Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics
Le Sommer, J., d’Ovidio, F. and Madec, G. (2011) Parameterization of subgrid stirring in eddy resolving ocean models. Part 1: Theory and diagnostics. Ocean Modelling, 39, (1-2), 154-169. (doi:10.1016/j.ocemod.2011.03.007).
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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.
|Keywords:||Lateral mixing; Anisotropic diffusion; Eddy resolving ocean models; Large eddy simulation|
|Subjects:||G Geography. Anthropology. Recreation > GC Oceanography|
|Divisions:||University Structure - Pre August 2011 > National Oceanography Centre (NERC)
National Oceanography Centre (NERC) > Marine Systems Modelling
|Date Deposited:||02 Jun 2011 11:58|
|Last Modified:||01 Sep 2011 01:38|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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