成都龙泉驿区暴雨影响系统分析

Analysis of Rainstorm Influence System in Longquanyi District of Chengdu

利用2009~2019年龙泉驿区内19个自动观测站的逐时降水量,选取8例暴雨分析其主落区,并通过欧洲中心(ECMWF)的位势高度、UV风场、散度、涡度等再分析资料,网格距0.25˚ ×0.25˚,合成分析其环流形势和影响系统,得到以下结论:1) 选取的例子中,降水主落区主要出现在北部和南部。2) 通过分析500 hPa环流形势,可将这8例暴雨归纳为平直西风、东高西低、两高切变、500 hPa低涡、东风波动型共5种。3) 在这些天气系统下,龙泉驿区的散度、涡度、垂直速度等物理量剖面图都反映出存在低层辐合高层辐散,对流旺盛的有利于暴雨产生和发展的系统。

Based on the hourly precipitation of 19 automatic observation stations in Longquanyi District from 2009 to 2019, 8 rainstorms were selected to analyze their main precipitation area. Through reanalysis of geopotential height, UV wind field, divergence, vorticity and other data in the ECMWF, with horizontal resolution of 0.25˚ ×0.25˚ were used to analyze their circulation situation and influence system, and the following conclusions were drawn: 1) In the selected examples, the main precipitation areas mainly appear in the north and south. 2) Through the analysis of the 500 hPa circulation patterns, the 8 rainstorms can be classified into five types: straight westerly type, high in the east and low in the west type, two high-pressure system shear types, 500 hPa low vortex type and easterly wave type. 3) Under these weather systems, the profiles of physical parameters such as divergence, vorticity and vertical velocity in Longquanyi District all reflect the existence of convergence at the lower level and divergence at the upper level, and the system with strong convection is conducive to the generation and development of rainstorm.