Ozone Depletion© Copyright NewPath Learning. All Rights Reserved. 94-4573Visit www.newpathlearning.com for Online Learning Resources.Ozone concentrations observed over Antarctica since 1979Other sources of pollutionA Thinning Ozone LayerThe ozone layer in the stratosphere protects the Earth from harmful ultraviolet radiation. In the 1970s scientists noticed a thinning layer of ozone over Antarctica. Human-produced chemicals called (CFCs) were the primary cause of this ozone depletion. Ozone Layer RecoveryThrough an international effort, the production and use of CFCs has decreased, but the ozone layer may not recover for many years. This is just one example of how the Earth’s atmosphere.Ozone(Dobson Units)905501979Antarcticaozone layerozone layerUV radiation(km)6005001009080706050403020100stratosphere19791988199820082011Some photos courtesy of USDOT & NASA.CFC sourcesOzone concentttrrrrrrrrrraaaaaaaaaattttttttttttttiiiiiiioooooonnnsssssssss oooooooooooooobbbbbbbbbbservedddddddddddddd ooooooooooooover AAAnnnnnnnnnnnttttttttttttaaaaaaaaaaaaaaarrrrctica since 1979Other sources of pollutionThe ozone layer in the stratosphere protects the Earth from harmful ultravioooooooooollllllllllllleeeeeeeeeeeeeeetttttttttttt rrrrrrrrrrrrrradiation. IIIIIIIIIIInnnnnnnnnnnnnnnn tttttttttttthhhhhhhhhhhhhhheeeeeeee 19777777777777770000000000000000000000sssssssssssssss scientists noticed a thinning layer of ozone over Antarctica. Human-producccccccccceeeeeeeeeeeeeeddddddddddddddd cccccchhhhhhhhhhhhhhhhheeeeeeeeeeeeeeemmmmmmmmmmmmmmicals called (CFCs) were the primary cause of this ozone depletiiiiiiiiiioooooooooooooooonnnnnnnnnnnnnnnnn....Through an internationallllllll eeeeeeeeeeeeeffffffffffffffffffffffffffffffoooooooooooorrrrrt, tttttttttttthhhhhhhhhhhhhhhhhhhheeeeeeeeeee pppppppppppproduction and useeeeeeeee of CFCs has decreaaaaaaaasssssssssssssseeeeeeeeeeeeeddddddddddddddddddd,,,,,,,,, bbbbbut thhhhhhhheeeeeee ooooooooooooozzzzzzzzzzzzzoooooooooneeeeeeeeee llllllllllllaaaaaaaaaaaaayyyyyyyyyyyyyer may not recover for manyyyyyyyyyyyyy yyyyyyyyyyyyyyeaaaaaaaaaaaarrrrrrrrrrrrrsssss. TTTTTTTTTTTTTTTThhhhhhhhhhhhhhhhhiiiiiiiiiiiissssss is justttttt ooooooooooooonnnnnnnnnnnnnnneeeeeeeeeeeeee exxxxxxxxxaaaaaaaaample of how the Earth’s atmmmmmmmmmmmmmmmmmoosspppppppppppppppphhhhhhhhhhhhhheeeeeeeeeerrrrrrrrrrrrreeeeee.Ozone(Dobson Units)905501979AAAAAntarcticaAoz lalalaozzzzzoooooooooooonnnnnnnnneeeeee loz laayyyyyyyyyyyyyyyyeeeeeeeeeeeeeerlalaozone layerUV radiation(km)6005001009080706050403020100eerereererstratospheh197911199999999999888888888888888881111111999999999999820082011CFCCCCCCCC ssssssssssoooooooooourcceeeeeeeeeeeeessssssssssss
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