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Name: Julia
Status: student
Grade: 6-8
Location: AL
Country: USA
Date: Winter 2012

What is the Bergeron process?


Sincere regards, Mike Stewart


Wikipedia has a good description of the Bergeron-Findeisen process at

The Bergeron-Findeisen process of ice crystal growth in cold clouds requires that super-cooled water droplets and ice crystals co-exist in the same cloud. The temperature must be below freezing for ice crystals to form, while at the same time it cannot be too much below freezing for water droplets to form also. Since the equilibrium vapor pressure over water is greater than the saturation vapor pressure over ice at those temperatures, water vapor in the cloud tends to be condensed onto the ice crystals instead of onto the water droplets, and also water evaporates from the water droplets and is condensed onto the ice crystals. Therefore, the ice crystals tend to grow faster than the water droplets.

David R. Cook Meteorologist Climate Research Section Environmental Science Division Argonne National Laboratory

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