Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica
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...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/82802 2023-05-15T13:51:33+02:00 Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica Minowa, Masahiro Sugiyama, Shin Ito, Masato Yamane, Shiori Aoki, Shigeru http://hdl.handle.net/2115/82802 https://doi.org/10.1038/s41467-021-23534-w eng eng Nature Portfolio http://hdl.handle.net/2115/82802 Nature communications, 12(1): 4209 http://dx.doi.org/10.1038/s41467-021-23534-w 450 article fthokunivhus https://doi.org/10.1038/s41467-021-23534-w 2022-11-18T01:06:41Z 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 similar to 3-km-long ice shelf of Langhovde Glacier in East Antarctica. The measurements were performed in 302-12m-thick ocean cavity beneath 234-412m-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 degrees C, leading to a mean basal melt rate estimate of 1.42ma(-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. Basal melting of ice shelves is the principal driver of recent ice mass loss in Antarctica. The study reports comprehensive structures of temperature, salinity and current under an ice shelf in East Antarctica obtained by borehole measurements. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic East Antarctica Langhovde ENVELOPE(39.733,39.733,-69.217,-69.217) Langhovde Glacier ENVELOPE(39.783,39.783,-69.200,-69.200) Nature Communications 12 1 |
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Open Polar |
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Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
450 |
spellingShingle |
450 Minowa, Masahiro Sugiyama, Shin Ito, Masato Yamane, Shiori Aoki, Shigeru Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
topic_facet |
450 |
description |
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 similar to 3-km-long ice shelf of Langhovde Glacier in East Antarctica. The measurements were performed in 302-12m-thick ocean cavity beneath 234-412m-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 degrees C, leading to a mean basal melt rate estimate of 1.42ma(-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. Basal melting of ice shelves is the principal driver of recent ice mass loss in Antarctica. The study reports comprehensive structures of temperature, salinity and current under an ice shelf in East Antarctica obtained by borehole measurements. |
format |
Article in Journal/Newspaper |
author |
Minowa, Masahiro Sugiyama, Shin Ito, Masato Yamane, Shiori Aoki, Shigeru |
author_facet |
Minowa, Masahiro Sugiyama, Shin Ito, Masato Yamane, Shiori Aoki, Shigeru |
author_sort |
Minowa, Masahiro |
title |
Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
title_short |
Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
title_full |
Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
title_fullStr |
Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
title_full_unstemmed |
Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
title_sort |
thermohaline structure and circulation beneath the langhovde glacier ice shelf in east antarctica |
publisher |
Nature Portfolio |
url |
http://hdl.handle.net/2115/82802 https://doi.org/10.1038/s41467-021-23534-w |
long_lat |
ENVELOPE(39.733,39.733,-69.217,-69.217) ENVELOPE(39.783,39.783,-69.200,-69.200) |
geographic |
Antarctic East Antarctica Langhovde Langhovde Glacier |
geographic_facet |
Antarctic East Antarctica Langhovde Langhovde Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves |
op_relation |
http://hdl.handle.net/2115/82802 Nature communications, 12(1): 4209 http://dx.doi.org/10.1038/s41467-021-23534-w |
op_doi |
https://doi.org/10.1038/s41467-021-23534-w |
container_title |
Nature Communications |
container_volume |
12 |
container_issue |
1 |
_version_ |
1766255460296425472 |