COUPLING QUASI-SPECTRAL MICROPHYSICS WITH MULTIPHASE CHEMISTRY : A CASE STUDY OF A POLLUTED AIR MASS AT THE TOP OF THE PUY DE DOME MOUNTAIN (FRANCE)

In this paper, we present a new development of the model from Leriche et al. (2000) with the incorporation of the coupling between this fully explicit multiphase chemistry model and a quasi-spectral microphysics model based upon Berry and Reinhardt's parameterization (1974a, 1974b). This new coupled model is applied to the chemical conditions already described in Leriche et al. (2000) using a maritime air mass more or less precipitating. In this coupling, collection, evaporation and sedimentation processes are considered. The microphysical scheme considers two categories of particles (cloud drops and raindrops) and aerosol particles are not taken into account. The present study aims at evaluating the role of microphysical processes in redistributing reactive species among the different phases and to quantify the change in gas budgets when considering multiphase chemistry together with microphysical processes.