Articles | Volume 19, issue 9
Atmos. Chem. Phys., 19, 6579–6594, 2019
Atmos. Chem. Phys., 19, 6579–6594, 2019

Research article 17 May 2019

Research article | 17 May 2019

Photooxidants from brown carbon and other chromophores in illuminated particle extracts

Richie Kaur et al.

Data sets

UV-visible absorption coefficients normalized to DOC of aqueous extracts of wintertime PM collected in Davis, CA, USA R. Kaur, J. R. Labins, S. S. Helbock, W. Jiang, K. Bein, Q. Zhang, and C. Anastasio

Short summary
We measured hydroxyl radical (OH), singlet oxygen (1O2*), and organic triplets (3C*) in illuminated aqueous particle extracts. After measuring the impact of dilution on oxidant concentrations, we extrapolated our results to predict them in ambient particles – 1O2* and 3C* concentrations appear to be greatly enhanced, while OH appears largely unchanged. Two of these oxidants (1O2*, 3C*) are not yet included in atmospheric models, and our results make it possible to include them in the future.
Final-revised paper