Particle formation events measured at a semirural background site in Denmark

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Abstract

The particle formation and growth events observed at a semirural background site in Denmark were analyzed based on particle number size distribution data collected during the period from February 2005 to December 2010. The new particle formation (NPF) events have been classified visually in detail according to 3D daily plots in combination with an automatic routine. A clear seasonal variation was found in the way that events occurred more frequently during the warm season from May to September and especially in June. The mean values of the apparent 6 nm particle formation rates, the growth rate and the condensation sink were about 0.36 cm(-3) s(-1), 2.6 nm h(-1), 4.3 x 10(-3) s(-1), respectively. A positive relationship of oxidation capacity (O-X = O-3 + NO2) of the atmosphere and the appearance of NPF events was found indicating that the oxidation of the atmosphere was linked to the formation of new particles. An analysis of a 3-day backward trajectories revealed that NW air masses from the North Sea were giving the highest probability of NPF events, namely between 20 and 40 %.

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Authors
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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Environmental Sciences

Keywords

  • Particle number size distribution, Formation and growth event, Trajectory, Oxidation capacity
Original languageEnglish
Pages (from-to)3050-3059
JournalEnvironmental Science and Pollution Research
Volume20
Issue number5
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

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)