- Meteorol. the layer of the upper atmosphere where most atmospheric ozone is concentrated, from about 8 to 30 mi. (12 to 48 km) above the earth, with the maximum ozone concentration occurring at an altitude of about 12 mi. (19 km). Also called ozonosphere /oh zoh"neuh sfear'/.
* * *or ozonosphereRegion in the upper atmosphere, about 6–30 mi (10–50 km) high, with significant concentrations of ozone, formed by the effect of solar ultraviolet (UV) radiation on oxygen and also present in trace quantities elsewhere in earth's atmosphere.Ozone strongly absorbs solar UV radiation, causing atmospheric temperature to climb to about 30°F (0°C) at the top of the layer, and preventing much of this radiation from reaching earth's surface, where it would injure many living things. Chlorofluorocarbons, or CFCs, and some other air pollutants that diffuse into the ozone layer destroy ozone. In the mid-1980s, scientists discovered that a "hole"an area where the ozone is up to 50% thinner than normaldevelops periodically in the ozone layer above Antarctica. This severe regional depletion, explained as a natural seasonal depletion, appears to have been exacerbated by the effects of CFCs, and may have led to an increase in skin cancer caused by UV exposure. Restrictions on the manufacture and use of CFCs and other ozone-destroying pollutants were imposed in 1978.
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ozone layer — ozone ,layer noun singular a layer of OZONE in the Earth s atmosphere that protects the Earth from the heat of the sun. Pollution in the air has caused holes to appear in the ozone layer … Usage of the words and phrases in modern English
ozone layer — ozone .layer n [singular] a layer of gases in the sky that prevents harmful ↑radiation from the sun from reaching the Earth ▪ the hole in the ozone layer … Dictionary of contemporary English
ozone layer — UK US noun [S] ► ENVIRONMENT a layer of air high above the Earth that contains ozone (= a form of oxygen) and that prevents harmful light from the sun from reaching the Earth … Financial and business terms
ozone layer — ► NOUN ▪ a layer in the earth s stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun … English terms dictionary
ozone layer — or ozonosphere n. the atmospheric layer within the stratosphere, extending from a height of c. 15 to c. 30 km ( c. 9 to c. 18 mi) and having a heavy concentration of ozone: it absorbs dangerous ultraviolet radiation from the sun and serves to… … English World dictionary
ozone layer — n. A portion of the atmosphere surrounding the Earth that contains a high concentration of ozone, a molecule that plays an important role in absorbing excess ultraviolet radiation from the sun. The Essential Law Dictionary. Sphinx Publishing, An… … Law dictionary
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. It … Wikipedia
ozone layer — noun a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun • Syn: ↑ozonosphere • Hypernyms: ↑layer • Part Holonyms: ↑stratosphere • Part Meronyms … Useful english dictionary
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… … Australian English dictionary
ozone layer — N SING: usu the N The ozone layer is the part of the Earth s atmosphere that has the most ozone in it. The ozone layer protects living things from the harmful radiation of the sun … English dictionary