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Volume nucleation rates for homogeneous freezing in supercooled water microdroplets: results from a combined experimental and modelling approach
Department of Earth and Environmental Sciences, University of Waterloo.
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.
2009 (English)In: Atmospheric Chemistry and Physics Discussions, ISSN 1680-7367, E-ISSN 1680-7375, Vol. 9, no 5, 22883-22927 p.Article in journal (Refereed) Published
Abstract [en]

Temperature-dependent volume nucleation rate coefficients for supercooled water droplets, JV(T), are derived from infrared extinction measurements in a cryogenic laminar aerosol flow tube using a microphysical model. The model inverts water and ice aerosol size distributions retrieved from experimental extinction spectra by considering the evolution of a measured initial droplet distribution via homogeneous nucleation and the exchange of vapour-phase water along a well-defined temperature profile. Experiment and model results are reported for supercooled water droplets with mode radii of 1.0, 1.7, and 2.9 α1/4m. Values of mass accommodation coefficients for evaporation of water droplets and vapour deposition on ice particles are also determined from the model simulations. The coefficient for ice deposition was found to be approximately 0.031, while that for water evaporation was 0.054. Results are considered in terms of the applicability of classical nucleation theory to the freezing of micrometre-sized droplets in cirrus clouds, with implications for the parameterization of homogeneous ice nucleation in numerical models.

Place, publisher, year, edition, pages
2009. Vol. 9, no 5, 22883-22927 p.
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-6046Local ID: 43d21230-ebcc-11de-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-6046DiVA: diva2:978922
Note
Validerad; 2009; 20091218 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-10-19Bibliographically approved

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http://www.atmos-chem-phys-discuss.net/9/22883/2009/

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