Mesosphere stratosphere troposphere.

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Presentation transcript:

mesosphere stratosphere troposphere

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.

Where is ?

Electromagnetic Spectrum BACK

The Hole in the Ozone layer Area over South Pole where ozone (O3) loss (called “depletion”) exceeds 50 % Happens every Sept., Oct. 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: You do not need to write this down. CCl2 F2 + 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

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