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Provedor de dados:  ArchiMer
País:  France
Título:  Diagnosing Surface Mixed Layer Dynamics from High-Resolution Satellite Observations: Numerical Insights
Autores:  Ponte, Aurelien
Klein, Patrice
Capet, Xavier
Le Traon, Pierre-yves
Chapron, Bertrand
Lherminier, Pascale
Data:  2013-07
Ano:  2013
Palavras-chave:  Mesoscale processes
Ocean dynamics
Resumo:  High-resolution numerical experiments of ocean mesoscale eddy turbulence show that the wind-driven mixed layer (ML) dynamics affects mesoscale motions in the surface layers at scales lower than O(60 km). At these scales, surface horizontal currents are still coherent to, but weaker than, those derived from sea surface height using geostrophy. Vertical motions, on the other hand, are stronger than those diagnosed using the adiabatic quasigeotrophic (QG) framework. An analytical model, based on a scaling analysis and on simple dynamical arguments, provides a physical understanding and leads to a parameterization of these features in terms of vertical mixing. These results are valid when the wind-driven velocity scale is much smaller than that associated with eddies and the Ekman number (related to the ratio between the Ekman and ML depth) is not small. This suggests that, in these specific situations, three-dimensional ML motions (including the vertical velocity) can be diagnosed from high-resolution satellite observations combined with a climatological knowledge of ML conditions and interior stratification.
Tipo:  Text
Idioma:  Inglês

Editor:  Amer Meteorological Soc
Formato:  application/pdf
Fonte:  Journal Of Physical Oceanography (0022-3670) (Amer Meteorological Soc), 2013-07 , Vol. 43 , N. 7 , P. 1345-1355
Direitos:  2013 American Meteorological Society

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