摘要
春季暴雨常由暖区降水和锋面降水结合而成,对流性明显,对春耕生产和人员安全有较大影响。本文应用地面加密观测资料、常规探测资料和雷达回波资料,对2018年3月19～20日福建省暴雨过程的环流形势背景、中尺度特征和物理量场进行分析。结果表明:本次暴雨是一场暖区降水和锋面降水结合的暴雨过程。高低空西南急流充沛的水汽输送和不稳定能量,锋面、低层切变的辐合上升运动是形成暴雨和强对流的有利条件。冷暖空气的交汇加剧了层结不稳定和垂直上升运动,触发福建南部飑线产生。中高层显著的正涡度发展、低层辐合高层辐散以及上干下湿的对流不稳定都有利于激发释放大量不稳定能量,产生暴雨和强对流天气。
Spring rainstorm is usually formed by the combination of warm area precipitation and frontal precipitation,with obvious convection,which has a great impact on spring farming production and personnel safety.In this paper,the circulation situation background,Mesoscale Characteristics and physical quantity field of the heavy rain process in Fujian Province from March 19 to 20,2008 are analyzed by using ground intensive observation data,conventional sounding data and radar echo data.The results show that the rainstorm is a rainstorm process combined with warm precipitation and frontal precipitation.The abundant water vapor transport and unstable energy,the convergent and upward movement of frontal and low-level shear are favorable conditions for the formation of heavy rain and strong convection.The intersection of cold and warm air aggravates stratification instability and vertical upward movement,triggering the formation of squall line in southern Fujian.Significant positive vorticity development in the middle and upper levels,convergence in the lower level,divergence in the upper level and convective instability in the upper dry and lower humidity are conducive to exciting and releasing a large amount of unstable energy,resulting in heavy rain and severe convective weather.
作者
陈婧
李汉菁
林珠应
Chen Jing;Li Hanjing;Lin Zhuying(Meteorological Bureau of Changle District,Fuzhou City,Fujian Province,Changle 350200)
出处
《现代农业研究》
2018年第9期83-85,100,共4页
Modern Agriculture Research
关键词
春季暴雨
西南急流
锋面
短时强降水
飑线
spring torrential rain
southwest jet
front
short time heavy rainfall
squall line
