Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics
Horizontal stirring by time-varying mesoscale flows contributes to forming submesoscale tracer filaments. In this paper, we propose a parameterization of the passive transport associated with filamentation by mesoscale flows for use in O(10 km) resolution ocean models. Theoretical motivations are pr...
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ftnerc:oai:nora.nerc.ac.uk:289515 2023-05-15T18:25:27+02:00 Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics Le Sommer, J. d’Ovidio, F. Madec, G. 2011 http://nora.nerc.ac.uk/id/eprint/289515/ unknown Le Sommer, J.; d’Ovidio, F.; Madec, G. 2011 Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics. Ocean Modelling, 39 (1-2). 154-169. https://doi.org/10.1016/j.ocemod.2011.03.007 <https://doi.org/10.1016/j.ocemod.2011.03.007> Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1016/j.ocemod.2011.03.007 2023-02-04T19:35:53Z Horizontal stirring by time-varying mesoscale flows contributes to forming submesoscale tracer filaments. In this paper, we propose a parameterization of the passive transport associated with filamentation by mesoscale flows for use in O(10 km) resolution ocean models. Theoretical motivations are provided for modelling subgrid stirring by the resolved mesoscale flows with an anisotropic generalization of Smagorinsky operator. For level coordinate models, an isoneutral formulation of the proposed subgrid operator is provided. The proposed subgrid operator is diagnosed with DRAKKAR global 1/4° eddy-resolving model output. In the Southern Ocean, the parameterization is shown to provide diffusivities peaking at about 400 m2 s−1. If applied prognostically, the proposed subgrid operator could drive meridional heat transports of about .5PW at 45°S. This suggests that a significant fraction of the transport by mesoscale flows could be associated with tracer features of scale smaller than our model grid size (not, vert, similar20 km at 45°S). A large contribution to this transport is associated with differential advection by the time-mean flow at subgrid scale. Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Ocean Modelling 39 1-2 154 169 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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Horizontal stirring by time-varying mesoscale flows contributes to forming submesoscale tracer filaments. In this paper, we propose a parameterization of the passive transport associated with filamentation by mesoscale flows for use in O(10 km) resolution ocean models. Theoretical motivations are provided for modelling subgrid stirring by the resolved mesoscale flows with an anisotropic generalization of Smagorinsky operator. For level coordinate models, an isoneutral formulation of the proposed subgrid operator is provided. The proposed subgrid operator is diagnosed with DRAKKAR global 1/4° eddy-resolving model output. In the Southern Ocean, the parameterization is shown to provide diffusivities peaking at about 400 m2 s−1. If applied prognostically, the proposed subgrid operator could drive meridional heat transports of about .5PW at 45°S. This suggests that a significant fraction of the transport by mesoscale flows could be associated with tracer features of scale smaller than our model grid size (not, vert, similar20 km at 45°S). A large contribution to this transport is associated with differential advection by the time-mean flow at subgrid scale. |
format |
Article in Journal/Newspaper |
author |
Le Sommer, J. d’Ovidio, F. Madec, G. |
spellingShingle |
Le Sommer, J. d’Ovidio, F. Madec, G. Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
author_facet |
Le Sommer, J. d’Ovidio, F. Madec, G. |
author_sort |
Le Sommer, J. |
title |
Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
title_short |
Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
title_full |
Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
title_fullStr |
Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
title_full_unstemmed |
Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics |
title_sort |
parameterization of subgrid stirring in eddy resolving ocean models. part 1: theory and diagnostics |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/289515/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Le Sommer, J.; d’Ovidio, F.; Madec, G. 2011 Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics. Ocean Modelling, 39 (1-2). 154-169. https://doi.org/10.1016/j.ocemod.2011.03.007 <https://doi.org/10.1016/j.ocemod.2011.03.007> |
op_doi |
https://doi.org/10.1016/j.ocemod.2011.03.007 |
container_title |
Ocean Modelling |
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39 |
container_issue |
1-2 |
container_start_page |
154 |
op_container_end_page |
169 |
_version_ |
1766206917977309184 |