The effect of relative humidity (RH) on the composition and concentrations of gas-phase products and secondary organic aerosol (SOA) generated from the photooxidation of isoprene under high-NOx conditions was investigated. The yields of most gas-phase products were the same regardless of initial water vapor concentration with exception of hydroxyacetone and glycolaldehyde, which were considerably affected by RH. A significant change was observed in the SOA composition, with many unique condensed-phase products formed under humid (90% RH) vs. dry (
Published: July 18, 2011
Citation
Nguyen T.B., P.J. Roach, J. Laskin, A. Laskin, and S. Nizkorodov. 2011.Effect of Humidity on the Composition of Isoprene Photooxidation Secondary Organic Aerosol.Atmospheric Chemistry and Physics 11, no. 14:6931-3699.PNNL-SA-78897.doi:10.5194/acp-11-6931-2011