A mass flux convection scheme for regional and global models
Un schéma de convection de flux de masse d'air pour des modèles globaux et régionaux
Bechtold, P. ; Bazile, E. ; Guichard, F. ; Mascart, P. ; Richard, E.
Année de publication
2001
<p>A bulk mass-flux convection parametrization for <br>deep and shallow convection is presented that includes an efficient and <br>straightforward treatment of numerics, moist thermodynamics and <br>convective downdraughts. The scheme is evaluated in a single-column <br>model context for a tropical deep-convective period and a trade-wind <br>cumulus case. Preliminary applications in a global numerical <br>weather-prediction model and a mesoscale model are also discussed. The<br> results suggest that the present scheme provides reasonable solutions <br>in terms of predicted rainfall, and tropical temperature and moisture <br>structures. The application of the scheme to various scales is supported<br> by the use of a convective available potential energy convective <br>closure that assures a smooth interaction with the large-scale <br>environment and efficiently suppresses conditional instability of the <br>second kind-like spin-up processes on the grid-scale. Finally, the theoretical and practical limits of the present approach are discussed together with possible future developments.</p></div>
Accès à la notice sur le site du portail documentaire de Météo-France