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Theses

Quantification de la vapeur d'eau troposphérique par GPS (modèles 2D et tomographies GPS) - Application aux précipitations intenses.

Abstract : The water vapour plays a unique role in the climate and the meteorology of the earth. It is a key variable to understand the convection and the intense precipitations. Now the quantitative precipitation forecast does not improve since about twenty years partly because the measure of the water vapour variability is a lack of the current observing systems. The accuracy of integrated water vapour GPS measurements has been shown since about ten years. The GPS tomography allows nowadays to retrieve the 3D field of water vapour.
This dissertation presents the theory (least square method and Kalman filtering), the validation and the applications of the GPS tropospheric tomography software LOFTT_K developed during this thesis. The tomography has been validated with simulations, meteorological modelling and independent measurements. The tomography has been then used to understand the small scale interactions between the local (the breezes) and mesoscale (the mistral) dynamics. The meteorological GPS has also allowed to characterize the humidity variations during rain events in the Cévennes (South France). Finally the GPS tomography at mesoscale has shown a mechanism of humidity « loading » of the atmosphere before a convection initiation case.
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https://tel.archives-ouvertes.fr/tel-00011387
Contributor : Cédric Champollion <>
Submitted on : Monday, January 30, 2006 - 11:22:48 AM
Last modification on : Tuesday, October 13, 2020 - 2:41:59 PM
Long-term archiving on: : Monday, September 20, 2010 - 2:09:26 PM

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  • HAL Id : tel-00011387, version 2

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Cédric Champollion. Quantification de la vapeur d'eau troposphérique par GPS (modèles 2D et tomographies GPS) - Application aux précipitations intenses.. Géophysique [physics.geo-ph]. Université Montpellier II - Sciences et Techniques du Languedoc, 2005. Français. ⟨tel-00011387v2⟩

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