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Characterising the dynamic movement of thunderstorms using very low- and low-frequency (VLF/LF) total lightning data over the Pearl River Delta region
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2022-08-05 , DOI: 10.5194/acp-22-10045-2022 Si Cheng , Jianguo Wang , Li Cai , Mi Zhou , Rui Su , Yijun Huang , Quanxin Li
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2022-08-05 , DOI: 10.5194/acp-22-10045-2022 Si Cheng , Jianguo Wang , Li Cai , Mi Zhou , Rui Su , Yijun Huang , Quanxin Li
This paper reveals the dynamic movement characteristics
of thunderstorms using total lightning data obtained from very low- and low-frequency (VLF/LF)
location measurements. Eight thunderstorms, which were evenly distributed in
the morning, midday, afternoon and evening, are selected to compare the
different kinematic features over the Pearl River Delta (PRD) region in the
south of China from 17 to 23 May 2014. The connected-neighbourhood
labelling method is used to identify lightning clusters and obtain the
centroids. Significant characterisation parameters are put forward as
metrics to reveal the kinematic features of thunderstorms, including the
duration time, valid area (VA), movement velocity, movement direction and
farthest distance in longitude and latitude during the life cycle of the
storm. A common trend is that the storms initiate in the west of the PRD
region, moving to the east and disappearing after the thunderstorm travels
around 106.5 km in longitude. There are two kinds of distributions to depict
the property of the valid area, which are one-peak distribution with the
maximum in the mature stage and two-peak distribution with a relatively
smaller peak in the early time of the storm. The velocity does not show the
same trend as the variation in VA which shows a steady increase or decrease
during the lifetime of thunderstorms. The biggest VA and highest velocity
are 891 km2 occurring on the evening of 17 May and 204.8 km h−1
occurring on the morning of 20 May. The 19 May evening storm was the weakest,
with the maximum VA and velocity being 253 km2 and 115.3 km h−1,
respectively. The motion of eight storms shows a distinct pattern as the
spread of direction distributes tightly in the range of 0–180∘. The movement characteristics of thunderstorms and the
associated parameters may help to improve the nowcasting and forecasting
system of thunderstorms in the warm season.
更新日期:2022-08-05