The characteristics of lightning activity-dynamics-microphysical in a tropical hailstorm
Based on three-dimensional lightning locations system and S-band dual-polarimetric Doppler radar data,the characteristics of lightning activity-dynamics-microphysical of a hailstorm that occurred on Hainan Island on 24 June 2021 was analyzed in detail.The analysis revealed that the lightning activity of hailstorm was dominated by intracloud lightning,which accounted for 85.38％of the total lightning.The cloud-to-ground lightning(CG)that occurred before the hailstorm was dominated by positive cloud-to-ground lightning(+CG).Before 25 min of the hailfall,60％of the CG was+CG,which higher than normal thunderstorms.In the mature stage,the updraft intensified twice,at the meanwhile,the"lightning jump"lagged the updraft intensification.In addition,the increase and decrease of lightning frequency could be related to merger and separation of convection cell.Combined with the identification of precipitation particles within the cloud by the fuzzy logic method,the correlation coefficients between the total flashes and ice-phase hydrometeors were calculated,in which the graupel and ice-crystal particles more highly correlated with the total flashes,the correlation coefficients were 0.76 and 0.83,respectively.According to the spatial distribution characteristics of lightning radiation sources,it was inferred that the charge structure of hailstorm before the hailfall was anti-tripole charge structure.The positive charge area was located about between 7 to 9.5 km(about between-10 ℃ to-25℃).
HailstormThree-dimensional lightning locationDual-polarimetric doppler radarClassification of hydrometeors
万方数据
维普
