What is Ozone? - Chemical Formula is O3

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Presentation transcript:

What is Ozone? - Chemical Formula is O3 - Found in the Stratosphere (good) and Troposphere (bad). - Stratosphere ozone protects Earth from the Sun’s ultraviolet radiation.

mesosphere stratosphere troposphere

Where is ? --

Electromagnetic Spectrum BACK

The Hole in the Ozone layer - Area over South Pole where ozone (O3) loss (called “depletion”) exceeds 50 % Happens in Sept., Oct. and Nov. since 1980s

Dobson Units - The Dobson unit measures Ozone thickness at standard temperature and pressure.

Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec.

The destructive chemistry: Chemical Equations showing destruction by Chloroflurocarbons (CFC). • CCl2 F + light ---> Cl + CClF2 • Cl + O3 ---> ClO + O2 • ClO + O ---> Cl + O2 Rowland and Molina 1974 paper Nobel Prize 1995

- Uses of CFCs. Refrigerators, freezers: 15 % (FREON) Air conditioners in cars and homes: 20 % Aerosols: 15 % Foams: 24 %

Next Rowland and Molina