Comparison of Microphysical Characteristics of Warm-sector, Frontal and Shearline Heavy Rainfall During the Pre-summer Rainy Season in South China |
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| Authors: | XIA Feng LIU Xian-tong HU Sheng LI Hui-qi RAO Xiao-n LIN Qing XIAO Hui FENG Lu and LAI Rui-ze |
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| Institution: | 1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,2. Guangdong Meteorological Observatory, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China,1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China and 1. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641 China |
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| Abstract: | Warm-sector heavy rainfall (WR), shear-line heavy rainfall (SR), and frontal heavy rainfall (FR) are three types of rainfall that frequently occur during the pre-summer rainy season in south China. In this research, we investigated the differences in microphysical characteristics of heavy rainfall events during the period of 10-15 May 2022 based on the combined observations from 11 S-band polarimetric radars in south China. The conclusions are as follows: (1) WR has the highest radar echo top height, the strongest radar echo at all altitudes, the highest lightning density, and the most active ice-phase process, which suggests that the convection is the most vigorous in the WR, moderate in the FR, and the weakest in the SR. (2) Three types of rainfall are all marine-type precipitation, the massweighted mean diameter (Dm, mm) and the intercept parameter (Nw, mm-1 m-3 ) of the raindrops in the WR are the largest. (3) The WR possesses the highest proportion of graupel compared with the FR and SR, and stronger updrafts and more abundant water vapor supply may lead to larger raindrops during the melting and collision-coalescence processes. (4) Over all the heights, liquid and ice water content in the WR are higher than those in the SR and FR, the ratio of ice to liquid water content in the WR is as high as 27% when ZH exceeds 50 dBZ, definitely higher than that in the SR and FR, indicating that the active ice-phase process existing in the WR is conducive to the formation of heavy rainfall. |
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| Keywords: | microphysical characteristic S-band polarimetric radar warm-sector heavy rainfall frontal heavy rainfall shear-line heavy rainfal |
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