Seamless MESO-NH modeling over very large grids

Florian Pantillon (1) , Patrick Mascart (1) , Jean-Pierre Chaboureau (1) , Christine Lac (2) , Juan Escobar (3) , Jacqueline Duron (1)

1 LAERO - Laboratoire d'aérologie
2 CNRM - Centre national de recherches météorologiques
3 CEFE - Centre d’Ecologie Fonctionnelle et Evolutive

With the computing power it brings, the new generation of massively parallel computers allows one to perform a "seamless" modeling of weather on large grids, but it requires a large parallel computing capability for the models. Due to improvements in this direction in the meteorological model of the French research community MESO-NH, a computing performance of over 4 Teraflop/s was obtained with 130000 cores on the machine of the European computer center PRACE. This is a first in France for a weather code. A high resolution simulation, covering the Atlantic and Europe, of the tropical cyclone Helene and its interaction with a planetary wave was also conducted, for which the excellent result gives hope to an improved weather forecasting in Europe.

Mots clés: Informatique; algorithmique; Modèle de recherche météorologique; Simulations MESO-NH sans couture

Domaines: Météorologie; Calcul parallèle, distribué et partagé [cs.DC]; Modélisation et simulation

Florian Pantillon, Patrick Mascart, Jean-Pierre Chaboureau, Christine Lac, Juan Escobar, et al.. Seamless MESO-NH modeling over very large grids. Comptes Rendus Mécanique, 2011, 339 (2-3), pp.136-140. ⟨10.1016/j.crme.2010.12.002⟩. ⟨hal-01002009⟩