摘要
利用福建省中尺度灾害性天气预警系统（简称福建二级基地）的闪电定位站网、雷达和常规天气观测资料，对１９９７年５ 月５日至７ 日晨发生在闽东南沿海各县市一场特大暴雨天气过程的闪电特征及其与降雨的相互关系进行分析。结果表明：这次暴雨过程地闪和云闪总数超过５ ０００次，闪电密度极值超过１次／ｋｍ ２，地闪次数超过云闪次数，负地闪占绝对优势，正云闪占２／３以上。暴雨区的闪电频数－ 时间曲线很好地反映了暴雨过程降水高峰的到来和消亡的演变趋势。闪电密度中值区与暴雨落区吻合，闪电密度高值区与雷暴降雨贡献之暴雨中心一致。
Using the data from the Lightning Location Network,Doppler Radar and conventional Meteorological Observations of Fujian Province, The Lightning characteristics and Lightning/Rain relationships for the torrential rain weather of May 5 to 7,1997 in the south-east coastal area of the province are analysed. It is shown that thunderstorm is active frequently during the weather process, and the total amount of Lightning is over 5000 times,with the density maximum of Cloud-to-Ground Lightning(CGL) over 1 times/km 2 and the frequency maximum of CGL and Intra-Cloud Lightning(ICL) over 450 and 350 times/hour respectively.Whereas,the CGL frequency is larger than that of ICL, and the percentages of negative CGL and positive ICL are over 86% and 66% respectively, in the torrential rain region. The results also show that the torrential rain weather involves both types of the processes with Strong and Weak thunderstorm activities, there are very different characteristics of Lightning frequency and polarity for both processes. In addition, the curves of Lightning frequency versus time represent the tendency of precipitation during the torrential rain process, while the middle value area of the CGL density is overlaped with one of heavy rain and the high value area is coincided with the central part of the torrential rain produced by thunderstorm, but with the maximum point of CGL density deviated from the maximum center of the torrential rain, which needs to be researched further.
出处
《南京气象学院学报》
CSCD
1999年第2期155-163,共9页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金
国家气象局科教司研究项目资助
关键词
暴雨
地闪
云闪
雷电特征
个例分析
torrential rain
ground strokes
cloud flashes
correlation
