Five-year study of cloud-to-ground lightning activity in Yunnan province, China
Five-year study of cloud-to-ground lightning activity in Yunnan province, China
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中国云南省云地闪电活动五年研究
DOI：
10.1016/j.atmosres.2012.12.012
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发表时间：
2013-07
影响因子：
5.5
通讯作者：
Xuetao Liu
中科院分区：
文献类型：
--
作者：
Yiran Xie;Kai Xu;Tengfei Zhang;Xuetao Liu
利用云南雷电监测网（YNLDN）的观测资料，分析了云南云对地闪电的特征。这些数据覆盖了整个云南省，从2006年到2010年记录了超过209万次CG闪光。空间分析（总闪密度和正闪密度、正闪百分比、负峰值电流和正峰值电流）以20km的分辨率完成。平均空间分布在云南中部和金沙江一带，与地形和冷气团通道有关，最大闪数为3.8闪数km−2yr−1。月平均变化显示，CG闪电在5月至10月间最大（94%），在12月和1月最小。在红河流域观测到高值（0.15flasheskm−2yr−1）的正CG闪电密度。正闪的月分布主要在4月（19%），其次在7月和8月（17%），表明正闪的发生时间往往早于总闪。该省中部地区的年平均闪光率较低，为3%。阳性CG闪光的比例从8月份的2%上升到1月份的49%。负首冲程的中位峰值电流每月变化仅从27kA略有变化。首次冲程阳性的中位峰值电流的月变化在冬季最大，在5月份最小。负CG闪电的平均日周期在1600 - 1700 LT之间达到峰值（11.37%），在0900 - 1000 LT之间达到最低点（0.23%）。正闪的日变化在0100-0200 LT左右达到最大值，在1800 LT有次高峰。这种变化与当地中尺度环流有关，具有明显的夜间特征。
The characteristics of cloud-to-ground (CG) lightning in Yunnan province, based on the data recorded by the Yunnan Lightning Detection Network (YNLDN), are presented. The data, more than 2.09million CG flashes, cover the entirety of Yunnan province and were recorded from 2006 to 2010. The spatial analyses (total and positive flash density, the percentage of positive flashes, negative and positive peak currents) were done with a resolution of 20km. The average spatial distribution shows a maximum (3.8flasheskm−2yr−1) over the central Yunnan province and Jinsha river associated with topography and cold air mass passage. The mean monthly variation shows a maximum CG lightning between May and October (94%) and minimum values in December and January. High values (0.15flasheskm−2yr−1) for positive CG lightning density are observed in Red river basin. The monthly distribution of positive flashes shows a main maximum in April (19%) and a secondary maximum in July and August (17%), suggesting that positive flashes tend to occur earlier in the year than total flashes. The mean annual percentage of positive flashes has lower values at 3% in the central parts of the province. The percentage of positive CG flashes changes over the year from 2% in August to 49% in January. The monthly variation of median peak current for the negative first-stroke for each month varies only slightly from 27kA. The monthly variation of the median peak current for positive first-stroke, however, has a maximum in winter and the minimum occurs in May. The mean diurnal cycle for the negative CG lightning flashes peaks between 1600 and 1700 LT (11.37%) and shows a minimum between 0900 and 1000 LT (0.23%). The diurnal variation of positive flashes, in turn, shows a maximum around 0100–0200 LT, with a secondary peak at 1800 LT. This variation is associated with local mesoscale circulation, which has an obvious nocturnal feature.
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影响因子：
4.4
作者：
Shui Ming Chen;Y. Du;Ling Meng Fan
通讯作者：
Shui Ming Chen;Y. Du;Ling Meng Fan
影响因子：
2.1
作者：
Shui-ming Chen;Ya-ping Du;L. Fan;H. He;D. Zhong
通讯作者：
Shui-ming Chen;Ya-ping Du;L. Fan;H. He;D. Zhong
影响因子：
3.2
作者：
T. Yabe;R. Tanaka;T. Nakamura;F. Xiao
通讯作者：
T. Yabe;R. Tanaka;T. Nakamura;F. Xiao
影响因子：
--
作者：
R. Orville;R. Weisman;R. Pyle;R. Henderson
通讯作者：
R. Orville;R. Weisman;R. Pyle;R. Henderson
DOI：
--
发表时间：
1996
期刊：
Contributions to atmospheric physics
影响因子：
--
作者：
U. Finke;T. Hauf
通讯作者：
U. Finke;T. Hauf