Sensitivity study of heavy precipitation in Limited Area Model climate simulations : influence of the size of the domain and the use of the spectral nudging technique
Colin, J. ; Déqué, M. ; Radu, R. ; Somot, S.
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.
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