyses of remotely sensed satellite data and of numerical modelling. We developed a numerical model for debris-covered glaciers, in which distribution of debris thermal resistance was estimated with remotely sensed data as a proxy of debris thickness, and then ice melting was calculated by considering heat balance. By analyzing high resolution remotely sensed satellite data, we revealed mass changes in a couple of Himalayan glaciers. In addition, we compiled glacier inventory covering high mountain Asia, and then revealed areal changes in glaciers in the eastern Himalayas. We also revealed that debris-cover extent was highly correlated with upper glacier-free slope facing southwest at which diurnal freeze-thaw cycle could produce and supply debris material on glacier.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Nagoya University, 26257202

カービング氷河末端における氷融解量の直接測定
科学研究費補助金（挑戦的萌芽研究）
Apr. 2014 - Mar. 2017
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

地震波探査によるカービング氷河高速流動メカニズムの解明
科学研究費助成事業
24 Apr. 2015 - 31 Mar. 2016
杉山 慎, PODOLSKIY EVGENY
Recent dramatic retreat and mass-loss of glaciers is one of the most evident consequences of the climate change. Among the least understood elements of glacier dynamics, related to mass-loss of fast flowing ocean-terminating glaciers, are difficult-to-access englacial / basal processes, and evolution of ice fractures ultimately leading to major iceberg collapse and thus to further retreat of glaciers. Sound waves produced by some of these processes and propagating through ice/rock and air can be monitored and used to understand otherwise unreachable rapid phenomena. Such in situ records were obtained during a comprehensive international expedition to the Bowdoin Glacier, Greenland in 2015. Analysis revealed the mechanisms of tide-modulated seismicity (as a proxy for ice fracturing temporary patterns) and were recently published [Podolskiy et al., GRL, 2016]. We also note, that in order to accommodate new circumstances of the fellow and a possibility of an early termination of the fellowship for starting a new job as an Assistant Professor in Dec 2015, the geographical location of the initially proposed glacier had to be changed from Patagonia to Greenland. Otherwise it would be impossible to conduct summer field work before the early end of the fellowship (summer campaign in southern hemisphere was supposed to take place in Jan-Feb 2016; while for Greenland it was possible to held in Jul-Aug 2015). Despite this change, objectives of the study remained principally intact and were focused on seismic observations for understanding glacier dynamics, as initially proposed.
日本学術振興会, 特別研究員奨励費, 北海道大学, 15F15901

Detection of marginalfluctuation of the Antarctic ice sheet of the past half-century by multi- temporal stereo images.
Grants-in-Aid for Scientific Research
01 Apr. 2013 - 31 Mar. 2016
SAWAGAKI Takanobu, MOTOYAMA HIDEAKI, SUGIYAMA SHIN, MIURA HIDEKI, SAITO TAKASHI
This study aims to detect in the marginal fluctuation of the Antarctic ice sheets of the past 45 years long the Soya Coast, by comparison of two types of digital elevation models of aerial photographs and satellite images. As a result, the catalog of the stereo pair images of since the 1960s, covering this region has been completed. The actual result of the analysis of the surface elevation change and the terminus position of the Langhovde glaciers shows that its terminal position is retreated significantly from 1975 to 2007, while surface elevation was slightly increased or steady state.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), 25350415

Effects of snow impurities and glacial microbes on abrupt warming in the Arctic
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2016
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.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), Japan, Meteorological Research Institute, 23221004

Study on hydraulic conditions for sudden acceleration in retreat of calving glaciers
Grants-in-Aid for Scientific Research
01 Apr. 2012 - 31 Mar. 2015
NAITO Nozomu, SUGIYAMA Shin, SAWAGAKI Takanobu
We carried out field observations on the Glaciar Perito Moreno, Patagonia in the South America. From those results, annual variations in location of the glacier terminus, distribution of the terminal flow speed, and ice thickness of the glacier ablation area, are revealed. We, however, have not yet accomplished to investigate hydraulic correlations between the glacier terminal / ice thickness variations and water pressure of the proglacial lake evaluated from the lake depth data, unfortunately. Nevertheless, we have stored precious data set for the glacier, those have been seldom obtained on other calving glaciers. We are convinced that our data set should contribute to clarify mechanism of calving glaciers’ variations through continuing the analysis.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hiroshima Institute of Technology, 24540474

