2022年夏季广州市一次较长时间O_(3)污染的特征及机理分析  

Characteristics and mechanism of a long-lasting O_(3) pollution episode in the summer of 2022 in Guangzhou

作　　者：黄继章[1] 高健[2] 何钰清 高锐 裴成磊 宋伟 李磊 张金谱 刘南希 葛澳琪 余美芳 郭昊 叶子铭[1] HUANG Jizhang;GAO Jian;HE Yuqing;GAO Rui;PEI Chenglei;SONG Wei;LI Lei;ZHANG Jinpu;LIU Nanxi;GE Aoqi;YU Meifang;GUO Hao;YE Ziming(Guangzhou Research Institute of Environment Protection Co.,Ltd.,Guangzhou 510620;Chinese Research Academy of Environmental Sciences,Beijing 100012;Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center,Guangzhou 510006;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510630;School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519082)

机构地区：[1]广州市环境保护科学研究院有限公司,广州510620 [2]中国环境科学研究院,北京100012 [3]广东省广州生态环境监测中心站,广州510006 [4]中国科学院广州地球化学研究所,广州510630 [5]中山大学大气科学学院,珠海519082

出　　处：《环境科学学报》2024年第3期268-277,共10页Acta Scientiae Circumstantiae

摘　　要：2022年夏季广州市经历了一次持续时间较长的臭氧污染过程(7月22日—8月1日).针对此次典型污染事件,本文利用大气常规污染物和挥发性有机物(VOCs)组分数据,以及逐小时气象数据、欧洲中心第5代大气再分析资料(ERA5)等气象数据,对本次污染过程的来源及成因进行了解析,进而研究了天气系统、气象要素及区域传输过程对本次臭氧污染事件的影响.结果表明:在污染期间烷烃和芳香烃对VOCs浓度的贡献最大,工业源及溶剂挥发排放源是造成广州市中心城区污染的重要原因;此外,本次污染过程中广州长时间处于副热带高压控制的下沉气流区,由此产生的局地高温低湿、强辐射等气象条件为臭氧的生成、累积及其污染的持续创造了条件;广州市臭氧分布不仅受本地源的影响,还受区域传输影响;不利气象条件下需要建立区域联防联控机制以减少污染.A long-lasting ozone pollution episode occured in summer(July 22 to August 1)of 2022 in Guangzhou.The sources and causes of this event,the impacts on ozone concentration of weather systems related with meteorological componets and the transport process are investigated in this paper,using the observations including general atmospheric pollutants and the volatile organic compounds(VOCs)composition data,hourly meteorological data,ERA5 reanalysis data,etc.The results show that alkanes and aromatic hydrocarbons are the most significant contributors to VOCs concentration during the polluted area,suggesting that industrial sources and solvent volatilization are important reasons for the pollution in the central urban area of Guangzhou.In addition,during this pollution process,Guangzhou was in a downdraft area controlled by subtropical high pressure for a long time.The related local meteorological conditions,such as high temperature and low humidity,strong radiation,promot the generation,accumulation,and continuance of ozone pollution.Furthermore,the distribution of ozone in Guangzhou is not only influenced by local sources,but also by regional transport.Therefore,it is necessary to establish a regional joint prevention and control mechanism to reduce ozone pollution of Guangzhou.

关 键 词：广州 臭氧污染过程 区域传输 

分 类 号：X51[环境科学与工程—环境工程] X16