摘要
利用常规观测、多普勒天气雷达、FY-4A卫星、美国国家环境预报中心(NCEP)再分析资料,对一次桂南暴雨过程中的短时强降水特征进行分析。结果表明:(1)高层辐散流场、中层副高和低槽、低层切变线为此次暴雨提供有利背景场。(2)中越边境和北部湾上空多个对流云团发展东移导致桂南对流性强降水,其冷云区的移动演变对降水落区有指示意义。(3)前期,多个对流单体形成“列车效应”导致暴雨;后期,地面中尺度辐合线有效组织分散对流活动触发强降水。(4)低层径向风辐合、中尺度涡旋及高层的辐散作用,是导致短时强降水的重要原因。(5)相应区域良好的热力、水汽及抬升条件有利于强降水的发生、发展。
Based on conventional observations data,Doppler weather radar data,FY-4A TBB data,and NCEP reanalysis data,the short-time heavy precipitation characteristic of a rainstorm process in southern Guangxi is analyzed.The results show that(1)The upper-level wind divergence,the mid-level subtropical high and trough,the low-level shear line provide a favorable background field for this rainstorm process.(2)The development and eastward propagation of several convective cloud clusters over the Sino-Vietnamese border and the Gulf of Beibu leads to the intensive convective precipitation in this region,and the movement and variation of their cold cloud areas is indicative of for the location of rainfall.(3)During the early stage,several convective cells form a'train effect'leading to the rainstorm,and in the late stage,surface mesoscale convergence lines,effectively organized the dispersed convective activity,and triggered rainstorm process.(4)The low-level convergence of radial wind,mesoscale eddies and upper-level divergence are important reasons for the shorttime severe precipitation.(5)The favorable thermal,water vapor and lifting conditions in the corresponding region are conducive to the occurrence and development of heavy precipitation.
作者
骆凯
程乘
杨志宏
付勇刚
LUO Kai;CHENG Cheng;YANG Zhihong;FU Yonggang(95072 Army of PLA,Nanning 530021,China)
出处
《气象研究与应用》
2023年第3期95-101,共7页
Journal of Meteorological Research and Application
基金
自立科研专项项目(ZZKY-YX-05-01)。
关键词
广西南部
短时强降水
中尺度分析
环境场
Southern Guangxi
short-time heavy precipitation
mesoscale analysis
environmental fields
