山东省临沂市10月份雾的统计特征

利用2000~2009年临沂市10月份资料,对该地区10月份雾发生演变的气候学、天气学特征进行了统计分析。结果表明：该地区是雾多发区,雾在前一天20：00至当日08：00之间发生,65.8%的雾在09：00之前消散;雾日08：00风速97.4%小于2 m/s,静风最有可能出雾,其次是偏东风,再者是偏南风;雾日前一天20：00以东南东风频率最高,其次是东南风和静风;临沂雾的天气形势主要有5种,分别为锋前均压场型、弱高压或脊型、鞍形场型、高压入海型和倒槽（低压）前部型。

Statistical Features of Fog in Linyi of Shandong Province

By using the data in October of Linyi from 2000 to 2009,the climatology and weather characteristics of its fog evolution in October were statistically analyzed.Results indicated that,Linyi was a high-incidence area for fogs,which usually occurred from 20:00 to 08:00 in the next day,and there were 65.8% of the cases that the fog vanished before 9:00.In the fog days,about 97.4% of the wind speed at 08:00 was lower than 2m/s.The highest fog-occurring probability happened in calm wind days,then followed by the days with the leaning east wind and leaning south wind;at 20:00 the day before the foggy day,ESE winds occurred the most frequently,then followed by southeast wind and calm wind;there were five typical weather patterns in Linyi,including ahead front uniform pressure field,weak high pressure or ridge,saddle field,high pressure approaching to the sea and inverted through(low pressure) front.