Activation of Atmospheric Particles as Ice Nuclei in Cold and Dry Air

N. Fukuta Radiophysics Laboratory, CSIRO, Sydney, Australia

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Abstract

Ice nucleation and subsequent phase equilibrium in water held in the micro-capillaries of atmospheric particles are examined. It is found that ice formed in the micro-capillaries of certain particles may exist in equilibrium with a dry atmosphere, where particles preactivated by Fournier's effect are expected to lose their activity. A possible mechanism of activation of the particles as ice nuclei in a cold dry atmosphere is suggested.

Abstract

Ice nucleation and subsequent phase equilibrium in water held in the micro-capillaries of atmospheric particles are examined. It is found that ice formed in the micro-capillaries of certain particles may exist in equilibrium with a dry atmosphere, where particles preactivated by Fournier's effect are expected to lose their activity. A possible mechanism of activation of the particles as ice nuclei in a cold dry atmosphere is suggested.

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