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G3.9-3.11: CFCs, ozone and the effects of UV - review

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Dr Speller

on 2 October 2012

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Transcript of G3.9-3.11: CFCs, ozone and the effects of UV - review

Ultraviolet (UV) radiation CFCs, ozone and the effects of UV radiation 20km thick
formed when oxygen breaks down and reacts with other oxygen molecules to form ozone (03)
Absorbs 93% of all UV radiation In 1985, holes were found in the ozone layer over Anarctica It is now agreed that chlorofluorocarbons (CFCs) were the cause of the ozone hole. Aerosols Refrigerants Polystyrene CFCs breakdown in stratosphere to form atoms of chlorine, which react with ozone to form oxygen and chlorine monoxide. A chain reaction occurs as chlorine monoxide reacts with more ozone molecules forming more oxygen and chlorine. Effects of UV radiation on animals:

Causes DNA mutation leading to skin cancer
Has been linked to eye damage e.g. cataracts Effects of UV radiation on plants:

DNA damage restricting plant growth and productivity
Photosynthesis inhibited resulting in lower productivity Plants at high altitudes (e.g. in the Andes) have evolved mechanisms to protect themselves from UV radiation. Plankton and aquatic plants are more affected by UV - this can have a huge affect on food chains and entire ecosystems...
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