气候变化领域集成服务门户(CCPortal): Explicit modeling of background HCHO formation in southern China

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DOI	10.1016/j.atmosres.2020.104941
	Explicit modeling of background HCHO formation in southern China
	Yang X.; Zhang G.; Sun Y.; Zhu L.; Wei X.; Li Z.; Zhong X.
发表日期	2020
ISSN	0169-8095
卷号	240
英文摘要	Formaldehyde (HCHO) is an abundant carbonyls and plays important roles in ozone formation and atmospheric oxidizing capacity. To better understand the formation mechanisms of HCHO and its effects on ozone formation, carbonyl compounds were measured at a regional background site of Hong Kong from 20 August to 22 December 2012. Among the total observed carbonyls, Formaldehyde (HCHO, 2.00 ± 1.04 ppbv) presents the most abundant concentration and plays the most important role in OH removal with LOH value of 0.47 s−1. To further dissect the secondary formation mechanism of HCHO at Hok Tsui, detailed modeling analyses were conducted by the OBM-AOCP model for two cases with different meteorological conditions. The result shows that HCHO production was dominated by the reactions of CH3O + O2, and RO + O2 (first-generation precursor of RO was Alkenes). The HCHO destruction pathways during two cases were governed by the reactions with OH and photolysis. The net generation rate of HCHO was controlled by meteorological conditions with alkenes (mainly ethylene (C2H4) and propylene (C3H6)) being the dominant parent hydrocarbons of HCHO. Overall, this study provides some new insights into the formation mechanisms of HCHO, especially their parent hydrocarbon species, underlines the important role of carbonyls in ozone pollution in Hok Tsui. Reducing the emissions of alkenes would be an effective way to mitigate photochemical pollution in the background atmosphere of China. © 2020 Elsevier B.V.
关键词	Ethylene Formaldehyde Ozone Photolysis Carbonyls Formation mechanism HCHO Hydrocarbon species Meteorological condition OBM-AOCP Photochemical pollution Secondary formation Air pollution atmospheric modeling background level concentration (composition)formaldehyde formation mechanism ozone photolysis Cape d'Aguilar China Hong Kong Hong Kong Island
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132484
推荐引用方式 GB/T 7714	Yang X.,Zhang G.,Sun Y.,et al. Explicit modeling of background HCHO formation in southern China[J]. Atmospheric Research,2020,240.
APA	Yang X..,Zhang G..,Sun Y..,Zhu L..,Wei X..,...&Zhong X..(2020).Explicit modeling of background HCHO formation in southern China.,240.
MLA	Yang X.,et al."Explicit modeling of background HCHO formation in southern China".240(2020).