Parameterization of eddy-induced subduction in the Southern Ocean surface-layer
The divergence of the eddy mass flux in the surface layer of the Southern Ocean makes an important contribution to subduction of fluid through the base of the mixed layer. Therefore, accurate parameterization of this process is needed to correctly represent the Southern Ocean ventilation in coarse-r...
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ftnerc:oai:nora.nerc.ac.uk:15157 2023-05-15T18:24:16+02:00 Parameterization of eddy-induced subduction in the Southern Ocean surface-layer Sallée, Jean-Baptiste Rintoul, Stephen R. 2011 http://nora.nerc.ac.uk/id/eprint/15157/ unknown Elsevier Sallée, Jean-Baptiste; Rintoul, Stephen R. 2011 Parameterization of eddy-induced subduction in the Southern Ocean surface-layer. Ocean Modelling, 39 (1-2). 146-153. https://doi.org/10.1016/j.ocemod.2011.04.001 <https://doi.org/10.1016/j.ocemod.2011.04.001> Marine Sciences Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1016/j.ocemod.2011.04.001 2023-02-04T19:29:40Z The divergence of the eddy mass flux in the surface layer of the Southern Ocean makes an important contribution to subduction of fluid through the base of the mixed layer. Therefore, accurate parameterization of this process is needed to correctly represent the Southern Ocean ventilation in coarse-resolution models. We test a common approach to the parameterization of eddy fluxes (Gent and McWilliams, 1990) using output from the 1/6 degrees eddy-permitting Southern Ocean State Estimate, which assimilates a variety of ocean observations using an adjoint method. When a constant diffusion coefficient of conventional magnitude O(1000 m(2) s(-1)) is used, the parameterized fluxes fail to reproduce the regional pattern and magnitude of eddy-driven subduction diagnosed from the model. However, when an appropriate choice is made for the diffusion coefficient, the parameterization does a good job of reproducing the distribution and strength of the eddy contribution to subduction. Using a spatially-varying coefficient is key to reproduce the regional pattern of the eddy-induced subduction. In addition, the magnitude of the subduction is correctly represented only with a diffusion coefficient that peaks at 10(4) m(2) s(-1) in the most energetic areas of the Southern Ocean, a factor of ten larger than commonly used in coarse-resolution climate models. Using a diffusion coefficient that is too small will underestimate the contribution of eddies to the ocean sequestration of heat, salt and carbon. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Ocean Modelling 39 1-2 146 153 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Sallée, Jean-Baptiste Rintoul, Stephen R. Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
topic_facet |
Marine Sciences |
description |
The divergence of the eddy mass flux in the surface layer of the Southern Ocean makes an important contribution to subduction of fluid through the base of the mixed layer. Therefore, accurate parameterization of this process is needed to correctly represent the Southern Ocean ventilation in coarse-resolution models. We test a common approach to the parameterization of eddy fluxes (Gent and McWilliams, 1990) using output from the 1/6 degrees eddy-permitting Southern Ocean State Estimate, which assimilates a variety of ocean observations using an adjoint method. When a constant diffusion coefficient of conventional magnitude O(1000 m(2) s(-1)) is used, the parameterized fluxes fail to reproduce the regional pattern and magnitude of eddy-driven subduction diagnosed from the model. However, when an appropriate choice is made for the diffusion coefficient, the parameterization does a good job of reproducing the distribution and strength of the eddy contribution to subduction. Using a spatially-varying coefficient is key to reproduce the regional pattern of the eddy-induced subduction. In addition, the magnitude of the subduction is correctly represented only with a diffusion coefficient that peaks at 10(4) m(2) s(-1) in the most energetic areas of the Southern Ocean, a factor of ten larger than commonly used in coarse-resolution climate models. Using a diffusion coefficient that is too small will underestimate the contribution of eddies to the ocean sequestration of heat, salt and carbon. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Sallée, Jean-Baptiste Rintoul, Stephen R. |
author_facet |
Sallée, Jean-Baptiste Rintoul, Stephen R. |
author_sort |
Sallée, Jean-Baptiste |
title |
Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
title_short |
Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
title_full |
Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
title_fullStr |
Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
title_full_unstemmed |
Parameterization of eddy-induced subduction in the Southern Ocean surface-layer |
title_sort |
parameterization of eddy-induced subduction in the southern ocean surface-layer |
publisher |
Elsevier |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/15157/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Sallée, Jean-Baptiste; Rintoul, Stephen R. 2011 Parameterization of eddy-induced subduction in the Southern Ocean surface-layer. Ocean Modelling, 39 (1-2). 146-153. https://doi.org/10.1016/j.ocemod.2011.04.001 <https://doi.org/10.1016/j.ocemod.2011.04.001> |
op_doi |
https://doi.org/10.1016/j.ocemod.2011.04.001 |
container_title |
Ocean Modelling |
container_volume |
39 |
container_issue |
1-2 |
container_start_page |
146 |
op_container_end_page |
153 |
_version_ |
1766204672083755008 |