ozone layer depletion
11Ozone depletion potential — The ozone depletion potential (ODP) of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane (R 11 or CFC 11) being fixed at an ODP of 1.0. Chlorodifluoromethane (R 22), for example …
12ozone depletion potential — noun the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC 11. Abbrev.: ODP See chlorofluorocarbon. Chlorine and bromine which deplete ozone in the stratosphere are released from compounds such as… …
13depletion — noun ADJECTIVE ▪ rapid ▪ severe, significant ▪ resource ▪ oil, oxygen, ozone, etc …
14ozone — /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… …
15layer — [[t]le͟ɪə(r)[/t]] ♦♦♦ layers, layering, layered 1) N COUNT: usu with supp, oft N of n A layer of a material or substance is a quantity or piece of it that covers a surface or that is between two other things. A fresh layer of snow covered the… …
16depletion of the ozone — gradual destruction of the ozone layer (region of the stratosphere which contains much of the Earth s atmospheric ozone) …
17ozone — [[t]o͟ʊzoʊn[/t]] N UNCOUNT: oft N n Ozone is a colourless gas which is a form of oxygen. There is a layer of ozone high above the earth s surface. Ozone is best known for its role in screening the Earth from harmful ultraviolet rays from the Sun …
18Scientific 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… …
19Destruction de la couche d'ozone — Image du plus grand trou dans la couche d ozone jamais enregistré (Septembre 2006). La destruction de la couche d ozone décrit deux phénomènes distincts observés depuis la fin des années 1970: a déclin significatif de 4 % tous les décennies… …
20Tropospheric ozone depletion events — During springtime in the polar regions, unique photochemistry convertsinert halide salt ions (e.g. Br ) into reactive halogenspecies (e.g. Br atoms and BrO) that deplete ozone in the boundary layerto near zero levels. Since their discovery in the …
