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DOI	10.5194/acp-22-13783-2022
	Not all types of secondary organic aerosol mix: two phases observed when mixing different secondary organic aerosol types
	Mahrt, Fabian; Peng, Long; Zaks, Julia; Huang, Yuanzhou; Ohno, Paul E.; Smith, Natalie R.; Gregson, Florence K. A.; Qin, Yiming; Faiola, Celia L.; Martin, Scot T.; Nizkorodov, Sergey A.; Ammann, Markus; Bertram, Allan K.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13783
结束页码	13796
卷号	22 期号:20 页码:14
英文摘要	Secondary organic aerosol (SOA) constitutes a large fraction of atmospheric aerosol. To assess its impacts on climate and air pollution, knowledge of the number of phases in internal mixtures of different SOA types is required. Atmospheric models often assume that different SOA types form a single phase when mixed. Here, we present visual observations of the number of phases formed after mixing different anthropogenic and biogenic SOA types. Mixing SOA types generated in environmental chambers with oxygen-to-carbon (O/C) ratios between 0.34 and 1.05, we found 6 out of 15 mixtures of two SOA types to result in two phase particles. We demonstrate that the number of phases depends on the difference in the average O/C ratio between the two SOA types (Delta(O/C)). Using a threshold Delta(O/C) of 0.47, we can predict the phase behavior of over 90 % of our mixtures, with one- and two-phase particles predicted for Delta(O/C)<0.47 and Delta(O/C) >= 0.47, respectively. This threshold Delta O/C value provides a simple parameter to predict whether mixtures of fresh and aged SOA form one- or two-phase particles in the atmosphere. In addition, we show that phase-separated SOA particles form when mixtures of volatile organic compounds emitted from real trees are oxidized.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000877143600001
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/273512
作者单位	University of British Columbia; Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; Jinan University; Harvard University; Harvard University; University of California System; University of California Irvine; Harvard University; University of California System; University of California Irvine; Auburn University System; Auburn University; Xinjiang University
推荐引用方式 GB/T 7714	Mahrt, Fabian,Peng, Long,Zaks, Julia,et al. Not all types of secondary organic aerosol mix: two phases observed when mixing different secondary organic aerosol types[J],2022,22(20):14.
APA	Mahrt, Fabian.,Peng, Long.,Zaks, Julia.,Huang, Yuanzhou.,Ohno, Paul E..,...&Bertram, Allan K..(2022).Not all types of secondary organic aerosol mix: two phases observed when mixing different secondary organic aerosol types.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),14.
MLA	Mahrt, Fabian,et al."Not all types of secondary organic aerosol mix: two phases observed when mixing different secondary organic aerosol types".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):14.