3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current
The meridional Ekman transport in a zonally reentrant channel may be balanced by diabatic circulations, standing eddies associated with topography, or by Lagrangian mean eddy mass fluxes. A simple model is used to explore the interaction between these mechanisms. A key assumption of this study is th...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.143.7361 2023-05-15T14:02:18+02:00 3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current Robert Hallberg The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7361 http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7361 http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.pdf text 2000 ftciteseerx 2016-01-07T15:03:15Z The meridional Ekman transport in a zonally reentrant channel may be balanced by diabatic circulations, standing eddies associated with topography, or by Lagrangian mean eddy mass fluxes. A simple model is used to explore the interaction between these mechanisms. A key assumption of this study is that diabatic forcing in the poleward edge of the channel acts to create lighter fluid, as is the case with net freshwater fluxes into the Southern Ocean. For weak wind forcing or strong diabatic constraint, a simple scaling argument accurately predicts the level of baroclinic shear. However, given our understanding of the relative magnitudes of Ekman flux and deep upwelling, this is not the appropriate parameter range for the Antarctic Circumpolar Current. With stronger wind stresses, eddies are prominent, with baroclinic instability initially developing in the vicinity of large topography. Arguments have been advanced by a number of authors that baroclinic instability should limit the velocity shear, leading to a stiff upper limit on the transport of the current. However, in the simulations presented here baroclinic instability is largely confined to the region of topographic highs, and the approach to a current that is independent of the wind stress occurs gradually. Several recent parameterizations of transient eddy fluxes do not reproduce key features of the observed behavior. 1. Text Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean The Antarctic |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
The meridional Ekman transport in a zonally reentrant channel may be balanced by diabatic circulations, standing eddies associated with topography, or by Lagrangian mean eddy mass fluxes. A simple model is used to explore the interaction between these mechanisms. A key assumption of this study is that diabatic forcing in the poleward edge of the channel acts to create lighter fluid, as is the case with net freshwater fluxes into the Southern Ocean. For weak wind forcing or strong diabatic constraint, a simple scaling argument accurately predicts the level of baroclinic shear. However, given our understanding of the relative magnitudes of Ekman flux and deep upwelling, this is not the appropriate parameter range for the Antarctic Circumpolar Current. With stronger wind stresses, eddies are prominent, with baroclinic instability initially developing in the vicinity of large topography. Arguments have been advanced by a number of authors that baroclinic instability should limit the velocity shear, leading to a stiff upper limit on the transport of the current. However, in the simulations presented here baroclinic instability is largely confined to the region of topographic highs, and the approach to a current that is independent of the wind stress occurs gradually. Several recent parameterizations of transient eddy fluxes do not reproduce key features of the observed behavior. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Robert Hallberg |
spellingShingle |
Robert Hallberg 3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
author_facet |
Robert Hallberg |
author_sort |
Robert Hallberg |
title |
3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
title_short |
3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
title_full |
3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
title_fullStr |
3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
title_full_unstemmed |
3312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 31 An Exploration of the Role of Transient Eddies in Determining the Transport of a Zonally Reentrant Current |
title_sort |
3312 journal of physical oceanography volume 31 an exploration of the role of transient eddies in determining the transport of a zonally reentrant current |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7361 http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.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_source |
http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7361 http://www.gfdl.noaa.gov/reference/bibliography/2001/rwh0101.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766272512565444608 |