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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 3, issue 1
Atmos. Chem. Phys., 3, 251–257, 2003
https://doi.org/10.5194/acp-3-251-2003
© Author(s) 2003. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Atmos. Chem. Phys., 3, 251–257, 2003
https://doi.org/10.5194/acp-3-251-2003
© Author(s) 2003. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  21 Feb 2003

21 Feb 2003

A model for particle formation and growth in the atmosphere with molecular resolution in size

K. E. J. Lehtinen and M. Kulmala K. E. J. Lehtinen and M. Kulmala
  • Helsinki University, Dept. Physical Sciences, P.O. Box 64, 00014 Univ. of Helsinki, Finland

Abstract. The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems that are a nuisance for typical simulation methods using a sectional representation for the particle size distribution. For condensational growth, a slight modification is proposed for the Fuchs-Sutugin expression, which improves the prediction of the growth rate of nano-sized particles by as much as a factor of two. The presented method is applied to particle formation in a Finnish Boreal forest and is shown to capture the essential features of the dynamics quite nicely. Furthermore, it is shown that the growth of the particles is roughly linear, which means that the amount of condensable vapour is constant (of the order 1013 1/m3).

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