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| Titel |
Comprehensively accounting for the effect of giant CCN in cloud activation parameterizations |
| VerfasserIn |
D. Barahona, R. E. L. West, P. Stier, S. Romakkaniemi, H. Kokkola, A. Nenes |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2010-03-11), S.2467-2473 |
| Datensatznummer |
250008181
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| Publikation (Nr.) |
 copernicus.org/acp-10-2467-2010.pdf |
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| Zusammenfassung |
| Large cloud condensation nuclei (CCN) (e.g., aged dust particles and seasalt)
cannot attain their equilibrium size during the typical timescale of cloud
droplet activation. Cloud activation parameterizations applied to aerosol with a
large fraction of large CCN often do not account for this limitation
adequately and can give biased predictions of cloud droplet number
concentration (CDNC). Here we present a simple approach to address this
problem that can easily be incorporated into cloud activation
parameterizations. This method is demonstrated with activation
parameterizations based on the "population splitting" concept of Nenes and
Seinfeld (2003); it is shown that accounting for large CCN effects
eliminates a positive bias in CDNC where the aerosol dry geometric diameter
is greater than 0.5 μm. The method proposed here can also be extended
to include the water vapor depletion from pre-existing droplets and ice
crystals in global and regional atmospheric models. |
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