Such results are gotten: (1) Due to the unique topography the wind of Beijing area during the day time is southern anabatic wind and in the night is northern katabatic wind in summer.

• 研究结果表明:(1)北京区域夏季边界层风场受西北特殊地形的影响,夜间低层大气流场常表现为由北向南的下坡风,白天逐渐转为由南往北的上坡风。