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| Titel |
Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010 |
| VerfasserIn |
S. Henning, K. Dieckmann, K. Ignatius, M. Schäfer, P. Zedler, E. Harris, B. Sinha, D. van Pinxteren, S. Mertes, W. Birmili, M. Merkel, Z. Wu, A. Wiedensohler, H. Wex, H. Herrmann, F. Stratmann |
| 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 ; 14, no. 15 ; Nr. 14, no. 15 (2014-08-08), S.7859-7868 |
| Datensatznummer |
250118928
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| Publikation (Nr.) |
 copernicus.org/acp-14-7859-2014.pdf |
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| Zusammenfassung |
| Within the framework of the "Hill Cap Cloud Thuringia 2010" (HCCT-2010)
international cloud experiment, the influence of cloud processing on the
activation properties of ambient aerosol particles was investigated.
Particles were probed upwind and downwind of an orographic cap cloud on
Mt Schmücke, which is part of a large mountain ridge in Thuringia, Germany.
The activation properties of the particles were investigated by means of
size-segregated cloud condensation nuclei (CCN) measurements at 3 to 4
different supersaturations. The observed CCN spectra together with the total
particle spectra were used to calculate the hygroscopicity parameter κ
for the upwind and downwind stations. The upwind and downwind critical
diameters and κ values were then compared for defined cloud events
(FCE) and non-cloud events (NCE). Cloud processing was found to increase the
hygroscopicity of the aerosol particles significantly, with an average
increase in κ of 50%. Mass spectrometry analysis and isotopic
analysis of the particles suggest that the observed increase in the
hygroscopicity of the cloud-processed particles is due to an enrichment of
sulfate and possibly also nitrate in the particle phase. |
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