The National Science Foundation (NSF) awarded a $797,203 Project Grant under its Geosciences program (CFDA 47.050) to the University of California Irvine (UC Irvine). The goal of this 3-year project, with an end date of January 2027, is to better understand how photochemical reactions in the solid or liquid phase of organic compounds affect the key properties of organic aerosol in the atmosphere. The research will focus on secondary organic aerosol (SOA) and/or biomass burning organic aerosol (BBOA) and aims to: (1) compare photochemical processes in different aerosol matrices, (2) assess the importance of direct and indirect photochemical processes in SOA and BBOA, and (3) examine the effect of condensed-phase photochemistry on aerosol properties like absorption coefficients, viscosity, and phase behavior. This work will be conducted through experiments in a smog chamber or oxidation flow reactor, and will support the training of graduate and undergraduate students. The results will be disseminated through publications, meetings, and public outreach.
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