lec 6 - Clouds are the Earth's Blanket VI - 1 The Chemistry...

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VI - 1 Clouds are the Earth’s Blanket
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VI - 2 The Chemistry of Stratospheric Ozone Depletion • Chemistry and Photochemistry in the Stratosphere • The Antarctic Ozone Hole • Molecular Beam/Laser Spectroscopic Studies of Photochemistry
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VI - 3 Nations meet in Montreal to discuss global agreement on banning CFC chemicals, not usually done except for chemical warfare ageints. CFC's are in everyone's home already, so they're not killing anyone right now. Rush Limbaugh says it's a fraud, a scientific consipracy, grant grubbing, and government just interfering with our lives. What's going on? An otherwise arcane area of chemistry catapulted into international prominence. A combination of lab measurements, satellite data, plane flights, and physical chemistry is needed to piece the puzzle together of why ozone is being lost. Ozone in the News
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VI - 4 A Problem with No National Boundaries Air Conditioner Repair Man Arizona says CFC’s are OK CFC’s smuggled in from Mexico, which also OK’s CFC’s
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VI - 5 The Ozone Shield Less than 0.5% of Earth’s Radius; Protects all life on earth
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VI - 6 Temperature Profile in the Atmosphere Troposphere T decreases with increasing altitude; Adiabatic cooling as density gets lower Minimum defines tropopause Stratosphere T increases with increasing altitude; Due to absorption of sunlight by ozone From 15-60 km
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VI - 7 O 2 , Dioxygen Octet on each atom Stable Ozone, O 3 Non-octet O=O O-O=O 21% of atmosphere 4 times weaker bond Reactive and caustic . . •• •• ••
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VI - 8 Ozone Absorption Spectrum Absorbs light between 220 and 300 nm N 2 and O 2 do not absorb at those wavelengths Protects DNA from UV light and damage
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VI - 9 Chapman Cycle: 1930’s Light absorption breaks the O-O bond in ozone Forms O In presence of a third body, forms O 3 again Does NOT explain ozone hole Ozone Destruction Ozone Formation .
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