Représentation des nuages chauds dans le modèle météorologique « MERCURE » : Application aux panaches d'aéroréfrigérants et aux précipitations orographiques

摘要

A two-moment semi-spectral warm microphysical scheme has been implemented inside the meteorological model “MERCURE”. A new formulation of the buoyancy flux () is proposed, which is coherent with the corrigendum of Mellor (1977) but differs from Bougeault (1981). The non-precipitating cloud microphysics is validated by comparing the numerical simulations of fifteen cases of cooling tower plumes with data from a measurement campaign in Bugey in 1980. Satisfactory results are obtained on the plumes shape, on the temperature and vertical velocity fields and on the droplets spectrums, although the liquid water contents tend to be overestimated. The precipitating cloud microphysics is tested by reproducing the academical cases of orographic precipitation of Chaumerliac et al. (1987) and Richard and Chaumerliac (1989). The simulations allow a check of the action of different microphysical terms.