Multiphase organic photochemistry in the atmosphere

Speaker: Anne Monod, Aix-Marseille University, Laboratoire de Chimie de l'Environnement, CNRS, Marseille, France

When: Wednesday, April 10, 2013, 3:30 p.m. Mountain Time
Location: Room 2A305, DSRC (NOAA Building), 325 Broadway, Boulder
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Transport of reactive air masses to humid and/or wet areas is highly frequent in the atmosphere, making the study of aqueous phase processing particularly relevant. Although a limited number of studies have investigated the impact of liquid water on atmospheric (photo)chemical processes, recent results show the importance of such an approach to retrieve ambient observations. However, the complexity of such an approach induces high uncertainties, due to the necessity to investigate multiphase photochemistry, and due to the lack of a detailed understanding of the photochemistry occurring within the condensed phase. This presentation will give an overview of our past and recent laboratory studies on bulk aqueous phase photochemical reactivity of organic species, and its potential efficient impacts on i) atmospheric life-times of soluble organic species, ii) organic acid formation, iii) OH to HO2 radicals conversion, iv) oligomer formation and vi) SOA formation. It will present our recent development of a structure-activity-relationship (SAR) on OH-oxidation of organic species in the aqueous-phase. The last part of the presentation will report on very recent results from our ongoing national CUMULUS project that investigates integrated multiphase experiments of isoprene photooxidation during cloud condensation-evaporation cycles performed in the CESAM smog chamber.