佛山地区一次重污染过程的气象影响因子研究  

Study on the Effects of Meteorological Factors of a Heavy Pollution Process in the City of Foshan

作　　者：陈辰 黄锦灿 陈慧娴 吴蒙 余乐福[1] 朱建军 范绍佳 嵇萍[4] 梁华玲[1] CHEN Chen;HUANG Jincan;CHEN Huixian;WU Meng;YU Lefu;ZHU Jianjun;FAN Shaojia;JI Ping;LIANG Hualing(Foshan Meteorological Bureau,Foshan 528000,China;Guangdong Ecological Meteorology Center,Guangzhou 510640,China;School of Atmospheric Science,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Environmental Monitoring Centre,Guangzhou 510308,China)

机构地区：[1]佛山市气象局,广东佛山528000 [2]广东省生态气象中心,广东广州510640 [3]中山大学大气科学学院,广东广州510275 [4]广东省环境监测中心,广东广州510308

出　　处：《环境科学与技术》2018年第11期65-71,共7页Environmental Science & Technology

基　　金：国家重点研发计划大气专项课题(2016YFC0203305);国家自然科学基金重点项目(41630422);国家自然科学基金(41475004)

摘　　要：2017年1月初佛山地区出现珠三角有AQI观测以来最严重的一次污染天气,该文利用风廓线雷达、激光雷达等多种观测资料对该过程的气象成因进行了深入研究。结果表明:PM_(2.5)是此次污染过程中最主要的首要污染物,小风、高湿的气象条件对此次污染的形成具有重要作用,当风速介于0.5~1.5 m/s之间、相对湿度>70%时,PM_(2.5)的浓度基本处于100μg/m3以上,空气质量明显较差;当湿度>90%时,PM_(2.5)>250μg/m3,污染严重;垂直风场小风层的存在、底层乃至整层的下沉气流、底层逆温等均阻碍了污染物的垂直扩散,促进了污染物的累积;地面气流的辐合,进一步加剧了污染的形成。A heavy polluted weather was observed in Foshan area in early January 2017, the pollution process was the worst one since the AQI was monitored in the Pearl River Delta. This paper made an in-depth study on the causes of meteorological factors of the pollution process by using various observational data such as wind profile radar and lidar. The results showed that PM2.5 is the most important pollutant in this pollution process. The weather conditions of small wind and high humidity played important roles in the formation of this pollution. When the wind speed was between 0.51.5 m/s and the relative humidity was greater than 70%, the air quality was became worse and the concentration of PM2.5 was basically up to 100 μg/m3;When the humidity was more than 90%, the concentration of PM2.5 was greater than 250 μg/m^3, the condition of pollution became serious. The existence of the small wind layer in the vertical wind field, the sinking airflow in the lower layer even the whole layer, the ground inversion all hindered the vertical diffusion of pollutants and promoted the accumulation of pollutants.Beside, the convergence of ground airflow further exacerbated the formation of pollution.

关 键 词：空气质量 气象条件 风廓线 激光雷达 佛山地区 

分 类 号：X51[环境科学与工程—环境工程]