Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
6
12
2006
10.5194/acp-6-4403-2006
http://www.atmos-chem-phys.net/6/4403/2006/
http://www.atmos-chem-phys.net/6/4403/2006/acp-6-4403-2006.html
http://www.atmos-chem-phys.net/6/4403/2006/acp-6-4403-2006.pdf
4403
4413
2006-09-29
Direct measurement of particle formation and growth from the oxidation of biogenic emissions
T. M. VanReken
vanreken@ucar.edu
J. P. Greenberg
P. C. Harley
A. B. Guenther
J. N. Smith
Advanced Study Program, National Center for Atmospheric Research, Boulder, CO, USA
Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USA
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 a Holm oak (<i>Quercus ilex</i>) specimen and a loblolly pine
(<i>Pinus taeda</i>) specimen. The results demonstrate the variability between species in their
potential to form new aerosol products. The emissions of <i>Q. ilex</i> specimen 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 <i>P. taeda</i> specimen 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 probably inhibited particle formation
in the <i>Q. ilex</i> experiment, while the presence of sesquiterpenes, including β-caryophyllene, in the emissions of the <i>P. taeda</i> specimen were the likely cause of the more
intense particle formation events observed during that experiment.
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