Active water exchange and life near the grounding line of an Antarctic outlet glacier
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 circ...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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Online Access: | http://hdl.handle.net/2115/57003 https://doi.org/10.1016/j.epsl.2014.05.001 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/57003 2023-05-15T13:40:56+02:00 Active water exchange and life near the grounding line of an Antarctic outlet glacier Sugiyama, Shin Sawagaki, Takanobu Fukuda, Takehiro Aoki, Shigeru http://hdl.handle.net/2115/57003 https://doi.org/10.1016/j.epsl.2014.05.001 eng eng Elsevier http://hdl.handle.net/2115/57003 Earth and Planetary Science Letters, 399: 52-60 http://dx.doi.org/10.1016/j.epsl.2014.05.001 http://creativecommons.org/licenses/by-nc-nd/3.0/ CC-BY-NC-ND Antarctica grounding line basal melting hot water drilling outlet glacier ice-ocean interaction 450 article fthokunivhus https://doi.org/10.1016/j.epsl.2014.05.001 2022-11-18T01:03:16Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic The Antarctic East Antarctica Langhovde ENVELOPE(39.733,39.733,-69.217,-69.217) Langhovde Glacier ENVELOPE(39.783,39.783,-69.200,-69.200) Earth and Planetary Science Letters 399 52 60 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctica grounding line basal melting hot water drilling outlet glacier ice-ocean interaction 450 |
spellingShingle |
Antarctica grounding line basal melting hot water drilling outlet glacier ice-ocean interaction 450 Sugiyama, Shin Sawagaki, Takanobu Fukuda, Takehiro Aoki, Shigeru Active water exchange and life near the grounding line of an Antarctic outlet glacier |
topic_facet |
Antarctica grounding line basal melting hot water drilling outlet glacier ice-ocean interaction 450 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Sugiyama, Shin Sawagaki, Takanobu Fukuda, Takehiro Aoki, Shigeru |
author_facet |
Sugiyama, Shin Sawagaki, Takanobu Fukuda, Takehiro Aoki, Shigeru |
author_sort |
Sugiyama, Shin |
title |
Active water exchange and life near the grounding line of an Antarctic outlet glacier |
title_short |
Active water exchange and life near the grounding line of an Antarctic outlet glacier |
title_full |
Active water exchange and life near the grounding line of an Antarctic outlet glacier |
title_fullStr |
Active water exchange and life near the grounding line of an Antarctic outlet glacier |
title_full_unstemmed |
Active water exchange and life near the grounding line of an Antarctic outlet glacier |
title_sort |
active water exchange and life near the grounding line of an antarctic outlet glacier |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/57003 https://doi.org/10.1016/j.epsl.2014.05.001 |
long_lat |
ENVELOPE(39.733,39.733,-69.217,-69.217) ENVELOPE(39.783,39.783,-69.200,-69.200) |
geographic |
Antarctic The Antarctic East Antarctica Langhovde Langhovde Glacier |
geographic_facet |
Antarctic The Antarctic East Antarctica Langhovde Langhovde Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf |
op_relation |
http://hdl.handle.net/2115/57003 Earth and Planetary Science Letters, 399: 52-60 http://dx.doi.org/10.1016/j.epsl.2014.05.001 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.epsl.2014.05.001 |
container_title |
Earth and Planetary Science Letters |
container_volume |
399 |
container_start_page |
52 |
op_container_end_page |
60 |
_version_ |
1766143457329414144 |