Articles | Volume 18, issue 19
https://doi.org/10.5194/acp-18-14585-2018
https://doi.org/10.5194/acp-18-14585-2018
Research article
 | 
11 Oct 2018
Research article |  | 11 Oct 2018

Influence of relative humidity on the heterogeneous oxidation of secondary organic aerosol

Ziyue Li, Katherine A. Smith, and Christopher D. Cappa

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Cited articles

Arangio, A. M., Slade, J. H., Berkemeier, T., Pöschl, U., Knopf, D. A., and Shiraiwa, M.: Multiphase chemical kinetics of OH radical uptake by molecular organic markers of biomass burning aerosols: humidity and temperature dependence, surface reaction, and bulk diffusion, J. Phys. Chem. A, 119, 4533–4544, https://doi.org/10.1021/jp510489z, 2015. 
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Cappa, C. D., Che, D. L., Kessler, S. H., Kroll, J. H., and Wilson, K. R.: Variations in organic aerosol optical and hygroscopic properties upon heterogeneous OH oxidation, J. Geophys. Res., 116, D15204, https://doi.org/10.1029/2011jd015918, 2011. 
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Short summary
We investigated the influence of relative humidity (RH) on the heterogeneous oxidation of secondary organic aerosol (SOA) particles by OH radicals. We observed significantly faster volume loss and compositional change of SOA at high RH, showing that viscosity differences determine compositional changes, but variability in either the uptake coefficient or the fragmentation probability are required to explain the difference in volume loss between low and high RH.
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