SIMULATION OF SUMMER PRECIPITATION OVER NORTH CHINA IN 1991 AND 1994 WITH A NCAR REGIONAL CLIMATE MODEL
L Shi hua CHEN Yu chun (Lanzhou Institute of Plateau Atmospheric Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000)
We used a recent version of the regional climate model (RegCM2) developed at the National Center for Atmospheric Research (NCAR) to simulate summer precipitation over North China in 1991 and 1994 and to validate the capability for studying regional climate change. The RegCM2 is a modified version of the NCAR Pennsylvania State University Mesoscale Model (MM4) for climate application. The model vertical resolution is 14 levels and horizontal resolution is 40 km. The domain is centered at (100°E,37.5°N) and the total grids point is about 105×95. The simulation period is June to August in 1991 and 1994, and the initial and boundary condition come from ECMWF analyses of observations. The result indicates that the RegCM2 model can simulate reasonably well spatial patterns of the atmospheric circulation, precipitation, soil moisture and runoff in 1991 and 1994. There are the drought in 1991 and more rain in 1994 in North China. The model simulated wind vectors also agree with the observation reasonably well this two years. It shows that the model has good capability to study regional climate change in North China.