2008年11月初大雾过程边界问题分析

Analysis of the Boundary of the Fog Field in the Early November,2008

利用常规观测资料和NCEP1°×1°再分析资料对2008年11月初发生在中国东部的一场大雾的边缘区域进行诊断分析,结果表明:在雾区的边缘,能否成雾的因素除湿度、风速和逆温等基本条件外,近地面散度场与垂直风速对雾的形成也有相当重要的作用,其中低层辐合高层辐散区的边缘和雾区的边缘有较好的对应关系,950hPa上方的下沉速度能够阻止水汽的向上扩散,而越往上越大的上升速度意味着雾区的消散。

Based on the data from conventional observations and NCEP reanalysis,a synoptic analysis was carried out for the boundary of a rare large fog process occurring in the early November,2008.The result shows that,at the boundary of the fog field,besides such basic conditions as temperature inversion,air humidity and wind speed,the divergence field and vertical wind speed are related to the fog formation,and the boundaries of low-level convergence and high-level divergence are also related to the fog boundary.