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Size dependence of volume and surface nucleation rates for homogeneous freezing of supercooled water droplets
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0003-3701-7925
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 (engelsk)Inngår i: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 11, nr 6, s. 2853-2861Artikkel i tidsskrift (Fagfellevurdert) 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

sted, utgiver, år, opplag, sider
2011. Vol. 11, nr 6, s. 2853-2861
HSV kategori
Forskningsprogram
Rymdteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-3719DOI: 10.5194/acp-11-2853-2011Scopus ID: 2-s2.0-79953197216Lokal ID: 18d39601-0447-4cf9-a2d6-7581eb1de76bOAI: oai:DiVA.org:ltu-3719DiVA, id: diva2:976579
Merknad
Validerad; 2011; 20110426 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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