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CHARACTERISTICS AND RELATIONS OF LIGHTNING AND RADAR ECHOES FOR STRONG CONVECTIVE RAINSTORMS IN YUNNAN
作者姓名:张腾飞  段旭  张杰  尹丽云  刘磊
作者单位:Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Institute, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China
基金项目:Technological and Planning Project of Yunnan Province (2009CA014); National Natural Science Foundation of China (41265001)
摘    要:Based on cloud-ground lightning data and Doppler weather radar echo products, both thecharacteristics and the relations of lightning and radar echoes for strong convective rainstorms over Yunnanare analyzed during the flood season of 2007. The results show that most rainstorms are convective in whichlightning is mostly negative and the negative lightning number accounts for more than 90% of the total.Although the correlation between precipitation and the lightning number is small on the rainstorm day, thelarge day-lightning frequency usually produces heavy precipitation. Hourly evolution of precipitation andlightning frequency shows peak-style characteristics. And their evolution is very coherent in strongrainstorm, but lightning often occurs before precipitation, whose peaks are in phase with or 1-to-2-hourlagged behind that of lightning frequency. Meanwhile the peaks of positive frequency are in phase with orfall behind that of precipitation. When the wind field is heterogeneous in radial velocity, it is conducive toboth the development of convection echoes and occurrence of lightning. Strong lightning-producingconvective rainstorms correspond to strong echo fields and usually result in reflectivity above 30 dBZ andecho top ET of more than 9 km, respectively.

关 键 词:strong  convective  rainstorm  lightning  characteristics  radar  echo  relation
收稿时间:3/8/2012 12:00:00 AM
修稿时间:2013/3/19 0:00:00

CHARACTERISTICS AND RELATIONS OF LIGHTNING AND RADAR ECHOES FOR STRONG CONVECTIVE RAINSTORMS IN YUNNAN
ZHANG Teng-fei,DUAN Xu,ZHANG Jie,YIN Li-yun and LIU Lei.CHARACTERISTICS AND RELATIONS OF LIGHTNING AND RADAR ECHOES FOR STRONG CONVECTIVE RAINSTORMS IN YUNNAN[J].Journal of Tropical Meteorology,2013,19(2):188-196.
Authors:ZHANG Teng-fei  DUAN Xu  ZHANG Jie  YIN Li-yun and LIU Lei
Affiliation:Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Institute, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China;Yunnan Meteorological Observatory, Kunming 6500034 China
Abstract:Based on cloud-ground lightning data and Doppler weather radar echo products, both the characteristics and the relations of lightning and radar echoes for strong convective rainstorms over Yunnan are analyzed during the flood season of 2007. The results show that most rainstorms are convective in which lightning is mostly negative and the negative lightning number accounts for more than 90% of the total. Although the correlation between precipitation and the lightning number is small on the rainstorm day, the large day-lightning frequency usually produces heavy precipitation. Hourly evolution of precipitation and lightning frequency shows peak-style characteristics. And their evolution is very coherent in strong rainstorm, but lightning often occurs before precipitation, whose peaks are in phase with or 1-to-2-hour lagged behind that of lightning frequency. Meanwhile the peaks of positive frequency are in phase with or fall behind that of precipitation. When the wind field is heterogeneous in radial velocity, it is conducive to both the development of convection echoes and occurrence of lightning. Strong lightning-producing convective rainstorms correspond to strong echo fields and usually result in reflectivity above 30 dBZ and echo top ET of more than 9 km, respectively.
Keywords:strong convective rainstorm  lightning characteristics  radar echo  relation
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