北京强雷暴的地闪活动与雷达回波和降水的关系
投稿时间: 2005-01-30  最后修改时间: 2005-05-10  点此下载全文
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作者单位
李建华 南京信息工程大学, 电子工程系, 江苏, 南京, 210044;威海市气象局, 山东, 威海, 264200 
郭学良 中国科学院, 大气物理研究所, 北京, 100029 
肖稳安 南京信息工程大学, 电子工程系, 江苏, 南京, 210044 
基金项目:江苏省气象灾害重点实验室项目(KLME050101);国家自然科学基金资助项目(40175001);人工增雨的机理与方法研究(40333033);中国科学院重要方向性项目(KZCX3-SW-213);国家“十五”攻关项目(2001BA610A06)
中文摘要:对2000-2001年发生在北京地区的8次天气过程进行了闪电与降水特征的统计分析,并针对两类典型暴雨和冰雹天气进行了详细的雷达、闪电特征分析。结果表明:降雨和降雹天气的地闪特性具有明显差异。降雹天气的正闪比例较大,特别在降雹前正闪频数增加剧烈。闪电通常发生在45dBZ以上的回波区,比目前“闪电在中纬度通常发生在3045dBZ”等其他一些研究结果偏高。
中文关键词:地闪  强对流天气  雷达回波
 
Relationship of Cloud-Ground Lightning Activities with Radar Echo and Precipitation in Storms of Beijing
Abstract:The observational characteristics of cloud-ground lightnings and precipitation for 8 storms during 2000-2001 are investigated,and radar echo,and lightning feathures for two types of heavy-rain and hail-producing weather are analyzed detailedly.There are apparent differences of lightning features between heavy-rain and hail-producing weather.The hail-producing weather has more positive lightnings,and especially at the time just before hailfall the positive lightning frequency increases rapidly.In addition,it is also found that lightnings often occurred within radar echoes of more than 45 dBZ in the studied cases,which is a little higher than the 30-45 dBZ in mid-latitude region suggested by previous studies.
keywords:cloud-to-ground lightning  convective weather  radar echo
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