我国南方冬季暴雪期间高空槽的
Case study of the development of trough during winter
中文摘要：
选取我国南方4次暴雪过程，利用欧洲中期天气预报中心ERA-Interim再分析资料，从准地转涡度方程出发，推导出扰动位涡拟能方程，从波动的角度研究暴雪期间高空槽的发展。结果表明，高空槽的出现对暴雪的发生发展极为重要，波流相互作用对高空槽的移动具有明显影响，槽底和槽前分别出现正效应和负效应，使得槽底出现正变高，槽前出现负变高，从而使得槽向东移动或者横槽转竖，有利于冷空气向南爆发和我国南方暴雪的产生。
中文关键词：
暴雪，高空槽，扰动位涡拟能，波流相互作用
KeyWords：
snowstorm, trough, eddy potential enstrophy, wave-mean interaction
Abstract：
Four snowstorms in southern China are selected, and the ERA-Interim reanalysis data are used to derive the eddy potential enstrophy equation from the quasi-geostrophic vorticity equation, and to study the development of the trough during the snowstorm from the perspective of wave. The results show that the appearance of the trough is extremely important to the development of the snowstorm, and the wave-mean interaction has an obvious effect on the movement of the trough. The positive and negative effects in the bottom and front of trough respectively make the trough bottom appear positive and the trough front appear negative, thus making the trough move eastward or the horizontal trough turn vertical, which is conducive to the outbreak of cold air to the south and the generation of snowstorm in the south of China.