Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica
Ice shelves in the Amundsen Sea are thinning rapidly as ocean currents bring warm water into the cavities beneath the floating ice. Although the reported melt rates for the Getz Ice Shelf are comparatively low for the region, its size makes it one of the largest freshwater sources around Antarctica,...
Published in: | Ocean Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/os-18-1339-2022 https://doaj.org/article/64413c1f6eab49d5adc7fc5b18d52d11 |
id |
ftdoajarticles:oai:doaj.org/article:64413c1f6eab49d5adc7fc5b18d52d11 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:64413c1f6eab49d5adc7fc5b18d52d11 2023-05-15T13:23:43+02:00 Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica V. Dundas E. Darelius K. Daae N. Steiger Y. Nakayama T.-W. Kim 2022-09-01T00:00:00Z https://doi.org/10.5194/os-18-1339-2022 https://doaj.org/article/64413c1f6eab49d5adc7fc5b18d52d11 EN eng Copernicus Publications https://os.copernicus.org/articles/18/1339/2022/os-18-1339-2022.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-18-1339-2022 1812-0784 1812-0792 https://doaj.org/article/64413c1f6eab49d5adc7fc5b18d52d11 Ocean Science, Vol 18, Pp 1339-1359 (2022) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.5194/os-18-1339-2022 2022-12-30T20:37:53Z Ice shelves in the Amundsen Sea are thinning rapidly as ocean currents bring warm water into the cavities beneath the floating ice. Although the reported melt rates for the Getz Ice Shelf are comparatively low for the region, its size makes it one of the largest freshwater sources around Antarctica, with potential consequences for, bottom water formation downstream, for example. Here, we use a 2-year-long novel mooring record (2016–2018) and 16-year-long regional model simulations to describe, for the first time, the hydrography and circulation in the vicinity of the ice front between Siple and Carney Island. We find that, throughout the mooring record, temperatures in the trough remain below 0.15 ∘ C, more than 1 ∘ C lower than in the neighboring Siple and Dotson Trough, and we observe a mean current (0.03 m s −1 ) directed toward the ice shelf front. The variability in the heat transport toward the ice shelf appears to be governed by nonlocal ocean surface stress over the Amundsen Sea Polynya region, and northward to the continental shelf break, where strengthened westward ocean surface stress leads to increased southward flow at the mooring site. The model simulations suggest that the heat content in the trough during the observed period was lower than normal, possibly owing to anomalously low summertime sea ice concentration and weak winds. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Carney Island Getz Ice Shelf Ice Shelf Ice Shelves Sea ice Directory of Open Access Journals: DOAJ Articles Amundsen Sea Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Getz Ice Shelf ENVELOPE(-126.500,-126.500,-74.250,-74.250) Carney Island ENVELOPE(-121.000,-121.000,-73.933,-73.933) Ocean Science 18 5 1339 1359 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 V. Dundas E. Darelius K. Daae N. Steiger Y. Nakayama T.-W. Kim Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
Ice shelves in the Amundsen Sea are thinning rapidly as ocean currents bring warm water into the cavities beneath the floating ice. Although the reported melt rates for the Getz Ice Shelf are comparatively low for the region, its size makes it one of the largest freshwater sources around Antarctica, with potential consequences for, bottom water formation downstream, for example. Here, we use a 2-year-long novel mooring record (2016–2018) and 16-year-long regional model simulations to describe, for the first time, the hydrography and circulation in the vicinity of the ice front between Siple and Carney Island. We find that, throughout the mooring record, temperatures in the trough remain below 0.15 ∘ C, more than 1 ∘ C lower than in the neighboring Siple and Dotson Trough, and we observe a mean current (0.03 m s −1 ) directed toward the ice shelf front. The variability in the heat transport toward the ice shelf appears to be governed by nonlocal ocean surface stress over the Amundsen Sea Polynya region, and northward to the continental shelf break, where strengthened westward ocean surface stress leads to increased southward flow at the mooring site. The model simulations suggest that the heat content in the trough during the observed period was lower than normal, possibly owing to anomalously low summertime sea ice concentration and weak winds. |
format |
Article in Journal/Newspaper |
author |
V. Dundas E. Darelius K. Daae N. Steiger Y. Nakayama T.-W. Kim |
author_facet |
V. Dundas E. Darelius K. Daae N. Steiger Y. Nakayama T.-W. Kim |
author_sort |
V. Dundas |
title |
Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
title_short |
Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
title_full |
Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
title_fullStr |
Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
title_full_unstemmed |
Hydrography, circulation, and response to atmospheric forcing in the vicinity of the central Getz Ice Shelf, Amundsen Sea, Antarctica |
title_sort |
hydrography, circulation, and response to atmospheric forcing in the vicinity of the central getz ice shelf, amundsen sea, antarctica |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/os-18-1339-2022 https://doaj.org/article/64413c1f6eab49d5adc7fc5b18d52d11 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(-126.500,-126.500,-74.250,-74.250) ENVELOPE(-121.000,-121.000,-73.933,-73.933) |
geographic |
Amundsen Sea Siple Getz Getz Ice Shelf Carney Island |
geographic_facet |
Amundsen Sea Siple Getz Getz Ice Shelf Carney Island |
genre |
Amundsen Sea Antarc* Antarctica Carney Island Getz Ice Shelf Ice Shelf Ice Shelves Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctica Carney Island Getz Ice Shelf Ice Shelf Ice Shelves Sea ice |
op_source |
Ocean Science, Vol 18, Pp 1339-1359 (2022) |
op_relation |
https://os.copernicus.org/articles/18/1339/2022/os-18-1339-2022.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-18-1339-2022 1812-0784 1812-0792 https://doaj.org/article/64413c1f6eab49d5adc7fc5b18d52d11 |
op_doi |
https://doi.org/10.5194/os-18-1339-2022 |
container_title |
Ocean Science |
container_volume |
18 |
container_issue |
5 |
container_start_page |
1339 |
op_container_end_page |
1359 |
_version_ |
1766374420950024192 |