Towards closing the gap between hygroscopic growth and activation for secondary organic aerosol - Part 2: Theoretical approaches
By M. Petters, H. Wex, C. Carrico, E. Hallbauer, A. Massling, G. McMeeking, L. Poulain, Zhijun Wu, S. Kreidenweis, F. Stratmann. 2008
132 citations recorded by the source corpus.
We examine the hygroscopic properties of sec- ondary organic aerosol particles generated through the reac- tion of -pinene and ozone using a continuous flow reaction chamber. The water activity versus composition relation- ship is calculated from measurements of growth factors at relative humidities up to 99.6% and from measurements of cloud condensation nuclei activity. The observed relation- ships are complex, suggesting highly non-ideal behavior for aerosol water contents at relative humidities less than 98%. We present two models that may explain the observed wa- ter activity-composition relationship equally well. The first model assumes that the aerosol is a pseudo binary mixture of infinitely water soluble compounds and sparingly soluble compounds that gradually enter the solution as dilution in- creases. The second model is used to compute the Gibbs free energy of the aerosol-water mixture and shows that the aerosol behaves similarly to what can be expected for single compounds that contain a certain fraction of oxygenated and non-polar functional groups.
Subfields: Atmospheric Science, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/613ae119f04b8b7af6a0b194f50653325114c25b
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In Atmospheric Science
In Global and Planetary Change
Citations in the corpus
- Cloud condensation nucleation activity of biomass burning aerosol (2009, background): “The origin of this discrepancy for the secondary organic aerosols is not fully understood but surface tension effects, gradual dissolution of sparingly soluble compounds, or degree of oxygenation of the organics all seem to play a role [ Petters et al., 2009b ].”