alexa Surface crystallization of supercooled water in clouds.
Environmental Sciences

Environmental Sciences

Journal of Climatology & Weather Forecasting

Author(s): Tabazadeh A, Djikaev YS, Reiss H

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Abstract The process by which liquid cloud droplets homogeneously crystallize into ice is still not well understood. The ice nucleation process based on the standard and classical theory of homogeneous freezing initiates within the interior volume of a cloud droplet. Current experimental data on homogeneous freezing rates of ice in droplets of supercooled water, both in air and emulsion oil samples, show considerable scatter. For example, at -33 degrees C, the reported volume-based freezing rates of ice in supercooled water vary by as many as 5 orders of magnitude, which is well outside the range of measurement uncertainties. Here, we show that the process of ice nucleus formation at the air (or oil)-liquid water interface may help to explain why experimental results on ice nucleation rates yield different results in different ambient phases. Our results also suggest that surface crystallization of ice in cloud droplets can explain why low amounts of supercooled water have been observed in the atmosphere near -40 degrees C.
This article was published in Proc Natl Acad Sci U S A and referenced in Journal of Climatology & Weather Forecasting

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