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- W4308168546 endingPage "13796" @default.
- W4308168546 startingPage "13783" @default.
- W4308168546 abstract "Abstract. 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 (Δ(O/C)). Using a threshold Δ(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 Δ(O/C)<0.47 and Δ(O/C)≥0.47, respectively. This threshold ΔO/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." @default.
- W4308168546 created "2022-11-08" @default.
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- W4308168546 date "2022-11-01" @default.
- W4308168546 modified "2023-10-16" @default.
- W4308168546 title "Not all types of secondary organic aerosol mix: two phases observed when mixing different secondary organic aerosol types" @default.
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- W4308168546 doi "https://doi.org/10.5194/acp-22-13783-2022" @default.