ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Numerical Simulation of a Squall Line in Hainan Island by Different Cloud Microphysical Schemes
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Abstract:
Eight different cloud microphysics schemes in the WRF model are used to simulate the precipitation process of a squall line that occurred in Hainan Island on 22 April 2020, and the effects of different cloud microphysics schemes on the simulation of the Hainan Island squall line are compared and analyzed. The results show that different cloud microphysics schemes have significant differences in the simulation of surface precipitation, radar composite reflectivity and thermal dynamic field. Among them, the intensity of precipitation area and center simulated by Thompson scheme are most close to the actual observations, and the radar composite reflectivity simulated by WSM6 scheme at the time of maximum precipitation is similar to the actual observations in intensity, range and form. In the thermal dynamic field, the characteristics of squall line such as surface cold pool, low-level vertical wind shear and cold pool outflow are simulated by each scheme,and the precipitation center is corresponded to the strong updraft region. The divergence structure of low-level convergence and high-level divergence is conducive to the occurrence of strong convection and the formation of precipitation, but the intensity and distribution are different. According to the cloud microphysical characteristics, the liquid phase particles are mainly distributed below 5 km, and the ice phase particales are above 6 km. The simulation results of cloud water show the weakest response to the selection of cloud microphysics schemes, while the distributions of snow and graupel show the high sensitivity.
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Project Supported:
The National Natural Science Foundation of China (42365011), National Key Research and Development Program (2023YFC3007600), Innovation and Development Project of China Meteorological Administration (CXFZ2023J039) and Natural Science Foundation of Hainan Province (22QN424) (420RC754) (421QN372)
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