济南市一次持续大雾过程分析  

Analysis of a sustained heavy fog event in Jinan

作　　者：尹承美[1] 刘爱梅[1] 胡鹏[1] 杨芙蓉[1] 周春珍[1] 

机构地区：[1]山东省济南市气象局,济南250002

出　　处：《气象科学》2008年第B12期37-40,共4页Journal of the Meteorological Sciences

摘　　要：利用常规气象观测资料对2007年12月20—23日济南市一次持续大雾天气过程的大尺度天气背景、地面气压场、温度对数压力图以及单站气象要素进行了分析,结果表明:雾是在稳定的大气层结下出现的天气现象,根据大气稳定层结的状况及变化,可以判断大雾天气的有无及生消时间;近地面逆温和低空逆温同时存在,表明大气层结非常稳定,近地面逆温有利于近地面层水汽积累,低空逆温使近地面层水汽不易扩散而聚集,有利于近地面层维持潮湿,持续几天出现大雾;连续几天大气层结都处于稳定状态,地面风力很小,这些都限制了近地面层的水汽向外耗散,底层相对湿度较大,为大雾的形成提供了充沛的水汽条件。A sustained fog event occurred in Jinan on 20--23 Dec. is analyzed by using routine observation data. The results show that fog is weather phenomenon that happens in stable atmosphere. The duration of the fog and its occurrence and dissipation can be determined by the variation of atmospheric stratification, the inversion which exists near the surface and at the low level indicates that the atmosphere is very stable. The inversion near the surface is conducive to the accumulation of the water vapor and the low level inversion hinders the water vapor from diffusing aloft. The wind in the boundary layer is light. So the saturated air is kept near the surface. These conditions sustained several days, so did the heavy fog.

关 键 词：持续大雾 逆温层 物理量 水汽 

分 类 号：P458.12[天文地球—大气科学及气象学]