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CHEM 304 – 2/3/12

CHEM 304 – 2/3/12. I.B. Stratospheric chemistry: Ozone - History and observations - The Chapman Mechanism (Embedded Fundamentals) - Chemical Kinetics - Rate Laws & Rates > READ CH 1 > Quiz 1 TODAY !!!. Stratospheric Chemistry: O 3 is the point here….

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CHEM 304 – 2/3/12

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  1. CHEM 304 – 2/3/12 I.B. Stratospheric chemistry: Ozone - History and observations - The Chapman Mechanism (Embedded Fundamentals) - Chemical Kinetics - Rate Laws & Rates > READ CH 1 > Quiz 1 TODAY!!!

  2. Stratospheric Chemistry: O3 is the point here… There are three ATM functions of O3: 1) UV filter, 2) Heats the stratosphere, 3) tropospheric pollutant

  3. Brief Ozone History • 1840 - Discovered by Schönbein- (Oziene = “to smell”) • 1881 - Hartley - main UV Band • 1930 - Chapman - “layer chemistry” • 1931 - Dobson - measured column thickness (1 D.U. = 0.01 mm)

  4. The Ozone “Layer” - it is not a “layer”

  5. O3 is a UV Filter: Hartley band protects biological organisms Threshold wavelength

  6. O3 Heats the Stratosphere O3 + h —> O2 + O O2 + O —> O3 + heat

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