Physical model of bathymetric effects on the antarctic circumpolar current
Laboratory experiments were conducted to simulate some of the effects of the bathymetry of the southern ocean on the physical characteristics of the Antarctic Circumpolar Current (ACC). An idealized zonal wind stress, which varied inversely with the distance from the model Antarctic continent, was s...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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1993
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Online Access: | http://discovery.dundee.ac.uk/portal/en/research/physical-model-of-bathymetric-effects-on-the-antarctic-circumpolar-current(2eb9720d-1b36-4f14-95c5-b3d7d300a795).html https://doi.org/10.1029/92JC02254 http://hdl.handle.net/10588/2eb9720d-1b36-4f14-95c5-b3d7d300a795 |
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ftunivdundeepure:oai:discovery.dundee.ac.uk:publications/2eb9720d-1b36-4f14-95c5-b3d7d300a795 2023-05-15T13:59:42+02:00 Physical model of bathymetric effects on the antarctic circumpolar current Boyer, Don L. Chen, Rui-Rong Tao, Lijun Davies, Peter A. 1993 http://discovery.dundee.ac.uk/portal/en/research/physical-model-of-bathymetric-effects-on-the-antarctic-circumpolar-current(2eb9720d-1b36-4f14-95c5-b3d7d300a795).html https://doi.org/10.1029/92JC02254 http://hdl.handle.net/10588/2eb9720d-1b36-4f14-95c5-b3d7d300a795 eng eng info:eu-repo/semantics/restrictedAccess Boyer , D L , Chen , R-R , Tao , L & Davies , P A 1993 , ' Physical model of bathymetric effects on the antarctic circumpolar current ' Journal of Geophysical Research: Oceans , vol 98 , no. C2 , pp. 2587-2608 . DOI:10.1029/92JC02254 TOPOGRAPHY STRATIFIED OCEAN LARGE-SCALE FLOW WIND-DRIVEN SPIN-UP SURFACE CIRCULATION SOUTHERN-OCEAN article 1993 ftunivdundeepure https://doi.org/10.1029/92JC02254 2017-09-28T19:35:11Z Laboratory experiments were conducted to simulate some of the effects of the bathymetry of the southern ocean on the physical characteristics of the Antarctic Circumpolar Current (ACC). An idealized zonal wind stress, which varied inversely with the distance from the model Antarctic continent, was simulated in the laboratory model by a radially inward sink-source flow in a thin layer along the surface of the circular test cell. The experiments demonstrated the feasibility of simulating the surface wind stress in physical models by source-sink forcing. The present model, however, has the limitation of not accounting for such factors as the longitudinal variations in the wind shear and the decrease in wind stress on approaching the Antarctic continent from the north. Planetary beta effects were neglected because the topographic beta term can be shown to dominate over large portions of the model area. The neglect of beta effects is also a limitation of the model. In spite of these limitations, however, the simulations of the physical model for both the homogeneous and linearly stratified cases were shown to be in good agreement with observations of the ACC. These include well-defined strong currents along the mid-ocean ridge; strong perturbations in the vicinity of the Macquarie Ridge, Campbell Plateau, and Kerguelen Gaussberg Plateau; strong meridional transport to the east of the Drake Passage; and anomalies to the south (wave troughs) and to the north (wave ridges) of the main circumpolar current over ocean basins and mountain ridges, respectively. It was shown that the Eltanin and Udintsev fracture zones in the vicinity of 135-degrees-W are important factors in directing the ACC eastward across the Southeast Pacific Basin to the Drake Passage. The model results suggest that these fracture zones can influence the nature of the flow in the western Atlantic because of their control of the flow through the Drake Passage. The estimated volume transports through the Drake Passage based on the model results are in fair agreement with oceanic observations. Estimates of the spin-up time of the system for homogeneous and stratified cases have been provided. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Discovery - University of Dundee Online Publications Antarctic Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) Drake Passage Gaussberg ENVELOPE(89.183,89.183,-66.800,-66.800) Kerguelen Pacific Southeast Pacific Basin ENVELOPE(-115.000,-115.000,-60.000,-60.000) Southern Ocean The Antarctic Journal of Geophysical Research: Oceans 98 C2 2587 2608 |
institution |
Open Polar |
collection |
Discovery - University of Dundee Online Publications |
op_collection_id |
ftunivdundeepure |
language |
English |
topic |
