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

Sugiyama, Shin; Navarro, Francisco J.; Sawagaki, Takanobu; Minowa, Masahiro; Segawa, Takahiro; Onuma, Yukihiko; Otero, Jaime; Vasilenko, Evgeny V.

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

Sugiyama, Shin; Navarro, Francisco J.; Sawagaki, Takanobu et al.

Journal of glaciology, 2019, 65(252), 689-699

Permalink : https://hdl.handle.net/2115/75749

このアイテムのアクセス数:754件（2026-08-17 20:02 集計）

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https://doi.org/10.1017/jog.2019.45			18

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アクセス権	open access
URI	https://hdl.handle.net/2115/75749
タイトル	Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula
著者	Sugiyama, Shin ; Navarro, Francisco J. ; Sawagaki, Takanobu ; Minowa, Masahiro ; Segawa, Takahiro ; Onuma, Yukihiko ; Otero, Jaime ; Vasilenko, Evgeny V.
e-Rad_Researcher 20421951 著者名 Sugiyama, Shin
著者名 Navarro, Francisco J.
e-Rad_Researcher 70312410 著者名 Sawagaki, Takanobu
著者名 Minowa, Masahiro
著者名 Segawa, Takahiro
著者名 Onuma, Yukihiko
著者名 Otero, Jaime
著者名 Vasilenko, Evgeny V.
言語	英語
キーワード	Antarctic glaciology
	glacier flow
	ice temperature
	ice velocity
	subglacial processes
発行日	2019-08
出版者	Cambridge University Press
収録物名	Journal of glaciology
巻(号)	65(252)
ページ	689-699
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
PISSN	0022-1430
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1017/jog.2019.45