Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-14643-2008 http://www.atmos-chem-phys-discuss.net/8/14643/2008/ http://www.atmos-chem-phys-discuss.net/8/14643/2008/acpd-8-14643-2008.html http://www.atmos-chem-phys-discuss.net/8/14643/2008/acpd-8-14643-2008.pdf 14643 14716 2008-07-31 Isoprene photooxidation mechanism: resonance channels and implications for the production of nitrates and acids F. Paulot paulot@caltech.edu J. D. Crounse H. G. Kjaergaard J. H. Kroll J. H. Seinfeld P. O. Wennberg Division of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA Department of Chemistry, University of Otago, Dunedin, New Zealand Center for Aerosol and Cloud Chemistry, Aerodyne Inc., Billerica, MA, USA Division of Geophysical and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA We describe a nearly explicit chemical mechanism for isoprene photooxidation guided by chamber studies that include time-resolved observation of an extensive suite of volatile compounds. We provide new constraints on the chemistry of the poorly-understood isoprene resonance channels, which account for more than one third of the total isoprene carbon flux and a larger fraction of the nitrate yields. 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