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Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula

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Title: Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Navarro, Francisco J. Browse this author
Sawagaki, Takanobu Browse this author →KAKEN DB
Minowa, Masahiro Browse this author
Segawa, Takahiro Browse this author
Onuma, Yukihiko Browse this author
Otero, Jaime Browse this author
Vasilenko, Evgeny V. Browse this author
Keywords: Antarctic glaciology
glacier flow
ice temperature
ice velocity
subglacial processes
Issue Date: Aug-2019
Publisher: Cambridge University Press
Journal Title: Journal of glaciology
Volume: 65
Issue: 252
Start Page: 689
End Page: 699
Publisher DOI: 10.1017/jog.2019.45
Abstract: To study subglacial hydrological condition and its influence on the glacier dynamics, we drilled Johnsons Glacier on Livingston Island in the Antarctic Peninsula region. Subglacial water pressure was recorded in boreholes at two locations over 2 years, accompanied by high-frequency ice-speed measurements during two summer melt seasons. Water pressure showed two different regimes, namely high frequency and large amplitude variations during the melt season (January-April) and small fluctuations near the overburden pressure the rest of the year. Speed-up events were observed several times in each summer measurement period. Ice motion during these events substantially contributed to total glacier motion, for example, fast ice flow over 1 week accounted for similar to 70% of the total displacement over a 25-day long measurement period. We did not find a clear relationship between subglacial water pressure and ice speed. This was probably because subglacial hydraulic conditions were spatially inhomogeneous and thus our borehole data did not always represent a large-scale subglacial condition. Ice temperature measurements in the boreholes confirmed the existence of a cold ice layer near the glacier surface. Our data provide a basis to better understand the dynamic and hydrological conditions of relatively unstudied glaciers in the Antarctic Peninsula region.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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