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Ozone Layer

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  • 1. Ozone O3
  • 2. The Ozone Layer absorbs most of UV light from sun in stratosphere.
  • 3. How ozone is formed UV or lightning splits an oxygen (O2) - these join other O2 to form O3
  • 4. Ozone Eaters1. CFCs (Chlorofluorocarbons): CClF3qcoolants in refrig. & a.c.
  • 5. Breaking apart CFCsqtakes10-20 yrs forCFC molecules toreach stratosphere
  • 6. Breaking apart CFCsq1 Cl atom candestroy 100,000ozonemolecules!
  • 7. The Ozone Holeozone thinning over Antarctica
  • 8. Sept 2006
  • 9. Sept 2007
  • 10. Dec 2007
  • 11. Solar Radiation Types1. UV-A – milding irritating2. UV-B – most harmful to organisms3. UV-C – deadly ; does not reach Earth’s surface
  • 12. Effects of Ozone Thinning1. More UV light passes through, damaging DNA, causing mutations, skin cancer, cataracts.
  • 13. Effects of Ozone Thinning2. UV-B – kill some species of plants and microbes
  • 14. Effects of Ozone Thinning-Limiting factor for coral communities-Reduced productivity of aquatic ecosystems