The Dynamics of the Antarctic Circumpolar Current
The dynamics of the Antarctic Circumpolar Current (ACC) in a near-eddy-resolving model of the Southern Ocean (FRAM) are investigated. A streamwise coordinate system is used, rather than a more conventional approach of considering zonally averaged quantities. The motivation for this approach is the l...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:15864 2023-06-06T11:43:49+02:00 The Dynamics of the Antarctic Circumpolar Current Ivchenko, Vladimir O. Richards, Kelvin J. Stevens, David P. 1996-05 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/15864/ https://ueaeprints.uea.ac.uk/id/eprint/15864/1/DS_11.pdf https://doi.org/10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 en eng https://ueaeprints.uea.ac.uk/id/eprint/15864/1/DS_11.pdf Ivchenko, Vladimir O., Richards, Kelvin J. and Stevens, David P. (1996) The Dynamics of the Antarctic Circumpolar Current. Journal of Physical Oceanography, 26 (5). pp. 753-774. doi:10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 Article PeerReviewed 1996 ftuniveastangl https://doi.org/10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 2023-04-13T22:31:21Z The dynamics of the Antarctic Circumpolar Current (ACC) in a near-eddy-resolving model of the Southern Ocean (FRAM) are investigated. A streamwise coordinate system is used, rather than a more conventional approach of considering zonally averaged quantities. The motivation for this approach is the large deviation from a purely zonal flow made by the current. Comparisons are made with a zonal-mean analysis of the same model. It is found that the topographic form drag is the main sink of the momentum that is input by the wind. However, in contrast to a zonal-mean analysis other terms, namely, horizontal mixing, bottom friction, and advection of momentum, are no longer negligible. The total effect of transient eddies is to produce a drag on the mean flow, again in contrast to the zonally averaged case. The vertical penetration of stress is considered. A generalized formula is derived for the interfacial form stress averaged along a convoluted path and that includes nonquasigeostrophic effects. The interfacial form stress is found to be related not only to the local wind stress but also to changes in stratification and the Coriolis parameter along the path of integration. The vertical gradient of the extra terms is found to be proportional to the quasimeridional velocity averaged along an isopycnic surface. Using the model data, the nonquasigeostrophic effects are found to be important, particularly toward the northern flank of the ACC. Relating the vertical shear of the flow to the interfacial form stress, it is shown that the vertical structure of the flow is set by a combination of the wind stress and the meridional overturning. There is, therefore, an intimate linking of the wind and thermohaline-driven circulations. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of East Anglia: UEA Digital Repository Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
The dynamics of the Antarctic Circumpolar Current (ACC) in a near-eddy-resolving model of the Southern Ocean (FRAM) are investigated. A streamwise coordinate system is used, rather than a more conventional approach of considering zonally averaged quantities. The motivation for this approach is the large deviation from a purely zonal flow made by the current. Comparisons are made with a zonal-mean analysis of the same model. It is found that the topographic form drag is the main sink of the momentum that is input by the wind. However, in contrast to a zonal-mean analysis other terms, namely, horizontal mixing, bottom friction, and advection of momentum, are no longer negligible. The total effect of transient eddies is to produce a drag on the mean flow, again in contrast to the zonally averaged case. The vertical penetration of stress is considered. A generalized formula is derived for the interfacial form stress averaged along a convoluted path and that includes nonquasigeostrophic effects. The interfacial form stress is found to be related not only to the local wind stress but also to changes in stratification and the Coriolis parameter along the path of integration. The vertical gradient of the extra terms is found to be proportional to the quasimeridional velocity averaged along an isopycnic surface. Using the model data, the nonquasigeostrophic effects are found to be important, particularly toward the northern flank of the ACC. Relating the vertical shear of the flow to the interfacial form stress, it is shown that the vertical structure of the flow is set by a combination of the wind stress and the meridional overturning. There is, therefore, an intimate linking of the wind and thermohaline-driven circulations. |
format |
Article in Journal/Newspaper |
author |
Ivchenko, Vladimir O. Richards, Kelvin J. Stevens, David P. |
spellingShingle |
Ivchenko, Vladimir O. Richards, Kelvin J. Stevens, David P. The Dynamics of the Antarctic Circumpolar Current |
author_facet |
Ivchenko, Vladimir O. Richards, Kelvin J. Stevens, David P. |
author_sort |
Ivchenko, Vladimir O. |
title |
The Dynamics of the Antarctic Circumpolar Current |
title_short |
The Dynamics of the Antarctic Circumpolar Current |
title_full |
The Dynamics of the Antarctic Circumpolar Current |
title_fullStr |
The Dynamics of the Antarctic Circumpolar Current |
title_full_unstemmed |
The Dynamics of the Antarctic Circumpolar Current |
title_sort |
dynamics of the antarctic circumpolar current |
publishDate |
1996 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/15864/ https://ueaeprints.uea.ac.uk/id/eprint/15864/1/DS_11.pdf https://doi.org/10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/15864/1/DS_11.pdf Ivchenko, Vladimir O., Richards, Kelvin J. and Stevens, David P. (1996) The Dynamics of the Antarctic Circumpolar Current. Journal of Physical Oceanography, 26 (5). pp. 753-774. doi:10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0485(1996)026<0753:TDOTAC>2.0.CO;2 |
_version_ |
1767958160417488896 |