Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula
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 measure...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/75749 2023-05-15T13:51:33+02:00 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. http://hdl.handle.net/2115/75749 https://doi.org/10.1017/jog.2019.45 eng eng Cambridge University Press http://hdl.handle.net/2115/75749 Journal of glaciology, 65(252): 689-699 http://dx.doi.org/10.1017/jog.2019.45 https://creativecommons.org/licenses/by/4.0/ CC-BY Antarctic glaciology glacier flow ice temperature ice velocity subglacial processes 450 article fthokunivhus https://doi.org/10.1017/jog.2019.45 2022-11-18T01:05:38Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Journal of Glaciology Livingston Island Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Antarctic Peninsula Johnsons ENVELOPE(-60.350,-60.350,-62.665,-62.665) Johnsons Glacier ENVELOPE(-60.361,-60.361,-62.668,-62.668) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) The Antarctic Journal of Glaciology 65 252 689 699 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctic glaciology glacier flow ice temperature ice velocity subglacial processes 450 |
spellingShingle |
Antarctic glaciology glacier flow ice temperature ice velocity subglacial processes 450 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 |
topic_facet |
Antarctic glaciology glacier flow ice temperature ice velocity subglacial processes 450 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Sugiyama, Shin Navarro, Francisco J. Sawagaki, Takanobu Minowa, Masahiro Segawa, Takahiro Onuma, Yukihiko Otero, Jaime Vasilenko, Evgeny V. |
author_facet |
Sugiyama, Shin Navarro, Francisco J. Sawagaki, Takanobu Minowa, Masahiro Segawa, Takahiro Onuma, Yukihiko Otero, Jaime Vasilenko, Evgeny V. |
author_sort |
Sugiyama, Shin |
title |
Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula |
title_short |
Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula |
title_full |
Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula |
title_fullStr |
Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula |
title_full_unstemmed |
Subglacial water pressure and ice-speed variations at Johnsons Glacier, Livingston Island, Antarctic Peninsula |
title_sort |
subglacial water pressure and ice-speed variations at johnsons glacier, livingston island, antarctic peninsula |
publisher |
Cambridge University Press |
url |
http://hdl.handle.net/2115/75749 https://doi.org/10.1017/jog.2019.45 |
long_lat |
ENVELOPE(-60.350,-60.350,-62.665,-62.665) ENVELOPE(-60.361,-60.361,-62.668,-62.668) ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic Antarctic Peninsula Johnsons Johnsons Glacier Livingston Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Johnsons Johnsons Glacier Livingston Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Journal of Glaciology Livingston Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Journal of Glaciology Livingston Island |
op_relation |
http://hdl.handle.net/2115/75749 Journal of glaciology, 65(252): 689-699 http://dx.doi.org/10.1017/jog.2019.45 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2019.45 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
252 |
container_start_page |
689 |
op_container_end_page |
699 |
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1766255453961977856 |