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Estimation des paramètres atmosphériques par GPS: analyse de la variabilité spatio-temporelle de la vapeur d'eau

Abstract : The atmospheric water vapor plays an important role in meteorological processes. However, its spatial and temporal variability has been a brake on its study up to the 90s. From then on, researchers were able to highlight the potential of GPS (Global Positioning System) as an instrument to study the humidity. Two different results can be found. A 2D distribution of humidity through integrated values over a GPS network or a 3D distribution of the density of water vapor through tomographic GPS software. First, this thesis explains the development, the tests and the validation of our GPS tomographic software developed in the Laboratory for meteorological physics (LaMP, France) dedicated to the scientific GPS community. This software uses only GPS data from rinex files and complementary files from ground meteorological data. No external constraints are used in order to retrieve the 3D repartition of water vapor density. Then, this thesis presents operational applications of the software through three GPS campaigns. The first tomographic results concern OHMCV (Observatoire Hydrométéorologique des Cévènnes-Vivarais) GPS campaign which took place in autumn 2002 in southern France. The second tomographic results concern the permanent GPS network of IRMB (Royal Meteorological Institute of Belgium) through various cases in 2005. Finally, the third tomographic results concern COPS campaign (Convective and Orographically-induced Precipitation Study) which took place during the summer of 2007 in Europe. All those tomographic results have been compared with reflectivity data from several weather radar to better understand the role of water vapor as a precursor of convective initiation.
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Mathieu Reverdy. Estimation des paramètres atmosphériques par GPS: analyse de la variabilité spatio-temporelle de la vapeur d'eau. Physique Atmosphérique et Océanique [physics.ao-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2008. Français. ⟨NNT : 2008CLF21903⟩. ⟨tel-00731533⟩

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