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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Ion production rate in a boreal forest based on ion, particle and radiation measurements
Atmospheric Chemistry and Physics, Volume 4, No. 7, Year 2004
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Description
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-3 s -1, and based on external radiation and radon measurements, 4.5 ion pairs cm-3 s-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 3 nm, 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. © European Geosciences Union 2004.
Authors & Co-Authors
Laakso, Lauri
Finland, Helsinki
Helsingin Yliopisto
Petäj̈ä, Tuukka
Finland, Helsinki
Helsingin Yliopisto
J. Lehtinen, K. E.
Finland, Helsinki
Helsingin Yliopisto
Kulmala, Markku
Finland, Helsinki
Helsingin Yliopisto
Paatero, Jussi
Finland, Helsinki
Finnish Meteorological Institute
Hõrrak, Urmas
Estonia, Tartu
Tartu Ülikool
Statistics
Citations: 111
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.5194/acp-4-1933-2004
ISSN:
16807316
Research Areas
Cancer
Environmental