Articles | Volume 20, issue 16
Atmos. Chem. Phys., 20, 9581–9590, 2020
https://doi.org/10.5194/acp-20-9581-2020

Special issue: Simulation chambers as tools in atmospheric research (AMT/ACP/GMD...

Atmos. Chem. Phys., 20, 9581–9590, 2020
https://doi.org/10.5194/acp-20-9581-2020

Research article 17 Aug 2020

Research article | 17 Aug 2020

Glyoxal's impact on dry ammonium salts: fast and reversible surface aerosol browning

David O. De Haan et al.

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When exposed to glyoxal in chamber experiments, dry ammonium or methylammonium sulfate particles turn brown immediately and reversibly without increasing in size. Much less browning was observed on wet aerosol particles, and no browning was observed with sodium sulfate aerosol. While estimated dry aerosol light absorption caused by background glyoxal (70 ppt) is insignificant compared to that of secondary brown carbon overall, in polluted regions this process could be a source of brown carbon.
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