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Sci Total Environ

Title:		Significance of carbonyl compounds to photochemical ozone formation in a coastal city (Shantou) in eastern China
Author(s):		Shen H; Liu Y; Zhao M; Li J; Zhang Y; Yang J; Jiang Y; Chen T; Chen M; Huang X; Li C; Guo D; Sun X; Xue L; Wang W;
Address:		"Environment Research Institute, Shandong University, Qingdao, Shandong 266237, China. Shantou Environmental Protection Monitoring Station, Shantou 515041, China. Electronic address: lijuan10jli4@163.com. Shantou Environmental Protection Monitoring Station, Shantou 515041, 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. Electronic address: xuelikun@sdu.edu.cn"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20201224
Issue:
Page Number:		144031 -
DOI:		10.1016/j.scitotenv.2020.144031
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"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"
Keywords:		Carbonyl compounds Chemical box model Ozone formation Volatile organic compounds;
Notes:		"PubMed-not-MEDLINEShen, Hengqing Liu, Yuhong Zhao, Min Li, Juan Zhang, Yingnan Yang, Juan Jiang, Ying Chen, Tianshu Chen, Miao Huang, Xianbing Li, Chengliu Guo, Danling Sun, Xiaoyan Xue, Likun Wang, Wenxing eng Netherlands 2021/01/03 Sci Total Environ. 2021 Apr 10; 764:144031. doi: 10.1016/j.scitotenv.2020.144031. Epub 2020 Dec 24"