25 Apr '11, 12pm

Ozone Hole Over the Arctic is of Record Proportions | Climate | The Earth Times

Ozone Hole Over the Arctic is of Record Proportions | Climate | The Earth Times

The phenomenon of a ''hole'' in the ozone blanket that covers the earth at polar latitudes was first discovered in 1985 by scientists from the British Antarctic Survey. The ''hole'' was a cylinder of the atmosphere, forming over polar regions, where the level of ozone in the atmospheric column was depleted. Ozone is a compound of oxygen which contains three oxygen atoms. It is unstable and has a half-life in air of twelve hours (meaning that the concentration of ozone will halve every twelve hours unless it is being replenished). Stratospheric ozone is formed when solar radiation splits the oxygen molecule to form two oxygen radicals; these radicals combine with molecular oxygen to form ozone. Ozone is present as a layer throughout the atmosphere at an altitude between 15 and 50 km (the stratosphere) at a concentration of approximately 10ppm with respect to (diatomic) oxyg...

Full article: http://www.earthtimes.org/climate/ozone-hole-over-arctic-...

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