A Simulating Study on Resolvable-Scale Microphysical Parameterization in a Mesoscale Model |
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| Authors: | Lin Wenshi Fong Soikun Wu Chisheng Ku Chimeng Wang Anyu and Yang Yan |
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| Institution: | Department of Atmospheric Sciences, Zhongshan University, Guangzhou 510275,Geophysical and Meteorological Observatory, Macao,Department of Atmospheric Sciences, Zhongshan University, Guangzhou 510275,Geophysical and Meteorological Observatory, Macao,Department of Atmospheric Sciences, Zhongshan University, Guangzhou 510275,Department of Atmospheric Sciences, Zhongshan University, Guangzhou 510275 |
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| Abstract: | The Penn State / NCAR Mesoscale Model (MM5) is used to simulate the precipitation event that occurred during 1-2 May 1994 to the south of the Yangtze River. In five experiments the Kain-Fritschscheme is made use of for the subgrid-scale convective precipitation, but five different resolvable-scalemicrophysicaI parameterisation schemes are employed. They are the simple super-saturation removalscheme, the warm rain scheme of Hsie et al. (1984), the simple ice scheme of Dudhia (1989), the complexmised-phase scheme developed by Reisner et al. (1993), and the GSFC microphysical scheme with graupel.our interest is how the various resolvable-scale schemes affect the domain-averaged precipitation, the precipitation distribution, the sea level pressure, the cloud water and the cloud ice. Through a series of experiments about a warm sector rainfall case, results show that although the different resolvable-scale scheme is used, the differences of the precipitation characteristics among all five runsare not very obvious. However. the precipitation is over-predicted and the strong mesoscale low is producedby the simple super-saturation removal scheme. The warm rain scheme with the inclusion of condensationand evaporation under-predicts the precipitation and allows the cloud water to reach the 3oo hPa level. Thescheme of the addition of graupel increases the resolvableescale precipitation by about 20%-30%. The inclusion of supercooled liquid water in the grid-scale scheme does not affect significantly the results. |
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| Keywords: | Mesoscate model Precipitation Resolvable-scale microphysical parameterization |
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