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ENV100Y5 (900)
Lecture 1

ENV100Y5 Lecture Notes - Lecture 1: Polar Vortex, Ozone Depletion, Bromine

Course Code
Barbara Murck

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Conditions at the South Pole facilitate ozone depletion
Polar vortex
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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