重庆市冬季雾生消的物理特征

The Physical Process of Chongqing Fog's Genesis and Dissipation in Winter

2001年12月份在重庆市郊及市区进行了雾的综合外场观测,其间12月4日和29日各出现了一次雾过程。通过对这两次雾过程的分析,揭示了重庆市冬季雾生消的宏微观物理过程。同时通过和10a前重庆雾的比较,得到了重庆城市发展后雾生消的一些新的特征,并分析了其原因。和10a前相比,重庆市区冬季雾维持时间缩短,强度减弱,雾体爆发性发展的时间延后;雾滴数密度可比10a前增大一个数量级,雾滴尺度约为10a前的一半。重庆城市的扩大,湿度的减小和气溶胶粒子浓度的增加是重庆雾产生这种变化的根本原因。

A comprehensive field observation of fog in both the center and suburb of Chongqing is carried on in December 2001,there were two processes of fog in 4th and 29th during that period.By analyzing the two processes of fog,the macro- and micro-physical characters of Chongqing fog in winter are revealed,and the new characters of Chongqing fog after the development of the city are obtained by comparing with the Chongqing fog ten years ago.At last the reason for such change of Chongqing fog is also analyzed.In comparison with the Chongqing fog ten years ago,the duration of fog is shortened,the intensity weakened,and the erupting development postponed;the density of fogdrops is about ten times and the size of fogdrops is one half.The expansion of the city,the reduction of humidity,and the increase of aerosal particle concentration are responsible for such changes of Chongqing fog.