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
deep and shallow convection is presented that includes an efficient and
straightforward treatment of numerics, moist thermodynamics and
convective downdraughts. The scheme is evaluated in a single-column
model context for a tropical deep-convective period and a trade-wind
cumulus case. Preliminary applications in a global numerical
weather-prediction model and a mesoscale model are also discussed. The
results suggest that the present scheme provides reasonable solutions
in terms of predicted rainfall, and tropical temperature and moisture
structures. The application of the scheme to various scales is supported
by the use of a convective available potential energy convective
closure that assures a smooth interaction with the large-scale
environment and efficiently suppresses conditional instability of the
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>
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