Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-11511-2007
http://www.atmos-chem-phys-discuss.net/7/11511/2007/
http://www.atmos-chem-phys-discuss.net/7/11511/2007/acpd-7-11511-2007.html
http://www.atmos-chem-phys-discuss.net/7/11511/2007/acpd-7-11511-2007.pdf
11511
11544
2007-08-06
LACIS-measurements and parameterization of sea-salt particle hygroscopic growth and activation
D. Niedermeier
niederm@tropos.de
F. Stratmann
H. Wex
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. 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" <i>ρ</i><sub>ion</sub>. For each sea-salt sample an average <i>ρ</i><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: 0.10%, 0.16% and 0.30%. A CCN-closure was tested by calculating
the critical diameters <i>D</i><sub>crit</sub> for the sea-salt particles at these supersaturations,
using the Köhler model and the corresponding <i>ρ</i><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 <i>D</i><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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