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Etude numerique des interactions courant/topographie: application au gyre subpolaire, aux seuils de Gibraltar et des mers Nordiques.

Abstract : The numerical representation of gravity currents and along-slope currents is very important to achieve realistic simulations of deep water masses and of the thermohaline circulation in the global ocean. Our goal is to improve the modelling of both current/topography interactions in the NEMO ocean general circulation model at eddy-permitting (1/4°) resolution. We show with idealized and realistic configurations that using a classical bottom boundary layer parameterization (downslope tracer advection and diffusion) improves the solutions but over-estimates overflow mixing downstream of the straits. A (systematic but weak) decrease of this parameterization's biaises is obtained by increasing local ageostrophic effects (parietal friction, momentum advection within the BBL). Our work suggests that this parameterization reaches its limits of application beyond the eddy-permitting regime.
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https://tel.archives-ouvertes.fr/tel-00730205
Contributor : Gaelle Hervieux <>
Submitted on : Friday, September 7, 2012 - 7:34:32 PM
Last modification on : Thursday, November 19, 2020 - 3:54:10 PM
Long-term archiving on: : Saturday, December 8, 2012 - 3:42:24 AM

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  • HAL Id : tel-00730205, version 1

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Gaelle Hervieux. Etude numerique des interactions courant/topographie: application au gyre subpolaire, aux seuils de Gibraltar et des mers Nordiques.. Océanographie. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00730205⟩

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