Challenges for a New Generation of Regional Forecast Models: Workshop on Concepts for Convective Parameterizations in Large-Scale Models III: Increasing Resolution and Parameterization; Warsaw, Poland, 17–19 March 2010

Authors

  • Jun-Ichi Yano,

    1. Groupe d'Etude de l'Atmosphère Météorologique, Centre National de Recherches Météorologiques/Centre National de la Recherche Scientifique, Météo-France, Toulouse, France
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  • Jean-Francois Geleyn,

    1. Groupe d'Etude de l'Atmosphère Météorologique, Centre National de Recherches Météorologiques/Centre National de la Recherche Scientifique, Météo-France, Toulouse, France
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  • Szymon Malinowski

    1. Institute of Geophysics and Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, Warsaw, Poland
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Abstract

Major European weather forecast centers are moving aggressively toward the horizontal mesh size of 1–5 kilometers with their regional models. Such a high horizontal resolution (convection-permitting limit) marginally resolves moist deep convection. To discuss new challenges for convection parameterization under such a limit, the European Cooperation in the Field of Scientific and Technical Research (COST) Action ES0905 organized a workshop in which 33 scientists from 14 European countries met at the Polish Academy of Sciences.

The participants found that in the convection-permitting limit, only one convective tower (a basic element of deep moist cumulus convection) would exist within a given grid box. A traditional notion of equilibrium within a standard framework no longer works. Evolution of a parameterized convective tower can be described only if it is directly coupled with the resolved flows.

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