云南高原楚雄市城市雾变化的气候特征分析

The characteristic analysis of urban fog in Chuxiong,Yunnan

本文在利用气象资料,对楚雄市近年来雾的资料进行处理,全面分析了楚雄市雾的日变化特征、月变化特征、年际变化特征及雾的影响,最后得出楚雄市雾的日变化一般在下半夜到清晨日出前后形成,生成高峰期07∶00～08∶00时,雾消散是日出后的08∶00～10∶00时;冬季大雾持续时间最长,夏季持续时间最短;楚雄市每个季节都有雾形成,1月到9月的月际变化呈"U"型特征,冬季(11—12月)发生的频率最高,夏季雾日数最少;楚雄市近10年来,雾日数最多年份是2008年,最少年份是2009年。雾使楚雄市水平能见度降低,并给楚雄市居民身体健康、交通和农业生产带来一定影响和危害。

On the base of meteorological data of urban fogs about Chuxiong from 2001 to 2005, this paper analyzes the daily, monthly and interannual variation characteristics of foggy weather. Resuits indicates that the fogs occurred generally at seven to eight o＇clock in early morning before sun- rise, and dissipated most likely at eight to ten o＇clock after sunrise. There was an increasing annual tendency in foggy days and a U -shaped monthly variation feature with the maximum in winter and minimum in summer. The fog lowers the horizontal visibility and harms agricultural production, transportation industry and citizen health.