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一次上行闪电中先导二维和三维发展特征的差异

关雨侬 吕伟涛 齐奇 武斌 马颖 陈绿文 刘恒毅 张义军

关雨侬, 吕伟涛, 齐奇, 等. 一次上行闪电中先导二维和三维发展特征的差异. 应用气象学报, 2023, 34(5): 598-607. DOI:  10.11898/1001-7313.20230508..
引用本文: 关雨侬, 吕伟涛, 齐奇, 等. 一次上行闪电中先导二维和三维发展特征的差异. 应用气象学报, 2023, 34(5): 598-607. DOI:  10.11898/1001-7313.20230508.
Guan Yunong, Lü Weitao, Qi Qi, et al. Difference between 2D and 3D development characteristics of an upward lightning leader. J Appl Meteor Sci, 2023, 34(5): 598-607. DOI:  10.11898/1001-7313.20230508.
Citation: Guan Yunong, Lü Weitao, Qi Qi, et al. Difference between 2D and 3D development characteristics of an upward lightning leader. J Appl Meteor Sci, 2023, 34(5): 598-607. DOI:  10.11898/1001-7313.20230508.

一次上行闪电中先导二维和三维发展特征的差异

DOI: 10.11898/1001-7313.20230508
资助项目: 

国家自然科学基金项目 42175108

中国气象科学研究院基本科研业务费专项 2021Z011

中国气象局气象探测工程技术研究中心和中国气象局大气探测重点开放实验室开放课题 U2021M05

详细信息
    通信作者:

    吕伟涛, 邮箱:wtlyu@cma.gov.cn

Difference Between 2D and 3D Development Characteristics of an Upward Lightning Leader

  • 摘要: 基于高时空分辨率的广州高建筑物雷电观测站双站(观测点1和观测点2)同步观测资料,对比分析2019年4月20日05:12(世界时)发生在广州塔上的一次上行闪电的先导二维和三维发展特征。分析表明:该上行闪电可三维重建的上行先导通道发展长度约为5.4 km,是对应两个观测点二维通道长度的1.5倍和1.38倍;由观测点1的高速摄像记录分析得到的上行先导二维发展速率变化范围为1.8×104~4.5×105 m·s-1(平均值为1.8×105 m·s-1);对应的上行先导三维发展速率变化范围为3.8×104~7.2×105 m·s-1(平均值为2.8×105 m·s-1);三维和二维发展速率之比变化范围为1~4.7,平均值为1.5;上行先导始发后10 ms内,三维与二维发展速率的变化趋势大致相同,均随高度增加而逐渐加快;10 ms后二维发展速率明显降低,平均值仅为10 ms内的42%,且随时间变化较小。而10 ms后的三维发展速率平均值为10 ms内的77%,随时间呈明显的不规则波动变化;先导通道与观测点间的距离以及通道发展方向与观测点视线方向的夹角是造成上行先导二维和三维发展速率差异的主要因素。
  • 图  1  快电场(a)和图像亮度(b)的同步变化波形

    Fig. 1  Waveforms of changes in fast electric field(a) and image brightness(b)

    图  2  正地闪接地点及观测点1、观测点2与广州塔的相对位置

    Fig. 2  Positions of Canton Tower relative to ground termination points of positive cloud-to-ground flash, station-1 and station-2

    图  3  FA19014先导二维速率随时间(a)以及随高度(b)变化

    Fig. 3  2D leader speed change with time(a) and change with height(b) of FA19014

    图  4  观测点1的HC-1(a)和观测点2的LCI-03(b)拍摄的此次上行闪电图像

    (为提升显示效果,对图像进行反相处理并对闪电通道进行增强)

    Fig. 4  Upward lightning images captured by HC-1 at station-1(a) and LCI-03 at station-2(b)

    (images are inverted and pixel values of lightning channel in images are enhanced for better display)

    图  5  闪电FA19014重建后的三维通道及在X-Y平面投影(a)、X-Z平面投影(b)以及Y-Z平面投影(c)

    Fig. 5  reconstruction channel of FA19014 and projection view on X-Y plane(a),X-Z plane(b) and Y-Z plane(c)

    图  6  FA19014先导三维速率随时间变化(a)以及随高度变化(b)

    Fig. 6  3D speed changes with time(a) and with height(b) of FA19014

    图  7  FA19014先导三维速率与二维速率及三维速率与二维速率之比随时间变化

    Fig. 7  3D speed,2D speed and their ratio change with time of FA19014

    图  8  三维速率和二维速率差异

    (a)三维速率和二维速率之比的实际值与理论值关系,(b)速率比实际值与理论值随时间变化, (c)三维闪电通道与观测点1在空间中的位置对比(灰色通道表示该部分三维速率与二维速率差异较大),(d)d1与φ随时间变化

    Fig. 8  Differences in velocity between 3D and 2D

    (a)actual ratio of 3D speed and 2D speed versus theoretical values of ratio, (b)changes of actual and theoretical ratio with time, (c)relative position of 3D reconstruction channel and station-1 in space (grey channel denotes huge difference between 3D and 2D speed), (d)changes of d1 and φ with ime

    表  1  本研究所用光学观测设备详细信息

    Table  1  Details of optical observation instruments in the study

    设备编号 观测站点 帧率/s-1 空间分辨率 记录时长/ms 预触发时长/ms 焦距/mm
    HC-1 观测点1 20000 1024 × 1024 50 25 14
    HC-3 观测点1 1000 1024 × 1024 1650 150 8
    LCI-03 观测点2 50 780 × 582 5
    下载: 导出CSV
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  • 收稿日期:  2023-02-08
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