Characteristics of cloud-to-ground lightning in Chinese inland plateau
Characteristics of cloud-to-ground lightning in Chinese inland plateau
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DOI：
10.2151/jmsj.80.745
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发表时间：
2002-08
影响因子：
3.1
通讯作者：
X. Qie;Ye Yu;Daohong Wang;Huibin Wang;R. Chu
中科院分区：
文献类型：
--
作者：
X. Qie;Ye Yu;Daohong Wang;Huibin Wang;R. Chu
利用1996年1微秒宽频带慢天线系统和1997 ~ 1998年中国内陆高原地闪定位网的观测资料，分析了中国内陆高原地闪的特征。与典型的夏季雷暴相比，高原夏季雷暴的闪电放电往往具有一些特殊的特征。在中国内陆高原，正地闪平均占总地闪的16%。通过与雷达回波的比较，发现某些弱雷暴有利于正地闪的产生。第一次回击之前通常是一个长时间的初步击穿过程，其特征是正负CG闪光的离散双极脉冲。第一次回击前电场变化的平均持续时间约为126.1ms，其中负地闪超过200 ms的占23%，正地闪超过200 ms的占165.1ms。152个连续分析的脉冲之间的平均时间间隔为211.0±148.0 ms，负CG闪光的脉冲的总持续时间为32.0±20.0 ms，而50个分析的脉冲之间的平均时间间隔为165.0±120.0 ms，正CG闪光的脉冲的总持续时间为27.0±19.0 ms。其他放电特征，如冲程间隔、后续回击的幅度分布等，并进行了分析。
Characteristics of cloud-to-ground (CG) lightning flashes in the Chinese inland plateau have been analyzed by using the data obtained from a broadband slow antenna system, with a time resolution of 1 microsecond in 1996, and a CG lightning location network from 1997 to 1998. It has been found that lightning discharges in a plateau summer thunderstorm usually present some special characteristics compared with the typical summer thunderstorm. On the average, positive CG flashes comprised 16% of total CG flashes in the Chinese inland plateau. After comparison with radar echo, it is found that some weak thunderstorms are conducive to positive CG flashes. The first return strokes are usually preceded by a long duration preliminary breakdown process which is characterized by discrete bipolar pulses for both positive and negative CG flashes. The mean duration of electric field change prior to first return stroke is about 126.1 ms, in which 23% exceeds 200 ms for negative CG flashes, and the corresponding value is 165.1 ms for positive CG flashes. The mean interval between 152 successive analyzed pulses is 211.0±148.0 ms, and the total duration of the pulses is 32.0±20.0 ms for negative CG flashes, while the mean time interval between the 50 analyzed pulses is 165.0±120.0 ms and the total duration of pulses is 27.0±19.0 ms for positive CG flashes. Other discharge features, such as interstroke intervals, amplitude distribution of the subsequent return strokes and etc., are also analyzed in the paper.