摘要
本文用较密集的观测资料分析江淮地区一次冷锋后的飑线过程。分析表明飑线的生成和发展与中尺度冷涌活动有关,它具有大振幅重力波的特征。重力波在传播过程中于大别山东侧形成边缘锋,边缘锋的传播更类似于沿岸 Kelvin 波,大振幅重力波在边界层特征更明显。这类被地形拦截的大振幅重力波是江淮地区冷锋后飑线的一种可能激发机制。
In this paper,a squall process occurring behind the cold front in Chang Jiang—Huai He area is analysed with the help of the enhanced observational data.The analysis shows the genesis anddevelopment of squall are related to the mesoscale cold surge activities.The cold surge is charac-terized by the large amplitude gravity wave.The gravity wave is trapped by Dabie Shan Mountainin the process of propagation and the edge front is formed at the east side of Dabie Shan Moun-tain.The propagation of edge front shows the feature similar to Kelvin wave.The character oflarge amplitude gravity wave in the boundary layer is very obvious.This kind of large amplitudegravity wave trapped by the mountain may be a trigger mechanism of the squall line behind thecold front.
出处
《应用气象学报》
CSCD
北大核心
1992年第2期136-144,共9页
Journal of Applied Meteorological Science
基金
国家自然科学基金
