Unidirectional integration of limited area models driven at the boundaries by GCMs is becoming a very useful technique to increase the resolution of climate simulations. This type of models allow for long term integrations at high spatial resolution, while it is greatly reducing the computation time required. RCM are now used in many climate research centers around the world. The Canadian Regional Climate Models (CRCM) originates from the coupling of the semi-Lagangian and semi-implicit dynamical core MC2 (Mesoscale Compressible Community Model; Laprise et al., 1997) with an ensemble of parameterizations describing physical processes which originate from the second generation Canadian GCM (McFarlane et al. 1992). This high-resolution model can perform climate simulations anywhere in the world; one only needs to specify the geographical coordinates of the grid and the model makes all the necessary adjustment. Since the CRCM is a regional model, it is necessary to specify boundary conditions at the lateral and lower boundaries; this procedure is called nesting. Inside the selected area, the CRCM can simulate its « own » climate. The equations describing the CRCM can be found in Caya et al. (1995, 1999).
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Laprise, R., D. Caya, G. Bergeron and M. Giguère, 1997: The formulation of André Robert MC2 (Mesoscale Compressible Community) model. Atmos.-Ocean 35 (1), 195-220.
McFarlane, N.A., G.J. Boer, J.-P. Blanchet and M. Lazare, 1992: The Canadian Climate Centre second generation General Circulation Model and its equilibrium climate. J. Clim. 5 (10), 1013-1044.