Atmospheric Chemistry and Physics Discussions
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2009
10.5194/acpd-9-13775-2009
http://www.atmos-chem-phys-discuss.net/9/13775/2009/
http://www.atmos-chem-phys-discuss.net/9/13775/2009/acpd-9-13775-2009.html
http://www.atmos-chem-phys-discuss.net/9/13775/2009/acpd-9-13775-2009.pdf
13775
13799
2009-06-23
Slower CCN growth kinetics of anthropogenic aerosol compared to biogenic aerosol observed at a rural site
N. C. Shantz
nicole.shantz@ec.gc.ca
R. Y.-W. Chang
J. G. Slowik
J. P. D. Abbatt
W. R. Leaitch
Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
Climate Research Division, Science and Technology Branch, Environment Canada, Toronto, Ontario, Canada
now at: Cloud Physics and Severe Weather Research Section, Science and Technology Branch, Environment Canada, Toronto, Ontario, Canada
Growth rates of water droplets were measured with a static diffusion cloud
condensation chamber in May–June 2007 at a rural field site in Southern
Ontario, Canada, 70 km north of Toronto. Observations were made during
periods when the winds were from the south and the site was impacted by
anthropogenic air from the US and Southern Ontario as well as during a
5-day period of northerly wind flow when the aerosol was dominated by
biogenic sources. The growth of droplets on anthropogenic size-selected
particles centred at 0.1 μm diameter and composed of approximately
40% organic and 60% ammonium sulphate (AS) by mass, was delayed on
the order of 1 second compared to a pure AS aerosol. Simulations of the
growth rate indicate that a lowering of the water mass accommodation
coefficient from α<sub>c</sub>=1 to an average of α<sub>c</sub>=0.044 is needed (assuming
an insoluble organic with hygroscopicity parameter, κ<sub>org</sub>, of zero). In
contrast, the growth rate of the aerosol of biogenic character, consisting
of >80% organic, was similar to that of pure AS. Simulations of the
predominantly biogenic aerosol show agreement between the observations and
simulations when κ<sub>org</sub>=0.05–0.2 and α<sub>c</sub>=1. Inhibition of water uptake
by the anthropogenic organic applied to an adiabatic cloud parcel model in
the form of a constant low α<sub>c</sub> increases the number of droplets in a
cloud compared to pure AS. If the α<sub>c</sub> is assumed to increase with
increasing liquid water on the droplets, then the number of droplets
decreases which could diminish the indirect effect. The slightly lower
κ<sub>org</sub> in the biogenic case decreases the number of droplets in a cloud
compared to pure AS.
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