中文关键词挥发性有机物(VOCs)复合污染来源二次生成关键活性组分 英文关键词volatile organic compounds (VOCs)complex pollutionsourcessecondary formationkey reactive species

作者	单位	E-mail
王倩	上海市环境科学研究院, 国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233	wangqian0606@126.com

中文摘要 本研究基于2019年5月上海市臭氧（O₃）和细颗粒物（PM_2.5）复合污染期间获得的城区大气中挥发性有机物（VOCs）的观测结果，分析了大气中VOCs的污染特征及其与二次生成的关系，同时解析了气团的潜在来源及VOCs的人为源贡献.结果表明，2019年5月上海市O₃与PM_2.5共出现4次污染过程，在平均气温约26℃，相对湿度约40%左右的气象条件下，发生了PM_2.5和O₃同步超标的复合污染现象.VOCs光化学消耗程度与O₃最大净增长量呈现明显的正相关，二次有机气溶胶生成潜势（SOA_P）与PM_2.5日均值呈现明显的正相关.VOCs物种中对臭氧生成有重要贡献的关键活性组分为：间/对-二甲苯、乙烯、甲苯、丙烯和邻-二甲苯等，在臭氧污染日，乙烯和丙烯等关键活性组分的臭氧生成潜势（OFP）百分比贡献进一步加强；对二次有机气溶胶（SOA）有重要贡献的关键活性组分为：甲苯、间/对二甲苯、乙苯、邻-二甲苯和1，2，3-三甲苯，在PM_2.5污染日，甲苯、乙苯、邻-二甲苯和1，3，5-三甲苯等关键活性组分的SOA_P的百分比贡献会进一步加强. 英文摘要 In the urban area of Shanghai during the complex pollution episode, ozone and PM_2.5 were continuously measured from May 1 to May 28, 2019. The characterization of volatile organic compounds (VOCs) and their relationship with secondary formation were studied. The results show that in May 2019, there were four different ozone and PM_2.5 pollution processes in Shanghai. The combined pollution of PM_2.5 and ozone that occurred under the meteorological conditions of average temperature of approximately 26℃ and relative humidity of approximately 40% was analyzed. The photochemical consumption of VOCs was significantly positively correlated with the maximum net growth of O₃ and there was a significant positive correlation between SOA_P and PM_2.5. The key reactive species of VOCs that significantly contribute to ozone generation were m,p-xylene, ethylene, toluene, propylene, and o-xylene. The key reactive species that significantly contribute to secondary organic aerosols (SOA) were toluene, m,p-xylene, ethylbenzene, o-xylene, and 1,2,3-trimethylbenzene.

PDF全文下载地址:

https://www.hjkx.ac.cn/hjkx/ch/reader/create_pdf.aspx?file_no=20200606&flag=1&journal_id=hjkx&year_id=2020