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Modélisation petite échelle de l'atmosphère de Vénus : convection et onde de gravité

Abstract : The observations made by the mission Venus Express and Akatsuki gave unprecedented insight of the turbulence of the atmosphere of Venus. The vertical extension of the cloud convective layer as well as the variability with latitude and local time has been studied, small-scale gravity waves have been observed both above and below this convection layer. Despite a stable atmosphere, cellular features have been observed at the top of the cloud at low latitude at noon. Recently large stationnary bow-shape waves have been measured above the main topographic features at low latitude. Despite these observations, some questions remain. In order to address these questions we used the WRF dynamical core to be able to resolve smallscale turbulence. With Large-Eddy Simulations (LES), simulations were performed to resolve the convective activity of the could layer and the induced gravity waves. With the mesoscale mode, high-resolution topography produces stationary bow-shape waves with amplitude and latitudinal extension consistent with observations.
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  • HAL Id : tel-02924996, version 1

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Maxence Lefèvre. Modélisation petite échelle de l'atmosphère de Vénus : convection et onde de gravité. Planétologie. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS475⟩. ⟨tel-02924996⟩

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