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| Titel |
Estimating the contribution of ion–ion recombination to sub-2 nm cluster concentrations from atmospheric measurements |
| VerfasserIn |
J. Kontkanen, K. E. J. Lehtinen, T. Nieminen, H. E. Manninen, K. Lehtipalo, V.-M. Kerminen, M. Kulmala  |
| 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 ; 13, no. 22 ; Nr. 13, no. 22 (2013-11-25), S.11391-11401 |
| Datensatznummer |
250085833
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| Publikation (Nr.) |
 copernicus.org/acp-13-11391-2013.pdf |
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| Zusammenfassung |
| The significance of ion–ion recombination for atmospheric new particle
formation is not well quantified. Here we present and evaluate a method for
determining the size distribution of recombination products from the size
distributions of neutral and charged clusters. Our method takes into account
the production of recombination products in the collisions between
oppositely charged ions and the loss due to coagulation. Furthermore, unlike
previous studies, we also consider the effect of condensational growth on
the size distribution of recombination products. We applied our method to
the data measured in Hyytiälä, Finland, to estimate the contribution
of ion–ion recombination to the concentrations of atmospheric clusters in
the size range of 0.9–2.1 nm. We observed that the concentration of
recombination products was highest in the size classes between 1.5 and 1.9 nm. The median concentrations of recombination products were between 6 and
69 cm−3 in different size classes, which resulted in a
small proportion of all neutral clusters, varying between 0.2 and
13%. When examining the whole size range between 0.9 and 2.1 nm, the
median fraction of recombination products of all neutral clusters was only
1.5%. We also investigated how the results change if the effect of
condensational growth is neglected. It seems that with that assumption the
fragmentation of newly formed recombination products has to be taken into
account, or else the concentration of recombination products is
overestimated. Overall, we concluded that our method provides reasonable
results, which are consistent with the earlier estimates on the contribution
of recombination products to atmospheric cluster population in
Hyytiälä. Still, in order to determine the size distribution of
recombination products more accurately in the future, more precise
measurements of the size distribution of atmospheric clusters would be
needed. |
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