气候变化领域集成服务门户(CCPortal): Long-term observational constraints of organic aerosol dependence on inorganic species in the southeast US

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DOI	10.5194/acp-20-13091-2020
	Long-term observational constraints of organic aerosol dependence on inorganic species in the southeast US
	Zheng Y.; Thornton J.A.; Lee Ng N.; Cao H.; Henze D.K.; McDuffie E.E.; Hu W.; Jimenez J.L.; Marais E.A.; Edgerton E.; Mao J.
发表日期	2020
ISSN	1680-7316
起始页码	13091
结束页码	13107
卷号	20 期号:21
英文摘要	Organic aerosol (OA), with a large biogenic fraction in the summertime southeast US, adversely impacts air quality and human health. Stringent air quality controls have recently reduced anthropogenic pollutants including sulfate, whose impact on OA remains unclear. Three filter measurement networks provide long-term constraints on the sensitivity of OA to changes in inorganic species, including sulfate and ammonia. The 2000-2013 summertime OA decreases by 1.7% yr-1-1.9% yr-1 with little month-to-month variability, while sulfate declines rapidly with significant monthly difference in the early 2000s. In contrast, modeled OA from a chemical-transport model (GEOS-Chem) decreases by 4.9% yr-1 with much larger monthly variability, largely due to the predominant role of acid-catalyzed reactive uptake of epoxydiols (IEPOX) onto sulfate. The overestimated modeled OA dependence on sulfate can be improved by implementing a coating effect and assuming constant aerosol acidity, suggesting the needs to revisit IEPOX reactive uptake in current models. Our work highlights the importance of secondary OA formation pathways that are weakly dependent on inorganic aerosol in a region that is heavily influenced by both biogenic and anthropogenic emissions. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol; air quality; ammonia; anthropogenic source; atmospheric modeling; inorganic compound; long-term change; sulfate; United States
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/247406
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Chemistry and Biochemistry, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, United States; Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States; Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada; Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, United States; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sc...
推荐引用方式 GB/T 7714	Zheng Y.,Thornton J.A.,Lee Ng N.,et al. Long-term observational constraints of organic aerosol dependence on inorganic species in the southeast US[J],2020,20(21).
APA	Zheng Y..,Thornton J.A..,Lee Ng N..,Cao H..,Henze D.K..,...&Mao J..(2020).Long-term observational constraints of organic aerosol dependence on inorganic species in the southeast US.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21).
MLA	Zheng Y.,et al."Long-term observational constraints of organic aerosol dependence on inorganic species in the southeast US".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020).