Representation of cloud microphysical processes is one of the key aspects of numerical models. An improved double-moment bulk cloud microphysics scheme (named IMY) was created based on the standard Milbrandt-Yau (MY) scheme in the Weather Research and Forecasting (WRF) model for the East Asian monsoon region (EAMR). In the IMY scheme, the shape parameters of raindrops, snow particles, and cloud droplet size distributions are variables instead of fixed constants. Specifically, the shape parameters of raindrop and snow size distributions are diagnosed from their respective shape-slope relationships. The shape parameter for the cloud droplet size distribution depends on the total cloud droplet number concentration. In addition, a series of minor improvements involving detailed cloud processes have also been incorporated. The improved scheme was coupled into the WRF model and tested on two heavy rainfall cases over the EAMR. The IMY scheme is shown to reproduce the overall spatial distribution of rainfall and its temporal evolution, evidenced by comparing the modeled results with surface gauge observations. The simulations also successfully capture the cloud features by using satellite and ground-based radar observations as a reference. The IMY has yielded simulation results on the case studies that were comparable, and in ways superior to MY, indicating that the improved scheme shows promise. Although the simulations demonstrated a positive performance evaluation for the IMY scheme, continued experiments are required to further validate the scheme with different weather events.

Jinfang YIN;Donghai WANG;Guoqing ZHAI;Hong WANG;Huanbin XU;Chongjian LIU

State Key Laboratory of Severe Weather(LaSW),Chinese Academy of Meteorological Sciences,Beijing 100081,China;School of Earth Sciences,Zhejiang University,Hangzhou 310027,China;School of Atmospheric Sciences,Sun Yat-Sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082,China;Guangzhou Institute of Tropical and Marine Meteorology,China Meteorological Administration(CMA), Guangzhou 510080,China

大气科学进展（英文版）

[1]Jinfang YIN;Donghai WANG;Guoqing ZHAI;Hong WANG;Huanbin XU;Chongjian LIU-.A Modified Double-Moment Bulk Microphysics Scheme Geared toward the East Asian Monsoon Region)[J].大气科学进展（英文版）,2022(09):1451-1471

Microphysics,Geared,IMY,Milbrandt,EAMR

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