Articles | Volume 18, issue 19
Atmos. Chem. Phys., 18, 14539–14553, 2018
https://doi.org/10.5194/acp-18-14539-2018
Atmos. Chem. Phys., 18, 14539–14553, 2018
https://doi.org/10.5194/acp-18-14539-2018
Research article
11 Oct 2018
Research article | 11 Oct 2018

Heterogeneous OH oxidation of secondary brown carbon aerosol

Elijah G. Schnitzler and Jonathan P. D. Abbatt

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Cited articles

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Anastasio, C., Faust, B. C., and Rao, C. J.: Aromatic carbonyl compounds as aqueous-phase photochemical sources of hydrogen peroxide in acidic sulfate aerosols, fogs, and clouds. 1. Non-Phenolic methoxybenzaldehydes and methoxyacetophenones with reductants (phenols), Environ. Sci. Technol., 31, 218–232, https://doi.org/10.1021/es960359g, 1997. 
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Brown carbon (BrC) has significant but poorly constrained effects on climate. In this work, we investigate the effects of the OH radical on optical properties of secondary BrC in a series of smog chamber experiments. At high relative humidity (RH), we find that the evolution of the particles is complex, exhibiting rapid absorption enhancement followed by slow bleaching. At low RH, bleaching does not occur. These results further our understanding of the highly variable evolution of ambient BrC.
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