Waterfalls as sources of small charged aerosol particles L. Laakso1, A. Hirsikko1, T. Grönholm1, M. Kulmala1, A. Luts2, and T.-E. Parts2 1Department of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland 2Institute of Environmental Physics, University of Tartu, Ülikooli 18, 50090 Tartu, Estonia
Abstract. In this study, we measured the mobility distributions of cluster
and intermediate ions with an ion spectrometer near a waterfall.
We observed that the concentration of negative 1.5–10 nm ions was
one-hundred fold higher than a reference point 100 m away from the
waterfall. Also, the concentration of positive intermediate ions
was found to be higher than that at the reference point by a
factor of ten. This difference was observed only at the smallest
sizes; above 10 nm the difference was insignificant.
Citation: Laakso, L., Hirsikko, A., Grönholm, T., Kulmala, M., Luts, A., and Parts, T.-E.: Waterfalls as sources of small charged aerosol particles, Atmos. Chem. Phys., 7, 2271-2275, doi:10.5194/acp-7-2271-2007, 2007.