Mesosphere stratosphere T: Ozone Layer troposphere.

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Presentation transcript:

mesosphere stratosphere T: Ozone Layer troposphere

What is Ozone? Chemical Formula is O3 - Found in the Stratosphere (good) and Troposphere (bad).

Where is ? --

Why is Ozone important? Absorbs and reflects UV rays. Protects you and all other life on earth from UV rays. BACK

How is Ozone Measured? - The Dobson unit measures Ozone thickness at standard temperature and pressure.

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

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

The destructive chemistry: Chloroflurocarbons (CFC) destroy the ozone. Chemical Equation, destruction by 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

Why is the Ozone Layer a success story?