Abstract：By using the data of meteorological elements, climatological statistics and routine synoptic charts, the climatic characteristics of dense fog and synoptic situation in Jingdezhen City are analyzed based on the method of statistics and feature extraction. The results show that there are often dense fog in winter, the highest frequency of occurrence is center on November to March during 5-7 BJT in a day. The heavy fog occurs during after midnight to before dawn, disappearing at 8-9 BJT. The minimum of the visibility is smaller, the duration of the fog is longer. The surface synoptic situation mainly shows weak isolate high pressure and cold air diffusing, occupying 70% of the total. The fog produced by weak isolate high pressure shows isolate large high-pressure ridge in the east of China and the south of the Yangtze River. In the northeast of Jiangxi Province where west-northwest air current is in 500hpa layer. The high pressure is controlled in the middle-low level layer. The fog produced by cold air diffusing appears in 1 030hpa strong high pressure center along the west of Hetao area. The northeast of Jiangxi Province is located at the bottom of high pressure where isoheights are intensive. So the dense fog appears under the effect of weak high-pressure ridge, cold air and radiation cooling.
2013, Vol. 30 
