Colin J.,Meteo - France |
DeQue M.,Meteo - France |
Radu R.,National Meteorological Administration LNM |
Somot S.,Meteo - France
Tellus, Series A: Dynamic Meteorology and Oceanography | Year: 2010
We assess the impact of two sources of uncertainties in a limited area model (LAM) on the representation of intense precipitation: the size of the domain of integration and the use of the spectral nudging technique (driving of the large-scale within the domain of integration). We work in a perfect-model approach where the LAM is driven by a general circulation model (GCM) run at the same resolution and sharing the same physics and dynamics as the LAM. A set of three 50 km resolution simulations run over Western Europe with the LAM ALADIN-Climate and the GCM ARPEGE-Climate are performed to address this issue. Results are consistent with previous studies regarding the seasonal-mean fields. Furthermore, they show that neither the use of the spectral nudging nor the choice of a small domain are detrimental to the modelling of heavy precipitation in the present experiment. ©2010 The Authors Tellus A © 2010 International Meteorological Institute in Stockholm.