APPLICATION AND STUDY OF PRECIPITATION SCHEMES IN WEATHER  SIMULATION IN SUMMER AND WINTER OVER CHINA

Through simulation of summer and winter precipitation cases in China, the cloud-precipitation schemes of model were examined. Results indicate that it is discrepancy between convective precipitation simulated by the Kain Fritsch scheme and Betts-Miller scheme in summer, the former scheme is better than the later one in this case. The surrounding atmosphere may be varied by different convective schemes. The air is wetter and the updraft is stronger in the Kain-Fritsch than in the Betts Miller scheme, which can induce the more grid scale precipitation in the KainFritsch scheme. That means, the cumulus schemes difference may have the important effect on grid scale precipitation. However, there is almost no convective rain in winter in northern China, so the effect of cumulus precipitation to the grid scale can be disregarded. Therefore the grid scale precipitation is primary in winter of northern China.