嘉兴市雾生消规律及气候特征

依据嘉兴市1961-2000年雾的资料进行气候分析,发现嘉兴市雾的出现频率东西部多、中间少,且有明显的年际变化,1977年以前雾日少,1977年以后雾日增多．月际变化呈“W”型和“V”型,春冬季雾最多,夏季最少．雾的日变化一般为下半夜到早晨形成,日出后2～3h内消散,61％为短雾．雾发生的天气形势归纳为四种天气类型。

The Climatic Characters of Occurrence and Dissipation of Fog in Jiaxing

Based on the data from 1961-2000, The climatic analysis of fog in Jia Xing shows that the fog occurred more frequently in eastern and western Jia Xing than in its middle regions, and it has obvious annual variation.The fog occurred frequently after 1977 than before 1977. The monthly variation of fog days usually appeared in the shape of "W" and "V". The fog occurred in spring and winter mostly and in summer least . Generally the fog formed at the latter half of the night and before dawn in its daily variation, and then it tends to dissipate within 2-3 hours after the sunrise. 61% of the fog is called short fog with duration less than 3 hours. The synoptic situations of fog occurring were classified into four patterns.