Articles | Volume 6, issue 12
Atmos. Chem. Phys., 6, 5549–5557, 2006
https://doi.org/10.5194/acp-6-5549-2006

Special issue: Quantification of aerosol nucleation in the European boundary...

Atmos. Chem. Phys., 6, 5549–5557, 2006
https://doi.org/10.5194/acp-6-5549-2006

  11 Dec 2006

11 Dec 2006

Using discriminant analysis as a nucleation event classification method

S. Mikkonen1, K. E. J. Lehtinen1,2, A. Hamed1, J. Joutsensaari3, M. C. Facchini4, and A. Laaksonen1 S. Mikkonen et al.
  • 1Department of Physics, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland
  • 2Finnish meteorological institute, Kuopio Unit, P.O. Box 1627, 70210 Kuopio, Finland
  • 3Department of Environmental Sciences, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland
  • 4Istituto di Scienze dell'Atmosfera e del Clima – CNR, Italy Via Gobetti 101, 40 129 Bologna, Italy

Abstract. More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the meteorological and trace gas variables effect on the emergence of nucleation events. As the analysis method, we used discriminant analysis with non-parametric Epanechnikov kernel, included in non-parametric density estimation method. The best classification result in our data was reached with the combination of relative humidity, ozone concentration and a third degree polynomial of radiation. RH appeared to have a preventing effect on the new particle formation whereas the effects of O3 and radiation were more conductive. The concentration of SO2 and NO2 also appeared to have significant effect on the emergence of nucleation events but because of the great amount of missing observations, we had to exclude them from the final analysis.

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