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《大气科学进展(英文版)》 2002-01
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Effects of Nested Area Size upon Regional Climate Model Simulations

Lu Huaqiang Laboratory for Meteorological Disasters and Environmental Change, Nanjing Institute of Meteorology, Nanjing 210044 Qian Yongfu Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 Zheng Yiqun Nanjing Institute of Geography a  
This paper presents a numerical study on the 1998 summer rainfall over the Yangtze River valley in central and eastern China, addressing effect of a nested area size on simulations in terms of the technique of nesting a regional climate model (RCM) upon a general circulation model (GCM). Evidence suggests that the size exerts greater impacts upon regional climate of the country, revealing that a larger nested size is superior to a small one for simulation in mitigating errors of GCM-provided lateral boundary forcing. Also, simulations show that the RCM should incorporate regions of climate systems of great importance into study and a low-resolution GCM yields more pronounced errors as a rule when used in the research of the Tibetan Plateau, and, in contrast, our PORCM can do a good job in describing the plateau's role in a more realistic and accurate way. It is for this reason that the tableland should be included in the nested area when the RCM is employed to investigate the regional climate. Our PJRCM nesting upon a GCM reaches more realistic results compared to a single GCM used.
【Fund】: This work was supported by the National Natural Science Foundation of China under Grant No. 49735170.
【CateGory Index】: P462
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