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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.
2010 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 10, no 16, 7945-7961 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 mean radii of 1.0, 1.7, and 2.9 μ1/4m. 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 0.031 ± 0.001, while that for water evaporation was 0.054 ± 0.012. 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
2010. Vol. 10, no 16, 7945-7961 p.
Research subject
Space Technology
URN: urn:nbn:se:ltu:diva-15670DOI: 10.5194/acp-10-7945-2010Local ID: f368f610-c262-11df-a707-000ea68e967bOAI: diva2:988645
Validerad; 2010; 20100917 (andbra)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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