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The Turnbull correlation and the freezing of stratospheric aerosol droplets.

MacKenzie, A. Robert and Laaksonen, Ari and Batris, Evangelos and Kulmala, Markku (1998) The Turnbull correlation and the freezing of stratospheric aerosol droplets. Journal of Geophysical Research: Atmospheres, 103 (D9). pp. 10875-10884. ISSN 0747-7309

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Abstract

An empirical correlation that is important in the calculation of homogeneous freezing probabilities, the “Turnbull correlation” for interfacial tensions, has been reevaluated and applied to systems of interest as possible components of polar stratospheric clouds (PSCs). The systems studied were: sulphuric acid solutions freezing to water ice and sulphuric acid tetrahydrate (SAT); and nitric acid solutions freezing to nitric acid trihydrate (NAT) and nitric acid dihydrate (NAD). The calculations have been compared to experimental data: agreement is generally good, although aerosol freezing experiments, which would rigorously test the theory, have not been made for NAT. Of the three measurements of aerosol freezing to NAD, the calculations are closer to those measurements showing a lower freezing temperature, of about 175–177 K. The comparison substantially improves our confidence in our understanding of the mechanisms of PSC formation. Freezing of stratospheric aerosol to water ice remains the most plausible first step in solid-particle PSC formation if homogeneous freezing is the mechanism by which solid-particle PSC formation occurs.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research: Atmospheres
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21850
Deposited By: ep_ss_importer
Deposited On: 10 Feb 2009 13:53
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21850

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