Développement d'un nouveau schéma de physique des nuages dans le modèle de méso-échelle MésoNH pour l'étude des interactions aérosol-nuage

Abstract : A set of 3D budget equations for aerosol particles acting as nuclei (CCN and IN) in the heterogeneous nucleation processes of cloud droplets and ice crystals have been developed in a 2-moment microphysical scheme of the mesoscale model MesoNH. CCN and IN are the nuclei that initiate and determine the concentrations of the small droplets and the pristine ice crystals. Consequently and in order to solve the radiative impacts of clouds at global scale with general circulation models, it is useful to evaluate the local impact of aerosol particles with cloud-resolving models that are able to integrate the activation processes of CCN and IN in a microphysical scheme. The budget equations of the aerosol particles computed in MesoNH, are based on the follow-up of prognostic concentrations of each mode of interstitial and activated CCN and IN. The budget focuses on the aerosol-cloud interactions. It considers the activation processes of polydisperse populations of CCN and IN, the impaction scavenging by falling raindrops, the transport of the particles, and so it is intended to reproduce the temporal and spatial variability of these nuclei. The sensibility of a cloud system to the parameterisation of ice heterogeneous nucleation is studied in the case of a mixed-phase orographic cloud. Then an idealised case of a squall line is simulated in order to illustrate the complex relationships existing between dynamics and cloud microphysics when polydisperse population of aerosol particles is considered.
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Sarah Berthet. Développement d'un nouveau schéma de physique des nuages dans le modèle de méso-échelle MésoNH pour l'étude des interactions aérosol-nuage. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00542807⟩

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