| In this study,different single-moment and double-moment microphysical schemes by using the weather research and forecasting model(WRFV3.9 version)in order to simulate on a heavy precipitation process of Yangtze Valley River Basin during 30 June to 4 July 2016.Comparing the simulation effects of different single-moment and double-moment microphysical schemes on precipitation and cloud during this heavy precipitation process.First by using time series of China's automatic station and CMORPH precipitation products to simulate single-moment and double-moment schemes,FY-2G and Cloudsat cloud product also were used to evaluate the simulation different microphysical schemes of the cloud macroscale and microscale characteristics such as total cloud fraction and the vertical struction of cloud fraction and cloud water content in the precipitation process.And the main conclusions are as follow:(1)The simulation analysis of the heavy precipitation process using the WSM3 scheme shows that the water vapor is mainly from the Bay of Bengal,the high level east Asian subtropical upper-level jet stream and the low level southwest wind jet stream are coordinated,form a dry in the high level and wet in the low level circulation patterns.And the process of accumulation and release of convective effective potential energy.In the process of heavy precipitation,there is a strong vertical velocity and a basically corresponding convergence and divergence mechanism.Strong vertical velocity corresponds to strong apparent heat source and strong apparent moisture sink,and also accompanied by heavy precipitation.(2)For different single-moment and double-moment microphysical schemes,the WRF model can basically simulate the belt distribution and central rainfall intensity during the heavy precipitation process,but SBU-YLin and CAM 5.1 schemes show the simulation of heavy precipitation center is west and rainfall intensity is weak,the Kessler scheme shows that the simulation of heavy precipitation center is north and rainfall intensity is weak.By calculating the time correlation coefficient between the observation precipitation and the simulated precipitation on a five-day-by-hour basis,the results indicated that Goddard scheme and WSM5 scheme in the single-moment scheme have the best effect of simulation compared by the observation precipitation.The simulation of WDM5 and WDM6 in the double-moment scheme is consistent with the observation precipitation.(3)Except the Kessler scheme by the warm cloud scheme of single-moment scheme due to the insufficient description of the ice cloud process causing the simulation of total cloud fraction is significantly higher,other single-moment schemes and all double-parameter schemes can simulate temporal and spatial evolution characteristics of total cloud cover during the heavy precipitation process.From the vertical distribution characteristics of cloud coverage and cloud water content,the simulation stability of the group of single-moment schemes to the middle and low level warm clouds below 600 hPa are slightly better than the group of the double-moment schemes;The simulation results of the ice cloud between 200~500hPa were reversed,and the group of double-moment schemes was more concentrated than the group of single-moment.For the low level warm cloud precipitation process using the WSM3 scheme of single-moment scheme the cloud fraction is closer to the observation than the double-moment schemes,but the deep convection process that the cold cloud precipitation process as the main movement characteristics,using the WDM5 or WDM6 scheme of double-moment schemes the high cloud fraction is more stable and the error is smaller. |
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