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Size dependence of volume and surface nucleation rates for homogeneous freezing of supercooled water droplets
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
Department of Earth and Environmental Sciences, University of Waterloo.
Department of Earth and Environmental Sciences, University of Waterloo.
Department of Earth and Environmental Sciences, University of Waterloo.
2011 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 11, no 6, 2853-2861 p.Article in journal (Refereed) Published
Abstract [en]

The relative roles of volume and surface nucleation were investigated for the homogeneous freezing of pure water droplets. Experiments were carried out in a cryogenic laminar aerosol flow tube using supercooled water aerosols with maximum volume densities at radii between 1 and 3 Î1/4m. Temperature-and size-dependent values of volume-and surface-based homogeneous nucleation rates between 234.8 and 236.2 K were derived using a microphysical model and aerosol phase compositions and size distributions determined from infrared extinction measurements in the flow tube. The results show that the contribution from nucleation at the droplet surface increases with decreasing droplet radius and dominates over nucleation in the bulk droplet volume for droplets with radii smaller than approximately 5 Î1/4m. This is interpreted in terms of a lowered free energy of ice germ formation in the surface-based process. The implications of surface nucleation for the parameterization of homogeneous ice nucleation in numerical models are considered

Place, publisher, year, edition, pages
2011. Vol. 11, no 6, 2853-2861 p.
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-3719DOI: 10.5194/acp-11-2853-2011Local ID: 18d39601-0447-4cf9-a2d6-7581eb1de76bOAI: oai:DiVA.org:ltu-3719DiVA: diva2:976579
Note
Validerad; 2011; 20110426 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Kuhn, Thomas

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