stratospheric ozone depletion

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• Ozone depletion — Image of the largest Antarctic ozone hole ever recorded (September 2006) Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth s… …   Wikipedia

• ozone depletion — /oʊzoʊn dəˈpliʃən/ (say ohzohn duh pleeshuhn) noun a decline in the amount of ozone in the earth s stratosphere. Ozone depletion occurs in the stratosphere in response to the breakdown of compounds such as chlorofluorocarbons containing chlorine… …  

• Scientific Assessment of Ozone Depletion — The Scientific Assessment of Ozone Depletion is a sequence of reports sponsored by WMO/UNEP. The most recent is the [http://www.wmo.int/pages/prog/arep/gaw/ozone 2006/ozone asst report.html 2006 report] .The reports were set up to inform the… …   Wikipedia

• Ozone-oxygen cycle — in the ozone layer. The ozone oxygen cycle is the process by which ozone is continually regenerated in Earth s stratosphere, all the while converting ultraviolet radiation into heat. In 1930 Sydney Chapman resolved the chemistry involved. The… …   Wikipedia

• Ozone layer — The ozone layer is a layer in Earth s atmosphere which contains relatively high concentrations of ozone (O3). This layer absorbs 97–99% of the Sun s high frequency ultraviolet light, which is potentially damaging to the life forms on Earth.[1] It …   Wikipedia

• ozone — /ˈoʊzoʊn / (say ohzohn) noun 1. Chemistry a form of oxygen, O3, with a peculiar smell, having three atoms to the molecule, which is produced when an electric discharge is passed through air or oxygen. It is present in the upper atmosphere and… …  

• ozone layer — /ˈoʊzoʊn leɪə/ (say ohzohn layuh) noun a region in the outer portion of the stratosphere, where atmospheric ozone (O3) is concentrated. Also, ozonosphere. The ozone layer is the layer of ozone which settles at between 15 and 30 kilometres… …  

• ozone — noun ADJECTIVE ▪ atmospheric, ground level, stratospheric VERB + OZONE ▪ deplete, destroy ▪ form, produce …   Collocations dictionary

• Polar stratospheric cloud — Antarctic stratospheric cloud (nacreous clouds) Abbreviation PSC Altitude 15,000–25,000 m (50,000–80,000 ft) …   Wikipedia

• Montreal Protocol — For other similarly named agreements, see Montreal Convention (disambiguation). The largest Antarctic ozone hole recorded as of September 2006 The Montreal Protocol on Substances That Deplete the Ozone Layer (a protocol to the Vienna Convention… …   Wikipedia

• Antarctica — /ant ahrk ti keuh, ahr ti /, n. the continent surrounding the South Pole: almost entirely covered by an ice sheet. ab. 5,000,000 sq. mi. (12,950,000 sq. km). Also called Antarctic Continent. * * * Antarctica Introduction Antarctica Background:… …   Universalium