河北省浓雾、强浓雾的气候特征及年代际变化

Characteristics and inter-decadal variations of dense fog and strong fog in Hebei Province

利用1965年～2006年河北省16个代表站的气象观测资料,采用EOF以及Mann-Kendall等统计方法,详细分析了浓雾、强浓雾的时空特征、日变化规律及年代际变化。结果发现:浓雾、强浓雾年均日数分别为5d、1d,平原站浓雾、强浓雾日数明显较多,秋、冬季是它们的多发季节,12月是多发月;浓雾、强浓雾发生的峰值时间都在晚上20点后到次日早晨7点之间,消散的主要时间均在8点到12点之间,而且均表现为3～6h的出现频率最高;二者呈现增加的年代际变化趋势。

Based on the observational data from 16 meteorological stations in Hebei Province during 1965-2006,temporal and spatial feature,day variational law and inter-decadal variations of dense fog and strong fog were detailedly analyzed by using EOF and Mann-Kendall methods.Results showed that annual days of dense fog and strong fog are 5d and 1d respectively,their days in plain are more,The season of multi-dense fog and multi-strong fog are in autumn and winter,their frequency in december is the highest.The starting time of dense fog and strong fog occuring is from 20：00 to 7：00 of the next day.The ending time is from 8：00 to 12：00.3-6h of the dense fog and strong fog are the most.Inter-decadal variations for them showed upward trend.