Browsing Faculty of Natural and Agricultural Sciences by Author "Gagné, S."
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Atmospheric ions and nucleation: a review of observations
Hirsikko, T.; Laakso, L.; Nieminen, S.; Gagné, S.; Lehtipalo, K. (EGU, 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
Gagné, S.; Laakso, L.; Leppä, J.; Petäjä, T.; McGrath, M.J (EGU, 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
Leppä, J.; Laakso, L.; Gagné, S.; Manninen, H.E.; Lehtinen, K.E.J. (EGU, 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 ...