Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-8261-2009 http://www.atmos-chem-phys-discuss.net/9/8261/2009/ http://www.atmos-chem-phys-discuss.net/9/8261/2009/acpd-9-8261-2009.html http://www.atmos-chem-phys-discuss.net/9/8261/2009/acpd-9-8261-2009.pdf 8261 8305 2009-03-30 A review of Secondary Organic Aerosol (SOA) formation from isoprene A. G. Carlton carlton.annmarie@epa.gov C. Wiedinmyer J. H. Kroll US EPA, Office of Research and Development, Atmospheric Modeling and Analysis Division, Research Triangle Park, NC 27711, USA National Center for Atmospheric Research, Atmospheric Chemistry Division, Boulder CO 80309, USA Aerodyne Research, Inc. 45 Manning Road, Billerica MA 01821, USA now at: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 15 Vassar St. Bldg. 48-323, Cambridge, MA 02139, USA Recent field and laboratory evidence indicates that the oxidation of isoprene, (2-methyl-1,3-butadiene, C₅H₈) forms secondary organic aerosol (SOA). Global biogenic emissions of isoprene (600 Tg yr^−1) are sufficiently large that the formation of SOA in even small yields results in substantial production of atmospheric particulate matter, likely having implications for air quality and climate. Here we present a review of field measurements, experimental work, and modeling studies aimed at understanding the mechanisms, yield, and atmospheric importance of isoprene-derived SOA. SOA yields depend on a number of factors, including organic aerosol loading (M_o), NO_x level (RO₂ chemistry), and, because of the importance of multigenerational chemistry, the degree of oxidation. These dependences are not always included in SOA modules used in atmospheric transport models, and instead most yield parameterizations rely on a single set of chamber experiments (carried out over a limited range of conditions); this may lead to very different estimates of the atmospheric importance of isoprene SOA. New yield parameterizations, based on all available laboratory data (M_o=0−50 ug/m³), are presented here, so that SOA formation may be computed as a function of M_o, NO_x level, and T. Current research needs and future research directions are identified. Altieri, K. E., Carlton, A. 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