赣州一次强降水过程的闪电特征与多尺度资料分析

Lightning Characteristics and Multiscale Data Analysis of A Heavy Rainfall Process in Ganzhou

为探寻闪电活动与气象要素之间的关联性,结合三维闪电定位资料、雷达资料、风云四号卫星云顶温度资料,以及地面气象观测站资料,对2019年7月14日发生在赣州市的强降水天气过程进行多尺度分析。结果表明:强降水天气过程中以负地闪占优势,正地闪增多预示着过程的消散;降水分布跟闪电密度分布较为一致,闪电频次峰值领先于降水量峰值,负闪多出现在强回波移动方向的前方,对回波运动方向有指示作用;闪电活动结合云顶温度低值区的变化与地面降水强度的变化有较好的对应关系。

In order to explore the correlation between lightning activity and meteorological elements,combined 3D lightning location data,radar data,cloud top temperature data of FY-4 satellite and ground meteorological observation station data to conduct a multi-scale analysis of the heavy rainfall weather process that occurred in Ganzhou City on July 14,2019.The results indicated that negative ground flashes dominate during heavy rainfall weather processes,while an increase in positive ground flashes indicated the dissipation stage of the process;The precipitation distribution was more consistent with the lightning density distribution.The lightning frequency peak was ahead of the precipitation peak,and the negative flash mostly appears in front of the strong echo moving direction,indicating the echo moving direction;There was a good corresponding relationship between lightning activity and changes in the intensity of ground precipitation,combined with changes in low cloud top temperature areas.