摘要
利用常规资料和建阳新一代天气雷达资料对2013年5月16日闽北大暴雨过程进行初步分析。结果表明,该次强降水过程是发生在高层有低槽东移和低层为低涡切变东移南压(并有西南风急流配合)、切变南侧的风速辐合的有利天气形势下。从物理场看,该次强降水过程暴雨区有充足的水汽供应,暴雨区上空有强的上升运动(涡度场上为低层正涡度、高层负涡度的配置;散度场上为低层辐合高层辐散的配置)。从雷达资料看,上游地区不断有对流单体补充并入主体回波,回波移向与强核回波带走向一致,产生明显的"列车效应",是导致该次强降水持续的主要原因。
Conventional data and the new-generation weather radar data were used to analyze the process of heavy rainstorm on May 16, 2013. The results show that this heavy rainstorm occurs in the high level where low trough moves eastwanl, and in the low level where low vortex shears eastward and southward （together with southwest rapid stream）, and wind speed converges in south of the shear. From the perspective of physical field, the rainstorm has sufficient mois- ture supply in rainstorm anna, and strong upward movement high up in the air （low-level positive vorticity and negative vorticity in tile vorticity field; low-level convergency and high-level divergenee in divergence fieht）. According to radar data, convection cells supplement main echo, echo moves in the same direction with the strong nuclear echo band, which produce the obvious ＂Effect of Train＂, it is also the major cause of this constant rainstorm.
出处
《农业灾害研究》
2014年第7期35-38,共4页
Journal of Agricultural Catastrophology
关键词
大暴雨
短时强降水
列车效应
过程分析
Heavy rainstorm
Short-term heavy rainstorm
Effect of train
Process analysis