カービング氷河の急激な後退に氷河流動が果たす役割　　　　　　　　　　　　　　　
科学研究費補助金（基盤研究B）
2011 - 2015
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

Role of ice dynamics in rapid retreat of calving glaciers　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research
2011 - 2015
Competitive research funding

Simulations of the evolution and dynamics of the Antarctic ice sheet in past and future climates
Grants-in-Aid for Scientific Research
01 Apr. 2010 - 31 Mar. 2014
GREVE Ralf, ABE-OUCHI Ayako, SUGIYAMA Shin, FUJITA Shuji, MOTOYAMA Hideaki, SAITO Fuyuki
We investigated the evolution and dynamics of the Antarctic ice sheet and, complementarily, of the Greenland ice sheet, in changing climates in the past and future by numerical modelling. An interesting finding was that at the Last Glacial Maximum 20,000 years ago the total area of the floating ice shelves of Antarctica was smaller than today, but the total amount of basal melting under the ice shelves was significantly larger. We participated in the international community effort SeaRISE and assessed the likely contribution of the Antarctic and Greenland ice sheets to sea level rise under a variety of future climate scenarios. For the strongest RCP 8.5 "business as usual" scenario, the model-averaged values were approximately 0.1 m after 100 years and 1.5 m after 500 years for Antarctica, and 0.2 m after 100 years and 2.0 m after 500 years for Greenland. These results served as input for the Fifth Assessment Report of the Intergovernmental Panel on Climate Change IPCC.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 22244058

南極沿岸における溢流氷河の短期流動変化　　　　　　　　　　　　　　　
科学研究費補助金（挑戦的萌芽研究）
2011 - 2014
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

Short term flow speed variations in an Antarctic outlet glacier　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research
2011 - 2013
Competitive research funding

東南極ラングホブデ氷河における熱水掘削
南極地域観測第8期一般研究観測
2010 - 2012
杉山 慎
国立極地研究所, Principal investigator, Competitive research funding

Hot water drilling at Langhovde Glacier, East Antarctica　　　　　　　　　　　　　　　
0100 (Japanese Only)
2010 - 2012
Competitive research funding

氷河湖の形成に起因した氷河後退メカニズムの解明　　　　　　　　　　　　　　　
科学研究費補助金（基盤研究C）
2008 - 2011
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

Physical mechanisms for formation of strata at the surface of the ice sheet in the interior of the Antarctic ice sheet, and remote sensing for them with radio waves
Grants-in-Aid for Scientific Research
2008 - 2010
FUJITA Shuji, FUKUI Kotaro, KAWAMURA Kenji, AZUMA Kumiko, SURDYK Sylviane, ENOMOTO Horoyuki, NAKAZAWA Fumio, SUGIYAMA Shin, MIYAMOTO Atsushi, IIZUKA Yoshinori, HORI Akira, NISHIMURA Daisuke
Using the snow/firn samples and data obtained by traversing the interior of the Antarctic ice sheet, we studied physical mechanisms of the formation of the strata within snow and firn. Major findings include spatial distribution of the depositional environment in Antarctica, seasonal effects on firn density and spatial distribution of the subglacial environment. In addition, we found that polarization ratio of the microwave emissivity from the ice sheet surface is well correlated to accumulation rate observed by radar sounding.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), National Institute of Polar Research, 20241007

Reconstruct of depositions of terrestrial materials into the northern North Pacific by ice-core analysis
Grants-in-Aid for Scientific Research
2007 - 2009
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.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Research Institute for Humanity and Nature, 19340137

Mechanism of Glacier Variations and Elucidation of the Holocene Environment in Patagonia Icefield, South America.
Grants-in-Aid for Scientific Research
2006 - 2009
ANIYA Masamu, ENOMOTO Hiroyuki, AOKI Tatsuto, HORI Kazuaki, ANMA Ryo, MARUOKA Teruyuki, NAITO Nozomu, FUJITA Koji, MATSUMOTO Takane, SUGIYAMA Shinn
(1) At Perito Moreno Glacier of the Southern Patagonia Icefield, we measured the glacier surface heights, glacier flow velocity, and calving speed, and long-term temperature at the upper reach.We drilled 510m boreholes with a hotwater drill.Three LIA advances in 15C, 17C and 19C were recognized. (2) The fan deltas distributed on the eastern side of the Northern Patagonia Icefield were investigated. Variations of 21 outlet glaciers of the NPI between 2004/5 and 2008/9 resulted in a total area loss of 5.8 km^2. (3) With the JAMSTEC's research ship [Mirai] we cored sea floor sediments at the offshore of the NPI.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), University of Tsukuba, 18251002

