Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 20 2009 10.5194/acp-9-8121-2009 http://www.atmos-chem-phys.net/9/8121/2009/ http://www.atmos-chem-phys.net/9/8121/2009/acp-9-8121-2009.html http://www.atmos-chem-phys.net/9/8121/2009/acp-9-8121-2009.pdf 8121 8137 2009-10-28 New particle formation from the oxidation of direct emissions of pine seedlings L. Q. Hao liqing@uku.fi P. Yli-Pirilä P. Tiitta S. Romakkaniemi P. Vaattovaara M. K. Kajos J. Rinne J. Heijari A. Kortelainen P. Miettinen J. H. Kroll J. K. Holopainen J. N. Smith J. Joutsensaari M. Kulmala D. R. Worsnop A. Laaksonen Department of Physics, University of Kuopio, Kuopio, 70211, Finland Department of Environmental Sciences, University of Kuopio, Kuopio, 70211, Finland Department of Physics, P.O box 68, University of Helsinki, Helsinki, 00014, Finland Aerodyne Research, Inc., Billerica, MA 08121-3976, USA Finnish Meteorological Institute, Helsinki, 00101, Finland Atmospheric Chemistry Division, National Center for Atmospheric Res., 1850 Table Mesa Dr., Boulder, CO, 80305, USA Finnish Meteorological Institute, Kuopio, 70211, Finland now also at: Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge MA, USA Measurements of particle formation following the gas phase oxidation of volatile organic compounds (VOCs) emitted by Scots pine (<i>Pinus sylvestris</i> L.) seedlings are reported. Particle formation and condensational growth both from ozone (O₃) and hydroxyl radical (OH) initiated oxidation of pine emissions (about 20-120 ppb) were investigated in a smog chamber. During experiments, tetramethylethylene (TME) and 2-butanol were added to control the concentrations of O₃ and OH. Particle formation and condensational growth rates were interpreted with a chemical kinetic model. Scots pine emissions mainly included α-pinene, β-pinene, Δ³-carene, limonene, myrcene and β-phellandrene, composing more than 95% of total emissions. Modeled OH concentrations in the O₃- and OH-induced experiments were on the order of ~10⁶ molecules cm^&minus;3. Our results demonstrate that OH-initiated oxidation of VOCs plays an important role in the nucleation process during the initial new particle formation stage. 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