Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
8
3
2008
10.5194/acp-8-579-2008
http://www.atmos-chem-phys.net/8/579/2008/
http://www.atmos-chem-phys.net/8/579/2008/acp-8-579-2008.html
http://www.atmos-chem-phys.net/8/579/2008/acp-8-579-2008.pdf
579
590
2008-02-07
LACIS-measurements and parameterization of sea-salt particle hygroscopic growth and activation
D. Niedermeier
niederm@tropos.de
H. Wex
J. Voigtländer
F. Stratmann
E. Brüggemann
A. Kiselev
H. Henk
J. Heintzenberg
Leibniz Institute for Tropospheric Research, Permoser Str. 15, 04318 Leipzig, Germany
The Leipzig Aerosol Cloud Interaction Simulator (LACIS) was used to
investigate the hygroscopic growth and activation of sea-salt
particles which were generated from three different sea-water
samples. The measurements showed that the sea-salt particles exhibit
a slightly reduced hygroscopic growth compared to pure NaCl
particles. Köhler theory was utilized to model the hygroscopic
growth of these particles. Some parameters used in this model are
unknown for sea-salt. These parameters are combined in an "ionic
density" ρ<sub>ion</sub>. For each sea-salt sample an average
ρ<sub>ion</sub> was determined by fitting the Köhler equation
to the data from the hygroscopic growth measurements. LACIS was also
used to measure the activation of the sea-salt particles at three
different supersaturations: 0.11%, 0.17% and 0.32%. A CCN-closure
was tested by calculating the critical diameters D<sub>crit</sub> for
the sea-salt particles at these supersaturations, using the
Köhler model and the corresponding ρ<sub>ion</sub> as derived
from the hygroscopic growth data. These calculated critical
diameters were compared to the measured ones. Measured and
calculated values of D<sub>crit</sub> agree within the level of
uncertainty. Based on this successful closure, a new
parameterization to describe sea-salt-particle hygroscopic growth
(at RH>95%) and activation has been developed.
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