【摘要】 <正> 许多重大天气灾害发生在特定地形条件下,例如山区的喇叭口地形容易有暴雨发生。山脉的阻碍以及造成的空气被迫抬升、绕流、穿谷流,地形的不同加热和摩擦效应产生的中尺度环流对局地强对流天气有明显作用。 大别山区和皖南山系对江淮地区的暴雨和强对流天气的影响也早已为该地区预报员们所重视,通过雷达、天气图和云图资料分析认识到山区热力对流、长江穿谷流和大别山背风坡低压是江淮地区剧烈天气发生的重要因素。 为了比较深入地了解中尺度地形对强对流天气的影响,除了从实测资料进行细致分析外,有必要从更多还原

【Abstract】 In this paper a one-level complex terrain mesoscale model was used to diagnose numerically severe convection weather occurred in the Yangtze River valley area on 10 May 1989. The results show that dynamic and thermodynamic effects of the mesoscale topography play an important role in the course of heavy weather. It is especially noticeable that local circulations of mountain-valley or slope winds and lake-land breezes caused by different heating of terrain have key influence on occurrence, intensification and movement of severe convection storms.更多还原