Seminar

Abstract

Although atmospheric gas-phase oxidation processes are relatively well understood, their condensed phase counterparts are poorly characterized. In particular, a number of processes occur that do not proceed in the gas phase and in other cases the rates of similar chemistry are accelerated. This seminar will present laboratory results from three case studies, moving from one system – bromide oxidation by ozone – for which we have separated the rates of both surface and bulk phase chemistry, to increasingly more complex, less well-characterized systems, in particular PAH oxidation by ozone and then SOA oxidation by OH. The SOA work will be given the most attention, given the recent observations in the atmosphere of highly oxygenated organic aerosol. The impact of oxidative aging on the CCN properties of SOA will be presented.