The lower positive charge center and its effect on lightning discharges on the Tibetan Plateau
The lower positive charge center and its effect on lightning discharges on the Tibetan Plateau
复制标题
青藏高原低正电荷中心及其对雷击放电的影响
DOI：
10.1029/2004gl022162
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发表时间：
2005-03-12
影响因子：
5.2
通讯作者：
Wei, WZ
中科院分区：
文献类型：
--
作者：
Qie, XS;Zhang, TL;Wei, WZ
本文研究了青藏高原中部海拔4508m雷暴的电学特征。一次典型雷暴下地面电场的演变和闪电产生的电场变化揭示了一种三极电荷结构，其正电荷中心(LPCC)比正常情况下大。风暴似乎是从正常三极结构中较低的偶极开始，而不是从较高的偶极开始，然后形成较弱的较低正电荷。闪光速率很低，平均值通常为1 fl/min。IC闪光通常是极性反转的，发生在下偶极子。大的LPCC在整个风暴过程中并没有引起正的CG闪光，在风暴后期只观察到了负的CG闪光。
Electrical characteristics of thunderstorms on the central Tibetan Plateau at an altitude of 4508 m have been studied. The evolution of surface electric (E) field and the E field changes produced by lightning flashes under a representative thunderstorm revealed a tripole charge structure with a larger‐than‐usual lower positive charge center (LPCC). The storms appear to begin with the lower dipole of a normal tripole structure, rather than with the upper dipole followed by the development of a weaker lower positive charge. The flash rate is quite low and the average value is usually 1 fl/min. The IC flashes were usually polarity‐inverted and occurred in the lower dipole. The large LPCC did not cause positive CG flashes to occur during the whole storm lifetime, and only negative CG flashes were observed in the late stage of the storm.