Aerosol particle formation events and analysis of high growth rates observed above a subarctic wetland-forest mosaic

Birgitta Svenningsson, Almut Arneth, Sean Hayward, Thomas Holst, Andreas Massling, Erik Swietlicki, Anne Hirsikko, Heikki Junninen, Ilona Riipinen, Marko Vana, Miikka Dal Maso, Tareq Hussein, Markku Kulmala

Forskningsoutput: Bidrag till övrig tidskrift/dags- eller nyhetstidningArtikel i facktidskrift eller populärpressPopulärvetenskap


An analysis of particle formation (PF) events over a subarctic mire in northern Sweden was performed, based on number size distributions of atmospheric aerosol particles (10-500 nm in diameter) and ions (0.4-40 nm in Tammet diameter). We present classification statistics for PF events from measurements covering the period July 2005- September 2006, with a break over the winter period. The PF event frequency peaked during the summer months, in contrast to other Scandinavian sites where the frequency is highest during spring and autumn. Our analysis concentrates on calculated growth rates and estimates of concentrations and production rates of condensing vapour, deduced from the growth rates and condensational sink calculations, using AIS and SMPS data. Particle formation events with high growth rates (up to 50 nm/h) occurred repeatedly. In these cases, the newly formed nucleation mode particles were often only present for periods of a few hours. On several occasions repeated particle formation events were observed within one day, with differences in onset time of a few hour. These high growth rates were only observed when the condensation sink was higher than 0.001 s-1.
SpecialistpublikationTellus. Series B: Chemical and Physical Meteorology
StatusPublished - 2008

Bibliografisk information

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007), Dept of Physical Geography and Ecosystem Science (011010000)

Ämnesklassifikation (UKÄ)

  • Naturgeografi
  • Subatomär fysik


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