华北工业城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 an Industrial City in the North China Plain

作　　者：郑镇森 窦建平 张国涛 李丽明 徐勃 杨文[1] 白志鹏[1] ZHENG Zhen-sen;DOU Jian-ping;ZHANG Guo-tao;LI Li-ming;XU Bo;YANG Wen;BAI Zhi-peng(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Zibo Ecological Environment Quality Control Service Center,Zibo 255030,China;Zibo Eco-Environmental Monitoring Center,Zibo 255000,China)

机构地区：[1]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 [2]淄博市生态环境质量控制服务中心,淄博255030 [3]山东省淄博生态环境监测中心,淄博255000

出　　处：《环境科学》2023年第4期1821-1829,共9页Environmental Science

基　　金：典型重工业城市大气有机气溶胶分子水平表征、来源解析及健康风险项目(G2021060002L);大气重污染成因与治理攻关项目(DQGG202119);淄博市生态环境局大气复合污染综合观测网络项目(SDG3703002020002000003)。

摘　　要：为了分析工业城市臭氧(O_(3))污染的特征及形成机制,2021年6月在华北平原淄博市开展了综合观测,利用盒子模型(基于MCMv3.3.1化学机制)探究O_(3)前体物削减优化方案.结果表明:(1)O_(3)污染时期伴随静稳、高温低湿和强辐射等气象条件,含氧挥发性有机物(OVOC)和烯烃等人为源挥发性有机物(AVOC)组分对O_(3)生成潜势(OFP)和_(·OH)反应速率(k_(·OH))贡献率最大;(2)模型研究发现O_(3)主要受本地光化学生成和以输出性为主的区域传输影响,本地污染管控对降低O_(3)污染更为重要;(3)污染时期高浓度的_(·OH)(10×10^(6)cm^(-3))和HO_(2)·(14×10^(8)cm^(-3))引发局地瞬时O_(3)生成速率高值(峰值36×10^(-9)h^(-1)),HO_(2)·+NO和_(·OH)+NO_(2)反应途径分别对本地Ox光化学生成(63%)和去除(50%)收支贡献最大;(4)相比于非污染时期,污染时期O_(3)生成控制分区更倾向于氮氧化物(NO_(x))控制区,基于不同排放情景的模拟结果进一步说明以NO_(x)减排为重点的协同减排策略能够有效控制当地O_(3)污染,该方法也可为我国其他城市O_(3)精准防控提供借鉴.To investigate the characteristics and formation mechanism of ozone(O_(3))pollution in an industrial city,an extensive one-month field campaign focusing on O_(3) and its precursors(e.g.,volatile organic compounds[VOC]and nitrogen oxides[NO_(x)])was conducted in Zibo City,a highly industrializd city in the North China Plain,in June 2021.The 0-D box model incorporating the latest explicit chemical mechanism(MCMv3.3.1)was applied using an observation dataset(e.g.,VOC,NO_(x),HONO,and PAN)as model contraints to explore the optimal reduction strategy for O_(3) and its precursors.The results showed that①during high-O_(3) episodes,stagnant weather conditions with high temperature and solar radiation as well as low relative humidity were observed,and oxygenated VOCs and alkenes from anthropogenic VOCs contributed the most to the total ozone formation potential and OH reactivity(k_(·OH)).②The in-situ O_(3) variation was primarily affected by local photochemical production and export process horizontal to downwind areas or vertical to the upper layer.The reduction in local emissions was essential to alleviate O_(3) pollution in this region.③During high-O_(3) episodes,high concentrations of_(·OH)(10×10^(6) cm^(-3))and HO_(2)·(14×10^(8) cm^(-3))radical drove and generated a high O_(3) production rate(daytime peak value reached 36×10^(-9)h^(-1)).The reaction pathways of HO_(2)·+NO and_(·OH)+NO_(2) contributed the most to the in-situ gross Ox photochemical production(63%)and photochemical destruction(50%),respectively.④Compared to those during low-O_(3) episodes,the photochemical regimes during high-O_(3) episodes were more inclined to be considered as the NO_(x)-limited regime.Detailed mechanism modeling based on multiple scenarios further suggested that the synergic emission reduction strategy of NO_(x) and VOC,while focusing on NO_(x) emission alleviation,would be practical options for controlling local O_(3) pollutions.This method could also provide policy-related guidance for the precise O_(3) pollution pre

关 键 词：臭氧(O_(3)) 盒子模型 MCMv3.3.1化学机制 O_(3)-NO_(x)-VOC敏感性 臭氧减排情景模拟 

分 类 号：X515[环境科学与工程—环境工程]