J4 ›› 2004, Vol. 22 ›› Issue (2): 45-51.

• 论文 • 上一篇    下一篇

兰州周边地闪分布特征

李照荣1陈添宇2康凤琴2庞朝云1杨增梓1丁瑞津1安林3   

  1. 1.甘肃省人工影响天气办公室,甘肃 兰州 730020;2.兰州干旱气象研究所,甘肃 兰州 730020;
    3.兰州市气象局,甘肃 兰州 730020
  • 收稿日期:2004-04-30 修回日期:2004-05-31 出版日期:2004-06-30 发布日期:2004-06-30
  • 作者简介:李照荣(1972- ),男,甘肃白银人,工程师,从事人工影响天气工作.E-mail:gsryb@public.lz.gs.cn
  • 基金资助:

    本研究由科技部社会公益性研究课题“西北地区防雹消雹技术”(2002DIB10046)和“闪电定位仪应用研究”项目(2004人影-1)共同资助。

Lightning Distribution Characteristics around Lanzhou

LI Zhao-rong1,CHEN Tian-yu1,KANG Feng-qin2,PANG Chao-yun1,YANG Zeng-zi1
DING Rui-jin1AN Ling3   

  1. 1.Gansu Weather Modification Office,Lanzhou 730020,China;
    2.Institute o fArid Meteorology,CMA,Lanzhou 730020,China;
    3.Lanzhou Weasther Modificafion Office,Lanzhou 730020,China
  • Received:2004-04-30 Revised:2004-05-31 Online:2004-06-30 Published:2004-06-30

摘要:

利用2000年和2002年设在兰州的闪电定位仪资料,分析了兰州周边地区地闪的日频次变化、强度谱分布和累计百分数、日均月变化、闪电密度、极性等特征,并与山东地区的分布做了比较。结果表明,兰州周边地区的云—地闪电中负闪占绝大多数,正闪的平均强度大于负闪,正负闪的比值在午后至次日凌晨大于其均值;总地闪和负闪的日变化呈典型的双峰变化,正闪的双峰特征不明显;兰州西南偏南的渭源和陇西县是闪电频发的中心地带,闪电空间分布中心与冰雹发生源地和影响区对应一致;闪电多发区与地形和气候背景有很大关系。

关键词: 云—地闪电, 分布特征, 冰雹

Abstract:

By using the lightning data in 2000 and 2002 around Lanzhou,lightning characteristics such as daily variation,spatial density,intensity and polarity of lightning are analyzed and also compared with those in Shandong province.The results indicate that major cloud-to-ground(CG)flashes of lightning are negative.The mean intensity of positive flashes is stronger than that of negative flashes and their ratio is over average during 12:00 to 00:00.Daily variety of the CGand negative flashes is bimodalundulance,other than positive flashes unimodal.The biggest flashes frequency center locates in Weiyuan and Longxi county,and accord with the location of hail source are aand hail affecting zone. Furthermore,the spatial distribution of lightning is closely related to the topography and under lying surface and synoptic climatic background

Key words: cloud-to-ground lightning, distribution characteristics, hail

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