TOPOGRAPHY STRATIFIED OCEAN LARGE-SCALE FLOW WIND-DRIVEN SPIN-UP SURFACE CIRCULATION SOUTHERN-OCEAN |
spellingShingle |
TOPOGRAPHY STRATIFIED OCEAN LARGE-SCALE FLOW WIND-DRIVEN SPIN-UP SURFACE CIRCULATION SOUTHERN-OCEAN Boyer, Don L. Chen, Rui-Rong Tao, Lijun Davies, Peter A. Physical model of bathymetric effects on the antarctic circumpolar current |
topic_facet |
TOPOGRAPHY STRATIFIED OCEAN LARGE-SCALE FLOW WIND-DRIVEN SPIN-UP SURFACE CIRCULATION SOUTHERN-OCEAN |
description |
Laboratory experiments were conducted to simulate some of the effects of the bathymetry of the southern ocean on the physical characteristics of the Antarctic Circumpolar Current (ACC). An idealized zonal wind stress, which varied inversely with the distance from the model Antarctic continent, was simulated in the laboratory model by a radially inward sink-source flow in a thin layer along the surface of the circular test cell. The experiments demonstrated the feasibility of simulating the surface wind stress in physical models by source-sink forcing. The present model, however, has the limitation of not accounting for such factors as the longitudinal variations in the wind shear and the decrease in wind stress on approaching the Antarctic continent from the north. Planetary beta effects were neglected because the topographic beta term can be shown to dominate over large portions of the model area. The neglect of beta effects is also a limitation of the model. In spite of these limitations, however, the simulations of the physical model for both the homogeneous and linearly stratified cases were shown to be in good agreement with observations of the ACC. These include well-defined strong currents along the mid-ocean ridge; strong perturbations in the vicinity of the Macquarie Ridge, Campbell Plateau, and Kerguelen Gaussberg Plateau; strong meridional transport to the east of the Drake Passage; and anomalies to the south (wave troughs) and to the north (wave ridges) of the main circumpolar current over ocean basins and mountain ridges, respectively. It was shown that the Eltanin and Udintsev fracture zones in the vicinity of 135-degrees-W are important factors in directing the ACC eastward across the Southeast Pacific Basin to the Drake Passage. The model results suggest that these fracture zones can influence the nature of the flow in the western Atlantic because of their control of the flow through the Drake Passage. The estimated volume transports through the Drake Passage based on the model results are in fair agreement with oceanic observations. Estimates of the spin-up time of the system for homogeneous and stratified cases have been provided. |
format |
Article in Journal/Newspaper |
author |
Boyer, Don L. Chen, Rui-Rong Tao, Lijun Davies, Peter A. |
author_facet |
Boyer, Don L. Chen, Rui-Rong Tao, Lijun Davies, Peter A. |
author_sort |
Boyer, Don L. |
title |
Physical model of bathymetric effects on the antarctic circumpolar current |
title_short |
Physical model of bathymetric effects on the antarctic circumpolar current |
title_full |
Physical model of bathymetric effects on the antarctic circumpolar current |
title_fullStr |
Physical model of bathymetric effects on the antarctic circumpolar current |
title_full_unstemmed |
Physical model of bathymetric effects on the antarctic circumpolar current |
title_sort |
physical model of bathymetric effects on the antarctic circumpolar current |
publishDate |
1993 |
url |
http://discovery.dundee.ac.uk/portal/en/research/physical-model-of-bathymetric-effects-on-the-antarctic-circumpolar-current(2eb9720d-1b36-4f14-95c5-b3d7d300a795).html https://doi.org/10.1029/92JC02254 http://hdl.handle.net/10588/2eb9720d-1b36-4f14-95c5-b3d7d300a795 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) ENVELOPE(89.183,89.183,-66.800,-66.800) ENVELOPE(-115.000,-115.000,-60.000,-60.000) |
geographic |
Antarctic Campbell Plateau Drake Passage Gaussberg Kerguelen Pacific Southeast Pacific Basin Southern Ocean The Antarctic |
geographic_facet |
Antarctic Campbell Plateau Drake Passage Gaussberg Kerguelen Pacific Southeast Pacific Basin Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
Boyer , D L , Chen , R-R , Tao , L & Davies , P A 1993 , ' Physical model of bathymetric effects on the antarctic circumpolar current ' Journal of Geophysical Research: Oceans , vol 98 , no. C2 , pp. 2587-2608 . DOI:10.1029/92JC02254 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/92JC02254 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
98 |
container_issue |
C2 |
container_start_page |
2587 |
op_container_end_page |
2608 |
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1766268469817376768 |