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Volume 165, 2013
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Contact freezing efficiency of mineral dust aerosols studied in an electrodynamic balance: quantitative size and temperature dependence for illite particles

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Abstract

Contact freezing has long been discussed as a candidate for cloud ice formation at temperatures warmer than about −25 °C, but until now the molecular mechanism underlying this process has remained obscure and little quantitative information about the size and temperature dependent contact freezing properties of the various aerosol species is available. In this contribution, we present the first quantitative measurements of the freezing probability of a supercooled droplet upon a single contact with a size selected illite mineral particle. It is found that this probability is a strong function of temperature and aerosol particle size. For the particles investigated and on the minute time scale of the experiment, contact freezing indeed dominates immersion freezing for all temperatures.

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Article information


Submitted
08 Mar 2013
Accepted
19 Mar 2013
First published
19 Mar 2013

Faraday Discuss., 2013,165, 383-390
Article type
Paper

Contact freezing efficiency of mineral dust aerosols studied in an electrodynamic balance: quantitative size and temperature dependence for illite particles

N. Hoffmann, D. Duft, A. Kiselev and T. Leisner, Faraday Discuss., 2013, 165, 383
DOI: 10.1039/C3FD00033H

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