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DOI	10.5194/acp-23-1209-2023
	Modeling daytime and nighttime secondary organic aerosol formation via multiphase reactions of biogenic hydrocarbons
	Han, Sanghee; Jang, Myoseon
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	1209
结束页码	1226
卷号	23 期号:2 页码:18
英文摘要	The daytime oxidation of biogenic hydrocarbons is attributed to both OH radicals and O-3, while nighttime chemistry is dominated by the reaction with O-3 and NO3 radicals. Here, daytime and nighttime patterns of secondary organic aerosol (SOA) originating from biogenic hydrocarbons were predicted under varying environmental conditions (temperature, humidity, sunlight intensity, NOx levels, and seed conditions) by using the UNIfied Partitioning Aerosol phase Reaction (UNIPAR) model, which comprises multiphase gas-particle partitioning and in-particle chemistry. The products originating from the atmospheric oxidation of three different hydrocarbons (isoprene, alpha-pinene, and beta-caryophyllene) were predicted by using extended semi-explicit mechanisms for four major oxidants (OH, O-3, NO3, and O(P-3)) during day and night. The resulting oxygenated products were then classified into volatility-reactivity-based lumping species. The stoichiometric coefficients associated with lumping species were dynamically constructed under varying NOx levels, and they were applied to the UNIPAR SOA model. The predictability of the model was demonstrated by simulating chamber-generated SOA data under varying environments. For daytime SOA formation, both isoprene and alpha-pinene were dominated by the OH-radical-initiated oxidation showing a gradual increase in SOA yields with decreasing NOx levels. The nighttime isoprene SOA formation was processed mainly by the NO3-driven oxidation, yielding higher SOA mass than daytime at higher NOx level (isoprene / NOx < 5 ppb C ppb(-1)). At a given amount of ozone, the oxidation to produce the nighttime alpha-pinene SOA gradually transited from the NO3-initiated reaction to ozonolysis as NOx levels decreased. Nighttime alpha-pinene SOA yields were also significantly higher than daytime SOA yields, although the nighttime alpha-pinene SOA yields gradually decreased with decreasing NOx levels. beta-Caryophyllene, which rapidly produced SOA with high yields, showed a relatively small variation in SOA yields from changes in environmental conditions (i.e., NOx levels, seed conditions, and sunlight intensity), and its SOA formation was mainly attributed to ozonolysis day and night. The daytime SOA formation was generally more sensitive to the aqueous reactions than the nighttime SOA because the daytime chemistry produced more highly oxidized multifunctional products. The simulation of alpha-pinene SOA in the presence of gasoline fuel, which can compete with alpha-pinene for the reaction with OH radicals in typical urban air, suggested more growth of alpha-pinene SOA by the enhanced ozonolysis path. We concluded that the oxidation of the biogenic hydrocarbon with O-3 or NO3 radicals is a source of the production of a sizable amount of nocturnal SOA, despite the low emission at night.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000919523600001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273477
作者单位	State University System of Florida; University of Florida
推荐引用方式 GB/T 7714	Han, Sanghee,Jang, Myoseon. Modeling daytime and nighttime secondary organic aerosol formation via multiphase reactions of biogenic hydrocarbons[J],2023,23(2):18.
APA	Han, Sanghee,&Jang, Myoseon.(2023).Modeling daytime and nighttime secondary organic aerosol formation via multiphase reactions of biogenic hydrocarbons.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),18.
MLA	Han, Sanghee,et al."Modeling daytime and nighttime secondary organic aerosol formation via multiphase reactions of biogenic hydrocarbons".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):18.