Study on Three-dimensional Lightning Activity Characteristics of Severe Convection Weather in Jiangxi Province
Xia Xue
Li Jia
Deng Hongxia
Wang Rongzhu
Abstract：Based on the ADTD-2C three-dimensional lightning location and monitoring data of Jian-gxi Province from 2019 to 2021,the occurrence and development characteristics of lightning during short-time severe precipitation,thunderstorm gale and hail processes are analyzed comparatively from five per-spectives of time,space,lightning current polarity,lightning current amplitude and lightning density.The study results show that three-dimensional lightning associated with severe convections mainly occurred from March to September,and the maximum lightning frequency often appears in May.The daily high shocks tend to occur from 13:00 to 22:00 with peaks at 17:00.The monthly and daily distribution char-acteristics of lightning during short-time severe precipitation are generally consistent with the characteris-tics of three-dimensional lightning associated with severe convections.The concentrated periods of light-ning activities during thunderstorm gale and hail processes are from May to August and from March to May,respectively.Lightning with thunderstorm gale mainly occurs in the afternoon and evening,and lightning with hail mainly from evening to early morning.Three-dimensional lightning of severe convec-tions is mainly distributed in Ji′an,Yichun,Ganzhou and Fuzhou.Lightning of short-time severe precipi-tation is mainly distributed in Yichun,and that of thunderstorm gale mainly occurs in Ganzhou.The pro-portion of positive cloud-to-ground lightning in the total number from 2019 to 2021 is 3.94 times that of the 15-year record from 2005 to 2019.The proportion of positive cloud flash in the total number is even larger,among which the proportion of positive cloud flash of thunderstorm gale is the highest.The ex-treme range of lightning current amplitude with short-time severe precipitation and thunderstorm gale is(0 kA,10 kA],and the extreme range of lightning during hail processes is(10 kA,20 kA].Three-di-mensional lightning of severe convections is mainly concentrated below 10 km,and there is more lightning during thunderstorm gale over the height of 10 km,but rare lightning with hail.The high-density areas at 850 hPa,700 hPa and 500 hPa correspond well with the high-density areas of the cloud-to-ground flash.The area of a lightning density greater than 0.6 times/(km2·year)decreases from ground to the height of 500 hPa.The distribution characteristics of lightning current amplitude and density show that the oc-currence and development height of lightning associated with thunderstorm gale is even higher,and the current intensity is even greater.In summary,this characteristic analysis of three-dimensional lightning activities during severe convections can provide an important reference for exploring the selection of light-ning indicators in forecasting and early warning of severe convective weather,and also provide a solid da-ta support for forecasting and early warning of lightning.
Keywords：three-dimensional lightningsevere convectionlightning densitylightning current amplitudeJiangxi Province
Publication Date：2025-01-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 88-95 )