芜湖市两次不同等级污染天气边界层风场特征对比研究  

Comparative Analysis onBoundary Layer Wind Characteristics of Two DifferentLevels Pollution Eventsin Wuhu City

作　　者：付伟 杨琼琼 邹莹瑾 Fu Wei;Yang Qiongqiong;Zou Yingjin(Wuhu Meteorological Bureau,Wuhu 241000,China;Wuwei Meteorological Bureau,Wuwei 238300,China)

机构地区：[1]芜湖市气象局,安徽芜湖241000 [2]无为市气象局,安徽无为238300

出　　处：《环境科学与管理》2024年第8期118-123,共6页Environmental Science and Management

基　　金：安徽省自然科学基金资助项目(1308085MD55);安徽省气象局预报员专项项目(kY202005)。

摘　　要：利用芜湖市边界层风廓线雷达和PM_(2.5)浓度数据,对两次污染天气过程的边界层风场特征进行了对比分析,结果表明:有明显传输污染时,PM_(2.5)浓度增长和消散快,极值高;本地PM_(2.5)累积为主时,污染持续时间长,极值低。边界层900米以下:上游高污染方向来风,小风速,下沉气流,弱垂直风切变,小C_(n)^(2)值,均对近地面污染的发展和维持有明显的有利影响。同时,低压倒槽控制阶段,500 m以下风速大,风场辐合强,且当风场辐合时300 m以下又有弱上升气流时,地面PM_(2.5)浓度较高。Used the data of boundary layer wind profile radar and PM_(2.5)concentration in Wuhu City,the boundary layer wind field characteristics of twopollution eventswere comparative analyzed.The results showed that:when there was obvious transmission pollution,the concentration of pollutants increased and dissipated quickly,with high extreme values.When local pollutants accumulated mainly,the time of duration of pollutants was long,and the extreme values were low.Below 900 meters of the boundary layer,wind from upstream high pollution directions,low wind speeds,sinking airflow,weak vertical wind shear,and small C_(n)^(2) values all had a significant beneficial impact on the development and maintenance of near surface pollution.At the same time,during the low-pressure trough control stage and below 500 meters,when the wind speed was high and the wind field converges strongly,and there was weak upwelling below 300 meters when the wind field converges,the concentration of ground pollutants is higher.

关 键 词：污染天气 边界层风廓线雷达 边界层风场 对比分析 

分 类 号：X513[环境科学与工程—环境工程]