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| 冰雹云中闪电特征观测研究 |
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李照荣1,2, 付双喜1, 李宝梓1, 蒋林3
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1.甘肃省人工影响天气办公室, 甘肃, 兰州, 730020;2.中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室, 甘肃, 兰州, 730020;3.民航兰州空中交通管理中心, 甘肃, 兰州, 730087
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| 摘要: |
| 通过对西北地区11次冰雹过程闪电定位仪和多普勒雷达观测资料的分析结果表明,闪电5 min频次分布呈现规律变化,在降雹前4～97 min出现频次大于20次的峰值,冰雹过程正地闪占总地闪比值在24.7%～40%之间;闪电密度最大中心区出现在降雹位置之前,闪电逐时空间分布标识出冰雹云的发展移动路径;闪电分布在雷达回波区,并不与雷达最强回波区对应,闪电频次、正地闪所占的比值和闪电时间序列分布,可能起到预警冰雹的作用。 |
| 关键词: 闪电频次 闪电密度 预警冰雹 |
| DOI： |
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| 基金项目:科技部社会公益性研究课题"西北地区防雹消雹技术"(2002DIB10046);"闪电定位仪应用研究";"测雨雷达现场指挥作业研究"等资助 |
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| OBSERVING STUDY LIGHTNING CHARACTERISTICS ON HAIL CLOUD |
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LI Zhao-rong1,2, FU Shuang-xi1, LI Bao-zi1, JIANG Lin3
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1.Gansu Administration of Weather Modification, Lanzhou 730020, China;2.Key Laboratory of Arid Climatic Change and Reducting Disaster of Gansu Province/Lanzhou Institute of Arid Meteorology, Lanzhou 730020, China;3.Lanzhou Air Traffic Administration Center of Civil Aviation, Lanzhou 730087, China
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| Abstract: |
| Atmospheric lightning are closely linked to hail clouds.Composite data of lightning positioning and tracking and Doppler radar echoes in 11 hail processes occurring in northwest of China are analyzed,with the finding that the 5-min.lightning frequency is regularly distributed and there are hail processes exceeding 20 times 4～97 minutes ahead of hail occurrence and the rates of positive C-G lightning are between 24.7%～40%.The core of lightning density appears in front of the hail zone.Hourly spatial distribution lead to the revelation of the migratory route of hail clouds development.The distribution of lightning does not coincide with the area of the radar strongest echoes.The frequency of lightning,the ratio of positive C-G lightning and the time series distribution of lightning may be used as pre-warnings for hails. |
| Key words: lightning frequency lightning density forecasting hail |