北京一次大雹天气过程的闪电活动特征分析

doi:10.3969/j.issn.1673-503X.2019.03.002

Abstract

Abstract: Due to the limitations of the lightning monitoring system,the existing studies were mostly limited to the cloud-to-ground lightning (CG) activity characteristics in the severe convective weather.In this paper,the data from the VLF/LF three-dimensional lightning monitoring and positioning system and radar observation stations were used to analyze the full lightning activity characteristics during a typical large hail weather process in Beijing.The results show that before the hail,the lightning activity is mainly distributed in the rear of the convection system,and the number of lightning is small,and the negative lightning activity is dominant.During the hail period,the frequency of lightning flashes (FLF) increases significantly,and the intracloud lightning (IC) and positive CG activities are significantly enhanced.The lightning activities in this stage are mainly concentrated at the center of the strong echo area and the regions with a large gradient of the front radar reflectivity factor of the convection system.After the hail,the strong echo center moves out of Beijing,and the FLF in Beijing decreases significantly.The proportion of positive lightning increases gradually before the occurrence of hail remains stable at a large value during the period of hail,and decreases rapidly after the end of hail.The IC lightning ratio (the frequency of IC lightning/the frequency of total lightning) shows a gradually increasing trend before and after the hail,and basically remains stable and changes little during the hail.The lightning current strength is mainly concentrated in the 5-50 kA.The IC and CG with current intensity below 20 kA mostly occur during and after the hail,and those above 20 kA are dominant before the hail.The proportion of IC with a current intensity of less than 5 kA is higher than that of CG during the hail.Before and after the hail,the IC occurs at an altitude of 2-6 km,and increases during the hail,to about 2-8 km.The peak of FLF is 5-20 min ahead of that of precipitation.

Key words: Characteristics of 3D lightning activity, Hail, Intracloud lightning(IC), Cloud-to-ground lightning(CG), Frequency of lightning flashes

CLC Number:

P458.1⁺21.2

GUO Run-xia, ZHANG Wen-long. Analysis of lightning flash activity characteristics of a severe hailstorm process in Beijing[J]. Journal of Meteorology and Environment, 2019, 35(3): 10-17.

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Analysis of lightning flash activity characteristics of a severe hailstorm process in Beijing

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