| 大兴安岭地区地闪回击辐射场特征 |
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| 引用本文： | 房广洋,王东方,曹冬杰,宣越健.大兴安岭地区地闪回击辐射场特征[J].气象科技,2012,40(4):656-660. |
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| 作者姓名： | 房广洋 王东方 曹冬杰 宣越健 |
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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;中国科学院研究生院,北京100049
2. 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，国家自然科学基金项目，中国科学院“百人计划”专项资助 |
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| 摘 要： | 利用慢电场变化测量仪所获取的观测资料详细分析了大兴安岭地区地闪回击辐射场特征。结果表明,35次正地闪首次回击的慢前沿、10%～90%平均上升时间分别为7.8μs、4.5μs,其中11次正地闪首次回击的过零时间、负反冲深度平均值分别为34μs、23%。76次负地闪首次回击的慢前沿、10%～90%平均上升时间分别为3.5μs、1.9μs,继后回击的慢前沿为1.4μs,其中15次负地闪首次回击的过零时间、负反冲深度平均值分别为51μs、52%。另外,正地闪首次回击的半峰值宽度大于负地闪首次回击,平均值分别为13.6μs、5.6μs。与国内外已有结果的进一步对比发现,大兴安岭地区的地闪回击辐射场特征与瑞典、美国弗罗里达的地闪回击辐射场特征有较好的一致性,但与我国内陆高原的地闪辐射场特征有明显差异。
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| 关 键 词： | 大兴安岭 地闪 回击 辐射场 |
| 收稿时间： | 2011/2/21 0:00:00 |
| 修稿时间： | 2011/5/31 0:00:00 |
Radiation Field Characteristics of Lightning Return Strokes in Daxing'an Mountain Range |
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| Fang Guangyang,Wang Dongfang,Cao Dongjie and Xuan Yuejian.Radiation Field Characteristics of Lightning Return Strokes in Daxing'an Mountain Range[J].Meteorological Science and Technology,2012,40(4):656-660. |
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| Authors: | Fang Guangyang Wang Dongfang Cao Dongjie and Xuan Yuejian |
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| Institution: | 1 (1 LAGEO,Institute of Atmospheric Physics,CAS,Beijing 100029;2 Graduate University of Chinese Academy of Sciences,Beijing 100049) |
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| Abstract: | The radiation field characteristics of cloud-to-ground（CG） lightning flashes in the Daxing’an Mountain Range are analyzed and compared with those of other researches from home and abroad by using the data obtained from a broadband slow antenna system with a high time resolution.It is found that for 35 positive CG flashes,the average duration of the slow-change period and the 10% to 90% rising period for the first return strokes are 7.8 μs and 4.5 μs,respectively,in 11 of which the average crossing time and overshoot depth are 34 μs and 23%,respectively;for 76 negative CG flashes,those are 3.5 μs and 1.9 μs,respectively,in 15 of which the crossing time and overshoot depth are 51 μs and 52%,respectively.The average half peak width of first return strokes of positive CG flashes is larger than that of negative CG flashes,with the average values being 13.6 μs and 5.6 μs.Compared with other observations both from home and abroad,the characteristics of radiation fields of return strokes of CG flashes at the Daxing’an Mountain Range are similar with those in Sweden and Florida of America,but different from those on the Qinghai-Tibet plateau. |
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| Keywords: | Daxing’an Mountain ground flashes radiation field return stroke |
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