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Etude des flux turbulents à l'interface air-mer à partir de données de la plateforme OCARINA

Abstract : Exchanges of heat and momentum at the air-sea interface play a major role in the formation and the dynamics of water and air masses. In spite of decades of research, we still need to improve our knowledge of these exchanges, and more specifically our knowledge of turbulent fluxes, which are key variables in meteorological and climate models. In these models, sub-grid turbulent processes, thus turbulent fluxes also have to be modeled, which is mostly done with the Monin-Obukhov (1954, MOS hereafter) similarity theory. However, on the one hand, the use of a model implies that coefficients have to be adjusted. On the other hand, the model itself may require improvements. Unfortunately, obtaining flux estimates that have a good accuracy is a challenging effort, because of the intrusive effect of the platform, the limited accuracy the instruments, and because the instruments have their own sampling volume.Our study focuses on the estimation of turbulent fluxes at sea from measurements made with the new OCARINA platform (autonomous trimaran) during two campaigns : STRASSE 2012 and AMOP 2014. We analyze the characteristics of turbulence in the surface boundary layer, we estimate the turbulent fluxes by different methods, and compare the values of fluxes depending on environmental conditions, taking into account the sea state.
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https://hal-insu.archives-ouvertes.fr/tel-01401019
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Submitted on : Wednesday, January 4, 2017 - 5:26:09 PM
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  • HAL Id : tel-01401019, version 2

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Rémi Cambra. Etude des flux turbulents à l'interface air-mer à partir de données de la plateforme OCARINA. Sciences de la Terre. Université Paris-Saclay, 2015. Français. ⟨NNT : 2015SACLV024⟩. ⟨tel-01401019v2⟩

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