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Simulating vertical mixing in a shelf-break region: addition of a shear instability model, accounting for the overall effect of internal tides, on top of a one-dimensional turbulence closure mixed layer model ArchiMer
Druon, Jean-noel; Langlois, G; Le Fevre, J.
A simple parameterization of eddy diffusivity is used to simulate the shear mixing from tidally induced internal waves generated in the continental slope region southwest of Brittany. Near the edge of the shelf, the seasonal thermocline oscillates under the forcing of the barotropic tide which propagates over the shelf break. A composite model is constructed to simulate the mixing of the upper ocean from both external (wind stress) and internal (internal waves) sources. A simple one-dimensional eddy kinetic energy model, which predicts the temperature profile from heat flux and wind stress inputs, is validated with respect to regional hydroelimatic conditions, then coupled with a two-layer model of non-linear internal waves, to simulate the mixing...
Tipo: Text Palavras-chave: 6 degrees W); Bay of Biscay (47 degrees N; ECWMF fluxes; Internal waves; Wind stress; Shelf break; Vertical mixing.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-5295.pdf
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Atlas mensuel des températures moyennes dans le golfe de Gascogne ArchiMer
Gohin, Francis; Langlois, G.
This study proposes a method for bathythermal analysis applied to the temperature profiles collected in the Bay of Biscay since 1950 and recorded at the French Hydrographic and Oceanographic Service of the Navy (SHOM). We consider the ocean variability, historically sampled with temperature measurements, from a geostatistical point of view. Thanks to an appropriate model of the thermal structures and using the "kriging" method, we proceed to monthly mean optimal estimations on a regular gridnet. For this purpose, we choose a random function model able to take several scales of phenomena into account. In practice, a structural analysis is first performed from the monthly files by computing the experimental variogram. Secondly, we exclude the incoherent...
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21249/18892.pdf
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