1981—2011年长海县大雾变化特征分析

Analysis on Heavy Fog Change Characteristics in Changhai County from 1981 to 2011

利用1981—2011年长海县国家基准站逐月大雾日数统计资料,对大雾日数的年、季和月分布情况进行分析。结果表明,1981—2011年长海县大雾日数总体呈上升趋势,气候倾向率为9 d/10年。四季大雾日数占比由高到低依次为夏季、秋季、春季和冬季,四季大雾日数均呈上升的变化趋势,秋季的气候倾向率最大,春季和冬季最小。近31年长海县月大雾日数变化呈先增加后迅速减少的抛物线变化规律,大雾天气主要出现在5—7月,其间应加强相关的预警预报服务。

Based on statistical data of monthly heavy fog days in Changhai National Standard Station from 1981 to 2011,the annual,seasonal andmonthly heavy fog days change was analyzed. The results showed that,the change coefficient of annual heavy fog days in Changhai County from 1981 to2011 was 9 d per 10 years,which showed an upward trend in general. The heavy fog days in Changhai County mainly occurred in summer,follow byautumn and spring,and less likely occurred in winter. The change coefficient of seasonal heavy fog days showed an upward trend in all season,thechange coefficient of autumn was the largest and that of spring and winter was the lowest. Monthly heavy fog days in Changhai County were increasedfirst,and then decreased rapidly.The heavy fog days mainly occurred from May to July,so we should strengthen the relevant early warning andforecasting services in this period.