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Investigations of Application for the Regional Climate Model over East Asia

Zhao Zongci and Luo Yong (National Climate Center, China Meteorological Administration, Beijing 100081)  
A regional climate model over East Asia and the western Pacific Ocean (denoted as RegCM2/EA) has been set up based on the NCAR RegCM2 (1996 version). Several key issues of regional climate models over East Asia have been studied by using the RegCM2/EA, such as the effects of vertical resolutions; the actions of lateral boundary conditions (such as nesting methods, width of buffer zones and the different large-scale circulations). It is shown after a series of numerical experiments that the pattern of rainfall as simulated by the model with a fine vertical resolution was better than the coarse one; the different simulations of precipitation by the model nesting to the different large-scale lateral boundary fields were noticed; a large domain over East Asia needs a wider buffer zone of the model; the exponential relaxation is the best among six nesting methods. These results are useful to develop and improve the model in future for the predictions of summer monsoon rainfall. It is necessary to verify the results after the further numerical experiments.
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