| 大兴安岭林区地闪放电特征的观测与分析 |
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| 引用本文： | 王东方,宣越健,刘继明,等.大兴安岭林区地闪放电特征的观测与分析[J].大气科学,2011,35(1):147-156. |
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| 作者姓名： | 王东方 宣越健 刘继明 等 |
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| 作者单位： | 1.中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京,100029 |
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| 基金项目： | 林业公益性行业科研专项经费课题（200704027-1），国家自然科学基金资助项目40930949, 中国科学院“百人计划” 专项经费 |
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| 摘 要： | 利用2009年夏季在大兴安岭林区开展的雷暴及闪电的多站GPS同步观测资料,详细分析了该地区的地闪放电特征.通过对464次地闪资料的分析,发现具有单次回击的地闪所占的比例高达69,且正地闪比例较高,达到了22%.对连续电流的统计表明,约有27%的地闪伴随有连续电流过程且长连续电流过程主要出现在具有单次回击的负地闪中,其平...
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| 关 键 词： | 大兴安岭林区 雷暴 地闪 连续电流 |
Analyses on the Characteristic of Cloud-to-Ground Lightning Flash in Da Hinggan Ling Forest Region |
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| Wang Dongfang,Xuan Yuejian,Liu Jiming and et al.Analyses on the Characteristic of Cloud-to-Ground Lightning Flash in Da Hinggan Ling Forest Region[J].Chinese Journal of Atmospheric Sciences,2011,35(1):147-156. |
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| Authors: | Wang Dongfang Xuan Yuejian Liu Jiming and |
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| Institution: | 1.Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,1000292.Department of Forestry, Forest Management Group of Da Hinggan Ling, Da Hinggan Ling 165000 |
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| Abstract: | By using multi-station observations on thunderstorm in Da Hinggan Ling forest region which was conducted in the summer of 2009, the characteristics of cloud-to-ground (CG) lightning discharges were analyzed. The results show that 69% of 464 CG lightning flashes were single-stroke CG lightning flashes and the percent of positive CG lightning flashes was up to 22%. Statistics show that 27% of CG lightning flashes were followed by continuing current and single-stroke CG lightning flashes were usually followed by long continuing current. The mean duration of long continuing current is 127.4 milliseconds. Furthermore, results show that there is corresponding relationship among the duration of continuing current, the inter-stroke interval just preceding the interval containing continuing current, and the electric field change of stroke initiating continuing current: the smaller the inter-stroke interval just preceding the interval containing continuing current and the electric field change of stroke initiating continuing current, the longer the duration of continuing current. In addition, two positive CG lightning flashes have been calculated by using the nonlinear least-square method. The results show that the two positive CG lightning flashes occurred at 7.6 km and 7.0 km above mean sea level, respectively. And 38 coulombs quantity of electricity and 36 coulombs quantity of electricity have been neutralized during discharge process for these two flashes, respectively. |
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| Keywords: | Da Hinggan Ling forest region thunderstorm CG flash continuing current |
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