银川一次连续大雾天气的观测与天气分析

Observation and weather analysis of a continuous fog weather in Yinchuan

对银川站2006年1月22—28日观测到的1次连续大雾天气过程,从地面观测资料特征、探空观测资料特征、天气形势特征及大雾的成因入手,进行分析和总结.结果表明,大雾天气过程产生在高空平直气流中的小波动影响,主要是由冷平流和辐射冷却使水汽在近地面层和低层聚集,近地面晴朗微风是大雾形成并维持的重要条件;各层地温高低排列的变化,对大雾过程的结束有提示作用.

A continuous fog weather observed from Jan. 22nd to 28th in Yinchuan Weather Station was analyzed and summarized in terms of the characteristics of field observation data and upper-air observation data as well as the characteristics of weather situation and cause formation of fog. The results showed that the fog weather process was produced by a small fluctuation influenced by the upper-air straight air current. It is formed by low-level accumulation of moisture made by the cooling of advection and radiation under the weather condition of ground clearness and breeze. Variety of ground temperature had hint effect on the ending of fog process.