福建省前汛期暴雨天气雷电特征的个例分析
投稿时间:1998-07-06  修订日期:1998-11-25  点此下载全文
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作者单位
林炳干 福建省气象局, 福州 350001 
谢兴生 中国科技大学, 合肥 230026 
陶善昌 中国科技大学, 合肥 230026 
基金项目:国家自然科学基金;国家气象局科教司研究项目资助
中文摘要: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5000次,闪电密度极值超过1次/km2,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,但闪电密度极值位置偏离暴雨极值中心
中文关键词:暴雨  地闪  云闪  相关
 
CASE STUDY OF THE LIGHTNING CHARACTERISTICS FOR TORRENTIAL RAIN DURING THE EARLY FLOOD SEASON IN FUJIAN PROVINCE
Abstract: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/km2 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.
keywords:torrential rain  ground strokes  cloud flashes  correlation
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