期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 22, 期 20, 页码 13783-13796出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-22-13783-2022
关键词
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资金
- European Union [890200]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN/04441-2016]
- National Natural Science Foundation of China [42105102]
- Harvard University Center for the Environment through the Environmental Fellows program
- Environmental Chemical Sciences of the Division of Chemistry of the US National Science Foundation (NSF) [ECS-2003368]
- National Science Foundation, Division of Atmospheric and Geospace Sciences [2035125]
- US NSF [AGS-1853639]
- Marie Curie Actions (MSCA) [890200] Funding Source: Marie Curie Actions (MSCA)
- Directorate For Geosciences [2035125] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences [2035125] Funding Source: National Science Foundation
This study investigates the number of phases formed after mixing different types of secondary organic aerosol (SOA) types. The research finds that the number of phases depends on the difference in the average oxygen-to-carbon ratio (O/C) between the two SOA types. By observing the particles formed from mixing specific O/C ratios of SOA types, it is possible to predict whether the mixture will form one-phase or two-phase particles. Additionally, phase-separated SOA particles can form when volatile organic compounds emitted from real trees are oxidized.
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.
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