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Modélisation et observation de la dynamique haute fréquence de la circulation du Golfe de Gascogne

Gaëlle Herbert 1 
1 ECOLA - Echanges Côte-Large
LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
Abstract : We analyse the variability of winter upper circulation in the southern Bay of Biscay from satellite and in situ observations and numerical simulations based on the SYMPHONIE code. We aim to get a better insight on the high frequency dynamics (a few hours to a few days) due to atmospheric forcing and estimate the adequacy of available tools to observe and simulate these processes. We first determine whether a coastal altimetric dataset (based on TOPEX/Poseidon and Jason-1 alongtrack data) can detect occurrences of a slope current (the Iberian Poleward Current, IPC). The results show the ability of altimetry to monitor IPC pulses under any atmospheric conditions or when the SST signature is weak, that makes it as an essential component for the IPC observing system in addition to satellite SST and mooring data. Then, we analyse the ocean response to storm Klaus that occurred on January 24th 2009 and its representation in a numerical simulation. More specifically, we characterize the response in temperature and salinity and the vertical mixing processes, the response in surface currents and the surge associated to the windstorm. The realism of the numerical simulation to represent these processes is evaluated by comparisons with satellite and in situ observations. Besides, a large part of the study is dedicated to improve the numerical simulations making several tests on parametrisations.
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Submitted on : Wednesday, November 21, 2012 - 1:56:26 PM
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  • HAL Id : tel-00755017, version 2

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Gaëlle Herbert. Modélisation et observation de la dynamique haute fréquence de la circulation du Golfe de Gascogne. Physique Atmosphérique et Océanique [physics.ao-ph]. Université Paul Sabatier - Toulouse III, 2012. Français. ⟨tel-00755017v2⟩

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