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Observation and analysis of electrical structure change and diversity in thunderstorms on the Qinghai-Tibet Plateau

刊物全称

Atmospheric Research

论文作者

Yajun Li,Guangshu Zhang,Yanhui Wang,Bin Wu,Jing Li

发表年度

2017

刊物类别

SCI

卷

194

期

130-141

影响因子

3.778

通讯作者

Li, YJ

请求全文

liyajun@lzb.ac.cn

关键词

Qinghai-Tibet Plateau, charge structure, Lightning flash frequency, Charge structure change and diversity

摘要

A comprehensive observation on thunderstorms was conducted in the Qinghai area by using a very high frequency three-dimensional lightning mapping system and Doppler radar. The spatio-temporal evolution of the charge structure of the isolated thunderstorm was analyzed according to the developing process of thunderstorm, and the reasons for the change in charge structure diversity were studied. During the initial developing and mature stages of the thunderstorm, the charge structure was a steady negative dipole polarity, i.e., the negative charge region was above the positive charge region. Furthermore, the total number of flashes was lower during these two stages. During the thunderstorm's dissipation stage, the charge structure was varied and complicated, with a positive dipole, negative dipole, and a tripole charge structure changing and coexisting during this stage. This charge structure diversity was primarily caused by the collision and merging of two local thunderstorm cells, leading to a charge rearrangement and distribution and the formation of a new charge structure. The frequency of the negative cloud-to-ground and intracloud flashes increased sharply in the dissipation stage, reaching a maximum value. The increase in frequency of negative cloud-to-ground was mainly caused by the lower positive charge weakening during the dissipation stage. In addition, the relationship between charging regions and temperature layers was analyzed by combining sounding temperature data with the theory of a non-inductive charging mechanism.

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