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华北地区一次中尺度对流系统上方的Sprite放电现象及其对应的雷达回波和闪电特征

王志超 杨静 陆高鹏 刘冬霞 王宇 肖现 郄秀书

王志超, 杨静, 陆高鹏, 刘冬霞, 王宇, 肖现, 郄秀书. 华北地区一次中尺度对流系统上方的Sprite放电现象及其对应的雷达回波和闪电特征[J]. 大气科学, 2015, 39(4): 839-848. doi: 10.3878/j.issn.1006-9895.1412.14232
引用本文: 王志超, 杨静, 陆高鹏, 刘冬霞, 王宇, 肖现, 郄秀书. 华北地区一次中尺度对流系统上方的Sprite放电现象及其对应的雷达回波和闪电特征[J]. 大气科学, 2015, 39(4): 839-848. doi: 10.3878/j.issn.1006-9895.1412.14232
WANG Zhichao, YANG Jing, LU Gaopeng, LIU Dongxia, WANG Yu, XIAO Xian, Qie Xiushu. Sprites over a Mesoscale Convective System in North China and the Corresponding Characteristics of Radar Echo and Lightning[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(4): 839-848. doi: 10.3878/j.issn.1006-9895.1412.14232
Citation: WANG Zhichao, YANG Jing, LU Gaopeng, LIU Dongxia, WANG Yu, XIAO Xian, Qie Xiushu. Sprites over a Mesoscale Convective System in North China and the Corresponding Characteristics of Radar Echo and Lightning[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(4): 839-848. doi: 10.3878/j.issn.1006-9895.1412.14232

华北地区一次中尺度对流系统上方的Sprite放电现象及其对应的雷达回波和闪电特征

doi: 10.3878/j.issn.1006-9895.1412.14232
基金项目: 国家重点基础研究发展计划(973计划)项目2014CB441405, 中国科学院百人计划项目2013068

Sprites over a Mesoscale Convective System in North China and the Corresponding Characteristics of Radar Echo and Lightning

  • 摘要: 利用低光度相机首次观测到了2013年7月31日华北地区一次中尺度对流系统(MCS)上空产生的中高层Sprite放电现象。结合闪电定位、天气雷达等同步观测, 对一次MCS诱发的Sprite的形态学特征及其对应的母体闪电和雷暴系统的雷达回波特征等进行了详细分析。研究除发现了2例圆柱型、3例胡萝卜型和1例舞蹈型 Sprite外, 还发现了2例发光主体发育不完全的Y字型Sprite。估算的Sprite的底部平均高度低于61.8±3.5 km, 顶部平均高度为84.3±6.8 km。Sprite持续时间算术平均值为25.7±9.8 ms, 几何平均值为24.4 ms。Sprite的母体闪电均为正地闪, 峰值电流在+62.5~+106.2 kA之间, 算术平均值为+77.1±22.2 kA, 是本次MCS所有正地闪平均峰值电流的1.4倍。Sprite母体闪电的脉冲电荷矩变化(iCMC)在+475~+922 C km之间, 几何平均值为+571.0 C km。Sprite母体闪电发生在MCS雷达回波25~35 dBZ的层状云降水区, 弱回波(<30 dBZ)面积的突然增加对Sprite的产生有重要指示作用。Sprite易发生在MCS成熟—消散阶段正地闪比例(POP)显著增加的时段。在本次MCS消散阶段中, 有两个时间段可能有利于产生Sprite。在Sprite集中发生时间段, 北京闪电综合探测网(BLNET)探测到的正地闪比例为54.2%, 正地闪连续电流比例70.24%, 连续电流持续时间为58.17±50.31 ms, 有利于Sprite的产生。
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出版历程
  • 收稿日期:  2014-07-25
  • 修回日期:  2014-12-23

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