Impact of Different Cloud Microphysical Schemes on Meiyu Fronts Precipitation
摘要
Aiming at the applicability of cloud microphysical schemes in the simulating the Meiyu front precipitation, we simulate some Meiyu front precipitation events from East China to the Sea of Japan using the WRFV4 model. Through the sensitivity study of four frequently-used cloud microphysical schemes, such us Kessler scheme, WSM6, Goddard, and WDM6 scheme, to the Meiyu front precipitation forecast, it is concluded that the four microphysical schemes show small differences in rain rates and rain distributions. The Kessler scheme and the WSM6 scheme overestimate the precipitation of greater than 25 mm. The WSM6 and WDM6 schemes can better simulates the downpour rain than other schemes. Compared with the Kessler scheme, WSM6, Goddard, and WDM6 schemes have lower convective available potential energy and less precipitable water. The Goddard scheme produces larger radar reflectivity than other schemes. The cloud-water mixing ratios and rain-water mixing ratios simulated by the Kessler scheme lie in higher layer than those by other schemes. The Equitable Threat Score and Bias scores of the WDM6 are better than those of Kessler, WSM6, Goddard scheme with 3 km resolution at the 24th hour. So, we suggest that the WDM6 scheme should be used when the Meiyu front precipitation is predicted.