高原气象

高原气象 >

2013 , Vol. 32 >Issue 3: 673 - 681

DOI: https://doi.org/10.7522/j.issn.1000-0534.2013.00083

论文

青藏高原东北部地区闪电特征初步分析

  • 张荣- ,
  • 张广庶 ,
  • 王彦辉 ,
  • 李亚珺
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  • 中国科学院寒区旱区环境与工程研究所 寒旱区陆面过程与气候变化重点实验室, 甘肃 兰州730000;2. 中国科学院大学, 北京100049

网络出版日期: 2013-06-28

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Preliminary Analyses on Some Characteristics of Flashes in Northeastern Qinghai-Xizang Plateau

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Online published: 2013-06-28

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摘要

利用VHF辐射源三维定位系统及快、 慢天线资料， 对青海大通地区5次雷暴过程中云闪、 负地闪、 正地闪的起始高度、 持续时间、 辐射源数目及正、 负地闪云内放电过程的持续时间和回击次数进行了统计分析。研究表明， 该地区闪电持续时间较短， 平均<0.5 s； 正、 负地闪首次回击发生前均有较长时间的云内放电过程， 正地闪的云内放电过程持续时间略长于负地闪； 负地闪的回击次数较少， 平均为2.5次， 其中40%的负地闪只有1次回击， 而正地闪回击次数均为1次； 云闪的起始高度最高， 负地闪的起始高度低于云闪， 正地闪的起始高度最低； 云闪产生的辐射源数目最多， 负地闪少于云闪， 正地闪产生的辐射源数目最少。

关键词： 闪电; 起始高度; 辐射源

本文引用格式

张荣- , 张广庶 , 王彦辉 , 李亚珺 . 青藏高原东北部地区闪电特征初步分析[J]. 高原气象, 2013 , 32(3) : 673 -681 . DOI: 10.7522/j.issn.1000-0534.2013.00083

Abstract

Some characteristics of lightning flashes in northeastern Qinghai-Xizang Plateau were analyzed using the three-dimensional lightning locating system, fast  and slow antennas. It is found that the duration of  flashes is not long, averagely less than 0.5 s. Both the positive and negative cloud-to-ground flashes have long duration of intracloud discharge process before the first return stroke, and it is slightly longer for positive cloud-to-ground flashes. The average number of strokes per negative cloud-to-ground flash is 2.5, and 40% of the negative cloud-to-ground flashes are single-stroke flashes, while all the positive cloud-to-ground flashes are single-stroke flashes. The average starting height of intracloud flashes is higher than the negative cloud-to-ground flashes, and that of the positive cloud-to-ground flashes is lower than the negative cloud-to-ground flashes. Meanwhile, the average number of radiation sources generated by intracloud flashes is the largest, followed by negative cloud-to-ground flashes, and that of positive cloud-to-ground flashes is the smallest.

Key words： Lightning flash; Starting height; Radiation source

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