违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 基于高时间分辨率快电场变化资料的北京地区地闪回击统计特征-Characteristics of cloud-to-ground lightning return strokes in Beijing based on high time resolution data of fast electric field change
doi:  10.3878/j.issn.1006-9585.2016.16007
基于高时间分辨率快电场变化资料的北京地区地闪回击统计特征

Characteristics of cloud-to-ground lightning return strokes in Beijing based on high time resolution data of fast electric field change
摘要点击 390  全文点击 153  投稿时间:2016-01-08  最后修改时间:2016-05-30
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基金:  国家自然科学基金;国家重点基础研究发展计划
中文关键词:  正地闪  负地闪  回击过程  波形特征参数  北京地区
英文关键词:  Positive CG flashes  Negative CG flashes  Return stroke  Waveform characteristic parameter  Beijing regions
     
作者中文名作者英文名单位
黎勋lixun中国科学院大气物理研究所
郄秀书qiexiushu中国科学院大气物理研究所
引用:黎勋,郄秀书.2016.基于高时间分辨率快电场变化资料的北京地区地闪回击统计特征[J].气候与环境研究
Citation:lixun,qiexiushu.2016.Characteristics of cloud-to-ground lightning return strokes in Beijing based on high time resolution data of fast electric field change[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      本文利用2014年北京闪电网观测到的四站及以上同步高时间分辨率闪电快电场变化资料,对北京地区5次雷暴过程中304次正地闪和1467次负地闪的回击特征进行了统计分析,主要包括:回击次数、10%-90%上升时间、下降时间、半峰值宽度、回击间隔、回击峰值电场强度、回击间隔和回击序数的关系等。结果表明,正、负地闪中单回击地闪所占比例分别为91.8%和24.3%,单次负地闪的平均回击次数为3.8,观测到的最大回击数可达20次。304次正地闪首次回击的10%-90%上升时间、下降时间和半峰值宽度的几何平均值分别为3.6 μs、10.6 μs和4.8 μs;27次正地闪继后回击对应值分别为3.3μs、10.6μs和4.8μs;1467次负首次回击的对应值分别为2.2 μs、11.3 μs和3.7 μs;4103次负继后回击的对应值分别为1.5 μs、9.9 μs和2.8 μs。正、负地闪的回击间隔服从对数正态分布,其几何平均值分别为101 ms和59 ms。平均回击间隔随着回击序数的增加有逐渐减小的趋势。最后,还对70次正回击、421次负首次回击和789次负继后回击峰值电场进行了统计,将其归一化到100 km的平均值分别为11.2 V/m、7.2 V/m和5.0 V/m。平均来看,负地闪首次回击峰值电场比继后回击峰值电场大1.4倍,但是有23.5%的继后回击峰值电场大于其对应的首次回击。
Abstract:
      Return stroke waveform characteristics of 304 positive Cloud-to-Groud (CG) flashes and 1467 negative CG flashes from five storms in Beijing regions were analyzed based on high time resolution data of fast electric field change collected by Beijing Lightning Network ( BLNET ). The characteristic parameters presented in this work are : number of strokes per flash, 10%-90% risetime, falling time, full width at half maxmum (FWHM), interstroke interval, peak electric field and the relationship between the interstroke interval and the stroke order, etc. The results indicate that the percentage of single stroke in positive and negative CG flashes is 91.8% and 24.3%, respectively. The average number of stroke per flash for negative CG flashes is 3.8 and the max stroke number is 20. The geometric mean of 10%-90% risetime, falling time, half-peak width for 304 first strokes of positive CG flashes are 3.6 μs, 10.6 μs and 4.8 μs; the corresponding value for 27 subsequent strokes of positive CG are 3.3μs, 10.6μs and 4.8μs; the corresponding value for 1467 negative first strokes are 2.2 μs, 11.3 μs and 3.7 μs and the corresponding value for 4103 negative subsequent strokes are 1.5 μs, 9.9 μs and 2.8 μs, respectively. In addition, interstroke intervals of positive and negative CG flashes show a more or less log-normal distribution and give geometric mean value of 101 ms and 59 ms. Moreover, the geometric mean interstroke interval for negative CG flashes of particular multiplicity tends to decrease with the stroke orders. Finally, peak electric field of 70 positive, 421 negative first and 789 negative subsequent strokes, when normalized to 100 km, are 11.2 V/m, 7.2 V/m and 5.0 V/m respectively. On average, peak electric field for first stroke is 1.4 times larger than its subsequent counterpart for negative CG flashes, but about 23.5% of subsequent return strokes are stronger than the corresponding first stroke.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
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