气候变化领域集成服务门户(CCPortal): Direct contribution of ammonia to <i>α</i>-pinene secondary organic aerosol formation

CCPortal

DOI	10.5194/acp-20-14393-2020
	Direct contribution of ammonia to α-pinene secondary organic aerosol formation
	Hao L.; Kari E.; Leskinen A.; Worsnop D.R.; Virtanen A.
发表日期	2020
ISSN	1680-7316
起始页码	14393
结束页码	14405
卷号	20 期号:22
英文摘要	Ammonia (NH3), a gaseous compound ubiquitously present in the atmosphere, is involved in the formation of secondary organic aerosol (SOA), but the exact mechanism is still not well known. This study presents the results of SOA experiments from the photooxidation of-pinene in the presence of NH3 in the reaction chamber. SOA was formed in in nucleation experiments and in seeded experiments with ammonium sulfate particles as seeds. The chemical composition and time series of compounds in the gas and particle phase were characterized by an online highresolution time-of-flight proton-Transfer-reaction mass spectrometer (HR-ToF-PTRMS) and a high-resolution time-offlight aerosol mass spectrometer (HR-ToF-AMS), respectively. Our results show that the mass concentration of ammonium (NHC 4 ) was still rising even after the mass concentration of the organic component started to decrease due to aerosol wall deposition and evaporation, implying the continuous new formation of particle-phase ammonium in the process. Stoichiometric neutralization analysis of aerosol indicates that organic acids have a central role in the formation of particle-phase ammonium. Our measurements show a good correlation between the gas-phase organic mono-and dicarboxylic acids formed in the photooxidation of-pinene and the ammonium in the particle phase, thus highlighting the contribution of gas-phase organic acids to the ammonium formation. The work shows that the gas-phase organic acids contribute to the SOA formation by forming organic ammonium salts through acid base reaction. The changes in aerosol mass, particle size and chemical composition resulting from the NH3 SOA interaction can potentially alter the aerosol direct and indirect forcing and therefore alter its impact on climate change. © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	aerosol composition; aerosol formation; ammonium; chemical composition; concentration (composition); mass spectrometry; spatial resolution; stoichiometry; trace element
语种	英语
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/168946
作者单位	Department of Applied Physics, University of Eastern Finland, Kuopio, Finland; Finnish Meteorological Institute, Kuopio, Finland; Aerodyne Research Inc, Billerica, MA 08121-3976, United States; Neste Oyj, Porvoo, Finland
推荐引用方式 GB/T 7714	Hao L.,Kari E.,Leskinen A.,et al. Direct contribution of ammonia to α-pinene secondary organic aerosol formation[J],2020,20(22).
APA	Hao L.,Kari E.,Leskinen A.,Worsnop D.R.,&Virtanen A..(2020).Direct contribution of ammonia to α-pinene secondary organic aerosol formation.Atmospheric Chemistry and Physics,20(22).
MLA	Hao L.,et al."Direct contribution of ammonia to α-pinene secondary organic aerosol formation".Atmospheric Chemistry and Physics 20.22(2020).