Ozone depletion and chlorofluorocarbons (CFCs) | Environmental Chemistry
Автор: Dr. V
Загружено: 2021-04-14
Просмотров: 1330
The ozone layer occurs in the stratosphere, at an altitude of about 25 km. Ozone absorbs much of the radiation between 240 and 310 nm, protecting us from UV radiation. It forms from the reaction of molecular oxygen with the oxygen atoms produced in the upper atmosphere by photodissociation. The photodissociation of ozone reverses the reaction that forms it: so, we have an ozone formation and decomposition cycle. This cycle in the stratosphere is responsible for the rise in temperature that reaches its maximum at the stratopause.
In 1974 Rowland and Molina discovered that chlorine from chlorofluorocarbons (CFCs) may be depleting the supply of ozone in the upper atmosphere by chemical means. Despite a ban on CFCs in over 100 countries, ozone depletion will continue because of the chemical nature of CFCs. Learn more about this in the video :)
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