成都地區地閃時空特征分析
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P458.121

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四川省氣象局重大項目(川氣重2004-04)資助


Temporal-Spatial Characteristics of Cloud-to-Ground Lightning around Chengdu
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    摘要:

    利用XDD03A型閃電定位儀所取得的3年資料,初步研究了成都周邊地區地閃特征。地閃中正地閃占絕大多數,其平均強度為6045A,略高于負地閃的5974A。地閃強度基本集中在12000A以下。地閃活動具有明顯的日變化,總體呈單峰單谷形式,地閃頻次在60以上的峰值時段是18:00-24:00和01:00,頻次在10以下的谷值時段是10:00~13:00,夜間閃電活動明顯大于日間。正地閃頻次日變化趨勢和總地閃相同,負地閃頻次日變化趨勢除一些小波動外,和正地閃、總地閃相同。正負地閃頻次的月變化趨勢相同,6、7、8月閃電數較多,4、5、9、10月閃電數較少。通過統計分析,發現各月地閃頻次和對應的各月降水量有較好的相關性。成都周邊地區地閃活動密集,6、7、8月的地閃密度大大超過4、5、9、10月。

    Abstract:

    The characteristics of cloud-to-ground(CG) lightning flashes around Chengdu is analyzed by means of three-year observational data from the XDD03A lightning location system.It is found that the majority of CG lightning flashes are positive with a mean intensity of 6045 A,slightly higher than that of negative flashes.The intensity of CG flashes is mostly below 12000 A.The daily variation of CG lightning flashes assumes a form of unimodal undulance,with the peak over 60 times from 18:00 to 21:00 and at 01:00 and the valley below 10 times from 10:00 to 13:00.Lightning flashes occur more frequently at night than in the daytime.The tendency of the daily variation of the positive CG lightning flashes is similar to that of total CG lightning flashes and so is that of the negative CG lightning flashes except some slight fluctuations.The tendency of the monthly variation of the number of the positive CG lightning flashes is similar to that of negative CG lightning flashes.Lightning flashes occur more frequently in June,July and August,while less frequently in April,May,September and October.Good correlation between monthly rainfall and corresponding monthly total CG flashes is found.The lightning density around Chengdu is relatively great,much higher in June,July,and August than in April,May,September,and October.

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王維佳 劉建西 孫林生.成都地區地閃時空特征分析[J].氣象科技,2006,34(6):667~673

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  • 收稿日期:2006-05-08
  • 定稿日期:2006-07-24
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