选取合肥市近50年年平均大雾日数、近10年逐日大雾观测资料,分析了该市大雾时空特征；并利用ECMWF细网格预 报场资料对该市秋冬季发生的大雾过程进行预报释用。结果表明：合肥市大雾有缓慢的线性增加趋势,大雾异 常年占比20%；出雾时段91%在早晨04:00～10:00,辐射雾占比为94%; 11月、1月,大雾和浓雾天气出现频 数均最多;大雾天气冬半年多于夏半年,但12月份雾天反而较少;肥西观测站大雾和浓雾天气出现频数均最多; 温度、湿度、风速和云量等气象要素条件指标与辐射雾生成具有较好的对应关系。

The average annual number of fog days in the past 50 years, and the daily fog observations in the past 10 years in Hefei were selected to analyze the area fog spatial and temporal characteristics. Detailed grid, ECMWF data for interpretation and application of autumn and winter fog are used. The results showed that: Hefei fog appeared slowly linear increase, accounting for 20% fog abnormal years; 91% fog occurring time during the morning hours 04:00～10:00, radiation fog accounting for 94%. In November and January, fog and dense fog occured most frequently. Foggy days in winter are more than that in summer, but in December is less fog. Fog and dense fog in Feixi County stations occured most frequently. Temperature, humidity, wind speed, cloud cover and radiation fog has good correspondence.