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| Titel |
Ion – particle interactions during particle formation and growth at a coniferous forest site in central Europe |
| VerfasserIn |
S. G. Gonser, F. Klein, W. Birmili, J. Gross, M. Kulmala  , H. E. Manninen, A. Wiedensohler, A. Held |
| 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. 19 ; Nr. 14, no. 19 (2014-10-09), S.10547-10563 |
| Datensatznummer |
250119083
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| Publikation (Nr.) |
 copernicus.org/acp-14-10547-2014.pdf |
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| Zusammenfassung |
| In this work, we examined the interaction of ions and neutral particles
during atmospheric new particle formation (NPF) events. The analysis is
based on simultaneous field measurements of atmospheric ions and total
particles using a neutral cluster and air ion spectrometer (NAIS) across the
diameter range 2–25 nm. The Waldstein research site is located in a
spruce forest in NE Bavaria, Southern Germany, known for enhanced radon
concentrations, presumably leading to elevated ionization rates. Our
observations show that the occurrence of the ion nucleation mode preceded
that of the total particle nucleation mode during all analyzed NPF events.
The time difference between the appearance of 2 nm ions and 2 nm total
particles was typically about 20 to 30 min. A cross correlation analysis
showed a rapid decrease of the time difference between the ion and total
modes during the growth process. Eventually, this time delay vanished when
both ions and total particles did grow to larger diameters. Considering the
growth rates of ions and total particles separately, total particles
exhibited enhanced growth rates at diameters below 15 nm. This observation
cannot be explained by condensation or coagulation, because these processes
would act more efficiently on charged particles compared to neutral
particles. To explain our observations, we propose a mechanism including
recombination and attachment of continuously present cluster ions with the
ion nucleation mode and the neutral nucleation mode, respectively. |
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