Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-9323-2008
http://www.atmos-chem-phys-discuss.net/8/9323/2008/
http://www.atmos-chem-phys-discuss.net/8/9323/2008/acpd-8-9323-2008.html
http://www.atmos-chem-phys-discuss.net/8/9323/2008/acpd-8-9323-2008.pdf
9323
9346
2008-05-23
The effect of temperature and water on secondary organic aerosol formation from ozonolysis of limonene, Δ³-carene and α-pinene
Å. M. Jonsson
M. Hallquist
hallq@chem.gu.se
E. Ljungström
Dept. of Chemistry, Atmospheric Science, University of Gothenburg, 41296 Göteborg, Sweden
The effect of reaction temperature and how water vapour influences the
formation of secondary organic aerosol (SOA) in ozonolysis of limonene,
Δ<sup>3</sup>-carene and α-pinene, both regarding number and mass
of particles, has been investigated by using a laminar flow reactor G-FROST.
Experiments with cyclohexane and 2-butanol (~3.5×10<sup>14</sup> molecules cm<sup>−3</sup>)
as OH scavengers were compared to experiments without
any scavenger. The reactions were conducted in the temperature range between
298 and 243 K, and at relative humidities between <10 and 80%. Results
showed that there is still a scavenger effect on number and mass
concentrations at low temperatures between experiments with and without OH
scavenger. This shows that the OH chemistry is influencing the SOA formation
also at these temperatures. The overall temperature dependence on SOA
formation is not as strong as expected from the partitioning theory. In some
cases there is even a positive temperature dependence that must be related
to changes in the chemical mechanism and/or reduced rates of secondary
chemistry at low temperatures. The water effect at low temperature could be
explained by physical uptake and cluster stabilisation. At higher
temperatures, only a physical explanation is not sufficient and the
observations are in line with water changing the chemical mechanism or
reaction rates. The data presented adds to the understanding of SOA
contribution to atmospheric aerosol composition, new particle formation and
atmospheric degradation mechanisms.
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