An ice nucleus is a particle which acts as the nucleus for the formation of an
ice crystal in the
atmosphere. The presence of ice nuclei increase the temperature that
ice will form in the atmosphere from around −42°C to about −10°C. There are many processes that can take place in the atmosphere to form ice particles, the simplest is by water vapor
subliming directly onto the solid particle. The presence of an ice nucleus can also cause a previously
supercooled water droplet to
freeze through contact, immersion or dissolution within the water that would otherwise have stayed in the liquid phase at a given temperature.
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Any particle that serves as a nucleus in the formation of ice crystals in the atmosphere.
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