伊宁市夏季大气臭氧生成机制及减排策略  

Photochemical Mechanism and Control Strategy Optimization for Summertime Ozone Pollution in Yining City

作　　者：王文婷 谷超 李丽明 李新琪 郑镇森 耿春梅[2] 王晓丽[1] 杨文[2] WANG Wen-ting;GU Chao;LI Li-ming;LI Xin-qi;ZHENG Zhen-sen;GENG Cun-mei;WANG Xiao-li;YANG Wen(College of Environmental Science&Safety Engineering,Tianjin University of Technology,Tianjin 300384,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Ecological Environment Monitoring Centre of Xinjiang Uygur Autonomous Region,Urumqi 830011,China)

机构地区：[1]天津理工大学环境科学与安全工程学院,天津300384 [2]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [3]新疆维吾尔自治区生态环境监测总站,乌鲁木齐830011

出　　处：《环境科学》2024年第2期668-677,共10页Environmental Science

基　　金：大气重污染成因与治理攻关项目(DQGG202137,DQGG202119)。

摘　　要：为探究我国西北城市地区臭氧(O_(3))生成机制及减排策略,2021年夏季在伊宁市开展环境大气加强观测,基于0-D盒子模型(采用MCMv3.3.1化学机制)分析伊宁市大气O_(3)生成机制并初步探究大气O_(3)生成敏感性.结果表明:①由O_(3)生成潜势(OFP)、·OH反应速率(k·OH)和相对增量反应活性(RIR)这3个指标共同分析可知,烯烃、含氧挥发性有机物(OVOCs)和芳香烃是影响O_(3)生成的关键人为源挥发性有机物(AVOC)组分,且生物源挥发性有机物(BVOC)对O_(3)的生成贡献也不容忽视.基于RIR分析发现优控VOCs物种主要为乙醛、乙烯和丙烯等;②由盒子模型模拟可知,伊宁市O_(3)受到本地光化学生成和区域输出作用共同影响,且HO_(2)·+NO和·OH+NO_(2)反应途径分别对本地O_(3)光化学生成和去除贡献最大;③基于RIR(NO_(x))/RIR(AVOC)和EKMA共同表明,伊宁市夏季O_(3)生成主要处于过渡区且靠近VOCs控制区.不同削减情景模拟表明,AVOC和NO_(x)协同减排能有效降低当地O_(3)体积分数,其中AVOC减排效果更为明显.研究结果可为西北区域类似城市大气O_(3)污染管控提供支持.To explore the formation mechanism of the ozone(O_(3))and emission reduction strategy in a northwestern city,an extensive field campaign was conducted in summertime in 2021 in Yining City,in which the 0-D box model incorporating the latest explicit chemical mechanism(MCMv3.3.1)was applied for the first time to quantify the O_(3)-NO_(x)-VOCs sensitivity and formulate a precise O_(3) control strategy in this city.The results showed that:①the three indicators[i.e.,O_(3) formation potential(OFP),·OH reaction rate(k·OH),and relative incremental reactivity(RIR)]jointly indicated that alkenes,oxygenated volatile organic compounds(OVOCs),and aromatics were the highest contributors among anthropogenic volatile organic compounds(AVOC)to O_(3) formation,and the contribution of biogenic volatile organic compounds(BVOC)also could not be ignored.Additionally,the results based on RIR calculation implied that that the acetaldehyde,ethylene,and propylene were the most sensitive individual VOCs species in Yining City.②The in-situ photochemical O_(3) variations were primarily influenced by the local photochemical production and export process horizontally to downwind areas or vertically to the upper layer,and the reaction pathways of HO_(2)·+NO and·OH+NO_(2) contributed the most to the gross O_(x) photochemical production(60%)and photochemical destruction production(53%),respectively.Hence,the reduction in local emissions for O_(3) precursors was more essential to alleviate O_(3) pollution in this city.③The outcome based on RIR(NO_(x))/RIR(AVOC)and EKMA jointly suggested that the photochemical regime in this city can be considered a transitional regime that was also nearly a VOCs-limited regime.Detailed mechanism modeling based on multiple scenarios further suggested that the NO_(x) and VOCs synergic emission reduction strategies was helpful to alleviate O_(3) pollution.These results are useful to provide policy-related guidance for other cities facing similar O_(3) pollution in northwest China.

关 键 词：臭氧(O_(3)) 0-D盒子模型 MCMv3.3.1化学机制 O_(3)生成敏感性 减排情景模拟 

分 类 号：X515[环境科学与工程—环境工程]