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Characteristics of the two active stages of lightning activity in two hailstorms
Alternative TitleCharacteristics of the Two Active Stages of Lightning Activity in Two Hailstorms
Xu Shuang1; Zheng Dong3; Wang Yongqing1; Hu Pengyu2
2016
Source PublicationJOURNAL OF METEOROLOGICAL RESEARCH
ISSN2095-6037
Volume30Issue:2Pages:265-281
AbstractTwo hailstorms that occurred in Beijing and Tianjin, respectively, are investigated, based mainly on the total lightning data observed by the System d'Alerte Fondre par Interferometric Radioelecctrique (SAFIR3000), the cloud-to-ground (CG) lightning data of a CG lightning location system, and the echo data of a Doppler radar. Both hailstorms exhibited two lightning frequency peaks: the first was before the hailfall and the second was after the hailfall, with the second peak greater than the first. The dominant polarity of the CG lightning was positive in the stage around the first frequency peak, but changed to negative in the stage around the second frequency peak. The evolution of radar echoes and the height distribution of lightning radiation sources are explored, revealing that both hailstorms had stronger convection and the main positive charge occurred at mid levels during the stage around the first frequency peak. However, whilst the Beijing hailstorm experienced the enhancement of convection, with the main positive charge at upper levels around the second frequency peak, the Tianjin hailstorm generated its second frequency peak during the period when the convection kept weakening and the main positive charge dropped to mid-lower levels. Through evaluation of the radar parameters, we investigate the mechanisms responsible for the second stage of active lightning discharge. Furthermore, the lightning activity exhibited a close relationship with radar echo parameters and hailfall. Lightning jump signals were found before the hailfall and were associated with the change ratio of the 40-dBZ echo volume above the -15A degrees C level, which demonstrates the application value of lightning data in severe weather warning.
Other AbstractTwo hailstorms that occurred in Beijing and Tianjin, respectively, are investigated, based mainly on the total lightning data observed by the System d’Alerte Fondre par Interferometric Radioelecctrique (SAFIR3000), the cloud-to-ground (CG) lightning data of a CG lightning location system, and the echo data of a Doppler radar. Both hailstorms exhibited two lightning frequency peaks: the first was before the hailfall and the second was after the hailfall, with the second peak greater than the first. The dominant polarity of the CG lightning was positive in the stage around the first frequency peak, but changed to negative in the stage around the second frequency peak. The evolution of radar echoes and the height distribution of lightning radiation sources are explored, revealing that both hailstorms had stronger convection and the main positive charge occurred at mid levels during the stage around the first frequency peak. However, whilst the Beijing hailstorm experienced the enhancement of convection, with the main positive charge at upper levels around the second frequency peak, the Tianjin hailstorm generated its second frequency peak during the period when the convection kept weakening and the main positive charge dropped to mid–lower levels. Through evaluation of the radar parameters, we investigate the mechanisms responsible for the second stage of active lightning discharge. Furthermore, the lightning activity exhibited a close relationship with radar echo parameters and hailfall. Lightning jump signals were found before the hailfall and were associated with the change ratio of the 40-dBZ echo volume above the –15℃ level, which demonstrates the application value of lightning data in severe weather warning.
KeywordTHUNDERSTORMS PRECIPITATION CHARGE STORM ELECTRIFICATION PROPAGATION EVOLUTION SYSTEM RADAR STEPS hailstorm total lightning electric structure
Indexed ByCSCD
Language英语
Funding Project[National (Key) Basic Research and Development (973) Program of China] ; [Basic Research Project of the Chinese Academy of Meteorological Sciences] ; [Key Laboratory Open Project of Disasters Research] ; [Natural Science Research for Jiangsu Provincial Higher Education Colleges]
CSCD IDCSCD:5701161
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/147000
Collection中国科学院金属研究所
Affiliation1.南京大学
2.中国科学院金属研究所
3.Chinese Acad Meteorol Science, State Key Lab Severe Weather, Beijing 100081, Peoples R China State Key Lab Severe Weather
Recommended Citation
GB/T 7714
Xu Shuang,Zheng Dong,Wang Yongqing,et al. Characteristics of the two active stages of lightning activity in two hailstorms[J]. JOURNAL OF METEOROLOGICAL RESEARCH,2016,30(2):265-281.
APA Xu Shuang,Zheng Dong,Wang Yongqing,&Hu Pengyu.(2016).Characteristics of the two active stages of lightning activity in two hailstorms.JOURNAL OF METEOROLOGICAL RESEARCH,30(2),265-281.
MLA Xu Shuang,et al."Characteristics of the two active stages of lightning activity in two hailstorms".JOURNAL OF METEOROLOGICAL RESEARCH 30.2(2016):265-281.
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