La Radiométrie Micro-onde Et Millimétrique Pour la Caractérisation Et Quantification Des Nuages de Glace Et de la Neige PDF Download

Author: Victoria Sol Galligani
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Languages : en
Pages : 0

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Book Description
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 parameterizations of their microphysical properties, and thus radiative properties. This thesis contributes to the development of the ice cloud remote sensing, by providing a better understanding of the sensitivity of microwave and millimeter satellite observations to the microphysical properties of the frozen phase, specifically snow. Current microwave and millimeter observations are interpreted via radiative transfer simulations, mainly for passive observations, but active measurements are also considered. Two main studies are pursued: (1) the analysis and interpretation of specific polarized scattering signatures over ice and snow clouds, and (2) the simulation of realistic passive and active microwave responses over ice and snow clouds, and their evaluation with satellite observations. Polarized observations are carefully analyzed with ancillary data and are interpreted with radiative transfer simulations, including the first polarized passive observations above 100GHz with Megha-Tropiques. Finally, the radiative transfer model is coupled to a meso- scale cloud model to simulate consistently coincident active and passive observations of real scenes, and assess the sensitivity of active and passive simulations to the different microphysical parameters.