用统计学原理对泰安市所辖的5个气象观测站1971～2009年的大雾资料进行分析,得出时间分布特征:全市大雾主要出现在每年1、11和12月,平均雾日分别为2.2、2.9和3.0 d;空间分布特征:新泰大雾极差和标准差均最大,分别为57和15 d;肥城最小,分别为23和5 d.全市年最多雾日142 d,最少26 d,分别出现在1982年和1995年.一元线性回归法得出全市大雾日数呈减少趋势,气候变化率为8.7 d/10 a.%The dense fog data of meteorological station in Tai'an City from 1971 to 2009 were analyzed using statistics principle. The time distribution characteristics showed that dense fog in the whole city mainly appeared in January, November and December, and the average fog days were 2.2, 2.9 and 3.0 d. The space distribution characteristics were as follows: the maximum range and standard deviation of dense fog in Xintai County were 57 and 15 d, respectively, but those were 23 and 5 d in Feicheng County. The maximum and minimum dense fog days were 142 and 26 during 1982 and 1995, respectively. Simple liner regression results showed that dense fog gradually decrease year by year.The climate rate of change is 8.7 d/10 a.
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