强对流天气雷达回波与闪电特征的个例分析  

A case study on characteristics of lightning and Doppler radar echo in a strong convective system

作　　者：杨超[1] 肖稳安[1] 冯民学[2] 焦圣明 焦雪[2] 

机构地区：[1]南京信息工程大学,南京210044 [2]江苏省防雷中心,南京210008 [3]江苏省气象科学科研所,南京210008

出　　处：《气象科学》2009年第3期403-407,共5页Journal of the Meteorological Sciences

基　　金：江苏省社会发展项目(BS2005070)

摘　　要：利用闪电定位资料和多普勒天气雷达强度产品,分析了2006年6月22日发生在南京西南140km处的一次强对流天气过程中闪电的演变特征及其与回波强度的关系。结果表明,地闪多发生于雷暴云中回波强度大于40dBz且回波强度梯度较大的区域;正、负地闪频次在强对流系统发展的不同阶段呈现出不同的特点,负地闪占总闪数的90%以上,正地闪出现在系统进入成熟阶段之后,且占总闪的比例在系统消散阶段明显增大;地闪强度越大,相应的地闪频次越小,除少数弱闪(|I|<10kA)外,二者基本上呈反相位关系。Based on the synthetical analysis of lightning data and Doppler radar echoes from a strong convective system in Nanjing on 22 June 2006, relationship is found between lightning frequency and radar echo intensity. The Cloud-to-Ground （CG） flashes mainly occur in the echo intensity 〉 40 dBz and high echo gradient region. In the different phases of the strong convective system development, the frequency of positive and negative CG flashes are various. Positive CG flashes occurred after convective system reached the mature stage. Positive CG lightning ratio increased remarkably. The greater lightning intensity is, the smaller flash frequency is. Apart from a few weak flash （ 1I1 〈 10kA）, their relationship basically is inverse phase.

关 键 词：正、负地闪 地闪频次 回波强度 

分 类 号：P415.2[天文地球—大气科学及气象学]