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| Titel |
Ion production rate in a boreal forest based on ion, particle and radiation measurements |
| VerfasserIn |
L. Laakso, T. Petäjä, K. E. J. Lehtinen, M. Kulmala  , J. Paatero, U. Hõrrak, H. Tammet, J. Joutsensaari |
| 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 ; 4, no. 7 ; Nr. 4, no. 7 (2004-09-29), S.1933-1943 |
| Datensatznummer |
250002040
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| Publikation (Nr.) |
 copernicus.org/acp-4-1933-2004.pdf |
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| Zusammenfassung |
| In this study the ion production rates in a boreal forest were
studied based on two different methods: 1) cluster ion and
particle concentration measurements, 2) external radiation and
radon concentration measurements. Both methods produced reasonable
estimates for ion production rates. The average ion production
rate calculated from aerosol particle size distribution and air
ion mobility distribution measurements was 2.6 ion pairs cm-3s-1,
and based on external radiation and radon measurements, 4.5 ion pairs cm-3s-1. The first method based on ion and particle
measurements gave lower values for the ion production rates
especially during the day. A possible reason for this is that
particle measurements started only from 3nm, so the sink of small
ions during the nucleation events was underestimated. It may
also be possible that the hygroscopic growth factors of aerosol
particles were underestimated. Another reason for the
discrepancy is the nucleation mechanism itself. If the ions are
somehow present in the nucleation process, there could have been
an additional ion sink during the nucleation days. |
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