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| Titel |
Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC |
| VerfasserIn |
K. Lehtipalo, M. Sipilä, I. Riipinen, T. Nieminen, 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 ; 9, no. 12 ; Nr. 9, no. 12 (2009-06-23), S.4177-4184 |
| Datensatznummer |
250007443
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| Publikation (Nr.) |
 copernicus.org/acp-9-4177-2009.pdf |
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| Zusammenfassung |
| We measured the size distribution of atmospheric neutral and charged
clusters and particles down to mobility diameter around 1.5 nm by applying
pulse-height CPC technique at SMEAR II station in Hyytiälä, southern
Finland during spring 2007 and May 2008. The concentration of molecular
clusters smaller than 3 nm seems to be highly variable in boreal forest
environment, the concentration varied typically between 500–50 000 cm−3.
By comparing to concentrations measured with ion spectrometers,
we conclude that ion clusters and neutral clusters produced by ion-ion
recombination are usually not sufficient to explain all of the observed
clusters; the median fraction of recombination products from all neutral
clusters was 4.9%. Before and during most new particle formation events
the cluster formation rate rose only slightly, or remained close to stable.
Nocturnal formation of clusters was also frequently observed. |
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