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| Titel |
Night-time enhanced atmospheric ion concentrations in the marine boundary layer |
| VerfasserIn |
N. Kalivitis, I. Stavroulas, A. Bougiatioti, G. Kouvarakis, S. Gagné, H. E. Manninen, M. Kulmala  , N. Mihalopoulos |
| 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 ; 12, no. 8 ; Nr. 12, no. 8 (2012-04-17), S.3627-3638 |
| Datensatznummer |
250011065
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| Publikation (Nr.) |
 copernicus.org/acp-12-3627-2012.pdf |
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| Zusammenfassung |
| Measurements of atmospheric ions in the size range 0.8–42 nm were
conducted at the environmental research station of the University of Crete
at Finokalia from April 2008 to April 2009 in the frame of the EUCAARI
project. Both positive and negative atmospheric ions were found to have a
clear annual cycle, with minimum concentrations in summer. Their
concentrations were found to vary with the prevailing meteorology and the
abundance of aerosol particles in the atmosphere. High concentrations of
ions were observed during new particle formation events. There were 53
nucleation events recorded. It was found that under certain atmospheric
conditions enhanced ion concentrations can be observed during night.
Overall, 39 night-time events were observed, all of them observed for the
negatively charged particles while only 21 were observed for the positively
charged particles. Night-time enhanced ion concentrations were more frequent
during spring and autumn and no such events were recorded from July to
September. A strong anti-correlation was found between air ion
concentrations, especially at cluster sizes (1.25–1.66 nm), and
condensation and coagulation sinks. Enhanced ion concentrations at night
were found to be more frequent when air masses had traveled over the island
of Crete, indicating possible association with local biogenic sources. |
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