Induced anisotropy, fast ice flow and climate change in ice sheets
Grants-in-Aid for Scientific Research
2006 - 2008
GREVE R・G
This project dealt with two hot topics in current climatological research on ice sheets, induced anisotropy and fast ice flow, by means of numerical modelling. A new versatile, three-dimensional computer model "Elmer/Ice" for flowing ice masses was developed, which solves the full-Stokes equations. Within Elmer/Ice, induced anisotropy is described by the "CAFFE model". The CAFFE model was applied to the site of the EDML ice core at Kohnen Station in east Antarctica, for which the measured surface velocity and fabrics profile could be reproduced well. Elmer/Ice with the CAFFE model was applied to a 200×200km window around the Dome Fuji ice core in central east Antarctica. The main findings of the simulations were : (i)the flow regime at Dome Fuji is a complex superposition of vertical compression, horizontal extension and bed-parallel shear ; (ii)for a geothermal heat flux of 60mW m^<-2> the basal temperature at Dome Fuji reaches the pressure melting point ; (iii)the fabric shows a weak single maximum at Dome Fuji ; (iv)the basal age is smaller where the ice is thicker and larger where the ice is thinner. As a spin-off study, Elmer/Ice was also applied to the Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, which is characterized by an unusually large aspect ratio and a very high geothermal heat flux. Simulations of the Greenland ice sheet were carried out with R. Greve's ice-sheet model SICOPOLIS. It was found that(i)the present-day North-East Greenland Ice Stream(NEGIS)shows basal sliding enhancement by the factor three compared to the surrounding, slowly flowing ice, and(ii)ice-dynamical processes(basal sliding accelerated by surface meltwater)can speed up the decay of the ice sheet significantly, but not catastrophically in the 21st century and beyond. Modelling with Elmer/Ice of the flow regime of the Antarctic drainage system from Dome Fuji to Shirase Glacier is still ongoing. One doctoral thesis(Mr. Hakime Seddik)and one master thesis(Ms. Shoko Otsu)were completed at Hokkaido University within this project.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18340135

高精度氷河変動モデルの構築　　　　　　　　　　　　　　　
科学研究費補助金（若手研究）
2006 - 2008
杉山 慎
日本学術振興会, Principal investigator, Competitive research funding

南極氷床 ―地球最大の氷に何が起きているか―
08 Mar. 2024
Lecturer
カーボン・ニュートラル・オフィサー育成プログラム 「環生塾」
環生塾WEB特別セミナー
36716324

南極氷床 ～地球最大の氷に何が起きているのか～
22 Feb. 2024
Lecturer
Lecture
公益社団法人 精密工学会 成形プラスチック歯車研究専門委員会
第155回研究会・総会・技術・特別講演
36716324

雪について調べてみよう　　　　　　　　　　　　　　　
09 Feb. 2024
Lecturer
Visiting lecture
札幌市立大倉山小学校

山岳氷河の縮小が加速している　　　　　　　　　　　　　　　
13 Dec. 2023
Lecturer
Lecture
Future Earth国際事務局日本ハブ、長崎大学、国立環境研究所
気候変動について今伝えたい、10の重要なメッセージ ～10 NEW INSIGHTS IN CLIMATE SCIENCE～

雪について調べてみよう　　　　　　　　　　　　　　　
16 Feb. 2023
Lecturer
Visiting lecture
札幌市立大倉山小学校

氷河氷床－地球を覆う氷に何が起きているのか－　　　　　　　　　　　　　　　
17 Dec. 2022
Lecturer
Lecture
愛知県青年海外協力隊を支援する会
愛知県青年海外協力隊を支援する会 開発教育セミナー

南極氷床 ―地球最大の氷に何が起きているか―　　　　　　　　　　　　　　　
12 Dec. 2022
Lecturer
Lecture
東京鯱光会

南極の氷に何が起きているか　　　　　　　　　　　　　　　
10 Dec. 2022
Lecturer
Lecture
専修大学・自然科学研究所

南極氷床 ―地球最大の氷に何が起きているのか―　　　　　　　　　　　　　　　
19 Nov. 2022
Lecturer
Visiting lecture
金沢市・星稜高等学校

