摘要
文章利用NCEP fnl再分析资料对2000-2020年永州地区所有暴雨过程进行了环境场关键物理量提取,在获取物理量的基础上,比较不同类型暴雨过程的环境场差异,提出预报关键因子。结果表明:各相关物理量在暴雨过程中基本呈现发生前和发生时较大,发生后减弱的变化趋势;热带低值系统型暴雨的各物理量均值与低涡冷槽型和暖倒槽锋生型暴雨存在较大差异,而暖倒槽锋生型暴雨的各物理量均值普遍低于其他类型;低涡冷槽型的各物理量分布更为集中,暖倒槽锋生型和热带低值系统分布相对离散;不同类型的天气形势下,低层水汽通量散度、比湿、散度阈值存在明显差异。
Based on the NCEP fnl reanalysis data,the key physical quantities of the environmental field of all rainstorm processes in Yongzhou area from 2000 to 2020 were extracted.On the basis of obtaining physical quantities,the environmental field differences of different types of rainstorm processes are compared,and the key forecast factors are put forward.The results show that the relevant physical quantities in the rainstorm process are basically larger before and during the occurrence,and weaken after the occurrence.The mean values of the physical quantities of the tropical low value system type rainstorm are signifcantly different from those of the vortex cold trough type and the warm inverted trough frontogenesis type rainstorm,while the mean values of the physical quantities of the warm inverted trough frontogenesis type rainstorm are generally lower than those of other types.The distribution of various physical quantities is more concentrated in the low vortex cold trough type,and the distribution of warm inverted trough frontogenesis type and tropical low value system is relatively discrete.For different types of weather conditions,there are obvious differences in the divergence,specific humidity and divergence threshold of low level water vapor flux.
作者
刘沈
付炜
江勇
黄杰贞
Liu Shen;Fu Wei;Jiang Yong;Huang Jiezhen(Yongzhou Meteorological Bureau of Hunan,Yongzhou 425000;Zhuzhou Meteorological Bureau of Hunan,Zhuzhou 412000)
出处
《气象水文海洋仪器》
2024年第1期88-91,共4页
Meteorological,Hydrological and Marine Instruments
基金
湖南省气象局预报员专项暴雨预报项目(XQKJ19C015)
湖南省气象局2021年重点课题(XQKJ21A001)资助。
关键词
暴雨
环境场
物理量
差异
rainstorm
environmental field
physical quantity
difference
