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Uploaded on Tuesday 21 Feb 2012 by GRID-Arendal

The colder Antarctic winter drives formation of the hole in the south

Year: 2007
From collection: Vital Ozone Graphics
Author: Emmanuelle Bournay, UNEP/GRID-Arendal
Description:
The air inside the Antarctic polar vortex is much colder than midlatitude air. “When temperatures drop below -78°C, thin clouds form of ice, nitric acid, and sulphuric acid mixtures. Chemical reactions on the surfaces of ice crystals in the clouds release active forms of CFCs. Ozone depletion begins, and the ozone “hole” appears.
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