南極氷床 ー地球最大の氷のかたまりー　　　　　　　　　　　　　　　
06 Nov. 2021
Lecturer
Lecture
北海道大学大学祭全学実行委員会
北大祭公開講座

氷河氷床 －地球を覆う氷に何が起きているのか？－
03 Nov. 2021
Lecturer
Lecture
中央大学，環境社会・国際環境保全ゼミ
27685771

雪について調べてみよう　　　　　　　　　　　　　　　
12 Feb. 2021
Lecturer
Visiting lecture
札幌市立大倉山小学校

南極氷床 －地球でいちばん大きな氷のかたまり－　　　　　　　　　　　　　　　
12 Dec. 2020
Lecturer
Lecture
愛知淑徳大学創造表現学会
SNS講演会

Glacier and ice sheet　　　　　　　　　　　　　　　
25 Nov. 2020
Lecturer
Lecture
北極域研究共同推進拠点
２

雪について調べてみよう
14 Feb. 2020
Lecturer
Visiting lecture
札幌市立大倉山小学校
Schoolchildren

Cryosphere　　　　　　　　　　　　　　　
17 Jan. 2020
Lecturer
Lecture
立命館慶祥高校
立命館慶祥高校 SSH国際交流研究室訪問

Glaciers and ice sheets　　　　　　　　　　　　　　　
11 Oct. 2019
Lecturer
Lecture
立命館慶祥高等学校
SSH事業 北海道大学訪問

氷河・氷床 －北極を彩る氷のかたまり－　　　　　　　　　　　　　　　
09 Oct. 2019
Lecturer
Lecture
北極域研究共同推進拠点(J-ARC Net)
北極基礎市民講座

南極氷床 －地球最大の氷のかたまり－　　　　　　　　　　　　　　　
01 Oct. 2019
Lecturer
Lecture
（公財）北海道女性協会
2019年度第2期えるのす連続講座～女性大学～

札幌藻岩高等学校「環境教育講座」　　　　　　　　　　　　　　　
13 Sep. 2019
Lecturer, Advisor
Seminar
札幌藻岩高等学校
環境教育講座

The Antarctic ice sheet　　　　　　　　　　　　　　　
27 May 2019
Lecturer
Lecture
JPGU
JPGU2019ショートセミナー

ARCTIC LIFE 〜極北の狩⼈と雪氷学者を囲んで　　　　　　　　　　　　　　　
23 Feb. 2019
Lecturer
Lecture
⽇本科学未来館、北海道⼤学低温科学研究所、北極域研究推進プロジェクト（ArCS）
日本科学未来館トークセッション

グリーンランドの自然環境と狩猟文化　　　　　　　　　　　　　　　
17 Feb. 2019
Lecturer
Lecture
紋別市
第34回北方圏国際シンポジウム

グリーンランドの自然環境　　　　　　　　　　　　　　　
15 Feb. 2019
Lecturer
Lecture
北海道大学・低温科学研究所、アイヌ・先住民研究センター、北極域研究センター ・ArCSプロジェクト
グリーンランドとアイヌの狩猟文化：環境保全と文化継承の取り組みから

雪について調べてみよう　　　　　　　　　　　　　　　
12 Feb. 2019
Lecturer
Visiting lecture
札幌市立大倉山小学校

立命館慶祥SSH 国際交流研究室訪問　　　　　　　　　　　　　　　
05 Feb. 2019
Lecturer
Open college
立命館慶祥高等学校

グリーンランド ―自然環境の変化とその人間生活への影響―　　　　　　　　　　　　　　　
15 Dec. 2018
Lecturer
Lecture
日本科学未来館、北極域研究推進プロジェクト（ArCS)
トークセッション「どうなる？ 北極 ～人と自然が織りなす北の叙事詩」

サイエンススクール ～五感で感じる南極体験～　　　　　　　　　　　　　　　
17 Aug. 2018
Lecturer
Seminar
KDDI、北海道大学

氷河 ─地球を彩る氷─　　　　　　　　　　　　　　　
31 Oct. 2017
Lecturer
Lecture
北海道立女性プラザ
平成29年度第2期女性大学

圧巻！極北の大瀑布 ノルウェースバールバル諸島　　　　　　　　　　　　　　　
21 Oct. 2017
Advisor
Media report
NHK
グレートネイチャー

