Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya
The formation of Antarctic Bottom Water-the cold, dense water that occupies the abyssal layer of the global ocean-is a key process in global ocean circulation. This water mass is formed as dense shelf water sinks to depth. Three regions around Antarctica where this process takes place have been prev...
Published in: | Nature Geoscience |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/fc620979-4bbc-4e77-8dd5-30f49ceec0fe 2024-09-15T17:46:55+00:00 Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya Ohshima, Kay I. Fukamachi, Yasushi Williams, Guy D. Nihashi, Sohey Roquet, Fabien Kitade, Yujiro Tamura, Takeshi Hirano, Daisuke Herraiz-Borreguero, Laura Field, Iain Hindell, Mark Aoki, Shigeru Wakatsuchi, Masaaki 2013-03 https://researchers.mq.edu.au/en/publications/fc620979-4bbc-4e77-8dd5-30f49ceec0fe https://doi.org/10.1038/ngeo1738 http://www.scopus.com/inward/record.url?scp=84874589811&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Ohshima , K I , Fukamachi , Y , Williams , G D , Nihashi , S , Roquet , F , Kitade , Y , Tamura , T , Hirano , D , Herraiz-Borreguero , L , Field , I , Hindell , M , Aoki , S & Wakatsuchi , M 2013 , ' Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya ' , Nature Geoscience , vol. 6 , no. 3 , pp. 235-240 . https://doi.org/10.1038/ngeo1738 article 2013 ftmacquarieunicr https://doi.org/10.1038/ngeo1738 2024-08-28T23:47:18Z The formation of Antarctic Bottom Water-the cold, dense water that occupies the abyssal layer of the global ocean-is a key process in global ocean circulation. This water mass is formed as dense shelf water sinks to depth. Three regions around Antarctica where this process takes place have been previously documented. The presence of another source has been identified in hydrographic and tracer data, although the site of formation is not well constrained. Here we document the formation of dense shelf water in the Cape Darnley polynya (65°-69°E) and its subsequent transformation into bottom water using data from moorings and instrumented elephant seals (Mirounga leonina). Unlike the previously identified sources of Antarctic Bottom Water, which require the presence of an ice shelf or a large storage volume, bottom water production at the Cape Darnley polynya is driven primarily by the flux of salt released by sea-ice formation. We estimate that about 0.3-0.7 × 10 6 m 3 s -1 of dense shelf water produced by the Cape Darnley polynya is transformed into Antarctic Bottom Water. The transformation of this water mass, which we term Cape Darnley Bottom Water, accounts for 6-13% of the circumpolar total. Article in Journal/Newspaper Antarc* Antarctic Antarctica Elephant Seals Ice Shelf Mirounga leonina Sea ice Macquarie University Research Portal Nature Geoscience 6 3 235 240 |
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Macquarie University Research Portal |
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ftmacquarieunicr |
language |
English |
description |
The formation of Antarctic Bottom Water-the cold, dense water that occupies the abyssal layer of the global ocean-is a key process in global ocean circulation. This water mass is formed as dense shelf water sinks to depth. Three regions around Antarctica where this process takes place have been previously documented. The presence of another source has been identified in hydrographic and tracer data, although the site of formation is not well constrained. Here we document the formation of dense shelf water in the Cape Darnley polynya (65°-69°E) and its subsequent transformation into bottom water using data from moorings and instrumented elephant seals (Mirounga leonina). Unlike the previously identified sources of Antarctic Bottom Water, which require the presence of an ice shelf or a large storage volume, bottom water production at the Cape Darnley polynya is driven primarily by the flux of salt released by sea-ice formation. We estimate that about 0.3-0.7 × 10 6 m 3 s -1 of dense shelf water produced by the Cape Darnley polynya is transformed into Antarctic Bottom Water. The transformation of this water mass, which we term Cape Darnley Bottom Water, accounts for 6-13% of the circumpolar total. |
format |
Article in Journal/Newspaper |
author |
Ohshima, Kay I. Fukamachi, Yasushi Williams, Guy D. Nihashi, Sohey Roquet, Fabien Kitade, Yujiro Tamura, Takeshi Hirano, Daisuke Herraiz-Borreguero, Laura Field, Iain Hindell, Mark Aoki, Shigeru Wakatsuchi, Masaaki |
spellingShingle |
Ohshima, Kay I. Fukamachi, Yasushi Williams, Guy D. Nihashi, Sohey Roquet, Fabien Kitade, Yujiro Tamura, Takeshi Hirano, Daisuke Herraiz-Borreguero, Laura Field, Iain Hindell, Mark Aoki, Shigeru Wakatsuchi, Masaaki Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
author_facet |
Ohshima, Kay I. Fukamachi, Yasushi Williams, Guy D. Nihashi, Sohey Roquet, Fabien Kitade, Yujiro Tamura, Takeshi Hirano, Daisuke Herraiz-Borreguero, Laura Field, Iain Hindell, Mark Aoki, Shigeru Wakatsuchi, Masaaki |
author_sort |
Ohshima, Kay I. |
title |
Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
title_short |
Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
title_full |
Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
title_fullStr |
Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
title_full_unstemmed |
Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya |
title_sort |
antarctic bottom water production by intense sea-ice formation in the cape darnley polynya |
publishDate |
2013 |
url |
https://researchers.mq.edu.au/en/publications/fc620979-4bbc-4e77-8dd5-30f49ceec0fe https://doi.org/10.1038/ngeo1738 http://www.scopus.com/inward/record.url?scp=84874589811&partnerID=8YFLogxK |
genre |
Antarc* Antarctic Antarctica Elephant Seals Ice Shelf Mirounga leonina Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Elephant Seals Ice Shelf Mirounga leonina Sea ice |
op_source |
Ohshima , K I , Fukamachi , Y , Williams , G D , Nihashi , S , Roquet , F , Kitade , Y , Tamura , T , Hirano , D , Herraiz-Borreguero , L , Field , I , Hindell , M , Aoki , S & Wakatsuchi , M 2013 , ' Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya ' , Nature Geoscience , vol. 6 , no. 3 , pp. 235-240 . https://doi.org/10.1038/ngeo1738 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1038/ngeo1738 |
container_title |
Nature Geoscience |
container_volume |
6 |
container_issue |
3 |
container_start_page |
235 |
op_container_end_page |
240 |
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1810495348033978368 |