摘要: |
利用2016-2019年贵州省人工影响天气作业站点上报信息、市(州)的灾情快报,以及毕节、贵阳、兴义3部新一代多普勒天气雷达资料等,分析贵州中西部7个具有多阶跃增特征的雹云单体的雷达参数演变特征,研究发现:(1)二阶跃增冰雹云演变呈发展-跃增-降雹-减弱-再发展-跃增-降雹的趋势;(2)降雹时刻,雹云的最大反射率因子(MaxREF)、45dBz回波高度(H45dBz)、回波顶高(H0dBz)、垂直累积液态水含量(VIL)平均值分别为63.4 dBz、7.55km、12.01km、39.08 kg/m2;大冰雹对应的MaxREF和VIL较小冰雹更大,大冰雹、小冰雹的H45dBz差别不大,大冰雹对应的H0dBz反而小于小冰雹;(3)冰雹发生前,MaxREF、H45dBz、H0dBz和VIL两个体扫间平均最大跃变分别为:5.89 dBz、2.19km、2.82km、17.5 kg/m2,跃变现象的出现比冰雹发生时刻平均提前21.4、22.2、28、28.8min,可以作为冰雹发生前的重要判断依据。 |
关键词: 雹云单体;雷达参数演变;跃增特性 |
DOI: |
投稿时间:2022-10-29修订日期:2023-02-22 |
基金项目:中国气象局云雾物理环境重点开放实验室开放课题(批准号:2020Z007) |
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Analysis of transition characteristics of hail cloud in central and western Guizhou based on radar observation |
lihao,ZOU Shuping |
(Weather Modification Office of Guizhou Province) |
Abstract: |
Various parameters are inversed in the process of single hail cloud development by using 3 Doppler weather radar data and hail information, and the relationship between various parameters and occurrence of hailstorms is extracted With 7 single hailstorm cases during 2016-2019 in the central and western Guizhou Province.Results show that: (1)The evolution of the second-order jump hail cloud showed a trend of development-jump increase-hail falling-attenuation-redevelopment-jump increase-hail; (2)The averages of maximum radar base reflectivity(MaxREF),the height of 45dBz(H45dBz)and top of storm(H0dBz),vertically integrated liquid(VIL) are 63.4 dBz、7.55km、12.01km、39.08 kg/m2; (3) During the occurrence of hail, the sudden- increase phenomenon of MaxREF、H45dBz、H0dBz and VIL between the two volume scan are 5.89 dBz、2.19km、2.82km、17.5 kg/m2 on average.This transition occurred 21.4、22.2、28 and 28.8 min earlier than the average time of hailstorm occurrence.Such phenomenon could be an important criterion of hail warning. |
Key words: Hail; Doppler weather radar parameters ; transition characteristics |