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Cycle de l'eau martien : nuages et vapeur, observables et modèles, vers la haute résolution

Abstract : The global climate model (GCM) of the Laboratoire de Météorologie Dynamique is used to study the Martian water cycle. Available observations are compared to simulations to unravel the physical phenomena affecting the cycle, with a focus on clouds and water vapor. New inversions of water vapor observations are described and analyzed, to further our understanding of the cycle and of its interannual variability. Such comparisons are limited by bias that have to be studied. Observations constrain the timing, thickness and cover of the clouds. To improve the water cycle simulation and understanding, new high-resolution simulations with an horizontal resolution of one degree are shown. New phenomena appear, like spiral storms. The water cycle undergoes visible changes, with wave transitions, strengthened instabilities, shifts in frost deposition and a better simulation of the condensation and sublimation seasonal processes. The circulation is strengthened, as is variability. The atmosphere is wetter, more cloudy and more variable. Following the details discovered in the high-resolution simulations, we try to improve the representation of cloud cover in the standard resolution simulations. The subsequent new subgrid-scale parametrization of partial cloudiness is described, and its consequences on the water cycle are analyzed. Results are promising as the model agrees more with observations in some ways, but the parametrization causes further instability.
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https://tel.archives-ouvertes.fr/tel-01528574
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Submitted on : Monday, May 29, 2017 - 11:55:41 AM
Last modification on : Friday, May 29, 2020 - 4:00:30 PM
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  • HAL Id : tel-01528574, version 1

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Alizée Pottier. Cycle de l'eau martien : nuages et vapeur, observables et modèles, vers la haute résolution. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066539⟩. ⟨tel-01528574⟩

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