Precipitation Microphysical Characteristics of Typhoon Ewiniar(2018) before and after Its Final Landfall over Southern China  

作　　者：Lu FENG Hui XIAO Xiantong LIU Sheng HU Huiqi LI Liusi XIAO Xiao HAO 

机构地区：[1]Guangzhou Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510641,China [2]Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,China Meteorological Administration,Guangzhou 510641,China [3]Guangzhou Meteorological Observatory,China Meteorological Administration,Guangzhou 511430,China

出　　处：《Advances in Atmospheric Sciences》2023年第6期1005-1020,共16页大气科学进展（英文版）

基　　金：jointly supported by Guangdong Basic and Applied Basic Research Foundation (2021A1515011415);the National Natural Science Foundation of China (Grant Nos. 42075086, 41975138, and 42005062);the Natural Science Foundation of Guangdong Province, China (2019A1515010814)。

摘　　要：In this paper, the evolution of the microphysical characteristics in different regions(eyewall, inner core, and outer rainbands) and different quadrants [downshear left(DL), downshear right(DR), upshear left(UL), and upshear right(UR)]during the final landfall of Typhoon Ewiniar(2018) is analyzed using two-dimensional video disdrometer and S-band polarimetric radar data collected in Guangdong, China. Due to the different types of underlying surfaces, the periods before landfall(mainly dominated by underlying sea surface) and after landfall(mainly dominated by underlying land surface) are also analyzed. Both before landfall and after landfall, the downshear quadrants had the dominate typhoon precipitation. The outer rainbands had more graupel than the inner core, resulting in a larger radar reflectivity, differential reflectivity, specific differential phase shift, and mass-weighted mean diameter below the melting layer. Compared with other regions, the eyewall region had the smallest mean logarithmic normalized intercept parameter before landfall and the smallest mean mass-weighted mean diameter and the largest mean logarithmic normalized intercept parameter after landfall. The hydrometeor size sorting was obvious in the eyewall and inner core(especially in the eyewall) after landfall. A high concentration of large raindrops fell in the DL quadrant, and more small raindrops fell in the UR quadrant. Although the icephase process and warm rain process were both important in the formation of tropical cyclone precipitation, the warm rain process(ice-phase process) contributed more liquid water before landfall(after landfall). This investigation provides a reference for improving the microphysical parameterization scheme in numerical models.

关 键 词：tropical cyclone precipitation microphysics raindrop size distribution southern China 

分 类 号：P444[天文地球—大气科学及气象学] P426.6