气候变化领域集成服务门户(CCPortal): Modeling Ammonia and Its Uptake by Secondary Organic Aerosol Over China

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DOI	10.1029/2020JD034109
	Modeling Ammonia and Its Uptake by Secondary Organic Aerosol Over China
	Wu K.; Zhu S.; Liu Y.; Wang H.; Yang X.; Liu L.; Dabdub D.; Cappa C.D.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	Atmospheric ammonia (NH3) can affect nitrogen deposition, particle acidity, and gas-particle partitioning. Although the inorganic chemistry of NH3 in fine particulate (PM2.5) formation are well-constrained, the understanding of interactions between NH3 and secondary organic aerosol (SOA) are rather insufficient until recently. Laboratory studies indicate that NH3 molecule can react with SOA then forms nitrogen-containing organic compounds (NOCs), which can further react to form heterocyclic organic compounds. In this study, we use a modified version of the CMAQ model to simulate the potential importance of the SOA-ammonia uptake mechanism on air quality over China in summer and winter 2017, considering a range of assumed NH3 uptake coefficients (10−3–10−5). Our results show that uptake of NH3 by SOA leads to a decrease in gas-phase NH3 mixing ratio, by as much as 27.5% and 19.0% for the highest uptake coefficient scenario (10−3) in summer and winter, respectively. The largest reduction of ammonia occurs over the Sichuan Basin and the North China Plain. The reduction of gas-phase NH3 engenders a decrease of ammonium nitrate, by up to 30%, but has little impact on the ammonium sulfate concentration. Uptake of NH3 does not significantly affect SOA concentrations owing to overall moderate changes in aerosol acidity, and thus small effects on SOA formation from isoprene. Altogether, NH3 uptake led to a reduction in the average PM2.5 concentration up to 8.9% and 8.7% for the highest uptake coefficient (10−3) in summer and winter, respectively. These results highlight the need for better constraints on the NH3-SOA interactions. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	ammonia uptake; CMAQ; heterogeneous chemistry; particle matter; SOA
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185333
作者单位	Department of Land, Air, and Water Resources, University of California, Davis, CA, United States; Advanced Power and Energy Program, University of California, Irvine, CA, United States; Department of Mechanical and Aerospace Engineering, Computational Environmental Sciences Laboratory, University of California, Irvine, CA, United States; School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, China; Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; School of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu, China; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China; Department of Civil and Environmental Engineering, University ...
推荐引用方式 GB/T 7714	Wu K.,Zhu S.,Liu Y.,et al. Modeling Ammonia and Its Uptake by Secondary Organic Aerosol Over China[J],2021,126(7).
APA	Wu K..,Zhu S..,Liu Y..,Wang H..,Yang X..,...&Cappa C.D..(2021).Modeling Ammonia and Its Uptake by Secondary Organic Aerosol Over China.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Wu K.,et al."Modeling Ammonia and Its Uptake by Secondary Organic Aerosol Over China".Journal of Geophysical Research: Atmospheres 126.7(2021).