一次准静止锋影响下的昆明长水机场大雾过程分析

Analysis of a Heavy Fog in Kunming-Changshui Airport Under the Influence of a Quasi Stationary Front

本文利用常规高空探测资料和长水机场自动探测资料,分析了 2013年12月26-31日大雾天气过程出现的天气背景和气象要素特征,以找出昆明准静止锋影响下长水机场大雾天气的特征.分析表明,此次大雾过程出现了 5 次大雾天气,在冷空气西进加强、维持、减弱摆动阶段均可产生,其中冷空气维持阶段大雾持续时间最长.大雾时长水机场位于锋后或锋面附近冷空气区内.大雾发生时昆明上空多有双层逆温出现,逆温层底高度低,湿层较深厚,最大相对湿度在92%以上;大雾发生时长水机场为东北风,风速2-5m/s,风向转为西南风,能见度将很快转好.

Based on the routine upper air sounding data and AWOS data,synoptic pattern and the meteorological character analysis is applied on a 26 ~ 31 heavy fog. The results show that heavy fog occurs during the cold air strengthens,statics,and weakens when Changshui airport located in the cold area of the front. When the fog sustained,double inversion layers and deep high reality humidity layer can be find in the upper air,and the base of inversion layer is low. The results also show that the surface wind direction is north-east,and the wind speed is 2 ~ 5m/s when the fog lasted,the fog will get clear when the surface wind direction turns from north-east to south-west.