雷暴天气过程中地闪分布的诊断分析

Diagnosis of ground-to-cloud discharge distribution during thunderstorm

尝试将地闪的具体位置与一些气象参数的分布结合起来,分析了地闪位置与200 hPa高空急流、850 hPa水汽通量散度和总温度、通气管指数、K指数、风暴相对螺旋度分布的关系。发现除风暴相对螺旋度外,其它参数与地闪分布关系密切。进一步分析了一次雷暴个例,讨论了系统发展不同时期,地闪与各参数的分布特点。发现地闪集中区域向东南方向的迁移与一些参数大值中心的东南进或东移有很好的对应关系。这些结论对地闪闪区的预报和监测有非常好的指导意义。

It is tried to combine the concrete location of ground-to-cloud discharge with the distribution of some meteorological parameters. The relationship of location between ground-to-cloud discharge and upper-level jet stream at 200 hPa, divergence of moisture flux at 850 hPa, total temperature of 850 hPa, index of vent pipe, index K, storm relative helicity（SRH） has been analyzed. Besides SRH, there＇s close relationship between them. Furthermore, the course of one thunderstorm as an example has been used to discuss the more concrete distribution characteristics during different developing period. It has been found that there＇s nice correlation relationship between the big value centre of some index moving to southeast or east and the dense area of ground-to-cloud discharge moving to southeast. It＇s meaningful for forecasting and monitoring the location of ground-to-cloud discharge.