南宁典型空气污染和清洁过程的近地层流场分析

Laminar Flow Field Analysis of Typical Air Pollution and Clean Process in Nanning

利用广西地面自动气象站资料及南宁空气污染物浓度等资料,通过EOF和矢量和等方法,对选出的典型空气污染过程和清洁过程的近地层流场进行分析得出:典型污染过程大尺度系统较弱,受局地中小尺度环流系统影响,污染物局限在当地,出现严重的污染天气;而清洁过程大气对流活动较活跃,主要受大尺度环流系统影响;污染过程风矢量和较小,扩散条件较差;清洁过程风矢量和较大,利于污染物扩散。

Based on the data of ground automatic weather stations in Guangxi and data air pollutant concentration in Nanning, the typical air pollution process and cleaning process elected in laminar flow field were analyzed with the methods of EOF and vector： typical pollution process large scale system is weak, contaminants confined to local and appeared severe pollution of the weather affected by the local small and medium scale circulation system; Clean process air convection was mainly affected by the large-scale circulation system and more active; Wind vector and small pollution process, diffusion conditions is poor; A wind vector and cleaning process favors the pollutant diffusion.