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首页> 外文期刊>Science of the total environment >Significance of carbonyl compounds to photochemical ozone formation in a coastal city (Shantou) in eastern China
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Significance of carbonyl compounds to photochemical ozone formation in a coastal city (Shantou) in eastern China

机译：羰基化合物在中国东部城市（汕头）中光化臭氧形成的意义

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摘要

Carbonyl compounds are ubiquitous in the troposphere, yet their contributions to ambient ozone (O_3) formation have rarely been quantified in China. To better understand their roles in O_3 pollution, a field campaign was conducted at an urban site of Shantou, a coastal city in eastern China, during 7th-29th October 2019. Seven carbonyls were quantified (average ± standard deviation: 14.42 ± 3.05 ppbv), among which formaldehyde (4.12 ± 1.02 ppbv), acetaldehyde (1.57 ± 0.30 ppbv), acetone (7.55 ± 2.10 ppbv), and methyl ethyl ketone (0.94 ± 0.28 ppbv) were the most abundant species. Relative incremental reactivity (RIR) analysis indicated that O_3 formation in Shantou was VOC-limited, specifically most sensitive to carbonyls, and formaldehyde showed the largest RIR values in terms of individual species. Budgets of O_3 and RO_x (OH, HO_2, and RO_2) radicals were elucidated with a chemical box model. Carbonyls played a vital role in both the primary formation and recycling of the RO_x; more than 80% of the primary source of HO_2 and RO_2 came from photolysis of formaldehyde and other oxygenated VOCs. Zero-out sensitivity studies showed that the seven measured carbonyls accounted for 37% of the peak net O_3 production rate, mainly by affecting the concentrations of HO_2 and RO_2. These results highlight the significance of carbonyls, especially formaldehyde, to photochemical O_3 formation, and carbonyls should be paid more attention to mitigate the worsening O_3 pollution in China.
机译：羰基化合物在对流层中普遍存在，但它们对环境臭氧（O_3）形成的贡献很少在中国量化。为了更好地了解他们在O_3污染中的角色，在2019年10月7日至29日，在中国东部沿海城市汕头市汕头市区进行了一个野外活动。量化了7个羰基（平均±标准差：14.42±3.05 ppbv） ，其中甲醛（4.12±1.02 ppbb），乙醛（1.57±0.30ppbv），丙酮（7.55±2.10ppbv）和甲基乙基酮（0.94±0.28 ppbv）是最丰富的物种。相对增量反应性（RIR）分析表明，汕头的O_3形成是VOC-LIMITED，对羰基特别敏感，甲醛在个体种类方面表现出最大的RIR值。用化学盒模型阐明了O_3和RO_X（OH，HO_2和RO_2）自由基的预算。羰基在RO_X的主要形成和再循环中起着重要作用;超过80％的HO_2和RO_2的主要来源来自甲醛和其他含氧VOC的光解。零升敏性研究表明，七个测量的羰基占净净o_3生产率的37％，主要是影响HO_2和RO_2的浓度。这些结果突出了羰基，尤其是甲醛，光化学o_3形成的重要性，并且应更加注重羰基，以减轻中国的恶化O_3污染。

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  • 来源
    《Science of the total environment》 |2021年第10期|144031.1-144031.10|共10页
  • 作者

    Hengqing Shen; Yuhong Liu; Min Zhao; Juan Li; Yingnan Zhang; Juan Yang; Ying Jiang; Tianshu Chen; Miao Chen; Xianbing Huang; Chengliu Li; Danling Guo; Xiaoyan Sun; Likun Xue; Wenxing Wang;

  • 作者单位

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Shantou Environmental Protection Monitoring Station Shantou 515041 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Shantou Environmental Protection Monitoring Station Shantou 515041 China;

    Shantou Environmental Protection Monitoring Station Shantou 515041 China;

    Shenzhen OnePoint Environmental Consultant Co. Ltd Shenzhen 518000 China;

    Shenzhen OnePoint Environmental Consultant Co. Ltd Shenzhen 518000 China;

    Jinan Environmental Monitoring Center Station Ji'nan Shandong 250014 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

    Environment Research Institute Shandong University Qingdao Shandong 266237 China;

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  • 正文语种 eng
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  • 关键词

    Carbonyl compounds; Ozone formation; Volatile organic compounds; Chemical box model;

    机译：羰基化合物;臭氧形成;挥发性有机化合物;化学盒模型;

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