11. CFCs and Ozone

11. CFCs and Ozone - Prof. Turner The Earth Transformed...

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Prof. Turner The Earth Transformed 10.4.07 I) CFCs, Ozone & the Montreal Protocol - Synthetics: Not matching nature; going beyond it 1) Ozone [O 3 ] a An uncommon molecule of oxygen – a natural element produced and destroyed at a rate of about 300 million tons per day in the stratosphere. b In the stratosphere, the ozone layer protects us from UV radiation: sunburn, c In the troposphere, ozone damages the lungs and is harmful to plants d Ozone is produced by the reaction of molecular oxygen to ultraviolet light. (i) UV light collides with oxygen molecule, releasing two oxygen atoms which combine with oxygen molecules to create ozone (ii) Ozone absorbs UV radiation but breaks up into oxygen atom and oxygen molecule and the process is repeated (iii) On balance 3 molecules of O 3 for 10 million air molecules, but enough to absorb UV Chlorofluorocarbons Stable compounds that migrate to the stratosphere. Ultraviolet light breaks up CFCs releasing chlorine atoms.
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This note was uploaded on 04/24/2008 for the course GEOG 180 taught by Professor Turner during the Fall '08 term at Clark University.

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11. CFCs and Ozone - Prof. Turner The Earth Transformed...

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