Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning
The article of record as published may be found at http://dx.doi.org/10.1175/2010JPO4538.1 An analytical model of the Atlantic deep stratification and meridional overturning circulation is presented that illustrates the dynamic coupling between the Southern Ocean and the midlatitude gyres. The model...
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ftnavalpschool:oai:calhoun.nps.edu:10945/42131 2024-06-09T07:40:22+00:00 Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning Radko, Timour Kamenkovich, Igor Oceanography 2011-04 application/pdf https://hdl.handle.net/10945/42131 unknown Journal of Physical Oceanography, Volume 41, pp. 757-780, April 2011. https://hdl.handle.net/10945/42131 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Article 2011 ftnavalpschool 2024-05-15T00:47:40Z The article of record as published may be found at http://dx.doi.org/10.1175/2010JPO4538.1 An analytical model of the Atlantic deep stratification and meridional overturning circulation is presented that illustrates the dynamic coupling between the Southern Ocean and the midlatitude gyres. The model, expressed here in terms of the two-and-a-half-layer framework, predicts the stratification and meridional transport as a function of the mechanical and thermodynamic forcing at the sea surface. The approach is based on the classical elements of large-scale circulation theory—ideal thermocline, inertial western boundary currents, and eddy-controlled Antarctic Circumpolar Current (ACC) models—which are combined to produce a consistent three-dimensional view of the global overturning. The analytical tractability is achieved by assuming and subsequently verifying that the pattern of circulation in the model is largely controlled by adiabatic processes: the time-mean and eddy-induced isopycnal advection of buoyancy. The mean stratification of the lower thermocline is determined by the surface forcing in the ACC and, to a lesser extent, by the North Atlantic Deep Water formation rate. Although the vertical small-scale mixing and the diapycnal eddyflux components can substantially influence the magnitude of overturning, their effect on the net stratification of the midlatitude ocean is surprisingly limited. The analysis in this paper suggests the interpretation of the ACC as an active lateral boundary layer that does not passively adjust to the prescribed large-scale solution but instead forcefully controls the interior pattern. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Naval Postgraduate School: Calhoun Antarctic Southern Ocean |
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Naval Postgraduate School: Calhoun |
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description |
The article of record as published may be found at http://dx.doi.org/10.1175/2010JPO4538.1 An analytical model of the Atlantic deep stratification and meridional overturning circulation is presented that illustrates the dynamic coupling between the Southern Ocean and the midlatitude gyres. The model, expressed here in terms of the two-and-a-half-layer framework, predicts the stratification and meridional transport as a function of the mechanical and thermodynamic forcing at the sea surface. The approach is based on the classical elements of large-scale circulation theory—ideal thermocline, inertial western boundary currents, and eddy-controlled Antarctic Circumpolar Current (ACC) models—which are combined to produce a consistent three-dimensional view of the global overturning. The analytical tractability is achieved by assuming and subsequently verifying that the pattern of circulation in the model is largely controlled by adiabatic processes: the time-mean and eddy-induced isopycnal advection of buoyancy. The mean stratification of the lower thermocline is determined by the surface forcing in the ACC and, to a lesser extent, by the North Atlantic Deep Water formation rate. Although the vertical small-scale mixing and the diapycnal eddyflux components can substantially influence the magnitude of overturning, their effect on the net stratification of the midlatitude ocean is surprisingly limited. The analysis in this paper suggests the interpretation of the ACC as an active lateral boundary layer that does not passively adjust to the prescribed large-scale solution but instead forcefully controls the interior pattern. |
author2 |
Oceanography |
format |
Article in Journal/Newspaper |
author |
Radko, Timour Kamenkovich, Igor |
spellingShingle |
Radko, Timour Kamenkovich, Igor Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
author_facet |
Radko, Timour Kamenkovich, Igor |
author_sort |
Radko, Timour |
title |
Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
title_short |
Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
title_full |
Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
title_fullStr |
Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
title_full_unstemmed |
Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning |
title_sort |
semi-adiabatic model of the deep stratification and meridional overturning |
publishDate |
2011 |
url |
https://hdl.handle.net/10945/42131 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
op_relation |
Journal of Physical Oceanography, Volume 41, pp. 757-780, April 2011. https://hdl.handle.net/10945/42131 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801383784771223552 |