Ozone hole

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Ozone hole

Definition

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The ozone hole is an annual thinning of the ozone layer over Antarctica, caused by stratospheric chlorine. Other more moderate thinnings have also been called "ozone holes", such as that over the North Pole during certain weather conditions.The discovery of the annual depletion of ozone above the Antarctic was first announced in a paper by Joe Farman, Brian Gardiner and Jonathan Shanklin which appeared in Nature in May 1985.The most pronounced decrease in ozone has been in the lower stratosphere. However, the ozone hole is most usually measured not in terms of ozone concentrations at these levels (which are typically of a few parts per million) but by reduction in the total column ozone, above a point on the earth's surface, which is normally expressed in Dobson units. Marked decreases in column ozone in the Antarctic spring and early summer compared to the early 1970s and before have been observed using instruments such as the Total Ozone Mapping Spectrometer (TOMS). In 2012, it has been reported that the ozone hole had decreased to the smallest size since 2002.

English Wikipedia http://en.wikipedia.org/wiki/Ozone_hole

Spanish wikipedia http://es.wikipedia.org/wiki/Ozone_hole