四川两次极端暴雨强降水特征及与雷达回波和闪电关系分析
Characteristics of Heavy Precipitation and Its Relationship with Radar Echo and Lightning in Two Extreme Rainstorms in Sichuan
周威 1魏庆 2杨康权 1康岚 1罗辉 1黄楚惠1
作者信息
- 1. 四川省气象台,成都 610072;高原与盆地暴雨旱涝灾害四川省重点实验室,成都 610072
- 2. 四川省防雷中心,成都 610072
- 折叠
摘要
选取了 2020年 8月四川两次历史性极端暴雨过程,根据量级和持续时间对强降水进行划分,分析其时空分布特征及与雷达回波和闪电的关系.结果表明:短时强降水主要发生在 22时—次日 03时,降水强度为 30～<50 mm/h的站次最多,区域集中在盆地西部.随着降水量级的增加,站点对应的闪电密度均增大,小时平均回波、最强回波、最弱回波均呈增强的趋势.随着降水持续时间的增加,站点对应的负地闪平均强度增强.第一次过程强降水站次与闪电频次的高值中心具有良好的对应关系.第二次过程随着降水量级增大,对应的回波均方根误差减小,而第一次过程则相反.
Abstract
Two historical extreme rainstorm processes of Sichuan Province in August 2020 were selected,the heavy precipitation was divided in terms of magnitude and duration,and its spatio-temporal distribution characteristics and relationship with radar echoes and lightning were analyzed.The results show that the short-time heavy precipitation mainly occurs in the period of 22:00～03:00,and the sta-tions of 30～<50 mm/h are the most,and the region is concentrated in the western part of the basin.With the increase of precipitation level,the corresponding lightning density increases,and the hourly mean echo,the strongest echo and the weakest echo all show a trend of en-hancement.With the increase of precipitation duration,the average intensity of negative ground flash increases.There is a good corres-pondence between the number of heavy precipitation stations and the high value center of lightning frequency in the first process.In the second process,with the precipitation level increases,the corresponding root mean square error of the echo decreases,while the first pro-cess is the opposite.
关键词
极端暴雨/短时强降水/时空特征/雷达回波/闪电Key words
Extreme rainstorm/Short-time heavy precipitation/Temporal and spatial characteristics/Radar echo/Lightning引用本文复制引用
基金项目
四川省科技计划重点研发项目(2022YFS0542)
高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目青年专项(SCQXKJQN202109)
高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目青年专项(SCQXKJQN202227)
四川省自然科学基金项目(2023NSFS0242)
中国气象局西南区域气象中心川藏铁路气象服务技术创新团队基金()
出版年
2024
NETL
NSTL
万方数据