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Développement d'un modèle de chimie multiphase couplé à un modèle de microphysique quasi-spectral : Application à un événement nuageux échantillonné au Puy de Dôme

Abstract : Clouds influence the oxidizing capacity of the troposphere and also, the radiative balance of the planet through the multiphase chemical processes which are still poorly understood. The aim of this work was to improve our understanding of the physico-chemical processes inside clouds. For this purpose, a numerical model of multiphase chemistry has been developed and coupled with a microphysical model (Berry and Reinhardt, 1974) based on the gas phase chemistry model of Madronich and Calvert (1990), the chemical mechanism of Jacob (1986), an exhaustive compilation of data from the literature and collaborations with kinetics researchers. In order to perform the necessary link for the understanding of the multiphase chemistry between experimental in situ data and laboratory data, the model in its non coupled version has been applied to a cloudy event sampled at the Puy de Dôme mountain (Voisin et al., 2000). These results show the ability of the model to reproduce generally observed behaviour and to analyse the reactivity of the cloud chemical system (Leriche et al., 2000a). In particular, a new oxidation pathway of S(IV) by pernitric acid into strong acid has been identified. Finally, the coupled model has been applied to the same cloudy event with a academic scenario in order to quantify the influence of the rain formation on the chemical regime previously described. The main results (Leriche et al., 2000b) show that the presence of clouds results in two different effects on the tropospheric chemistry: a direct effect of chemical species scavenging through mass transfer, solubility and reactivity, and an indirect effect through microphysical conversions of cloud water into rainwater which lead to the redistribution of reactive species between interstitial air, cloud water and rainwater.
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https://tel.archives-ouvertes.fr/tel-00481187
Contributor : Maud Leriche <>
Submitted on : Friday, May 7, 2010 - 9:24:44 PM
Last modification on : Friday, April 5, 2019 - 8:07:51 PM
Document(s) archivé(s) le : Thursday, September 16, 2010 - 1:12:59 PM

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  • HAL Id : tel-00481187, version 1

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Maud Leriche. Développement d'un modèle de chimie multiphase couplé à un modèle de microphysique quasi-spectral : Application à un événement nuageux échantillonné au Puy de Dôme. Océan, Atmosphère. Université Blaise Pascal - Clermont-Ferrand II, 2000. Français. ⟨tel-00481187⟩

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