Charge structures and cloud-to-ground lightning discharges characteristics in two supercell thunderstorms
Charge structures and cloud-to-ground lightning discharges characteristics in two supercell thunderstorms
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DOI：
10.1007/s11434-005-0233-7
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发表时间：
2006-01
影响因子：
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通讯作者：
Yijun Zhang;Q. Meng;Wei-Tao Lu;Krehbiel Paul;Xin-sheng Liu;Xiuji Zhou
中科院分区：
文献类型：
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作者：
Yijun Zhang;Q. Meng;Wei-Tao Lu;Krehbiel Paul;Xin-sheng Liu;Xiuji Zhou
利用具有高时空分辨率的三维VHF辐射源资料，分析了两次超级单体雷暴云地闪电放电的电荷结构和时空特征。结果表明，雷暴的主要部分（对流区）电荷结构均为倒三极结构，而两次雷暴中均出现了大量的正地闪放电。雷暴的主要部分发生正地闪放电，起源于雷暴中部的正电荷区。当雷暴发生大量负地闪放电时，负地闪放电发生在雷暴砧上。由于主区的电荷结构向砧区倾斜，导致主区的电荷结构为倒偶极。位于砧座上部的负电荷区产生了大量的负地闪放电。位于雷暴下部的电荷区不直接产生或产生较少的CG照明。雷暴云下部的电荷区对其上方电荷区产生地闪起着重要作用。
The charge structures and temporal and spatial characteristics of cloud-to-ground (CG) lightning discharges in two supercell thunderstorms have been analyzed based on the data of three-dimensional VHF radiation sources with high time and space resolution produced by lightning discharges. The results indicate that the charge structures in main part (convective region) of the thunderstorms were inverted tripole while a number of positive CG lightning discharges were occurring in the two thunderstorms. The positive CG lightning discharges occurred in main part of the thunderstorms and originated from the positive charge region located at the middle part of the thunderstorms. While a number of negative CG lightning discharges were occurring, the negative CG lightning discharges occurred in the anvil of the thunderstorm. The charge structure is inverted dipole in the region due to the slant of charge structure in main region toward anvil region. The negative charge region located at the upper part of anvil produced a lot of negative CG lightning discharges. No or less CG lighting was produced directly by the charge region located at the lower part of the thunderstorm. The charge region in lower part of the thunderstorm plays an important role for the occurrence of CG lightning from charge region above it.