ののちゃんdo科学「氷山と流氷」　　　　　　　　　　　　　　　
14 Oct. 2017
Informant
Paper
朝日新聞

南極氷床 －地球最大の氷のかたまり―　　　　　　　　　　　　　　　
22 May 2017 - 22 May 2017
Lecturer
Visiting lecture
立命館慶祥高等学校
SSH特別授業「サイエンスチャージ」

科学の扉「極地の氷消える時」　　　　　　　　　　　　　　　
07 May 2017
Informant
Paper
朝日新聞

「雪について調べよう」　　　　　　　　　　　　　　　
01 Feb. 2017
Lecturer
Visiting lecture
札幌市立大倉山小学校

Music, Adventure and Science on Greenland　　　　　　　　　　　　　　　
07 Nov. 2016
Presenter, Planner
Lecture
Hokkaido Univeristy ILTS, ARC, MUSIC PLANT
Hokkaido University Sustainability Week

グリーンランド氷床 北極最大の氷のかたまりに何が起きているか　　　　　　　　　　　　　　　
02 Oct. 2016
Panelist, Lecturer
Lecture
雪氷研究大会公開講演会「極地からの緊急報告！ 温暖化がすすむ南極とグリーンランドに迫る」

氷河氷床 地球の氷に何が起きているのか？　　　　　　　　　　　　　　　
26 Sep. 2016
Lecturer
Lecture
低温科学研究所公開講座「広がる低温の魅力 低温科学の最前線」

GRENEプロジェクト 公開講演会　　　　　　　　　　　　　　　
05 Mar. 2016
Panelist
Lecture
国立極地研究所・JAMSTEC・北海道大学
北極温暖化の実態と影響～何がわかったか、これから何をするのか～

ポプラ広場「地球温暖化最前線 スイスアルプスの氷河と地球の未来」　　　　　　　　　　　　　　　
18 Feb. 2016
Lecturer
Lecture
朝日新聞北海道支社、北海道テレビ放送

「雪について調べよう」　　　　　　　　　　　　　　　
15 Jan. 2016
Lecturer
Visiting lecture
大倉山小学校

札幌立命館慶祥高校SSH大学研修　　　　　　　　　　　　　　　
13 Jun. 2015 - 13 Jun. 2015
Lecturer
低温科学研究所・立命館慶祥高校

北海道大学インフォメーションセンター公開展示　　　　　　　　　　　　　　　
Mar. 2015 - May 2015
Informant, Planner
Open college
低温科学研究所・北海道テレビ（HTB）

公開講演会 富山に北極がやって来た！　　　　　　　　　　　　　　　
26 Apr. 2015
Panelist
Lecture
国立極地研究所ほか
北極科学サミット週間(Arctic Science Summit Week)

ポプラ広場「地球温暖化最前線 南米パタゴニアの氷河と地球の未来」　　　　　　　　　　　　　　　
19 Mar. 2015
Lecturer
Lecture
朝日新聞北海道支社、北海道テレビ放送

「雪について調べよう」　　　　　　　　　　　　　　　
09 Mar. 2015
Lecturer
Visiting lecture
大倉山小学校

「いちめんのひょうが ～南極で氷河の底をのぞく～」
25 Sep. 2014
Lecturer
Science cafe
北海道大学
札幌国際芸術祭「北大アーティストカフェ」

旭川西高等学校SSH大学研修　　　　　　　　　　　　　　　
24 Apr. 2014
Lecturer
Open college
低温科学研究所

「グリーンランドで氷河・氷床に起きていること」
15 Mar. 2014 - 15 Mar. 2014
Lecturer
Lecture
北極環境研究コンソーシアム／国立極地研究所
公開講演会「遠くて近い北極 －ここまでわかった温暖化－」

「雪について調べよう」　　　　　　　　　　　　　　　
25 Feb. 2014
Lecturer
Visiting lecture
大倉山小学校

「スペースシップアースの未来 」　　　　　　　　　　　　　　　
17 Jan. 2014
Informant
Media report
NHK

「南極・北極の氷床に何が起きているか」　　　　　　　　　　　　　　　
26 Nov. 2013
Lecturer
Lecture
北海道大学
遠友学舎夜学校

「グリーンランドの氷床を探る」　　　　　　　　　　　　　　　
12 Nov. 2013
Report writing
Paper
朝日新聞
北の文化

「氷の大地グリーンランド －北極最大の氷のかたまりに何が起きているのか－」　　　　　　　　　　　　　　　
03 Nov. 2013
Lecturer
北海道テレビ・北海道大学総合博物館・低温科学研究所
白夜の北極・グリーンランド展 市民セミナー

