阜新市彰武县大雾特征与地形的关系

利用实时资料和统计方法,结合彰武县特殊地形,探讨了彰武县大雾的气候特点及其与地形的关系,并对2009年12月10日彰武的一次大雾天气过程进行分析。结果表明,偏东气流进入彰武西部后由于上坡作用,有利于大雾的生成和加强;当彰武出现大雾时,沈阳吹偏东风的频率为58.0%,而阜新县出现大雾时,偏东风仅为33.8%,可见偏东气流对彰武比对阜新县大雾的生成作用明显,这也是彰武出现大雾次数比阜新县出现大雾次数多的主要原因;500hPa的偏西气流、850hPa高压脊或脊后暖舌以及中低层的暖湿气流、地面为均压场是大雾形成的有利环流条件。

Relation between the Special Geography and the Heavy Fog in Zhangwu County in Fuxin City

By the real-time data and statistics,as well as the features of Zhangwu topography,the relation between the special geography and the heavy fog in Zhangwu was discussed,and a fog process on December 10,2009 was analyzed.The results showed that it is helpful for the formation and strengthening of the heavy fog after the air by east entering the western part of Zhangwu because of the uphill.When there is heavy fog in Zhangwu,the frequency of easterly wind would be 58% in Shenyang,while the fog appears in Fuxin the frequency would only be 33.8%.It can be seen that the effect of the formation of fog by easterly airstream is more obvious on Fuxin County than on Zhangwu,which is also the main reason why the heavy fog occurs more frequently in Zhangwu than in Fuxin.There are many favorable circulation conditions for the formation of fog,such as the westerly flow of 500 hPa,the pressure ridge of 850 hPa or the warm tongue of back ridge,the warm air from the middle and lower level,and taking the ground as the equal press,etc.