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Atmospheric nucleation and initial steps of particle growth: Numerical comparison of different theories and hypotheses
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2010 (English)In: Atmospheric research, ISSN 0169-8095, Vol. 98, no 2-4, 229-236 p.Article in journal (Refereed) Published
Abstract [en]

New particle formation in boreal forest environment in Hyytiala Finland was studied in an aerosol dynamical model Basing on the concepts of activation or kinetic collision of two preexisting clusters at 1 5 nm several semi-empirical nucleation rate formulae were parameterized The mechanisms had linear or squared dependence on the concentration of sulphuric acid or a low volatile organic vapor or both and they all showed good agreement with field measurements A new method for examining the power dependence of apparent formation rate (at 2 nm or 3 nm) on sulphuric acid concentration was developed The new method produced exponents 1 6-2 1 for cluster activation and exponents 2 4-3 1 for kinetic collision which suggests that the activation scenarios are in better agreement with experimental observations that imply exponents around 1-2 However, It was found that if low volatile organic vapors with concentrations exceeding that of sulphuric acid are present, they have a major role in shaping the temporal behavior of the apparent formation rates causing error in the exponent analyses Finally, a sensitivity study showed that the analyzed exponents grew even further if the size of the critical cluster was assumed smaller that 1 5 nm

Place, publisher, year, edition, pages
2010. Vol. 98, no 2-4, 229-236 p.
Keyword [en]
Nucleation, Activation, New particle formation
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences; Meteorology
URN: urn:nbn:se:su:diva-51260DOI: 10.1016/j.atmosres.2010.04.007ISI: 000284983400006OAI: diva2:385094
authorCount :9Available from: 2011-01-11 Created: 2011-01-10 Last updated: 2011-01-11Bibliographically approved

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