On the fast response of the Southern Ocean to changes in the zonal wind
International audience Model studies of the Southern Ocean, reported here, show that the Antarctic Circumpolar Current responds within two days to changes in the zonal wind stress at the latitudes of Drake Passage. Further investigation shows that the response is primarily barotropic and that, as on...
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ftinsu:oai:HAL:hal-00298343v1 2023-11-12T04:06:55+01:00 On the fast response of the Southern Ocean to changes in the zonal wind Webb, D. J. de Cuevas, B. A. National Oceanography Centre Southampton (NOC) University of Southampton 2007-09-24 https://hal.science/hal-00298343 https://hal.science/hal-00298343/document https://hal.science/hal-00298343/file/os-3-417-2007.pdf en eng HAL CCSD European Geosciences Union hal-00298343 https://hal.science/hal-00298343 https://hal.science/hal-00298343/document https://hal.science/hal-00298343/file/os-3-417-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00298343 Ocean Science, 2007, 3 (3), pp.417-427 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:28:06Z International audience Model studies of the Southern Ocean, reported here, show that the Antarctic Circumpolar Current responds within two days to changes in the zonal wind stress at the latitudes of Drake Passage. Further investigation shows that the response is primarily barotropic and that, as one might expect, it is controlled by topography. Analysis of the results show that the changes in the barotropic flow are sufficient to transfer the changed surface wind stress to the underlying topography and that during this initial phase baroclinic processes are not involved. The model results also show that the Deacon Cell responds to changes in the wind stress on the same rapid time scale. It is shown that the changes in the Deacon Cell can also be explained by the change in the barotropic velocity field, an increase in the zonal wind stress producing an increased northward flow in shallow regions and southward flow where the ocean is deep. This new explanation is unexpected as previously the Deacon Cell has been thought of as a baroclinic feature of the ocean. The results imply that where baroclinic processes do appear to be involved in either the zonal momentum balance of the Southern Ocean or the formation of the Deacon Cell, they are part of the long term baroclinic response of the ocean's density field to the changes in the barotropic flow. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean The Antarctic Drake Passage Deacon ENVELOPE(-59.987,-59.987,-73.248,-73.248) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Webb, D. J. de Cuevas, B. A. On the fast response of the Southern Ocean to changes in the zonal wind |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Model studies of the Southern Ocean, reported here, show that the Antarctic Circumpolar Current responds within two days to changes in the zonal wind stress at the latitudes of Drake Passage. Further investigation shows that the response is primarily barotropic and that, as one might expect, it is controlled by topography. Analysis of the results show that the changes in the barotropic flow are sufficient to transfer the changed surface wind stress to the underlying topography and that during this initial phase baroclinic processes are not involved. The model results also show that the Deacon Cell responds to changes in the wind stress on the same rapid time scale. It is shown that the changes in the Deacon Cell can also be explained by the change in the barotropic velocity field, an increase in the zonal wind stress producing an increased northward flow in shallow regions and southward flow where the ocean is deep. This new explanation is unexpected as previously the Deacon Cell has been thought of as a baroclinic feature of the ocean. The results imply that where baroclinic processes do appear to be involved in either the zonal momentum balance of the Southern Ocean or the formation of the Deacon Cell, they are part of the long term baroclinic response of the ocean's density field to the changes in the barotropic flow. |
author2 |
National Oceanography Centre Southampton (NOC) University of Southampton |
format |
Article in Journal/Newspaper |
author |
Webb, D. J. de Cuevas, B. A. |
author_facet |
Webb, D. J. de Cuevas, B. A. |
author_sort |
Webb, D. J. |
title |
On the fast response of the Southern Ocean to changes in the zonal wind |
title_short |
On the fast response of the Southern Ocean to changes in the zonal wind |
title_full |
On the fast response of the Southern Ocean to changes in the zonal wind |
title_fullStr |
On the fast response of the Southern Ocean to changes in the zonal wind |
title_full_unstemmed |
On the fast response of the Southern Ocean to changes in the zonal wind |
title_sort |
on the fast response of the southern ocean to changes in the zonal wind |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00298343 https://hal.science/hal-00298343/document https://hal.science/hal-00298343/file/os-3-417-2007.pdf |
long_lat |
ENVELOPE(-59.987,-59.987,-73.248,-73.248) |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage Deacon |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage Deacon |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00298343 Ocean Science, 2007, 3 (3), pp.417-427 |
op_relation |
hal-00298343 https://hal.science/hal-00298343 https://hal.science/hal-00298343/document https://hal.science/hal-00298343/file/os-3-417-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327831103012864 |