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| Titel |
LACIS-measurements and parameterization of sea-salt particle hygroscopic growth and activation |
| VerfasserIn |
D. Niedermeier, H. Wex, J. Voigtländer, F. Stratmann, E. Brüggemann, A. Kiselev, H. Henk, J. Heintzenberg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 3 ; Nr. 8, no. 3 (2008-02-07), S.579-590 |
| Datensatznummer |
250005547
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| Publikation (Nr.) |
 copernicus.org/acp-8-579-2008.pdf |
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| Zusammenfassung |
| 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" ρion. For each sea-salt sample an average
ρion 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 Dcrit for
the sea-salt particles at these supersaturations, using the
Köhler model and the corresponding ρion as derived
from the hygroscopic growth data. These calculated critical
diameters were compared to the measured ones. Measured and
calculated values of Dcrit 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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