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| Titel |
Atmospheric new particle formation: real and apparent growth of neutral and charged particles |
| VerfasserIn |
J. Leppä, T. Anttila, V.-M. Kerminen, M. Kulmala  , K. E. J. Lehtinen |
| 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 ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-27), S.4939-4955 |
| Datensatznummer |
250009766
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| Publikation (Nr.) |
 copernicus.org/acp-11-4939-2011.pdf |
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| Zusammenfassung |
| In this study we have provided simple analytical formulae to estimate the
growth rate of a nucleation mode due to self-coagulation and the apparent
growth rate due to coagulation scavenging by larger particles. These
formulae were used on a set of simulations covering a wide range of
atmospheric conditions. The modal growth rates were determined from the
simulation results by summing the contribution of each process, by
calculating the increase rate in the count mean diameter of the mode and by
following the peak concentration of the mode. The results of these three
methods were compared with each other and the means used to estimate the
growth rate due to self-coagulation and coagulation scavenging were found to
give accurate values. We also investigated the role of charged particles and
electric interactions in the growth of a nucleation mode. Charged particles
were found to increase the growth rate due to both self-coagulation and
coagulation scavenging by a factor of ~1.5 to 2. In case of increased
condensation onto charged particles, the total condensational growth rate of
a nucleation mode may increase significantly in the very early steps of the
growth. The analytical formulae provided by this paper were designed to
provide the growth rates due to different processes from aerosol dynamic
simulations, but the same principles can be used to determine the growth
rates from measurement data. |
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