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European Geosciences Union, Atmospheric Chemistry and Physics, 12(6), p. 5549-5557, 2006

DOI: 10.5194/acp-6-5549-2006

European Geosciences Union, Atmospheric Chemistry and Physics Discussions, 5(6), p. 8485-8510

DOI: 10.5194/acpd-6-8485-2006

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Using discriminant analysis as a nucleation event classification method

Journal article published in 2006 by S. Mikkonen ORCID, Kej E. J. Lehtinen, A. Hamed, J. Joutsensaari, Mc C. Facchini ORCID, A. Laaksonen ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.