ENV100Y5 Lecture Notes - Lecture 1: Polar Vortex, Ozone Depletion, Bromine
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Conditions at the South Pole facilitate ozone depletion
•Unimpeded circulation of very cold air
•Tiny ice crystals in stratospheric clouds provide sites for ozone-destroying
•Arctic ozone depletion is not as severe
•Not as cold
•Polar vortex not as well defined
Ozone-depleting substances come from many sources
•CFCs come from many industrial processes:
•Refrigerants (Freon), aerosol propellants, cleaning solvents, Styrofoam, etc.
•(CFCs are also greenhouse gases)
•Other halogens also facilitate ozone depletion, especially bromine
•Many sources –fire retardants, pesticides, dyes, etc.
•Nitrous oxide and other chemicals also facilitate ozone depletion
Experts agree that ozone depletion…
•allows more UV radiation to reach the surface;
•has occurred over the South Pole, more than over the North Pole or mid-
•is increasing in intensity;
•is increasing in geographic area;
•is facilitated by conditions in the polar vortex;
•is facilitated by the presence of catalysts, including CFCs.
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