气候变化领域集成服务门户(CCPortal): Estimation of secondary organic aerosol viscosity from explicit modeling of gas-phase oxidation of isoprene and α-pinene

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DOI	10.5194/acp-21-10199-2021
	Estimation of secondary organic aerosol viscosity from explicit modeling of gas-phase oxidation of isoprene and α-pinene
	Galeazzo T.; Valorso R.; Li Y.; Camredon M.; Aumont B.; Shiraiwa M.
发表日期	2021
ISSN	1680-7316
起始页码	10199
结束页码	10213
卷号	21 期号:13
英文摘要	Secondary organic aerosols (SOA) are major components of atmospheric fine particulate matter, affecting climate and air quality. Mounting evidence exists that SOA can adopt glassy and viscous semisolid states, impacting formation and partitioning of SOA. In this study, we apply the GECKO-A (Generator of Explicit Chemistry and Kinetics of Organics in the Atmosphere) model to conduct explicit chemical modeling of isoprene photooxidation and α-pinene ozonolysis and their subsequent SOA formation. The detailed gas-phase chemical schemes from GECKO-A are implemented into a box model and coupled to our recently developed glass transition temperature parameterizations, allowing us to predict SOA viscosity. The effects of chemical composition, relative humidity, mass loadings and mass accommodation on particle viscosity are investigated in comparison with measurements of SOA viscosity. The simulated viscosity of isoprene SOA agrees well with viscosity measurements as a function of relative humidity, while the model underestimates viscosity of α-pinene SOA by a few orders of magnitude. This difference may be due to missing processes in the model, including autoxidation and particle-phase reactions, leading to the formation of high-molar-mass compounds that would increase particle viscosity. Additional simulations imply that kinetic limitations of bulk diffusion and reduction in mass accommodation coefficient may play a role in enhancing particle viscosity by suppressing condensation of semi-volatile compounds. The developed model is a useful tool for analysis and investigation of the interplay among gas-phase reactions, particle chemical composition and SOA phase state. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol; atmospheric modeling; isoprene; particulate matter; photooxidation; viscosity
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/246753
作者单位	Department of Chemistry, University of California Irvine, Irvine, CA 92625, United States; Univ Paris Est Creteil, Université de Paris, Cnrs, Lisa, Créteil, 94010, France
推荐引用方式 GB/T 7714	Galeazzo T.,Valorso R.,Li Y.,et al. Estimation of secondary organic aerosol viscosity from explicit modeling of gas-phase oxidation of isoprene and α-pinene[J],2021,21(13).
APA	Galeazzo T.,Valorso R.,Li Y.,Camredon M.,Aumont B.,&Shiraiwa M..(2021).Estimation of secondary organic aerosol viscosity from explicit modeling of gas-phase oxidation of isoprene and α-pinene.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(13).
MLA	Galeazzo T.,et al."Estimation of secondary organic aerosol viscosity from explicit modeling of gas-phase oxidation of isoprene and α-pinene".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.13(2021).