Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 1 2007 10.5194/acpd-7-203-2007 http://www.atmos-chem-phys-discuss.net/7/203/2007/ http://www.atmos-chem-phys-discuss.net/7/203/2007/acpd-7-203-2007.html http://www.atmos-chem-phys-discuss.net/7/203/2007/acpd-7-203-2007.pdf 203 245 2007-01-10 Investigative modeling of new pathways for secondary organic aerosol formation B. K. Pun pun@aer.com C. Seigneur Atmospheric and Environmental Research, Inc., 2682 Bishop Drive, Suite 120, San Ramon, CA 94583, USA Recent advances in secondary organic aerosol (SOA) research are reviewed and the status of current understanding is investigated using a model of SOA formation. Benzene and isoprene are newly identified precursors that are included in this SOA model; these precursors form SOA via secondary products. The model is also extended to include some representation of aqueous partitioning and the formation of high molecular weight products via oligomerization. Experimental data and empirical relationships are used where possible, because a detailed representation of SOA formation is not supported by the current state of information. Sensitivity studies are conducted with the SOA model and SOA predictions are found to be very sensitive to the treatment of the interactions between particulate water and organic compounds. While uncertainties due to model formulation are significant, influential model parameters include the aerosol partitioning ratios for several small products of isoprene and the partitioning constants for unidentified products (currently, the partitioning constants are derived by fitting experimental data). The pH value used as the reference for the activation of oligomerization is also a critical parameter. 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