Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective
In the Southern Ocean the Antarctic Circumpolar Current is significantly steered by large topographic features, and subpolar gyres form in their lee. The geometry of topographic features in the Southern Ocean is highly variable, but the influence of this variation on the large-scale flow is poorly u...
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Language: | English |
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ftsouthampton:oai:eprints.soton.ac.uk:437917 2023-08-27T04:04:35+02:00 Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective Patmore, Ryan D. Holland, Paul R. Munday, David R. Naveira Garabato, Alberto C. Stevens, David P. Meredith, Michael P. 2019-12 text https://eprints.soton.ac.uk/437917/ https://eprints.soton.ac.uk/437917/1/10.1175untitled.pdf en English eng https://eprints.soton.ac.uk/437917/1/10.1175untitled.pdf Patmore, Ryan D., Holland, Paul R., Munday, David R., Naveira Garabato, Alberto C., Stevens, David P. and Meredith, Michael P. (2019) Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective. Journal of Physical Oceanography, 49 (12), 3221-3244. (doi:10.1175/JPO-D-19-0083.1 <http://dx.doi.org/10.1175/JPO-D-19-0083.1>). cc_by_4 Article PeerReviewed 2019 ftsouthampton https://doi.org/10.1175/JPO-D-19-0083.1 2023-08-03T22:24:24Z In the Southern Ocean the Antarctic Circumpolar Current is significantly steered by large topographic features, and subpolar gyres form in their lee. The geometry of topographic features in the Southern Ocean is highly variable, but the influence of this variation on the large-scale flow is poorly understood. Using idealized barotropic simulations of a zonal channel with a meridional ridge, it is found that the ridge geometry is important for determining the net zonal volume transport. A relationship is observed between ridge width and volume transport that is determined by the form stress generated by the ridge. Gyre formation is also highly reliant on the ridge geometry. A steep ridge allows gyres to form within regions of unblocked geostrophic (f/H) contours, with an increase in gyre strength as the ridge width is reduced. These relationships among ridge width, gyre strength, and net zonal volume transport emerge to simultaneously satisfy the conservation of momentum and vorticity. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Southampton: e-Prints Soton Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography 49 12 3221 3244 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
In the Southern Ocean the Antarctic Circumpolar Current is significantly steered by large topographic features, and subpolar gyres form in their lee. The geometry of topographic features in the Southern Ocean is highly variable, but the influence of this variation on the large-scale flow is poorly understood. Using idealized barotropic simulations of a zonal channel with a meridional ridge, it is found that the ridge geometry is important for determining the net zonal volume transport. A relationship is observed between ridge width and volume transport that is determined by the form stress generated by the ridge. Gyre formation is also highly reliant on the ridge geometry. A steep ridge allows gyres to form within regions of unblocked geostrophic (f/H) contours, with an increase in gyre strength as the ridge width is reduced. These relationships among ridge width, gyre strength, and net zonal volume transport emerge to simultaneously satisfy the conservation of momentum and vorticity. |
format |
Article in Journal/Newspaper |
author |
Patmore, Ryan D. Holland, Paul R. Munday, David R. Naveira Garabato, Alberto C. Stevens, David P. Meredith, Michael P. |
spellingShingle |
Patmore, Ryan D. Holland, Paul R. Munday, David R. Naveira Garabato, Alberto C. Stevens, David P. Meredith, Michael P. Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
author_facet |
Patmore, Ryan D. Holland, Paul R. Munday, David R. Naveira Garabato, Alberto C. Stevens, David P. Meredith, Michael P. |
author_sort |
Patmore, Ryan D. |
title |
Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
title_short |
Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
title_full |
Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
title_fullStr |
Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
title_full_unstemmed |
Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective |
title_sort |
topographic control of southern ocean gyres and the antarctic circumpolar current: a barotropic perspective |
publishDate |
2019 |
url |
https://eprints.soton.ac.uk/437917/ https://eprints.soton.ac.uk/437917/1/10.1175untitled.pdf |
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://eprints.soton.ac.uk/437917/1/10.1175untitled.pdf Patmore, Ryan D., Holland, Paul R., Munday, David R., Naveira Garabato, Alberto C., Stevens, David P. and Meredith, Michael P. (2019) Topographic control of Southern Ocean gyres and the Antarctic circumpolar current: A barotropic perspective. Journal of Physical Oceanography, 49 (12), 3221-3244. (doi:10.1175/JPO-D-19-0083.1 <http://dx.doi.org/10.1175/JPO-D-19-0083.1>). |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1175/JPO-D-19-0083.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
12 |
container_start_page |
3221 |
op_container_end_page |
3244 |
_version_ |
1775352262125682688 |