The Ozone Hole. Tejas Patel PEP Universität Bremen. Contents. History of Ozone Loss Chemical processes in Ozone depletion Regions of Interest Polar Vortex Ozone hole only at poles??? Anthropogenic Impacts on Ozone hole Health Consequences Summary Referances. History of Ozone Loss.
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History of Ozone Loss
Chemical processes in Ozone depletion
Regions of Interest
Ozone hole only at poles???
Anthropogenic Impacts on Ozone hole
Loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970s by British Antarctic Survey (BAS).
Chlorine, bromine – from human activities
Chlorine carriers – hydrochloric acid, chlorine nitrate
Other compounds – nitric acid, dinitrogen pent oxide
Denoxification – slows removal ClO
Antarctic stratosphere cools
descends closer to the surface
Coriolis effect - sets up strong westerly circulation
temperatures - lower stratosphere cool < -80C PCS’s
Mostly in the lower stratosphere
persists two months
nearly all the ozone is depleted
area the size of Antarctica
most pronounced in spring/October
Arctic – ‘low ozone event’
Arctic atmosphere, as result of the eruption of Mt Pinatubo
European ozone hole - heavily populated northern mid-latitudes (30-60N) – formation smaller, much slower
Impact of CFC’s