Effect of Different Microphysical Parameterizations on the Simulations of a South China Heavy Rainfall |
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| Authors: | ZHOU Zhi-min HU Yang WANG Bin YIN Jin-fang GUO Ying-lian KANG Zhao-ping and SUN Yu-ting |
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| Institution: | Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China,Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China,Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China,State Key Laboratory of Sever Weather, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100082 China,Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China,Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China and Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430206 China |
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| Abstract: | A heavy rainfall event in south China was simulated by the Weather Research and Forecasting (WRF) model
with three microphysics schemes, including the Morrison scheme, Thompson scheme, and Milbrandt and Yau scheme
(MY), which aim to evaluate the capability to reproduce the precipitation and radar echo reflectivity features, and to
evaluate evaluate their differences in microphysics and the associated thermodynamical and dynamical feedback. Results
show that all simulations reproduce the main features crucial for rainfall formation. Compared with the observation, the
MY scheme performed better than the other two schemes in terms of intensity and spatial distribution of rainfall. Due to
abundant water vapor, the accretion of cloud droplets by raindrops was the dominant process in the growth of raindrops
while the contribution of melting was a secondary effect. Riming processes, in which frozen hydrometeors collect cloud
droplets mainly, contributed more to the growth of frozen hydrometeors than the Bergeron process. Extremely abundant
snow and ice were produced in the Thompson and MY schemes respectively by a deposition process. The MY scheme
has the highest condensation and evaporation, but the lowest deposition. As a result, in the MY scheme, the enhanced
vertical gradient of condensation heating and evaporation cooling at low levels produces strong positive and weak
negative potential vorticity in Guangdong, and may favor the formation of the enhanced rainfall center over there. |
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| Keywords: | heavy rainfall microphysical parameterization hydrometeor budget diabatic heating |
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