Now showing items 1-3 of 3

    • Atmospheric ions and nucleation: a review of observations 

      Laakso, L.; Hirsikko, T.; Nieminen, S.; Gagné, S.; Lehtipalo, K. (Copernicus Publications, 2011)
      This review is based on ca. 260 publications, 93 of which included data on the temporal and spatial variation of the concentration of small ions (<1.6 nm in diameter) especially in the lower troposphere, chemical composition, ...
    • Measurements of aerosol charging states in Helsinki, Finland 

      Kulmala, M.; Laakso, L.; Vana, M.; Gagné, S.; Leppä, J.; Petäjä, T.; McGrath, M.J; Kerminen, V.-M. (Copernicus Publications, 2011)
      The charging state of aerosol populations was measured with an Ion-DMPS in Helsinki, Finland between December 2008 and February 2010. Based on the charging states, we calculated the ion-induced nucleation fraction to be ...
    • Using measurements of the aerosol charging state in determination of the particle growth rate and the proportion of ion-induced nucleation 

      Leppa, J.; Gagné, S.; Laakso, L.; Manninen, H.E.; Lehtinen, K.E.J. (Copernicus Publications, 2013)
      The fraction of charged nucleation mode particles as a function of particle diameter depends on the particle growth rate and the proportion of particles formed via ion-induced nucleation. In this study we have tested the ...