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Träfflista för sökning "WFRF:(Swietlicki Erik) ;pers:(Nilsson Patrik)"

Sökning: WFRF:(Swietlicki Erik) > Nilsson Patrik

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  • Eriksson, Axel, et al. (författare)
  • Diesel soot aging in urban plumes within hours under cold dark and humid conditions
  • 2017
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322.
  • Tidskriftsartikel (refereegranskat)abstract
    • Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake.
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  • Nordin, Erik, et al. (författare)
  • Smog Chamber Experiments of SOA Formation from Gasoline Exhaust and Light Aromatics
  • 2010
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Experiments where gasoline exhaust was exposed to UV-radiation to examine Secondary Organic Aerosol (SOA) formation were performed in a smog chamber. The Aerosol Mass Yield (formed SOA/reacted precursor mass) was determined and compared with the yield from a pure precursor experiment in the chamber and from results reported in literature. Preliminary results show that the majority of the organic aerosol mass emitted from idling gasoline cars is secondary. Further, the SOA yields when taking only C6-C10 light aromatics into account are within a similar range to pure precursor experiments, suggesting that light aromatics are dominating precursors in gasoline exhaust SOA.
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