Does Topographic Form Stress Impede Prograde Ocean Currents?
Topographic form stress (TFS) plays a central role in constraining the transport of the Antarctic Circumpolar Current (ACC), and thus the rate of exchange between the major ocean basins. Topographic form stress generation in the ACC has been linked to the formation of standing Rossby waves, which oc...
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ftunivsthongkong:oai:repository.hkust.edu.hk:1783.1-112794 2023-05-15T13:46:12+02:00 Does Topographic Form Stress Impede Prograde Ocean Currents? Bai, Yue Wang, Yan Stewart, Andrew L. 2021 https://repository.hkust.edu.hk/ir/Record/1783.1-112794 https://doi.org/10.1175/JPO-D-20-0189.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0022-3670&rft.volume=v. 51&rft.issue=(8)&rft.date=2021&rft.spage=2617&rft.aulast=Bai&rft.aufirst=Yue&rft.atitle=Does+Topographic+Form+Stress+Impede+Prograde+Ocean+Currents%3F&rft.title=JOURNAL+OF+PHYSICAL+OCEANOGRAPHY http://www.scopus.com/record/display.url?eid=2-s2.0-85134324502&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000686012200013 https://repository.hkust.edu.hk/ir/bitstream/1783.1-112794/1/040483_1.pdf English eng https://repository.hkust.edu.hk/ir/Record/1783.1-112794 Journal of Physical Oceanography, v. 51, (8), August 2021, p. 2617-2638 0022-3670 1520-0485 https://doi.org/10.1175/JPO-D-20-0189.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0022-3670&rft.volume=v. 51&rft.issue=(8)&rft.date=2021&rft.spage=2617&rft.aulast=Bai&rft.aufirst=Yue&rft.atitle=Does+Topographic+Form+Stress+Impede+Prograde+Ocean+Currents%3F&rft.title=JOURNAL+OF+PHYSICAL+OCEANOGRAPHY http://www.scopus.com/record/display.url?eid=2-s2.0-85134324502&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000686012200013 https://repository.hkust.edu.hk/ir/bitstream/1783.1-112794/1/040483_1.pdf Ocean Southern Ocean Channel flows Forcing Momentum Ocean dynamics Article 2021 ftunivsthongkong https://doi.org/10.1175/JPO-D-20-0189.1 2022-09-09T00:09:15Z Topographic form stress (TFS) plays a central role in constraining the transport of the Antarctic Circumpolar Current (ACC), and thus the rate of exchange between the major ocean basins. Topographic form stress generation in the ACC has been linked to the formation of standing Rossby waves, which occur because the current is retrograde (opposing the direction of Rossby wave propagation). However, it is unclear whether TFS similarly retards current systems that are prograde (in the direction of Rossby wave propagation), which cannot arrest Rossby waves. An isopycnal model is used to investigate the momentum balance of wind-driven prograde and retrograde flows in a zonal channel, with bathymetry consisting of either a single ridge or a continental shelf and slope with a meridional excursion. Consistent with previous studies, retrograde flows are almost entirely impeded by TFS, except in the limit of flat bathymetry, whereas prograde flows are typically impeded by a combination of TFS and bottom friction. A barotropic theory for standing waves shows that bottom friction serves to shift the phase of the standing wave's pressure field from that of the bathymetry, which is necessary to produce TFS. The mechanism is the same in prograde and retrograde flows, but is most efficient when the mean flow arrests a Rossby wave with a wavelength comparable to that of the bathymetry. The asymmetry between prograde and retrograde momentum balances implies that prograde current systems may be more sensitive to changes in wind forcing, for example associated with climate shifts. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean The Hong Kong University of Science and Technology: HKUST Institutional Repository Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography |
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Open Polar |
collection |
The Hong Kong University of Science and Technology: HKUST Institutional Repository |
op_collection_id |
ftunivsthongkong |
language |
English |
