相向而行的重力波与暴雨

The Gravity Wave of Relative Motion and Heavy Rain

本文对1988年7月21日天津地区大暴雨的天气过程进行了详细分析，发现这次暴雨是两个中尺度系统引起的两片雨区相向移动、合并而后加强形成的。研究表明这是两个相向而行的大气重力内波叠加的结果。

This paper analyzes an individual case of the heavy rain which occurred in Tianjin district on 21stJuly l988. It shows that the heavy rain was resulted from the relative motion of two rainning areas inthe east and the west, caused by two mesoscale systems. The two rain areas were intensified after merg-ing. One can see from the case study that this was the result of superposition of the two internal gravitywaves in relative motion.