一次罕见的山东暴雪天气的对称不稳定分析

Symmetry Instability Analysis of an Unusual Storm Snow in Shandong Province

采用对称不稳定判据 ,对发生在 2 0 0 1年 1月 6～ 7日的一次罕见的山东暴雪天气过程进行了分析 ,结果表明 :暴雪产生在对称不稳定大气中 ,低空急流促使对流层低层暖湿气流辐合上升 ,触发对称不稳定能量释放 ,产生暴雪天气。江淮气旋和暴雪区有向对称不稳定区移动的趋势。

By using symmetry instability criterion,an unusual storm smow appeared on January 6 to 7,2001 in Shandong Province is analysed,the results show that the storm snow occurred in the symmetry instability atmosphere,low-level jet caused warm and humid air converging and ascending in lower troposphere and stimulated the symmetry instability energy releasing and then the event of storm snowfall occurred.The Changjiang-Huaihe cyclone and the region of storm snow moved towards the area of symmetry instability.