一次由西南涡引发的暴雨天气过程分析
首发时间:2019-12-04
摘要:利用NCEP的2.5°*2.5°再分析资料以及地面历年降水实测资料,分析在2011年9月17-18日四川东北部以及陕西等地出现的暴雨天气过程,对此次暴雨过程的天气形势以及物理量进行研究。结果表明:500hPa环流形势稳定,700hPa切变线辐合抬升,暴雨区域高层辐散,低层辐合,并且垂直方向上气流为一致的上升运动,低层水汽条件良好,结合温度得到空气高层干冷低层暖湿的配置,为降水提供有利的不稳定层结与能量。由此得到,促使此次暴雨发生的有利条件是稳定的环流形势,充足的水汽输送,强烈的上升运动,不稳定层结的出现以及较长的持续时间。
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Analysis of a Heavy Rainstorm Event Caused by Southwest Vortex
Abstract:Using the 2.5°*2.5° reanalysis data of NCEP and the measured precipitation data over the years, we analyzed the heavy rain weather process in the northeast of Sichuan and Shanxi in September 17-18, 2011, the weather situation of the heavy rain process and physical quantities. The results show that the 500hPa circulation is stable, the 700hPa shear line converges and rises, the high-level and low-level converges in the rainstorm area, and the air flow in the vertical direction is the same ascending motion, and the water vapor condition in the low-level is good. Combining with the temperature, the configuration of the air high-level dry cooling and low-level warm and wet is obtained, which provides favorable unstable stratification and energy for precipitation. It is concluded that the favoAnalysis of a Heavy Rainstorm Event Caused by Southwest Vortexrable conditions for this rainstorm are stable circulation situation, sufficient water vapor transportation, strong upward movement, appearance of unstable stratification and long duration.
Keywords: Southwest vortex heavy rain ascending movement water vapor
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一次由西南涡引发的暴雨天气过程分析
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