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Thomas Holst

Forskare

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

Författare

  • 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
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Summary, in English

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.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • Kärnfysik

Publiceringsår

2008

Språk

Engelska

Sidor

353-364

Publikation/Tidskrift/Serie

Tellus. Series B: Chemical and Physical Meteorology

Volym

60

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Physical Geography
  • Subatomic Physics

Status

Published

Forskningsgrupp

  • Aerosol, Nuclear Physics

ISBN/ISSN/Övrigt

  • ISSN: 0280-6509