Cette thèse porte sur l'étude des atmosphères de Titan et de la Terre primitive avec des modèles de circulation générale (GCM). Tout d'abord, j'ai analysé la structure thermique et la dynamique de la basse troposphère de Titan. Cette étude a abouti à une caractérisation complète de la couche limite et a révélé l'existence d'une circulation de couch...
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Modern coronographs offer the means to take full advantage of angular resolution provided by 8 to 10 meters class telescopes, allowing the exploration at high contrast of the inner parts of nearby planetary systems. A precursor of such a system is the Subaru Coronographic Extreme Ao project to which I contributed during the last 3 years. SCExAO use...
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Global Navigation Satellite Systems (GNSS) play a fundamental role in the elaboration of the International Terrestrial Reference Frame (ITRF). However, GNSS have so far not proven able to reliably determine the terrestrial scale nor the location of the Earth s center of mass (geocenter) and have thus not contributed to defining the ITRF scale nor i...
Quantification of the cloud frozen phase on a global basis is essential to fully capture and quantify the Earth energy budget and hydrological cycle. The estimation of frozen quantities from satellite remote sensing, however, is at a very early stage. The main reason is the complex variability of the cloud frozen phase and the lack of parameterizat...
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