Atmos. Chem. Phys. Discuss., 6, 6587-6612, 2006
www.atmos-chem-phys-discuss.net/6/6587/2006/
doi:10.5194/acpd-6-6587-2006
© Author(s) 2006. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Direct measurement of particle formation and growth from the oxidation of biogenic emissions
T. M. VanReken1, J. P. Greenberg2, P. C. Harley2, A. B. Guenther2, and J. N. Smith2
1Advanced Study Program, National Center for Atmospheric Research, Boulder, CO, USA
2Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USA

Abstract. A new facility has been developed to investigate the formation of new particles from the oxidation of volatile organic compounds emitted from vegetation. The facility consists of a biogenic emissions enclosure, an aerosol growth chamber, and the associated instrumentation. Using the facility, new particle formation events have been induced through the reaction of ozone with three different precursor gas mixtures: an α-pinene test mixture and the emissions of Holm oak (Quercus ilex) and loblolly pine (Pinus taeda). The results demonstrate the variability between species in their potential to form new aerosol products. The emissions of Q. ilex resulted in fewer particles than did α-pinene, although the concentration of monoterpenes was roughly equal in both experiments before the addition of ozone. Conversely, the oxidation of P. taeda emissions led to the formation of more particles than either of the other two gas mixtures, despite a lower initial terpenoid concentration. These variations can be attributed to differences in the speciation of the vegetative emissions with respect to the α-pinene mixture and to each other. Specifically, the presence of β-pinene and other slower-reacting monoterpenes inhibited particle formation in the Q. ilex experiment, while the presence of sesquiterpenes, including β-caryophyllene, in the emissions of P. taeda were the likely cause of the more intense particle formation events observed during that experiment.

Citation: VanReken, T. M., Greenberg, J. P., Harley, P. C., Guenther, A. B., and Smith, J. N.: Direct measurement of particle formation and growth from the oxidation of biogenic emissions, Atmos. Chem. Phys. Discuss., 6, 6587-6612, doi:10.5194/acpd-6-6587-2006, 2006.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share