摘要
利用闪电定位系统、多普勒天气雷达、探空和降雨量资料,对南通地区2009年两次雷暴过程的地闪、降雨量和雷达特征进行了详细分析。结果表明:闪电主要集中在较强回波区域,40dBz及以上回波区域地闪尤为密集,但也有部分地闪尤其是正闪,发生在强回波边缘或回波弱的地方;40dBz回波高度突破-10℃温度层结高度的时间提前于第1次地闪,与地闪频数的变化一致性高;雷暴云发展过程中40dBz及以上雷达回波面积和地闪频数跳变较为一致,但出现连续降水时回波面积虽大,地闪频数反而减少;逐时降雨量和观测站周围20km范围内的地闪频数与时均40dBz及以上回波面积的相关性非常好。
Lightning,rainfall,and radar features of two thunderstorms in Nantong in 2009 are analyzed in detail with the data from the lightning location system,Doppler radar,radiosondes and rainfall data.Results show that lightning strokes mainly concentrated within the strong radar echo area,especially in the area of over 40 dBz radar echo,while some,in particular positive lightning,occurred on the edge of strong area or the weak area.The echo height of 40dBz echo reached the-10 ℃ level before the first lightning,being consistent with the variation of lightning frequency.The area of radar echo more than 40 dBz varied with the frequency of lightning strokes almost simultaneously,and the lightning frequency decreased during the rainfall though the echo area was big.There was good correlation among the frequency of lightning strokes happened around 20 km and the hourly average area of radar echo more than 40dBz.
出处
《气象科技》
2012年第4期620-626,共7页
Meteorological Science and Technology
基金
江苏省科技支撑计划(社会发展)项目(BE2009693)资助
关键词
回波面积
回波高度
地闪频数
逐时降雨量
radar echo area
echo height
lightning frequency
precipitation
