南京地区夏季雷暴的雷达雷电特征分析

The summer thunderstorms's characteristics of the radar and lightning in Nanjing

通过对2009年发生在南京的6次雷暴过程的雷达回波强度、VWP产品、垂直速度等雷达产品和探空资料等常规气象产品以及闪电资料的对比分析,发现VWP产品对雷暴过程中大气的湿度条件有较好的指示作用,ND区的初始破坏时间往往早于雷暴中闪电的发生时间。闪电主要发生在雷达最大回波顶高度突破9 km之后,并且最大回波顶高度较闪电峰值有约12 min的提前量。雷达平均垂直速度图中出现强上升中心后的短时间内闪电将会突然增大。

Through contrastive analysis of the radar products,such as radar echo intensity,VWP product,average vertical velocity and so on,with the conventional meteorology products,such as meteorological sounding data etc as well as lightning data in Nanjing＇s six thunderstorm process in 2009,we found that the VWP product has a good instruction for the atmospheric humidity condition in the thunderstorm process,the initial destruction of ND area is often earlier than the lightning occurrence in the thunderstorm.The lightning mainly occurs after the radar maximum echo top breaks through 9km,in addition,in comparison with the lightning peak value,the maximum echo top is 12 minutes ahead of time.In the radar vertical velocity chart the lightning will increase suddenly after presence of strong ascending center in a short time.