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Träfflista för sökning "WFRF:(Swietlicki Erik) ;pers:(Rissler Jenny)"

Sökning: WFRF:(Swietlicki Erik) > Rissler Jenny

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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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  • Rissler, Jenny, et al. (författare)
  • An evaluation and comparison of cloud condensation nucleus activity models: Predicting particle critical saturation from growth at subsaturation
  • 2010
  • Ingår i: Journal of Geophysical Research. - 2156-2202. ; 115
  • Tidskriftsartikel (refereegranskat)abstract
    • The ability of particles to activate and form cloud droplets influences the functioning of the Earth's hydrological cycle. This work links the particle water uptake at subsaturation to the critical supersaturation ratio needed for particles to become cloud condensation nuclei (CCN). Five models using the particle hygroscopic growth at subsaturation for predicting the critical supersaturation needed for droplet activation were applied to a laboratory data set of inorganic and organic compounds and mixtures of them. The data set consisted of hygroscopicity tandem differential mobility analyzer measurements and CCN counter measurements. No chemical composition information was used when applying the models. All models tested were based on modifications of Kohler theory and gave similar results. The agreement between predicted and measured critical supersaturations was good, considering the relatively simple models used. A trend of overestimating the critical supersaturations was observed, typically by similar to 15%. The best performing model gave on average only a 4% offset from experimental values; the model with the largest deviation was offset by 20%. A comparison was made between the number of soluble entities (ions or nondissociating molecules) estimated from the particle hygroscopic growth at 90% relative humidity (RH) and the number estimated from the particle critical supersaturation; a similar to 35% increase was observed in the effective number of entities in solution when going from 90% RH to activation. For many types of aerosols, differences in the model approaches tested do not induce large differences in the predicted critical supersaturation. However, it is most important to follow the recommendations published with the respective models and not use them indiscriminately.
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  • Resultat 11-20 av 74
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