Non-linear effects of secondary organic aerosol formation and properties in 
multi-precursor systems

Takeuchi, Masayuki; Berkemeier, Thomas; Eris, Gamze; Ng, Nga Lee

doi:10.1038/s41467-022-35546-1

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Non-linear effects of secondary organic aerosol formation and properties in multi-precursor systems

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Berkemeier, Thomas
Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Takeuchi, M., Berkemeier, T., Eris, G., & Ng, N. L. (2022). Non-linear effects of secondary organic aerosol formation and properties in multi-precursor systems. Nature Communications, 13: 7883. doi:10.1038/s41467-022-35546-1.

Cite as: https://hdl.handle.net/21.11116/0000-000D-6372-3

Abstract

Secondary organic aerosol (SOA) contributes significantly to ambient fine particulate matter that affects climate and human health. Monoterpenes represent an important class of biogenic volatile organic compounds (VOCs) and their oxidation by nitrate radicals poses a substantial source of SOA globally. Here, we investigate the formation and properties of SOA from nitrate radical oxidation of two common monoterpenes, α-pinene and limonene. When two monoterpenes are oxidized simultaneously, we observe a ~50% enhancement in the formation of SOA from α-pinene and a ~20% reduction in limonene SOA formation. The change in SOA yields is accompanied by pronounced changes in aerosol chemical composition and volatility. These non-linear effects are not observed in a sequential oxidation experiment. Our results highlight that unlike currently assumed in atmospheric models, the interaction of products formed from individual VOCs should be accounted for to accurately describe SOA formation and its climate and health impacts.