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aerosol

aerosol  

A suspension of droplets or particles in a gas; more precisely, of particles with a maximum diameter of 1 μm (fog and mist are thus aerosols). In meteorology, the term is often used to describe the ...
air pollution

air pollution  

The presence in the air of any air pollutant that reduces air quality enough to threaten the health and welfare or people, plants, and animals, to adversely affect materials and structures, and/or to ...
Aura

Aura  

A NASA polar-orbiting satellite, part of the Earth Observing System, the third to be launched (after the Terra and Aqua satellites). Its principal mission is to monitor atmospheric chemistry and ...
carbon tetrachloride

carbon tetrachloride  

Tetrachloromethane, a heavy, colourless liquid, formerly extensively used as a solvent. Because of its significant contribution to the destruction of the ozone layer, its use was discontinued under ...
chlorofluorocarbon

chlorofluorocarbon  

(CFC)Any of various organic compounds primarily consisting of carbon, chlorine, and fluorine, such as trichlorofluoromethane, Cl3CF (CFC-11), and dichlorodifluoromethane, Cl2CF2 (CFC-12). Once used ...
Dobson unit

Dobson unit  

(DU)The unit of measurement used to report the concentration of a gas that is present in the atmosphere or in some part of the atmosphere. It is most often used to measure ozone concentration in the ...
environmental crisis

environmental crisis  

A term that is used to describe the sum of the environmental problems that we face today. Key contemporary environmental problems include the greenhouse effect and global warming, the hole in the ...
global Ozone Monitoring Experiment

global Ozone Monitoring Experiment  

(GOME)An instrument carried by the European satellite ERS-2 for mapping the global ozone layer. Its two-dimensional mapping function was extended to three dimensions by the more sophisticated ...
halocarbon

halocarbon  

An industrial compound containing carbon and a halogen (usually bromine, chlorine, or fluorine) which is commonly used in fire extinguishers. Halocarbons absorb long-wave electromagnetic radiation ...
halon

halon  

A compound obtained by replacing the hydrogen atoms of a hydrocarbon by bromine along with other halogen atoms (see halocarbons), for instance halon 1211 is bromochlorodifluoromethane (CF2BrCl) and ...
hydrofluorocarbon

hydrofluorocarbon  

(HFC)A chemical compound of hydrogen, fluorine, and carbon (also known as a fluorinated hydrocarbon). Unlike chlorofluorocarbons, HFCs contain no chlorine (or bromine), and thus do not destroy ...
hydrogen sulphide

hydrogen sulphide  

A colourless, flammable, toxic natural gas that smells like rotten eggs and is emitted during organic decomposition and produced as a by‐product of oil refining and burning. It is also found in North ...
insolation

insolation  

The amount of energy from the Sun that falls on a surface. The insolation at the top of the Earth's atmosphere is termed the solar constant.
methyl bromide

methyl bromide  

A colorless, odorless volatile gas used as a soil fumigant and insecticide. Human exposure causes irritation of mucosal surfaces, nausea, vomiting; prolonged exposure leads to neurological damage, ...
methyl chloroform

methyl chloroform  

A halogenated hydrocarbon with various industrial uses, but which contributed to destruction of the ozone layer. Under the Montreal Protocol, its use was abolished by January 1996.
Montreal Protocol

Montreal Protocol  

The treaty on ‘Substances that Deplete the Ozone Layer’, drawn up in 1987 by the United Nations Environment Programme (UNEP) to phase out the production and use of various substances, notably the ...
nitrogen dioxide

nitrogen dioxide  

A gas (a nitrogen oxide) that is present in small quantities both near the surface and in the stratosphere. In the lower atmosphere it arises from burning fossil fuels and industrial processes; and ...
oxygen

oxygen  

Reference type:
Overview Page
Syn: O2. The element that constitutes about 20% of the earth's atmosphere and is essential to the metabolism of all air-breathing animals, such as vertebrates, and of course including humans.
oxygen cycle

oxygen cycle  

The cycling of oxygen between the biotic and abiotic components of the environment (see biogeochemical cycle). The oxygen cycle is closely linked to the carbon cycle and the water cycle (see ...
ozonation

ozonation  

The formation of ozone (O3) in the earth's atmosphere. In the stratosphere, about 20–50 km above the surface of the earth, oxygen molecules (O2) dissociate into their constituent atoms under the ...

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