气候变化领域集成服务门户(CCPortal): Coexistence of three liquid phases in individual atmospheric aerosol particles

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DOI	10.1073/pnas.2102512118
	Coexistence of three liquid phases in individual atmospheric aerosol particles
	Huang Y.; Mahrt F.; Xu S.; Shiraiwa M.; Zuend A.; Bertram A.K.
发表日期	2021
ISSN	00278424
卷号	118 期号:16
英文摘要	Individual atmospheric particles can contain mixtures of primary organic aerosol (POA), secondary organic aerosol (SOA), and secondary inorganic aerosol (SIA). To predict the role of such complex multicomponent particles in air quality and climate, information on the number and types of phases present in the particles is needed. However, the phase behavior of such particles has not been studied in the laboratory, and as a result, remains poorly constrained. Here, we show that POA+SOA+SIA particles can contain three distinct liquid phases: a low-polarity organic-rich phase, a higher-polarity organic-rich phase, and an aqueous inorganic-rich phase. Based on our results, when the elemental oxygen-to-carbon (O:C) ratio of the SOA is less than 0.8, three liquid phases can coexist within the same particle over a wide relative humidity range. In contrast, when the O:C ratio of the SOA is greater than 0.8, three phases will not form. We also demonstrate, using thermodynamic and kinetic modeling, that the presence of three liquid phases in such particles impacts their equilibration timescale with the surrounding gas phase. Three phases will likely also impact their ability to act as nuclei for liquid cloud droplets, the reactivity of these particles, and the mechanism of SOA formation and growth in the atmosphere. These observations provide fundamental information necessary for improved predictions of air quality and aerosol indirect effects on climate. © This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).
英文关键词	Aerosol particles; Air quality; Atmospheric chemistry; Climate; Phase behavior
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179802
作者单位	Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada; Laboratory of Environmental Chemistry, Paul Scherrer Institute, Villigen, 5232, Switzerland; Department of Chemistry, University of California, Irvine, CA 92697-2025, United States; Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC H3A 0B9, Canada
推荐引用方式 GB/T 7714	Huang Y.,Mahrt F.,Xu S.,et al. Coexistence of three liquid phases in individual atmospheric aerosol particles[J],2021,118(16).
APA	Huang Y.,Mahrt F.,Xu S.,Shiraiwa M.,Zuend A.,&Bertram A.K..(2021).Coexistence of three liquid phases in individual atmospheric aerosol particles.Proceedings of the National Academy of Sciences of the United States of America,118(16).
MLA	Huang Y.,et al."Coexistence of three liquid phases in individual atmospheric aerosol particles".Proceedings of the National Academy of Sciences of the United States of America 118.16(2021).