By using the data of fog days in the period of 1961-2010 in Jilin Province, the characteristics and changes of spatial and temporal distribution of fog days as well as reasons are analyzed. Results show that the spatial pattern of annual and seasonal fog days presents more in southeastern areas and less in western areas of Jilin Province. The seasonal characteristics appear more during Aug. to Sep., but less during Oct. to May. The inter-monthly variation of fog days in western and middle areas appears bimodal pattern, and that in southeast-ern and eastern areas appears unimodality. Fog usually begins at 21:00-09:00 LST and ends at 22:00-13:00 LST, with duration 0-6 h. In recent 50 years, the annual and four seasonal fog days of the province's average and all areas exhibited decreasing trends. The fog days appear obvious sudden change in 2000.The spatial dis-tribution of fog days have relations with altitude. The causes of fog days decreasing are that the"heat island ef-fect","dry island effect"and the increase of aerosol, and that the climate becaming warm and dry.
fogclimate characteristiccausewarm and dryJilin Province
NETL
NSTL
维普
万方数据
