Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica
Basal melting of Antarctic ice shelves accounts for more than half of the mass loss from the Antarctic ice sheet. Many studies have focused on active basal melting at ice shelves in the Amundsen–Bellingshausen seas and the Totten ice shelf, East Antarctica. In these regions, the intrusion of Circump...
Published in: | The Cryosphere |
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00056161 2023-05-15T13:37:34+02:00 Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica Kusahara, Kazuya Hirano, Daisuke Fujii, Masakazu Fraser, Alexander D. Tamura, Takeshi 2021-04 electronic https://doi.org/10.5194/tc-15-1697-2021 https://noa.gwlb.de/receive/cop_mods_00056161 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055812/tc-15-1697-2021.pdf https://tc.copernicus.org/articles/15/1697/2021/tc-15-1697-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1697-2021 https://noa.gwlb.de/receive/cop_mods_00056161 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055812/tc-15-1697-2021.pdf https://tc.copernicus.org/articles/15/1697/2021/tc-15-1697-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-1697-2021 2022-02-08T22:34:11Z Basal melting of Antarctic ice shelves accounts for more than half of the mass loss from the Antarctic ice sheet. Many studies have focused on active basal melting at ice shelves in the Amundsen–Bellingshausen seas and the Totten ice shelf, East Antarctica. In these regions, the intrusion of Circumpolar Deep Water (CDW) onto the continental shelf is a key component for the localized intensive basal melting. Both regions have a common oceanographic feature: southward deflection of the Antarctic Circumpolar Current brings CDW toward the continental shelves. The physical setting of the Shirase Glacier tongue (SGT) in Lützow-Holm Bay corresponds to a similar configuration on the southeastern side of the Weddell Gyre in the Atlantic sector. Here, we conduct a 2–3 km resolution simulation of an ocean–sea ice–ice shelf model using a recently compiled bottom-topography dataset in the bay. The model can reproduce the observed CDW intrusion along the deep trough. The modeled SGT basal melting reaches a peak in summer and a minimum in autumn and winter, consistent with the wind-driven seasonality of the CDW thickness in the bay. The model results suggest the existence of an eastward-flowing undercurrent on the upper continental slope in summer, and the undercurrent contributes to the seasonal-to-interannual variability in the warm water intrusion into the bay. Furthermore, numerical experiments with and without fast-ice cover in the bay demonstrate that fast ice plays a role as an effective thermal insulator and reduces local sea ice formation, resulting in much warmer water intrusion into the SGT cavity. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice Shirase Glacier The Cryosphere Totten Ice Shelf Niedersächsisches Online-Archiv NOA Antarctic East Antarctica Lützow-Holm Bay ENVELOPE(38.000,38.000,-69.500,-69.500) Shirase Glacier ENVELOPE(39.000,39.000,-70.333,-70.333) The Antarctic Weddell The Cryosphere 15 4 1697 1717 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kusahara, Kazuya Hirano, Daisuke Fujii, Masakazu Fraser, Alexander D. Tamura, Takeshi Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Basal melting of Antarctic ice shelves accounts for more than half of the mass loss from the Antarctic ice sheet. Many studies have focused on active basal melting at ice shelves in the Amundsen–Bellingshausen seas and the Totten ice shelf, East Antarctica. In these regions, the intrusion of Circumpolar Deep Water (CDW) onto the continental shelf is a key component for the localized intensive basal melting. Both regions have a common oceanographic feature: southward deflection of the Antarctic Circumpolar Current brings CDW toward the continental shelves. The physical setting of the Shirase Glacier tongue (SGT) in Lützow-Holm Bay corresponds to a similar configuration on the southeastern side of the Weddell Gyre in the Atlantic sector. Here, we conduct a 2–3 km resolution simulation of an ocean–sea ice–ice shelf model using a recently compiled bottom-topography dataset in the bay. The model can reproduce the observed CDW intrusion along the deep trough. The modeled SGT basal melting reaches a peak in summer and a minimum in autumn and winter, consistent with the wind-driven seasonality of the CDW thickness in the bay. The model results suggest the existence of an eastward-flowing undercurrent on the upper continental slope in summer, and the undercurrent contributes to the seasonal-to-interannual variability in the warm water intrusion into the bay. Furthermore, numerical experiments with and without fast-ice cover in the bay demonstrate that fast ice plays a role as an effective thermal insulator and reduces local sea ice formation, resulting in much warmer water intrusion into the SGT cavity. |
format |
Article in Journal/Newspaper |
author |
Kusahara, Kazuya Hirano, Daisuke Fujii, Masakazu Fraser, Alexander D. Tamura, Takeshi |
author_facet |
Kusahara, Kazuya Hirano, Daisuke Fujii, Masakazu Fraser, Alexander D. Tamura, Takeshi |
author_sort |
Kusahara, Kazuya |
title |
Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
title_short |
Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
title_full |
Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
title_fullStr |
Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
title_full_unstemmed |
Modeling intensive ocean–cryosphere interactions in Lützow-Holm Bay, East Antarctica |
title_sort |
modeling intensive ocean–cryosphere interactions in lützow-holm bay, east antarctica |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-1697-2021 https://noa.gwlb.de/receive/cop_mods_00056161 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055812/tc-15-1697-2021.pdf https://tc.copernicus.org/articles/15/1697/2021/tc-15-1697-2021.pdf |
long_lat |
ENVELOPE(38.000,38.000,-69.500,-69.500) ENVELOPE(39.000,39.000,-70.333,-70.333) |
geographic |
Antarctic East Antarctica Lützow-Holm Bay Shirase Glacier The Antarctic Weddell |
geographic_facet |
Antarctic East Antarctica Lützow-Holm Bay Shirase Glacier The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice Shirase Glacier The Cryosphere Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice Shirase Glacier The Cryosphere Totten Ice Shelf |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1697-2021 https://noa.gwlb.de/receive/cop_mods_00056161 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055812/tc-15-1697-2021.pdf https://tc.copernicus.org/articles/15/1697/2021/tc-15-1697-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-15-1697-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1697 |
op_container_end_page |
1717 |
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1766094105099632640 |