Influence of Relative Humidity on the Heterogeneous Oxidation of Secondary Organic Aerosol

This dataset contains data from figures and model code used to generate figures in the paper \"Influence of Relative Humidity on the Heterogeneous Oxidation of Secondary Organic Aerosol\" by Li et al., published in Atmospheric Chemistry and Physics. A description of the work follows below. See read me files for details. Secondary organic aerosol (SOA) is a complex mixture of hundreds of semi‑volatile to extremely low‑volatility organic compounds that are chemically processed in the atmosphere, including via heterogeneous oxidation by gas‑phase radicals. Relative humidity (RH) has a substantial impact on particle phase, which can affect how SOA evolves in the atmosphere. In this study, SOA from dark a-pinene ozonolysis is heterogeneously aged by OH radicals in a flowtube at low and high RH. At high RH (RH = 89%) there is substantial loss of particle volume (~60%) at an equivalent atmospheric OH exposure of 3 weeks. In contrast, at low RH (RH = 25%) there is little mass loss (<20%) at...