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ozone layer

The layer between 10 and 50 km that contains most atmospheric ozone, with the greatest concentration at altitudes of 20–25 km. It absorbs most of the energy from ultraviolet radiation from ...

ozone layer

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A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

... layer A term commonly used to refer to the layer of ozone found in the stratosphere, a region of the Earth’s atmosphere that begins approximately 10 km above the Earth’s surface and extends up to approximately 50 km. Ozone is also found in the troposphere, the layer between the Earth’s surface and the stratosphere. The majority of the ozone in the Earth’s atmosphere is located in the stratosphere. In the stratosphere, the ozone layer is thinnest around the equator and denser towards the...

ozone layer

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A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
237 words

...ozone layer ( ozonosphere ) A layer of the earth’s atmosphere in which most of the atmosphere’s ozone is concentrated. It occurs 15–50 km above the earth’s surface and is virtually synonymous with the stratosphere . In this layer most of the sun’s ultraviolet radiation is absorbed by the ozone molecules, causing a rise in the temperature of the stratosphere and preventing vertical mixing so that the stratosphere forms a stable layer. By absorbing most of the solar ultraviolet radiation, the ozone layer protects living organisms on earth. The fact that...

ozone layer

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A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... layer The atmospheric layer at 15–30 km altitude, in which ozone (O 3 ) is concentrated at 1–10 parts per million. Ozone also occurs in very low concentration at altitudes of 10–15 km and 30–50 km. Generally, atmospheric ozone is produced by the photochemical dissociation of oxygen (O 2 ), resulting from absorption of ultraviolet solar radiation, to form atoms of oxygen (O). These atoms collide with molecular oxygen (O 2 ) to form ozone (O 3 ), which in turn absorbs solar radiation for further dissociation to O and O 2 . The ozone layer limits the amount of...

ozone layer

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A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...ozone layer A layer mainly in the lower stratosphere , at an altitude between about 15 and 40 km, that contains relatively high concentrations (typically 5 parts per million) of ozone that absorbs about 98% of the ultraviolet radiation received from the Sun. A reduction in ozone concentration ( ozone-layer depletion ) is being brought about by pollutants , such as oxides of nitrogen and atomic chlorine and bromine, that result from the decomposition of man-made organohalogens such as chlorofluorocarbons and bromofluorocarbons which used to be widely...

ozone layer

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A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
218 words

... layer ( ozonosphere ) A layer of the earth’s atmosphere in which most of the atmosphere’s ozone is concentrated. It occurs 15–50 km above the earth’s surface and is virtually synonymous with the stratosphere. In this layer most of the sun’s ultraviolet radiation is absorbed by the ozone molecules, causing a rise in the temperature of the stratosphere and preventing vertical mixing so that the stratosphere forms a stable layer. By absorbing most of the solar ultraviolet radiation the ozone layer protects living organisms on earth. The fact that the ozone...

ozone layer

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World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
84 words

... layer Region of Earth's atmosphere in which ozone (O 3 ) is concentrated. It is most dense at altitudes of 21 to 26km (13 to 16mi). Produced by ultraviolet radiation in incoming sunlight, the ozone layer absorbs much of the ultraviolet, thereby shielding the Earth's surface. Aircraft, nuclear weapons, and some aerosol sprays and refrigerants yield chemical agents that can break down high-altitude ozone, which could lead to an increase in the amount of harmful ultraviolet radiation reaching the Earth's surface. See also chlorofluorocarbon...

ozone layer

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A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
261 words

...ozone layer ( ozonosphere ) A layer of the earth’s atmosphere in which most of the atmosphere’s ozone is concentrated. It occurs 15–50 km above the earth’s surface and is virtually synonymous with the stratosphere . In this layer most of the sun’s ultraviolet radiation is absorbed by the ozone molecules, causing a rise in the temperature of the stratosphere and preventing vertical mixing so that the stratosphere forms a stable layer. By absorbing most of the solar ultraviolet radiation the ozone layer protects living organisms on earth. The fact that the...

ozone layer

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A Dictionary of Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2008

... layer The layer between 10 and 50 km that contains most atmospheric ozone , with the greatest concentration at altitudes of 20–25 km. It absorbs most of the energy from ultraviolet radiation from the Sun, and thus acts as a protective shield for life on the Earth's surface. The energy absorbed causes the rise in temperature with height that occurs in the stratosphere . It has recently been established that solar proton events ( see solar wind ) may cause transient decreases in ozone concentrations by c. 10 per cent and a simultaneous increase in...

ozone layer

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A Dictionary of Economics (5 ed.)

Reference type:
Subject Reference
Current Version:
2017
Subject:
Social sciences, Economics
Length:
95 words

...ozone layer A layer of the stratosphere protecting the Earth’s surface from harmful radiation. Depletion of this layer is believed to be caused by human activities, the use of chlorofluorocarbons ( CFCs ), halon, and other chemicals releasing chlorine molecules which, with a delay of around a decade, affect the stratosphere. Control of emissions requires global agreement, since each user of CFCs benefits from its own activities while most of the resulting damage affects the world as a whole. An agreement to replace CFCs and halon was reached in 1987 in...

ozone layer

ozone layer   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Earth Sciences and Geography
Length:
1,592 words
Illustration(s):
1

... layer Ozone is a blue-green poisonous gas that is composed of three oxygen atoms (O 3 ). It occurs in trace amounts throughout most of the atmosphere but it is most abundant in the stratosphere. Here, there is a thin layer between 15 and 40km altitude with a maximum concentration at around 25km (Fig.1). This ozone layer is believed to be most important to life on Earth because ozone absorbs the most carcinogenic part of the solar spectrum. This fraction of the solar spectrum has the wavelength range 280 to 315 nm and is referred to as ultraviolet-B (UV-B)....

ozone layer

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A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... layer The layer of ozone in the stratosphere that is formed naturally by a photochemical reaction with solar ultraviolet radiation . Ozone is constantly being formed, broken down, and re‐formed above about 40 km, and it sinks and accumulates at the 20–30 km level. The ozone layer is not uniform around the world; it varies in density, being least dense over the equator, where ozone does not accumulate, and most dense over high latitudes (beyond 50°N and 50°S). In latitudes higher than 60° the ozone concentration decreases during winter, when fresh...

ozone layer

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A Dictionary of Public Health (2 ed.)

