干旱气象 ›› 2020, Vol. 38 ›› Issue (5): 771-781.DOI: 10.11755/j.issn.1006-7639(2020)-05-0771

• 论文 • 上一篇    下一篇

云贵高原斜坡过渡带一次大范围冰雹过程的闪电活动特征

曾勇1,丁旻2,罗雄1,邹书平1,周筠珺4,李丽丽3,黄钰1   

  1. 1.贵州省人工影响天气办公室,贵州 贵阳 550001;
    2.贵州省气象灾害防御技术中心,贵州 贵阳 550001;
    3.贵州省山地环境气候研究所,贵州 贵阳 550001;
    4.成都信息工程大学大气科学学院,高原大气与环境四川省重点实验室,四川 成都 610225
  • 出版日期:2020-10-30 发布日期:2020-10-30
  • 通讯作者: 丁旻(1984— ),男,高级工程师,主要从事雷电监测预警技术研究.E-mail: 272339087@qq.com。
  • 作者简介:曾勇,男,硕士,工程师,主要从事冰雹云监测预警技术与大气电学研究.
  • 基金资助:
    中国气象局云雾物理环境重点实验室开放课题(2018Z01602)和贵州省科技支撑计划项目(黔科合支撑\[2019\]2387号)共同资助

Characteristics of Lightning Activity During a Large-scale Hail Weather Process in the Slope Transition Zone of Yunnan-Guizhou Plateau

ZENG Yong1, DING Min2, LUO Xiong1, ZOU Shuping1,ZHOU Yunjun4, LI Lili3, HUANG Yu1#br#   

  1. 1. Weather Modification Office of Guizhou Province, Guiyang 550001, China;
    2. Guizhou Meteorological Disaster Prevention Technology Center, Guiyang 550001, China;
    3. Guizhou Institute of Mountainous Environment and Climate, Guiyang 550001, China;
    4. College of Atmospheric Science, Chengdu University of Information & Technology, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China
  • Online:2020-10-30 Published:2020-10-30

摘要: 利用VLF/LF三维闪电定位系统监测资料、MICAPS常规观测资料和地面降雹观测资料,对云贵高原斜坡过渡带一次大范围致灾冰雹天气过程的闪电活动特征及与降雹的关系进行分析探讨。结果表明:(1)南支槽的稳定维持与低层切变线、低空急流和地面辐合线的配合,触发了此次大范围冰雹天气过程;(2)降雹区域内总闪频次在降雹前后表现出“跃增”、“陡降”现象,且降雹前均出现了2σDFRDT跳跃预警信号,该信号平均超前于峰值信号7 min,两种信号对降雹均具有预警指示作用,且前者优于后者;(3)闪电的空间分布与冰雹云的移动路径基本一致,对冰雹云的移动发展有指示作用,雹区主要位于闪电发生位置的右侧。

关键词: 云贵高原斜坡过渡带, 冰雹云, 云闪, 地闪, 2σDFRDT跳跃信号

Abstract: Based on the monitoring data of VLF/LF three-dimensional lightning positioning system, MICAPS routine observation data and ground hail observation data, the lightning activity characteristics of a large-scale disaster-causing hail weather process in the slope transition zone of the Yunnan-Guizhou Plateau were analyzed, and the relation between lightning activity and hail falling was discussed. The results are as follows: (1) The stable southern trough in upper level cooperated with the lower level shear line, lower level jet and surface convergence line, which triggered the large-scale hail weather process. (2) The negative ground lightning dominated during the hail weather process, followed by cloud lightning and positive ground lightning. The frequency of total lightning appeared ‘jump increase’ and ‘sharp drop’ phenomena before and after the hail falling in hail area, respectively, and the jump characteristic of lightning frequency change rate more than two standard deviations (2σDFRDT) was obvious before the hail falling, the 2σDFRDT jump signal and peak of total lightning frequency were 20 minutes and 13 minutes ahead of the hail falling, respectively, so two signals had warning indicative significance for hail falling, while the former was better than the later. (3) The spatial distribution of lightning was basically consistent with the moving path of hail cloud, which was an indicator to the development and movement of hail cloud, and the hail areas were mainly located in the right side of lightning position.

Key words: the slope transition zone of Yunnan-Guizhou Plateau, hail cloud, cloud lightning, ground lightning, 2σDFRDT jump signal

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