基于ADTD資料的浙江地區多回擊地閃特征分析
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浙江省氣象局一般項目(2019YB09)資助


Characteristic Analysis of Multi-return Strokes of Cloud-to-Ground Lightning in Zhejiang Based on ADTD Data
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    摘要:

    利用2007—2018年浙江省ADTD閃電定位資料,分析了該地區多回擊地閃分布及相關參數特征。結果表明:浙江省多回擊地閃占總地閃的26.74%,其中正閃以單回擊地閃為主;正、負閃平均回擊數分別為1.04次和1.65次,最大回擊數分別為5次和21次。回擊數和地閃數存在較為一致的年際變化,正、負多回擊地閃日變化分別呈多峰和單峰分布。正、負多回擊地閃電流強度算術平均值分別為72.06 kA和-36.89 kA,回擊平均強度隨回擊數的增加而下降,約40%的地閃過程中至少有1次繼后回擊強度比首次回擊強;首次回擊和繼后回擊的強度分布呈對數正態分布,集中在15~45 kA之間。正、負地閃回擊間隔時間算術平均值分別為125.47 ms和138.14 ms,幾何平均值分別為56.73 ms和98.95 ms,回擊間隔時間呈對數正態分布,平均回擊間隔時間隨回擊數的增大而減小。多回擊地閃繼后回擊與首次回擊之間距離與回擊數呈準正態分布,集中在距離為1 km范圍內。

    Abstract:

    Based on the lightning location data of ADTD in Zhejiang Province from 2007 to 2018, the distribution and related parameters of multiple return strokes of cloudtoground (CG) lightning are analyzed. The results show that the number of multiple return stroke flashes accounts for 26.79% of the total CG number. The positive flashes are dominated by singlereturn stroke CG lightning flashes. The mean stroke number of positive CG and negative CG is 1.04 and 1.65, and the maximum stroke number is 5 and 21, respectively. The interannul variation features of multiple stroke CG lightning flashes and total CG lightning flashes are consistent. The daily changes of positive CG and negative CG show multimodal and unimodal distributions, respectively. The arithmetic mean current intensity of the positive multiple stroke lightning is 72.06 kA, and that of the negative is -36.89 kA. The average current for CG flashes of particular multiplicity has a tendency of decreasing with the stroke order. Furthermore, about 40% of multiple stroke CG flashes have at least one subsequent stroke, with the initial peak electric field stronger than that of the first return stroke. The current intensities of the first return stroke and flowing stroke of CG show a lognormal distribution, in which the stroke frequency is the highest when the current intensity is from 15 kA to 45 kA. The arithmetic mean interval stroke of positive CG lightning is 125.47 ms, and the negative is 138.14 ms. The geometric mean interval stroke of positive CG lightning is 56.73 ms, and the negative is 98.95 ms. The interval of stroke lightning also shows a lognormal distribution. The mean interval has a tendency of decreasing with the stroke order. The distribution of interval distance between first return stroke and flowing stroke shows a quasinormal distribution, and the strokes mostly occur within the range of 1 km.

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崔雪東,張衛斌,顧媛,田德寶.基于ADTD資料的浙江地區多回擊地閃特征分析[J].氣象科技,2021,49(3):491~497

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  • 收稿日期:2020-05-28
  • 定稿日期:2020-12-29
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  • 在線發布日期: 2021-06-23
  • 出版日期: 2021-06-30
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