Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica
The Totten Ice Shelf (TIS) and Moscow University Ice Shelf (MUIS), along the Sabrina Coast of Wilkes Land, are the floating seaward terminuses of the second-largest freshwater reservoir in the East Antarctic Ice Sheet. Being a marine ice sheet, it is vulnerable to the surrounding ocean conditions. R...
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2024
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ftdoajarticles:oai:doaj.org/article:0c447d8049df4dff94e53bd779763645 2024-02-04T09:56:00+01:00 Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica K. Kusahara D. Hirano M. Fujii A. D. Fraser T. Tamura K. Mizobata G. D. Williams S. Aoki 2024-01-01T00:00:00Z https://doi.org/10.5194/tc-18-43-2024 https://doaj.org/article/0c447d8049df4dff94e53bd779763645 EN eng Copernicus Publications https://tc.copernicus.org/articles/18/43/2024/tc-18-43-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-43-2024 1994-0416 1994-0424 https://doaj.org/article/0c447d8049df4dff94e53bd779763645 The Cryosphere, Vol 18, Pp 43-73 (2024) Environmental sciences GE1-350 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.5194/tc-18-43-2024 2024-01-07T01:42:13Z The Totten Ice Shelf (TIS) and Moscow University Ice Shelf (MUIS), along the Sabrina Coast of Wilkes Land, are the floating seaward terminuses of the second-largest freshwater reservoir in the East Antarctic Ice Sheet. Being a marine ice sheet, it is vulnerable to the surrounding ocean conditions. Recent comprehensive oceanographic observations, including bathymetric measurements off the Sabrina Coast, have shed light on the widespread intrusion of warm modified Circumpolar Deep Water (mCDW) onto the continental shelf and the intense ice–ocean interaction beneath the TIS. However, the spatiotemporal coverage of the observation is very limited. Here, we use an ocean–sea ice–ice shelf model with updated bathymetry to better understand the regional ocean circulations and ocean–cryosphere interactions. The model successfully captured the widespread intrusions of mCDW, local sea ice production and the ocean heat and volume transports into the TIS cavity, facilitating an examination of the overturning ocean circulation within the ice shelf cavities and the resultant basal melting. We found notable differences in the temporal variability in ice shelf basal melting across the two adjacent ice shelves of the TIS and the western part of the MUIS. Ocean heat transport by mCDW controls the low-frequency interannual-to-decadal variability in ice–ocean interactions, but the sea ice production in the Dalton Polynya strongly modifies the signals, explaining the regional difference between the two ice shelves. The formation of a summertime eastward-flowing undercurrent beneath the westward-flowing Antarctic Slope Current is found to play an important role in the seasonal delivery of ocean heat to the continental shelf. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Moscow University Ice Shelf Sea ice The Cryosphere Totten Ice Shelf Wilkes Land Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctic Ice Sheet East Antarctica Moscow University Ice Shelf ENVELOPE(121.000,121.000,-67.000,-67.000) Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) The Cryosphere 18 1 43 73 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 K. Kusahara D. Hirano M. Fujii A. D. Fraser T. Tamura K. Mizobata G. D. Williams S. Aoki Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The Totten Ice Shelf (TIS) and Moscow University Ice Shelf (MUIS), along the Sabrina Coast of Wilkes Land, are the floating seaward terminuses of the second-largest freshwater reservoir in the East Antarctic Ice Sheet. Being a marine ice sheet, it is vulnerable to the surrounding ocean conditions. Recent comprehensive oceanographic observations, including bathymetric measurements off the Sabrina Coast, have shed light on the widespread intrusion of warm modified Circumpolar Deep Water (mCDW) onto the continental shelf and the intense ice–ocean interaction beneath the TIS. However, the spatiotemporal coverage of the observation is very limited. Here, we use an ocean–sea ice–ice shelf model with updated bathymetry to better understand the regional ocean circulations and ocean–cryosphere interactions. The model successfully captured the widespread intrusions of mCDW, local sea ice production and the ocean heat and volume transports into the TIS cavity, facilitating an examination of the overturning ocean circulation within the ice shelf cavities and the resultant basal melting. We found notable differences in the temporal variability in ice shelf basal melting across the two adjacent ice shelves of the TIS and the western part of the MUIS. Ocean heat transport by mCDW controls the low-frequency interannual-to-decadal variability in ice–ocean interactions, but the sea ice production in the Dalton Polynya strongly modifies the signals, explaining the regional difference between the two ice shelves. The formation of a summertime eastward-flowing undercurrent beneath the westward-flowing Antarctic Slope Current is found to play an important role in the seasonal delivery of ocean heat to the continental shelf. |
format |
Article in Journal/Newspaper |
author |
K. Kusahara D. Hirano M. Fujii A. D. Fraser T. Tamura K. Mizobata G. D. Williams S. Aoki |
author_facet |
K. Kusahara D. Hirano M. Fujii A. D. Fraser T. Tamura K. Mizobata G. D. Williams S. Aoki |
author_sort |
K. Kusahara |
title |
Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
title_short |
Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
title_full |
Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
title_fullStr |
Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
title_full_unstemmed |
Modeling seasonal-to-decadal ocean–cryosphere interactions along the Sabrina Coast, East Antarctica |
title_sort |
modeling seasonal-to-decadal ocean–cryosphere interactions along the sabrina coast, east antarctica |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-43-2024 https://doaj.org/article/0c447d8049df4dff94e53bd779763645 |
long_lat |
ENVELOPE(121.000,121.000,-67.000,-67.000) ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Moscow University Ice Shelf Sabrina Coast Wilkes Land |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Moscow University Ice Shelf Sabrina Coast Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Moscow University Ice Shelf Sea ice The Cryosphere Totten Ice Shelf Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Moscow University Ice Shelf Sea ice The Cryosphere Totten Ice Shelf Wilkes Land |
op_source |
The Cryosphere, Vol 18, Pp 43-73 (2024) |
op_relation |
https://tc.copernicus.org/articles/18/43/2024/tc-18-43-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-43-2024 1994-0416 1994-0424 https://doaj.org/article/0c447d8049df4dff94e53bd779763645 |
op_doi |
https://doi.org/10.5194/tc-18-43-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
1 |
container_start_page |
43 |
op_container_end_page |
73 |
_version_ |
1789960303489843200 |