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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 4, 805-822, 2011
https://doi.org/10.5194/amt-4-805-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 May 2011
Intercomparison of air ion spectrometers: an evaluation of results in varying conditions
S. Gagné1, K. Lehtipalo1, H. E. Manninen1, T. Nieminen1, S. Schobesberger1, A. Franchin1, T. Yli-Juuti1, J. Boulon2, A. Sonntag3, S. Mirme4, A. Mirme4, U. Hõrrak4, T. Petäjä1, E. Asmi5, and M. Kulmala1 1Department of Physics, University of Helsinki, P. O. Box 64, 00014 Helsinki, Finland
2Laboratoire de Météorologie Physique, Blaise Pascal Univ., 63000 Clermont-Ferrand, France
3Leibniz Institute for Tropospheric Research, Permoserstrasse 15, 04303 Leipzig, Germany
4Institute of Physics, University of Tartu, Ulikooli 18, 50090 Tartu, Estonia
5Finnish Meteorological Institute, P. O. Box 503, 00101 Helsinki, Finland
Abstract. We evaluated 11 air ion spectrometers from Airel Ltd. after they had spent one year in field measurements as a part of the EUCAARI project: 5 Air Ion Spectrometers (AIS), 5 Neutral cluster and Air Ion Spectrometers (NAIS) and one Airborne NAIS (ANAIS). This is the first time that an ANAIS is evaluated and compared so extensively. The ion spectrometers' mobility and concentration accuracy was evaluated. Their measurements of ambient air were compared between themselves and to reference instruments: a Differential Mobility Particle Sizer (DMPS), a Balanced Scanning Mobility Analyzer (BSMA), and an Ion-DMPS. We report on the simultaneous measurement of a new particle formation (NPF) event by all 11 instruments and the 3 reference instruments. To our knowledge, it is the first time that the size distribution of ions and particles is measured by so many ion spectrometers during a NPF event. The new particle formation rates (~0.2 cm−3 s−1 for ions and ~2 cm−3 s−1 for particles) and growth rates (~25 nm h−1 in the 3–7 nm size range) were calculated for all the instruments. The NAISs and the ANAIS gave higher concentrations and formation rates than the AISs. For example, the AISs agreed with the BSMA within 11 % and 28 % for negative and positive ion concentration respectively, whereas the NAISs agreed within 23 % and 29 %. Finally, based on the results presented here, we give guidelines for data evaluation, when data from different individual ion spectrometers are compared.

Citation: Gagné, S., Lehtipalo, K., Manninen, H. E., Nieminen, T., Schobesberger, S., Franchin, A., Yli-Juuti, T., Boulon, J., Sonntag, A., Mirme, S., Mirme, A., Hõrrak, U., Petäjä, T., Asmi, E., and Kulmala, M.: Intercomparison of air ion spectrometers: an evaluation of results in varying conditions, Atmos. Meas. Tech., 4, 805-822, https://doi.org/10.5194/amt-4-805-2011, 2011.
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