Atmos. Chem. Phys. Discuss., 9, 15867-15889, 2009
www.atmos-chem-phys-discuss.net/9/15867/2009/
doi:10.5194/acpd-9-15867-2009
© Author(s) 2009. 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.
Measuring condensation sink and ion sink of atmospheric aerosols with the electrical low pressure impactor (ELPI)
H. Kuuluvainen1, J. Kannosto1, A. Virtanen1, J. M. Mäkelä1, M. Kulmala2, P. Aalto2, and J. Keskinen1
1Aerosol Physics Laboratory, Department of Physics, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland
2Department of Physical Sciences, Division of Atmospheric Sciences, University of Helsinki, P.O. Box 64, 00014 University of Helsinki, Finland

Abstract. We investigate the suitability of ELPI for condensation sink and ion sink measurements. The aim is to find the simple calibration factors by which the measured ELPI currents can be converted to condensation or ion sinks. The calibration is based on DMPS and ELPI measurements within the period 15–25 May 2005 at a boreal forest site in Southern Finland. The values of condensation sink and ion sink were calculated from the DMPS size distributions using their theoretical definitions. After that the values were compared to theoretical and measured ELPI current, and calibration factors were specified. For condensation sink the calibration factor was found to be 7.27 E-06 s−1 fA−1 and for ion sink 7.33 E-06 s−1 fA−1. Simply by multiplying the total current of the outdoor ELPI by these factors, the values of condensation sink and ion sink can be measured.

Citation: Kuuluvainen, H., Kannosto, J., Virtanen, A., Mäkelä, J. M., Kulmala, M., Aalto, P., and Keskinen, J.: Measuring condensation sink and ion sink of atmospheric aerosols with the electrical low pressure impactor (ELPI), Atmos. Chem. Phys. Discuss., 9, 15867-15889, doi:10.5194/acpd-9-15867-2009, 2009.
 
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