THE PHYSICAL STRUCTURE OF THE WINTER FOG IN CHONGQING METROPOLITAN AREA AND ITS FORMATION PROCESS

Chongqing is a very famous foggy metropolitan in China.The Chongqing Fog Experiment Group carried out comprehensive experiments on a large and extensive scale in the Chongqing urban area from 15 December 1989 to 15 January 1990.And several items were further observed from 7 December 1990 to 7 January 1991.Based on the analysis of the observational data,some important characteristics of the Chongqing winter fog and the boundary layer structure have been revealed.It is found that such factors as topography,mountain wind,rivers,the urban heat island and air pollution,all contribute to the formation of the Chongqing fog in addition to the radiation conditions.