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本文利用常规天气图、探空图和三维中尺度模式,对大连机场2011年6月29日到7月3日出现的连续4天的大雾低云天气进行分析,发现此次大雾低云过程发生同副热带高压的位置和强度变化密不可分:副热带高压中高层的下沉逆温对大雾低云天气的低层稳定层的产生和维持起到重要作用;同时它的西进北抬和东撤南退直接导致大连机场上游天气系统三次槽线东移,进而影响本场。近地面层的水汽辐合和弱冷暖气流交汇为大雾低云天气得以维持提供良好的水汽条件。
In this paper, we use the conventional weather map, sounding map and three-dimensional mesoscale model to analyze the 4-day foggy and low-cloud weather in Dalian Airport from June 29 to July 3, 2011, The process is closely related to the change of position and intensity of the subtropical high: subsidence inversion temperature of middle and high subtropical high plays an important role in the production and maintenance of low-level stable layer in low foggy and low cloud weather; at the same time, The withdrawal of Nanzhan directly led to the eastward movement of the third trough of the upper reaches of the Dalian Airport weather system, which in turn affected the field. Convergence of water vapor near the ground floor and weak cold and warm air flow confluence for the fog to maintain a low cloud to provide good water vapor conditions.