DING Shuai,XIAO Tiangui.Analysis of Doppler Radar Echo Characteristics of Hail in Yan’an[J].Journal of Chengdu University of Information Technology,2020,35(05):547-553.[doi:10.16836/j.cnki.jcuit.2020.05.012]
延安冰雹多普勒雷达回波特征分析
- Title:
- Analysis of Doppler Radar Echo Characteristics of Hail in Yan’an
- 文章编号:
- 2096-1618(2020)05-0547-07
- Keywords:
- meteorology; short and medium-term weather forecast; hail; supercell storm; Doppler weather radar
- 分类号:
- P458.2
- 文献标志码:
- A
- 摘要:
- 为对延安市消雹和防灾减灾的工作提供指导,利用NCEP再分析资料、常规天气资料和延安 C波段多普勒天气雷达资料详细分析2016年6月12日发生在延安安塞区特大冰雹过程,得到以下结论:(1)西北气流型天气形势配合着适宜的0℃层和-20 ℃层,为此次大冰雹过程提供了良好的环境条件。(2)在雷达反射率因子上,此次强对流风暴表现出典型超级单体所具有的回波特征,包括风暴中低层的“ V”型缺口、钩状回波、三体散射、有界弱回波区及中高层出现的回波悬垂现象,风暴发生到最强盛阶段反射率因子最大值高于65 dBz且强中心高度在-20 ℃层之上。(3)过程中出现中气旋特征,中气旋维持1小时,最大厚度达到5 km,此次冰雹就发生在中尺度气旋处以及大风区一侧的风速辐合区。(4)垂直累积液态水含量( VIL)在发生冰雹前出现跃增变化,此次降雹后VIL没有突然下降,反而增大是由于风暴内存在多个强中心风暴持续发展导致。
- Abstract:
- In order to provide guidance for the work of hail elimination and disaster prevention and reduction in Yan’an, NCEP reanalysis data, conventional weather data and Yan’an C-band Doppler weather radar data were used to analyze the mega incident in detail that occurred in Yan’an Ansai District on June 12, 2016. The following conclusions were obtained during the hail process:(1)The northwest airflow weather conditions combined with appropriate 0 ° C and negative20 ℃ layers provided good environmental conditions for the large hail process.(2)On the radar reflectivity factor, the strong convective storm showed the echo characteristics of typical supercells, including "V" notches in the middle and lower layers of the storm, hook echoes, three-body scattering and boundedness. In the weak echo area, and in the middle and upper layers, the overhang of the echo occurs. The maximum reflectance factor is higher than 65 dBz and the strong center height is above the negative 20 ℃ layer.(3)During the process, the characteristics of the mesocyclone appeared. The mesocyclone maintained for 1 hour and the maximum thickness reached 5 km. This time, the hail occurred in the mesoscale cyclone and the wind speed convergence area on one side of the gale zone.(4)The vertical accumulated liquid water content(VIL)changed rapidly before the occurrence of hail. After this hailfall, the VIL did not decrease suddenly, but increased slightly due to the continuous development of multiple strong central storms within the storm.
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备注/Memo
收稿日期:2019-11-07
基金项目:国家重点研发计划资助项目(2018YFC1506104)