「南極氷床 ～氷の底を覗いてみたら～」　　　　　　　　　　　　　　　
11 Aug. 2013
Lecturer
愛媛県総合科学博物館
特別展「南極の自然」

「南極氷床」　　　　　　　　　　　　　　　
08 Jun. 2013
Lecturer
Visiting lecture
札幌立命館慶祥高校
スーパーサイエンスハイスクール

「日本隊とスウェーデン隊の南極旅行術」　　　　　　　　　　　　　　　
25 Sep. 2012
Lecturer
Lecture
日本雪氷学会
雪氷研究大会 公開シンポジウム「南極の食生活いまむかし」

南極氷床 - 地球でいちばん大きな氷のかたまり」　　　　　　　　　　　　　　　
25 Aug. 2012
Lecturer
Lecture
北海道大学総合博物館
南極フロンティア展

氷河氷床と気候変動　　　　　　　　　　　　　　　
15 Nov. 2011
Lecturer
Seminar
札幌管区気象台

宙と陸から観る 氷河・氷床の今　　　　　　　　　　　　　　　
30 Oct. 2011
Lecturer
Lecture
北海道大学
GiFT 北海道大学から世界へ未来へ

南極氷床 — 雪と氷の大陸が地球環境に果たす役割 —　　　　　　　　　　　　　　　
30 Oct. 2010
Panelist, Lecturer
Lecture
札幌管区気象台、稚内地方気象台
地球環境シンポジウム 「どう変わる 私たちの住む宗谷 私たちの住む地球 稚内と南極から見つめる地球環境」

「エウレカ！北大」アフリカ経験糧に氷河研究　　　　　　　　　　　　　　　
11 Jan. 2023
読売新聞

南極の氷損失 研究に脚光
16 Sep. 2022
北海道新聞
31688139, [Paper]

北大教授杉山さん講談社科学出版賞　　　　　　　　　　　　　　　
22 Jul. 2022
北海道新聞

流れ出す氷河に迫る 熱水掘削し過程観測、氷床融解予測に活用　　　　　　　　　　　　　　　
09 Jan. 2022
共同通信社
岩手日報その他

「南極の氷に何が起きているか 気候変動と氷床の科学」＝杉山慎・著　　　　　　　　　　　　　　　
08 Jan. 2022
毎日新聞

グリーンランドで氷河の融解が21世紀に入って急加速したことが判明　　　　　　　　　　　　　　　
13 Dec. 2021
共同通信社

グリーンランド氷河、21世紀以降に急速に融解 北大解析
18 Nov. 2021
日刊工業新聞
27685771

最北の陸地に世界が注目・グリーンランドの北に新たに発見　　　　　　　　　　　　　　　
08 Oct. 2021
Other than myself
朝日新聞
朝日小学生新聞
[Paper]

プロジェクト最前線「氷河わずかな動き測定」
23 Aug. 2021
日経新聞
27685771, [Paper]

10YearsAfter未来への分岐点　　　　　　　　　　　　　　　
Jan. 2020
NHK
NHKスペシャル
[Media report]

波乱の北極カメラ回収　　　　　　　　　　　　　　　
30 Sep. 2018
日本テレビ 所さんの目がテン！
[Media report]

～グリーンランドの科学～　　　　　　　　　　　　　　　
Jul. 2017
日本テレビ
所さんの目がテン！
[Media report]

とけてゆくスイス「氷河×光×地球の未来」　　　　　　　　　　　　　　　
11 Feb. 2016
北海道テレビ放送
[Media report]

「パタゴニア 氷河×風×地球の未来」
11 Feb. 2015
北海道テレビ放送
[Media report]

氷の下に海水が！ 南極・氷床融解の謎
19 Sep. 2014
JST科学技術振興機構
サイエンスチャンネル
[Internet]

「地球変動氷点下で探る」　　　　　　　　　　　　　　　
06 Feb. 2014
日経新聞
[Paper]

「氷の島のメッセージ 温暖化の最前線から」
04 Nov. 2013
北海道テレビ
[Media report]

「珍種だらけ！南極大陸に秘密の楽園」
19 May 2013
NHK
サイエンスゼロ
[Media report]