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DOI	10.5194/acp-21-11545-2021
	Temperature and volatile organic compound concentrations as controlling factors for chemical composition of α-pinene-derived secondary organic aerosol
	Jensen L.N.; Canagaratna M.R.; Kristensen K.; Quéléver L.L.J.; Rosati B.; Teiwes R.; Glasius M.; Pedersen H.B.; Ehn M.; Bilde M.
发表日期	2021
ISSN	1680-7316
起始页码	11545
结束页码	11562
卷号	21 期号:15
英文摘要	This work investigates the individual and combined effects of temperature and volatile organic compound precursor concentrations on the chemical composition of particles formed in the dark ozonolysis of-pinene. All experiments were conducted in a 5m3 Teflon chamber at an initial ozone concentration of 100 ppb and initial-pinene concentrations of 10 and 50 ppb, respectively; at constant temperatures of 20, 0, or-15 C; and at changing temperatures (ramps) from-15 to 20 and from 20 to-15 C. The chemical composition of the particles was probed using a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS). A four-factor solution of a positive matrix factorization (PMF) analysis of the combined HR-ToF-AMS data is presented. The PMF analysis and the elemental composition analysis of individual experiments show that secondary organic aerosol particles with the highest oxidation level are formed from the lowest initial-pinene concentration (10 ppb) and at the highest temperature (20 C). A higher initial-pinene concentration (50 ppb) and/or lower temperature (0 or-15 C) results in a lower oxidation level of the molecules contained in the particles. With respect to the carbon oxidation state, particles formed at 0 C are more comparable to particles formed at-15 C than to those formed at 20 C. A remarkable observation is that changes in temperature during particle formation result in only minor changes in the elemental composition of the particles. Thus, the temperature at which aerosol particle formation is induced seems to be a critical parameter for the particle elemental composition. Comparison of the HR-ToF-AMS-derived estimates of the content of organic acids in the particles based on m=z 44 in the mass spectra show good agreement with results from off-line molecular analysis of particle filter samples collected from the same experiments. Higher temperatures are associated with a decrease in the absolute mass concentrations of organic acids (R-COOH) and organic acid functionalities (-COOH), while the organic acid functionalities account for an increasing fraction of the measured particle mass. © 2021 Copernicus GmbH. All rights reserved.
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/246687
作者单位	Department of Chemistry, Aarhus University, Aarhus C, Denmark; Aerodyne Research Inc., Billerica, MA, United States; Department of Biological and Chemical Engineering, Aarhus University, Aarhus C, Denmark; Institute for Atmospheric and Earth System Research-INAR/Physics, University of Helsinki, Helsinki, Finland; Department of Physics and Astronomy, Aarhus University, Aarhus C, Denmark
推荐引用方式 GB/T 7714	Jensen L.N.,Canagaratna M.R.,Kristensen K.,et al. Temperature and volatile organic compound concentrations as controlling factors for chemical composition of α-pinene-derived secondary organic aerosol[J],2021,21(15).
APA	Jensen L.N..,Canagaratna M.R..,Kristensen K..,Quéléver L.L.J..,Rosati B..,...&Bilde M..(2021).Temperature and volatile organic compound concentrations as controlling factors for chemical composition of α-pinene-derived secondary organic aerosol.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Jensen L.N.,et al."Temperature and volatile organic compound concentrations as controlling factors for chemical composition of α-pinene-derived secondary organic aerosol".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).