Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
12
2009
10.5194/acp-9-4177-2009
http://www.atmos-chem-phys.net/9/4177/2009/
http://www.atmos-chem-phys.net/9/4177/2009/acp-9-4177-2009.html
http://www.atmos-chem-phys.net/9/4177/2009/acp-9-4177-2009.pdf
4177
4184
2009-06-23
Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC
K. Lehtipalo
katrianne.lehtipalo@helsinki.fi
M. Sipilä
I. Riipinen
T. Nieminen
M. Kulmala
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
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<sup>−3</sup>.
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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