Abstract: The structure of the profiles of wind velocity, temperature and humidity during the formation and dissipation of foggy periods in spring and winter are studied by using the observational data in atmospheric boundary layer obtained in the southern of Beijing in 1999. The relationship between the physical process of the formation and dissipation of the fog and the meteorological factors, such as maximum value of wind speed, PBL height, is pointed out. The physical process of the fog development affecting evolution process of atmospheric boundary layer is discussed. Thus, a physical background for improving the fog prediction accuracy and artificial dispersal is provided.

Key words: fog, nocturnal boundary layer, Southern Suburb of Beijing

摘要： 利用1999年北京南郊开展的大气边界层实验资料，对比分析了春冬两季雾天气过程中大气边界层风速、温度和湿度廓线结构及其伴随雾生消过程的演变规律，揭示了雾的生消与风速极值、夜间逆温层厚度等气象要素的关系规律，讨论了雾的生消对大气边界层演变过程的影响。结果可为提高雾天气预测和人工影响雾天气提供基础。

关键词: 雾, 夜间边界层, 北京南郊