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US National Oceanic and Atmospheric Administration (NOAA), 2006.
Uploaded on Tuesday 21 Feb 2012
The “Hole”: a result of special weather conditions over the pole repeated every spring
Emmanuelle Bournay, UNEP/GRID-Arendal
The Antarctic continent is circled by a strong wind in the stratosphere which flows around Antarctica and isolates air over Antarctica from air in the midlatitudes. The region poleward of this jet stream is called the Antarctic polar vortex. 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.