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Theses

Modélisation numérique des cycles de l'eau et des poussières de la planète Mars et de leurs couplages

Abstract : This thesis focuses on the improvement of the representation of the atmosphere of the planet Mars by the martian Global Climate Model (GCM) of the Laboratoire de Météorologie Dynamique (LMD). The martian GCM developped at LMD in collaboration with several european teams (LATMOS, IAA Grenade, University of Oxford, The Open University) and with the support of ESA and CNES is used for many applications. This model aims at forecasting the detailed behaviour of the martian climate described by the cycles of carbon dioxyde, of water, of dust so as photochemistry, essentially based on universal equations. The comparison of GCM simulations with the available observations allows their interpretation, and sometimes reveals that some climatic processes are poorly modeled. These problematic processes notably result from the action of sub-grid scale mechanisms, meaning they are not directly resolved by the model. The work of this thesis consists in studying and parametrizing the effect of some of these mechanisms. With the help of the analysis and modeling of these processes, we try to correct the model's defects regarding the vertical distribution of water vapour and water ice, so as the exchanges with the surface, the vertical distribution of dust, with notably the modeling of the detached dust layers, and of course the effect of their couplings. Furthermore, we focus on the sub-grid scale processes of the atmosphere, which can significantly impact the global circulation, in particular the non-orographic gravity waves, which I have studied by analysing MAVEN mission observations.
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Margaux Vals. Modélisation numérique des cycles de l'eau et des poussières de la planète Mars et de leurs couplages. Planétologie. Université Pierre et Marie Curie (Paris 6), 2019. Français. ⟨tel-02466083⟩

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