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Développement et évaluation d'un modèle tridimensionnel de nuage mixte à microphysique détaillée : application aux précipitations orographiques

Abstract : The quantitative precipitation forecast is still an important challenge for the atmospheric community. Indeed, two main problems are generally identified for weather and climate models : the interactions of the cloud systems with the topography and with pollution. This work contributes towards the improvement of the precipitation forecasts. The strategy used was to study the convective system over an area with a complex topography using the detailed microphysics scheme DEtailed SCAvenging Model (DESCAM, Flossmann and Wobrock (2010)) to better describe the aerosol-cloud-precipitation interactions. This microphysical scheme follows the evolution of the aerosol particle, drop and ice crystal distributions. Aerosol mass in drops and ice crystals is predicted by two distributions functions in order to close the aerosol budget. The model simulation results are compared with observations from COPS campaign (Convective and Orographically induced Precipitation Study), which took place at the French-German boarder during summer 2007. Rain simulations were compared with available radar data to evaluate the model’s performances and help the interpretation of the radar reflectivity in the bright band level. Sensitivity with respect to the particulate pollution was studied for in-cloud and precipitation properties. For the cases studied, the higher the aerosol particle number in the atmosphere or the higher the solubility of the aerosol particles, the weakest are the precipitation at the ground. These global behaviours of precipitation on the ground could be locally different. Consequently, the aerosol-cloud-precipitation interactions are complex and more in-depth studies are necessary.
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https://tel.archives-ouvertes.fr/tel-00622980
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Submitted on : Thursday, February 23, 2012 - 3:17:26 PM
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2011CLF22136Planche.pdf
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  • HAL Id : tel-00622980, version 2

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Céline Planche. Développement et évaluation d'un modèle tridimensionnel de nuage mixte à microphysique détaillée : application aux précipitations orographiques. Sciences de la Terre. Université Blaise Pascal - Clermont-Ferrand II, 2011. Français. ⟨NNT : 2011CLF22136⟩. ⟨tel-00622980v2⟩

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