Atmos. Chem. Phys. Discuss., 8, 20661-20685, 2008
www.atmos-chem-phys-discuss.net/8/20661/2008/
doi:10.5194/acpd-8-20661-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC
K. Lehtipalo1, M. Sipilä1,*, I. Riipinen1, T. Nieminen1, and M. Kulmala1
1Department of Physical Sciences, University of Helsinki, Finland
*also at: Helsinki Institute of Physics, Helsinki, Finland

Abstract. 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, the medians being 8060 cm−3 in year 2007 and 3380 cm−3 in 2008. 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.

Citation: Lehtipalo, K., Sipilä, M., Riipinen, I., Nieminen, T., and Kulmala, M.: Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC, Atmos. Chem. Phys. Discuss., 8, 20661-20685, doi:10.5194/acpd-8-20661-2008, 2008.
 
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