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Unformatted text preview: Topic/Stat_Ozone_Loss(nat) Source: http://www.ipcc.ch/ 8 49 Ozone Is Not “Just Oxygen!” 50 Ozone is more chemically active than oxygen. Ozone is a pale blue gas. Ozone has a distinctive smell. Ozone has the ability to absorb/block ultraviolet light. Ozone is an extremely poisonous, corrosive gas (and has been used as a disinfectant, in water purification, and as a bleach) that damages and kills vegetation. In the stratosphere, ozone is vital to our planet’s survival. In the upper atmosphere, ozone is produced by a natural process and forms a layer that protects us from ultraviolet radiation. At ground level, ozone is a dangerous pollutant (part of smog). Source: http://www.epa.gov/oar/oaqps/gooduphigh/ 51 Making Good Ozone… 52 …And Making It Better Source: http://www.meto.umd.edu/~bruce/m1239702.html Source: http://www.meto.umd.edu/~bruce/m1239702.html 53 54 The Problem: CFCs and Friends A variety of humancreated chemicals, including solvents, packaging materials, industrial cleaners, and fire extinguishers, contain chlorofluorocarbons (CFCs) or related chemicals (HCFCs, carbon tetrachloride, methyl chloroform, etc.). When CFCs interact with ozone in the stratosphere, the results aren’t pretty Source: http://www.epa.gov/oar/oaqps/gooduphigh/ Breaking Up Is Hard ... 1 2 3 4 Source: http://www.meto.umd.edu/~bruce/m1239702.html 9 55 … And It Keeps Getting Worse 5 Cold Clouds During winter stratospheric winds form a vortex around the South Pole. Within the vortex the atmosphere over the pole is effectively isolated, temperatures are extremely cold (-80ºC), and unusual polar stratospheric clouds form. Chlorine from CFCs is stored on the clouds during the long polar night, and then released to attack ozone when the sun returns in spring. 6 Source: http://www.meto.umd.edu/~bruce/m1239702.html 57 56 The Results for the Planet Sources: http://svs.gsfc.nasa.gov/imagewall/solve.html; http://zebu.uoregon.edu/1997/ph161/l15.html ; htt // i / /004/004 l ht 58 Ozone Hole • Total Ozone Mapping Spectrometer (TOMS) on the Earth Probe satellite shows the growth of the ozone hole over...
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This note was uploaded on 12/16/2010 for the course GEOG 102 taught by Professor Osborn during the Fall '10 term at San Diego State.

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