2019年6月桂北一次持续暴雨过程特点及诊断分析  

Process Characteristics and Diagnostic Analysis of a Continuous Rainstorm in Northern Guangxi in June 2019

作　　者：张凌云 刘蕾 苏小玲 ZHANG Ling-yun(Guangxi Liuzhou Meteorological Bureau,Liuzhou,Guangxi 545001)

机构地区：[1]广西柳州市气象局,广西柳州545001

出　　处：《农业灾害研究》2021年第7期49-52,54,共5页Journal of Agricultural Catastrophology

基　　金：广西重点研发计划项目(桂科AB19110028);柳州市重点研发计划项目(2018BK10501)。

摘　　要：利用NECP再分析资料、常规资料和区域自动气象站资料,分析了2019年6月5~13日桂北地区的持续暴雨天气过程特点,从环流形式场、重直速度场、散度场以及经向风、纬向风等方面深入分析持续暴雨的动力和触发机制。结果表明:(1)暖区暴雨阶段的触发机制主要是高空槽叠加在低空急流上的动力作用,这一阶段高空西风槽具有主导作用;(2)在锋面暴雨阶段,为高空西风槽、低空切变线和地面冷空气共同触发,西风槽表现得比暖区暴雨阶段更加明显;(3)散度场的低层辐合、高层辐散特征在暖区暴雨阶段表现得较弱,在锋面暴雨阶段表现得较强。Using NECP reanalysis data,conventional data and regional automatic weather station data, the characteristics of the continuous rainstorm weather process in northern Guangxi from June 5 to 13, 2019 are analyzed. The dynamic and triggering mechanism of continuous rainstorm are deeply analyzed from the aspects of circulation form field, gravity direct velocity field, divergence field, meridional wind and zonal wind. The results show that:(1) the triggering mechanism of rainstorm stage in warm region is mainly the dynamic effect of high-altitude trough superimposed on low-level jet, and the highaltitude westerly trough plays a leading role in this stage;(2) In the frontal rainstorm stage, it is triggered by the upper westerly trough, the low-level shear line and the ground cold air.The westerly trough is more obvious than the warm rainstorm stage;(3) The characteristics of low-level convergence and high-level divergence of divergence field are weak in the warm region rainstorm stage and strong in the frontal rainstorm stage.

关 键 词：西风槽 低空急流 经向风 纬向风 

分 类 号：P426[天文地球—大气科学及气象学]