Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves.
Melting of West Antarctic ice shelves is enhanced by Circumpolar Deep Water (CDW) intruding onto the Amundsen and Bellingshausen Seas (ABS) continental shelves. Despite existing studies of cross-shelf and on-shelf CDW transports, CDW pathways onto the ABS originating from further offshore have never...
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ftcdlib:oai:escholarship.org/ark:/13030/qt9481m4wh 2023-05-15T14:04:04+02:00 Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. Nakayama, Yoshihiro Menemenlis, Dimitris Zhang, Hong Schodlok, Michael Rignot, Eric 3403 2018-08-24 application/pdf https://escholarship.org/uc/item/9481m4wh unknown eScholarship, University of California qt9481m4wh https://escholarship.org/uc/item/9481m4wh public Nature communications, vol 9, iss 1 article 2018 ftcdlib 2021-05-30T17:54:06Z Melting of West Antarctic ice shelves is enhanced by Circumpolar Deep Water (CDW) intruding onto the Amundsen and Bellingshausen Seas (ABS) continental shelves. Despite existing studies of cross-shelf and on-shelf CDW transports, CDW pathways onto the ABS originating from further offshore have never been investigated. Here, we investigate CDW pathways onto the ABS using a regional ocean model. Simulated CDW tracers from a zonal section across 67°S (S04P) circulate along the Antarctic Circumpolar Current (ACC) and Ross Gyre (RG) and travel into ABS continental shelf after 3-5 years, but source locations are shifted westward by ~900 km along S04P in 2001-2006 compared to 2009-2014. We find that simulated on- and off-shelf CDW is ~0.1-0.2 °C warmer in the 2009-2014 case than in the 2001-2006 case together with changes in simulated ocean circulation. These differences are primarily caused by lateral, rather than surface, boundary conditions, implying that large-scale atmospheric and ocean circulations are able to control CDW pathways and thus off- and on-shelf CDW properties. Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Ice Shelves University of California: eScholarship Antarctic Bellingshausen Sea The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
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ftcdlib |
language |
unknown |
description |
Melting of West Antarctic ice shelves is enhanced by Circumpolar Deep Water (CDW) intruding onto the Amundsen and Bellingshausen Seas (ABS) continental shelves. Despite existing studies of cross-shelf and on-shelf CDW transports, CDW pathways onto the ABS originating from further offshore have never been investigated. Here, we investigate CDW pathways onto the ABS using a regional ocean model. Simulated CDW tracers from a zonal section across 67°S (S04P) circulate along the Antarctic Circumpolar Current (ACC) and Ross Gyre (RG) and travel into ABS continental shelf after 3-5 years, but source locations are shifted westward by ~900 km along S04P in 2001-2006 compared to 2009-2014. We find that simulated on- and off-shelf CDW is ~0.1-0.2 °C warmer in the 2009-2014 case than in the 2001-2006 case together with changes in simulated ocean circulation. These differences are primarily caused by lateral, rather than surface, boundary conditions, implying that large-scale atmospheric and ocean circulations are able to control CDW pathways and thus off- and on-shelf CDW properties. |
format |
Article in Journal/Newspaper |
author |
Nakayama, Yoshihiro Menemenlis, Dimitris Zhang, Hong Schodlok, Michael Rignot, Eric |
spellingShingle |
Nakayama, Yoshihiro Menemenlis, Dimitris Zhang, Hong Schodlok, Michael Rignot, Eric Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
author_facet |
Nakayama, Yoshihiro Menemenlis, Dimitris Zhang, Hong Schodlok, Michael Rignot, Eric |
author_sort |
Nakayama, Yoshihiro |
title |
Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
title_short |
Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
title_full |
Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
title_fullStr |
Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
title_full_unstemmed |
Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves. |
title_sort |
origin of circumpolar deep water intruding onto the amundsen and bellingshausen sea continental shelves. |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/9481m4wh |
op_coverage |
3403 |
geographic |
Antarctic Bellingshausen Sea The Antarctic |
geographic_facet |
Antarctic Bellingshausen Sea The Antarctic |
genre |
Antarc* Antarctic Bellingshausen Sea Ice Shelves |
genre_facet |
Antarc* Antarctic Bellingshausen Sea Ice Shelves |
op_source |
Nature communications, vol 9, iss 1 |
op_relation |
qt9481m4wh https://escholarship.org/uc/item/9481m4wh |
op_rights |
public |
_version_ |
1766275039019139072 |