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Twenty Questions and Answers about the Ozone Layer: 2006 Update, Lead Author: D.W. Fahey, Panel Review Meeting for the 2006 ozone assessment.
Uploaded on Tuesday 21 Feb 2012
The colder Antarctic winter drives formation of the hole in the south
Emmanuelle Bournay, UNEP/GRID-Arendal
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.