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Tellus A: Dynamic Meteorology and Oceanography Volume 62, 2010 - Issue 5
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Original Articles

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

Jeanne ColinMétéo France CNRM/GMGEC CNRS/GAME, 31057 Toulouse France;Correspondence[email protected]
,
Michel DéquéMétéo France CNRM/GMGEC CNRS/GAME, 31057 Toulouse France;
,
Raluca RaduNational Meteorological Administration LNM, Bucharest, Romania
&
Samuel SomotMétéo France CNRM/GMGEC CNRS/GAME, 31057 Toulouse France;
Pages 591-604 | Received 27 Oct 2009, Accepted 21 May 2010, Published online: 15 Dec 2016
 
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Abstract

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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