| 华北工业城市夏季大气臭氧生成机制及减排策略 |
| 摘要点击 2099 全文点击 1652 投稿时间：2022-10-19 修订日期：2022-12-04 |
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| 中文关键词 臭氧(O3) 盒子模型 MCMv3.3.1化学机制 O3-NOx-VOC敏感性 臭氧减排情景模拟 |
| 英文关键词 ozone(O3) 0-D box model MCMv3.3.1 mechanism O3-NOx-VOC sensitivity optimum O3 control scenario modelling |
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| 中文摘要 |
| 为了分析工业城市臭氧（O3）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O3前体物削减优化方案.结果表明：①O3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O3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O3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O3污染更为重要；③污染时期高浓度的·OH （10×106 cm-3）和HO2·（14×108 cm-3）引发局地瞬时O3生成速率高值（峰值36×10-9 h-1），HO2·+NO和·OH+NO2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O3生成控制分区更倾向于氮氧化物（NOx）控制区，基于不同排放情景的模拟结果进一步说明以NOx减排为重点的协同减排策略能够有效控制当地O3污染，该方法也可为我国其他城市O3精准防控提供借鉴. |
| 英文摘要 |
| To investigate the characteristics and formation mechanism of ozone (O3) pollution in an industrial city, an extensive one-month field campaign focusing on O3 and its precursors (e.g., volatile organic compounds[VOC] and nitrogen oxides[NOx]) 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, NOx, HONO, and PAN) as model contraints to explore the optimal reduction strategy for O3 and its precursors. The results showed that ① during high-O3 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). ② The in-situ O3 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 O3 pollution in this region. ③ During high-O3 episodes, high concentrations of ·OH (10×106 cm-3) and HO2· (14×108 cm-3) radical drove and generated a high O3 production rate (daytime peak value reached 36×10-9 h-1). The reaction pathways of HO2·+NO and ·OH+NO2 contributed the most to the in-situ gross Ox photochemical production (63%) and photochemical destruction (50%), respectively. ④ Compared to those during low-O3 episodes, the photochemical regimes during high-O3 episodes were more inclined to be considered as the NOx-limited regime. Detailed mechanism modeling based on multiple scenarios further suggested that the synergic emission reduction strategy of NOx and VOC, while focusing on NOx emission alleviation, would be practical options for controlling local O3 pollutions. This method could also provide policy-related guidance for the precise O3 pollution prevention and control in other industrialized Chinese cities. |
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