Reference type:
Subject Reference
Current Version:
2018

...ozone layer A stratospheric region at an altitude of approximately 20–24 km above the earth's surface, where ionized solar radiation converts oxygen to ozone. Ozone acts as a filter that helps to reduce the intensity of short-wave ultraviolet (UV) flux that penetrates to the lower levels of the biosphere, and in this way provides protection to all living things from the potentially lethal damage that would be done if larger concentrations of UV radiation reached the earth's surface. ...

ozone layer

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A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
241 words
Illustration(s):
4

... layer The stratospheric layer at 20–30 km altitude, in which ozone (O 3 ) is concentrated at 1–10 parts per million (220–460 DU). Ozone also occurs in very low concentrations at altitudes of 10–15 km and 30–50 km. The highest ozone concentration is found at about 30 km over the equator and about 18 km over the poles. Atmospheric ozone is produced by the photochemical dissociation of oxygen (O 2 ), resulting from the absorption by oxygen molecules of ultraviolet radiation ( UV ) at a wavelength of 240 nanometres and an energy of 5.16 electron volts (known...

ozone-layer chemistry

ozone-layer chemistry   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

...-layer chemistry Ozone, a gas composed of three oxygen atoms (O 3(g) ), protects the Earth's surface from harmful ultraviolet radiation from the Sun. More than 90 per cent of the ozone in the atmosphere resides in the upper atmosphere, the stratosphere. Ozone is formed as a result of the dissociation of molecular oxygen by ultraviolet radiation in the stratosphere to generate oxygen free radicals (O • ): O 2(g) + energy → O • + O • . These free radicals may then combine with another molecule of oxygen to form ozone: O 2(g) + O • + M → O 3(g) + M, where...

Ozone Layer, Convention for the Protection of

Ozone Layer, Convention for the Protection of   Reference library

Encyclopaedic Dictionary of International Law (3 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
Law, International Law
Length:
290 words

...9/12, Annex IV ), and the Beijing Amendment of 3 December 1999 . See UNEP, Handbook for the Vienna Convention for the Protection of the Ozone Layer (7th ed.); UNEP, Handbook for the Montreal Protocol on Substances that Deplete the Ozone Layer (7th ed.). See < http://ozone.unep.org >. See also Yoshida , The International Legal Regime for the Protection of the Stratospheric Ozone Layer ( 2001 ); Bankobeza , Ozone Protection: The International Legal Regime ( 2005 ). And see Climate Change Convention...

Montreal Protocol on Substances That Deplete the Ozone Layer

Montreal Protocol on Substances That Deplete the Ozone Layer (16 September 1987)   Reference library

Vaneesha JAIN

Berkshire Encyclopedia of Sustainability

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Social sciences
Length:
1,301 words

... The Ozone Hole. (2007). The Montreal Protocol on Substances that Deplete the Ozone Layer. Retrieved September 18, 2010, from http://www.theozonehole.com/montreal.htm Ozone Secretariat. (2009). Handbook for the Montreal Protocol on Substances that Deplete the Ozone Layer (8th ed.). United Nations Environment Programme (UNEP). Retrieved September 19, 2010, from http://ozone.unep.org/Publications/MP_Handbook/MP-Handbook-2009.pdf United Nations Development Programme (UNDP). (n.d.). Phasing out ozone depleting substances and...

Vienna Convention for the Protection of the Ozone Layer (1985)

Vienna Convention for the Protection of the Ozone Layer (1985)   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

...Convention for the Protection of the Ozone Layer (1985) An international agreement designed to minimize human destruction of the ozone layer by reducing the production and emission of CFCs and other ozone-depleting substances into the atmosphere. The Montreal Protocol fits within the framework of this...

Montreal Protocol on Substances that Deplete the Ozone Layer (1987)

Montreal Protocol on Substances that Deplete the Ozone Layer (1987)   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

...Protocol on Substances that Deplete the Ozone Layer (1987) ( Montreal Protocol ) An international protocol that was drawn up in 1987 and came into force in 1989 to protect the ozone layer in the stratosphere from depletion. It built upon the Vienna Convention for the Protection of the Ozone Layer ( 1985 ) and governs the phasing out of production and use of ozone‐depleting substances such as CFCs . The 39 signatory countries agreed to freeze production of CFCs at 1986 levels, and to decrease production by 20% by 1993 and by half by ...

ozone layer

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Pocket Oxford-Hachette French Dictionary: English-French (4 ed.)

Reference type:
Bilingual Dictionary
Current Version:
2012
Subject:
Bilingual dictionaries
Length:
6 words
ozone layer

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Pocket Oxford Italian Dictionary: English-Italian (4 ed.)

Reference type:
Bilingual Dictionary
Current Version:
2012
Subject:
Bilingual dictionaries
Length:
6 words

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