摘要
为了监测预警极端短时强降水的发生,减少极端短时强降水造成的灾害,基于降水资料、天气图、雷达拼图、雷达PUP产品等资料和技术分析方法,对2023-08-27 T 20:00/2023-08-28 T 20:00乐平港边极端短时强降水事件进行分析,结果表明:强降水由丰城、南昌至景德镇东北-西南向的中尺度雨带造成,其中乐平中部港边24 h雨量达195.8 mm,小时最大雨强达102.8 mm,为2023年景德镇地区强降水之最;强降水与闪电密切相关,最强降水时段闪电最为密集;强降水与强劲的副热带高压阻挡有关,回波东移受阻,移动缓慢,冷暖空气较长时间对峙、交汇,前倾槽、低层辐合、高层辐散与充沛的水汽供应导致极端强降水;强降水由较大范围35~45 dBZ回波中伴有少量45~50 dBZ的絮状强回波造成,其间回波稳定少动、合并,单部雷达上表现为中等强度垂直累积液态水含量、垂直的柱状结构、低质心、正负速度辐合等特征。研究结果为极端短时强降水的临近预报提供了参考依据。
In order to monitor and warn of the occurrence of extreme short term heavy rainfall and reduce the disasters caused by extreme short term heavy rainfall,precipitation data,weather maps,radar puzzles,radar PUP products and technical analysis methods were used to analyze the extreme short term heavy rainfall events at Gangbian in Leping from 20:00 on August 27,2023 to 20:00 on August 28,2023.The results show that the heavy rainfall is caused by mesoscale rain bands from Fengcheng,Nanchang to Jingdezhen in a northeast southwest direction.The 24-hour rainfall at the center of Gangbian in Leping reached 195.8 mm,with a maximum hourly rainfall intensity of 102.8 mm,which is the highest precipitation in the Jingdezhen area in 2023.The heavy precipitation is closely related to lightning,and lightning is most concentrated during the strongest precipitation period.The heavy precipitation is related to the strong subtropical high pressure obstruction,which hinders the eastward movement of echoes and causes slow movement.Cold and warm air confront and intersect for a long time,leading to extreme heavy precipitation due to forward leaning troughs,low level convergence,high level divergence,and abundant water vapor supply.The heavy precipitation is caused by a large range of 35-45 dBZ echoes accompanied by a small amount of 45-50 dBZ flocculent strong echoes.During this period,the echoes remain stable with little movement and merge.On a single radar,they exhibit medium intensity,vertical columnar structure,low center of mass,and velocity convergence.These conclusions provide a reference for the near prediction of extreme short term heavy rainfall.
作者
郑卡妮
Zheng Kani(Leping Meteorological Bureau,Jiangxi Province,Jingdezhen 333300)
出处
《气象水文海洋仪器》
2024年第3期76-79,83,共5页
Meteorological,Hydrological and Marine Instruments
基金
国家自然科学基金项目(41975001)
景德镇市科技计划项目(2022SF003)
江西省气象科技项目(JX2022M03)资助。
关键词
乐平市港边村
极端短时强降水
天气图分析
雷达回波特征
Gangbian Village in Leping City
extreme short term heavy rainfall
weather map analysis
radar echo characteristic
