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La dynamique à sousmésoéchelle sur le plateau continental du Golfe de Gascogne ArchiMer
Yelerci, Ozge.
This thesis explores the submesoscale dynamics in the Bay of Biscay continental shelf. In the first part, submesoscale features over the shelf are identified using remotely sensed high resolution sea surface temperature (SST) images by MODIS. Front detection is achieved through singularity exponents, a novel method of calculating irregularities on the SST fields, and an index for the frontal activity is generated. Results are complemented with 2.5 km horizontal resolution numerical simulations. Three main types of fronts are presented: i) tidal mixing fronts along the coast and most significantly in the Ushant region; ii) shelf break front related to internal tidal wave activity; iii) fresh water fronts along the edge of the river plumes in winter. In the...
Tipo: Text Palavras-chave: Dynamique à sousmésoéchelle; Modèle numérique océanique a haute résolution; Golfe de gascogne; Exposants de singularité; Données satellites de température de surface de la mer; Submesoscale dynamics; Fronts; Bay of Biscay.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00497/60910/64259.pdf
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The Vertical Pump Organized by the Mesoscale Oceanic Eddies ArchiMer
Klein, Patrice; Hua, Bach-lien; Le Gentil, Sylvie; Sasaki, Hideharu.
The purpose of this project is to study the dynamics of the upper oceanic layers (the first 1000m below the surface) and principally to get new insights on the effectiveness of the oceanic vertical pump at a basin scale through numerical experiments using ultra-high resolution. If the magnitude of this vertical pump when using such a resolution is much larger than anticipated, then the expected results should have an important impact on basin-scale SST and circulation through the vertical fluxes of heat and potential vorticity. Indeed preliminary studies already indicate the significant contribution of this eddy vertical pump to the modification of the surface layers heat content ([1], [2]). Thus the expected new results should be of importance for climate...
Tipo: Text Palavras-chave: Mesoscale oceanic eddies; Submesoscale dynamics; Vertical pump.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00067/17782/15304.pdf
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