Observation and Analysis of the Electrical Characteristic and Precipitation Particle Distribution of a Thunderstorm Process in Yun-Gui Plateau Region

Using X band dual line polarization radar data, atmospheric electric field data and VLF/LF three-dimensional lightning localization data, the electrical characteristic of a thunderstorm process occurring in the platform of the Yunnan-Guizhou Plateau were analyzed in detail, and the precipitation particles in the cloud were inverted based on the fuzzy logic hydrometeor classification(FHC). The results show that: (1) The thunderstorm was tripole charge structure in the development and maturity stage, and there was a certain range of positive charge region at the bottom of thunderstorm cloud. The height of the positive cloud flash was between 1.66˜24.7 km, and the height of the negative cloud flash was between 1.0˜17.12km.The cloud flash mainly occured between the lower positive charge region and the middle negative charge region,.The vertical distribution of the thunderstorm charge structure can be understood by the height distribution of the cloud flash radiation source polarity. (2) In the development and maturity stage of thunderstorm, there were some differences in the number and distribution height of different particles in thunderstorm cloud. The evolution characteristic of graupel particles and ice crystals were consistent with the development and maturity stages of thunderstorm. Combined with atmospheric electric field and lightning location data, the evolution of graupel particle and ice crystal particle was closely related to the electrification of thunderstorm. (3) It can be observed from the vertical distribution characteristic of different particles that the strength of the positive charge region in the lower part of the thunderstorm cloud was most likely determined by the number of graupel particle. The graupel-ice charging mechanism can better interpret the formation of the tripole charge structure of thunderstorm. (4) The cloud flash source information detected by the VLF./LF three-dimensional lightning location system has a certain indication on the general distribution of the thunderstorm cloud charge region. It is necessary to dig deep into the cloud flash information in the future to provide support for the thunderstorm charge structure research