气候变化领域集成服务门户(CCPortal): Investigation on the urban ambient isoprene and its oxidation processes

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DOI	10.1016/j.atmosenv.2021.118870
	Investigation on the urban ambient isoprene and its oxidation processes
	Gu C.; Wang S.; Zhu J.; Wu S.; Duan Y.; Gao S.; Zhou B.
发表日期	2021
ISSN	1352-2310
英文摘要	As a characteristic biogenic volatile organic compound, isoprene is directly emitted by plants and participates in the atmospheric chemical process promptly. In virtue of differential optical absorption spectroscopy (DOAS) technique, isoprene was measured from spring to autumn of 2018 in urban area of Shanghai, China. The concentration of isoprene reached its peak in July with monthly average exceeded 0.3 ppbv. Besides, a distinct diurnal variation was observed and peaked around 13:00, up to 0.6 ppbv. The observed isoprene was found closely related to meteorological factors, and showed a good correlation with emission active factor γ calculated by temperature and radiation (R2 = 0.87), indicating that the urban isoprene emission is mainly emitted from biogenic sources and regulated by temperature and radiation. According to the proportional relationship between isoprene and its major intermediate oxidation products, it suggested that vast majority of daytime methyl vinyl ketone (MVK) and methacrolein (MACR) were derived from the oxidation of isoprene. To further understand the oxidation processes of isoprene, six cases covering different atmospheric conditions were selected to simulate atmospheric radicals relied on the box model. The daily peak concentration of simulated ·OH and NO3 ranged from 5.98 × 106 to 1.19 × 107 molecule cm−3 and 2.35 × 108 to 1.49 × 109 molecule cm−3, presenting a medium-to-high level of atmospheric oxidation capacity. And oxidants of ·OH, O3 and NO3 shared 66–95%, 1–4% and 3–30% of isoprene oxidation, respectively. The comparison of estimated initial and measured isoprene concentration implied that at least half of the isoprene was oxidized between emission and measurement. The short daytime atmospheric lifetime (0.4–1.1 h) also suggested the high reactivity of isoprene. This study indicates that the urban ambient isoprene is fast oxidized and fully involved in the atmospheric oxidation processes, presenting some subtle differences under different air pollution conditions. © 2021 Elsevier Ltd
关键词	Atmospheric chemistry Box model DOAS Isoprene NO3 ·OH
语种	英语
scopus关键词	Absorption spectroscopy; Atmospheric chemistry; Ketones; Light absorption; Molecules; Oxidation; Reaction intermediates; Volatile organic compounds; Ambients; Biogenic volatile organic compounds; Box models; Chemical process; Differential optical absorption spectroscopy; Diurnal variation; Meteorological factors; Oxidation process; Urban areas; ·OH; Isoprene
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248782
作者单位	Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention LAP3, Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China; Institute of Eco-Chongming IEC, No.20 Cuiniao Road, Shanghai, 202162, China; State Ecologic Environmental Scientific Observation and Research Station at Dianshan Lake, Shanghai Environmental Monitoring Center, Shanghai, 200235, China; School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China; Zhuhai Fudan Innovation Institute, Zhuhai, 519000, China
推荐引用方式 GB/T 7714	Gu C.,Wang S.,Zhu J.,et al. Investigation on the urban ambient isoprene and its oxidation processes[J],2021.
APA	Gu C..,Wang S..,Zhu J..,Wu S..,Duan Y..,...&Zhou B..(2021).Investigation on the urban ambient isoprene and its oxidation processes.ATMOSPHERIC ENVIRONMENT.
MLA	Gu C.,et al."Investigation on the urban ambient isoprene and its oxidation processes".ATMOSPHERIC ENVIRONMENT (2021).