Abstract

A large portion of atmospheric aerosol particles consists of secondary material produced by oxidation reactions. The relative importance of secondary organic aerosol (SOA) can increase with improved emission regulations. A relatively simple way to study potential particle formation in the atmosphere is by using oxidation flow reactors (OFRs) which simulate atmospheric ageing. Here we report on the first ambient OFR ageing experiment in Europe, coupled with scanning mobility particle sizer (SMPS), aerosol mass spectrometer (AMS) and proton transfer reaction (PTR)-MS measurements. We found that the simulated ageing did not produce any measurable increases in particle mass or number concentrations during the two months of the campaign due to low concentrations of precursors. Losses in the reactor increased with hydroxyl radical (OH) exposure and with increasing difference between ambient and reactor temperatures, indicating fragmentation and evaporation of semivolatile material.

Original languageEnglish
Article number408
JournalAtmosphere
Volume10
Issue number7
DOIs
Publication statusPublished - 2019 Jul 17

Subject classification (UKÄ)

  • Meteorology and Atmospheric Sciences

Free keywords

  • Ambient aerosol
  • Oxidation flow reactor
  • PAM
  • Secondary organic aerosol

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