Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-10105-2008
http://www.atmos-chem-phys-discuss.net/8/10105/2008/
http://www.atmos-chem-phys-discuss.net/8/10105/2008/acpd-8-10105-2008.html
http://www.atmos-chem-phys-discuss.net/8/10105/2008/acpd-8-10105-2008.pdf
10105
10151
2008-05-30
Relating CCN activity, volatility, and droplet growth kinetics of β-caryophyllene secondary organic aerosol
A. Asa-Awuku
G. J. Engelhart
B. H. Lee
S. N. Pandis
A. Nenes
nenes@eas.gatech.edu
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh,\newline Pennsylvania, USA
Department of Chemical Engineering, University of Patras, Patra, Greece
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
This study investigates the droplet formation characteristics of
secondary organic aerosol (SOA) formed during the ozonolysis of
sesquiterpene β-caryophyllene (with and without hydroxyl
radicals present). Emphasis is placed on understanding the role of
semi-volatile material on Cloud Condensation Nucleus (CCN) activity
and droplet growth kinetics. Aging of β-caryophyllene SOA
significantly affects all CCN-relevant properties measured
throughout the experiments. Using a thermodenuder and two CCN
instruments, we find that CCN activity is a strong function of
temperature (activation diameter at ~0.6% supersaturation: 100±10 nm at
20°C and 130±10 nm at 35°C), suggesting that the
hygroscopic fraction of the SOA is volatile. The water-soluble
organic carbon (WSOC) is extracted from the SOA and characterized
with Köhler Theory Analysis (KTA); the results suggest that the WSOC
is composed of low molecular weight (<200 g mol<sup>−1</sup>) slightly
surface-active material that constitute 5–15% of the SOA mass.
These properties are similar to the water-soluble fraction of
monoterpene SOA, suggesting that predictive understanding of SOA CCN
activity requires knowledge of the WSOC fraction but not its exact
speciation. Droplet growth kinetics of the CCN are found to be
strongly anticorrelated with WSOC fraction, suggesting that the
insoluble material in the SOA forms a kinetic barrier that delays
droplet growth. These results have important implications for
the droplet formation characteristics of SOA, and the atmospheric
relevance of CCN measurements carried out at temperatures different
from ambient.
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