topic |
Ocean Southern Ocean Channel flows Forcing Momentum Ocean dynamics |
spellingShingle |
Ocean Southern Ocean Channel flows Forcing Momentum Ocean dynamics Bai, Yue Wang, Yan Stewart, Andrew L. Does Topographic Form Stress Impede Prograde Ocean Currents? |
topic_facet |
Ocean Southern Ocean Channel flows Forcing Momentum Ocean dynamics |
description |
Topographic form stress (TFS) plays a central role in constraining the transport of the Antarctic Circumpolar Current (ACC), and thus the rate of exchange between the major ocean basins. Topographic form stress generation in the ACC has been linked to the formation of standing Rossby waves, which occur because the current is retrograde (opposing the direction of Rossby wave propagation). However, it is unclear whether TFS similarly retards current systems that are prograde (in the direction of Rossby wave propagation), which cannot arrest Rossby waves. An isopycnal model is used to investigate the momentum balance of wind-driven prograde and retrograde flows in a zonal channel, with bathymetry consisting of either a single ridge or a continental shelf and slope with a meridional excursion. Consistent with previous studies, retrograde flows are almost entirely impeded by TFS, except in the limit of flat bathymetry, whereas prograde flows are typically impeded by a combination of TFS and bottom friction. A barotropic theory for standing waves shows that bottom friction serves to shift the phase of the standing wave's pressure field from that of the bathymetry, which is necessary to produce TFS. The mechanism is the same in prograde and retrograde flows, but is most efficient when the mean flow arrests a Rossby wave with a wavelength comparable to that of the bathymetry. The asymmetry between prograde and retrograde momentum balances implies that prograde current systems may be more sensitive to changes in wind forcing, for example associated with climate shifts. |
format |
Article in Journal/Newspaper |
author |
Bai, Yue Wang, Yan Stewart, Andrew L. |
author_facet |
Bai, Yue Wang, Yan Stewart, Andrew L. |
author_sort |
Bai, Yue |
title |
Does Topographic Form Stress Impede Prograde Ocean Currents? |
title_short |
Does Topographic Form Stress Impede Prograde Ocean Currents? |
title_full |
Does Topographic Form Stress Impede Prograde Ocean Currents? |
title_fullStr |
Does Topographic Form Stress Impede Prograde Ocean Currents? |
title_full_unstemmed |
Does Topographic Form Stress Impede Prograde Ocean Currents? |
title_sort |
does topographic form stress impede prograde ocean currents? |
publishDate |
2021 |
url |
https://repository.hkust.edu.hk/ir/Record/1783.1-112794 https://doi.org/10.1175/JPO-D-20-0189.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0022-3670&rft.volume=v. 51&rft.issue=(8)&rft.date=2021&rft.spage=2617&rft.aulast=Bai&rft.aufirst=Yue&rft.atitle=Does+Topographic+Form+Stress+Impede+Prograde+Ocean+Currents%3F&rft.title=JOURNAL+OF+PHYSICAL+OCEANOGRAPHY http://www.scopus.com/record/display.url?eid=2-s2.0-85134324502&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000686012200013 https://repository.hkust.edu.hk/ir/bitstream/1783.1-112794/1/040483_1.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://repository.hkust.edu.hk/ir/Record/1783.1-112794 Journal of Physical Oceanography, v. 51, (8), August 2021, p. 2617-2638 0022-3670 1520-0485 https://doi.org/10.1175/JPO-D-20-0189.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0022-3670&rft.volume=v. 51&rft.issue=(8)&rft.date=2021&rft.spage=2617&rft.aulast=Bai&rft.aufirst=Yue&rft.atitle=Does+Topographic+Form+Stress+Impede+Prograde+Ocean+Currents%3F&rft.title=JOURNAL+OF+PHYSICAL+OCEANOGRAPHY http://www.scopus.com/record/display.url?eid=2-s2.0-85134324502&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000686012200013 https://repository.hkust.edu.hk/ir/bitstream/1783.1-112794/1/040483_1.pdf |
op_doi |
https://doi.org/10.1175/JPO-D-20-0189.1 |
container_title |
Journal of Physical Oceanography |
_version_ |
1766238381587562496 |