【摘要】 本文分析了同时观测的气溶胶化学元素浓度和各种气象资料。证明城市空气污染与风向、风速、降水、大气稳定度和低层逆温等气象要素关系十分密切。在冬春季节,冷锋过境后偏北大风期间,通常是北京地区空气清洁期;而冷锋过境后,高空为缓慢移动的反气旋控制,300米以下昼夜持续的低层逆温和不利于水平输送的弱辐合型地面风场同时存在期间,是北京地区形成强污染期的一类典型的天气条件。更多还原

【Abstract】 Ill this paper, observations of elemental concentration of the atmospheric aerosol and meteorological conditions are analyzed. It is confirmed that the urban air pollution has a close relation with wind direction and velocity, rainfall, stability, and inversion near the ground. Usually, during the period with strong north wind after passing of a cold front, the clear period will exist in Beijing. On the other hand, if the following typical conditions, a slow moving anticyclone at the upper atmosphere, continuous inversion below 300 m and wind field near the surface unfavorable for horizontal transfer, exist simultaneously, then there will be the period of heavy pollution in Beijing.更多还原