The Abdus Salam International Centre for Theoretical Physics (ICTP) Regional Climate Model (REGional Climate Model (RegCM3)) (Pal et al., 2007) was originally developed at the National Center for Atmospheric Research (NCAR) and has been widely applied to studies of regional climate and seasonal predictability around the world. The dynamical core of the RegCM is similar to that of the hydrostatic version of Mesoscale Model version 5 (MM5) (Grell et al., 1994). A number of physics parameterizations have been replaced however to improve the model ability to represent climate around the world. The changes are mostly in the areas of radiative transfer, representation of cloud and precipitation processes, gases and aerosols (including mineral dust) and land surface physics. Also new in the model is a mosaic-type parameterization of subgrid-scale heterogeneity in topography and land use (Giorgi et al., 2003).

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