The O Zone Hole Charlotte And Alex

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The O Zone Hole Charlotte And Alex

  1. 1. <ul><li>How do people use polar environments? </li></ul><ul><li>What challenges do polar environments pose? </li></ul>
  2. 2. What is The Ozone Hole? <ul><li>Any ideas? </li></ul><ul><li>Answer: The ozone hole is part of the ozone layer, and is an area over the Antarctica where the ozone concentration is much lower. </li></ul><ul><li>The lack of O3 due to the lack of sun radiation. </li></ul><ul><li>NOTE! The ozone hole is not really a hole. It is where the concentration of ozone is much lower than normal. </li></ul>
  3. 3. A Diagram of the Ozone Layer… 110 220 330 440 550 660+ Total Ozone Dobson Units.
  4. 4. Ozone – Where and What? <ul><li>A gas made of oxygen atoms – usually the atoms are in pairs but occasionally three atoms join to make Ozone. </li></ul><ul><li>Its more likely to be found much higher up in the atmosphere. </li></ul><ul><li>The ozone layer is formed by the action of ultra-violet rays in sunlight on oxygen molecules, turning them into ozone. </li></ul><ul><li>More ozone is formed in the tropics, as it is over the Equator, where the sun is stronger, then it gradually spreads out around the globe. </li></ul>
  5. 6. We need the ozone layer... <ul><li>The main reason that we need the ozone layer is because it absorbs the ultra-violet light so that it cannot penetrate any further into the atmosphere. This is fortunate for us because this UV light can cause serious harm... </li></ul><ul><li>Skin Cancer </li></ul><ul><li>Eye Damage like Cataracts </li></ul><ul><li>Damage to the Immune System. </li></ul>
  6. 7. The Ozone History... <ul><li>It was discovered by 2 British Scientists in 1985. </li></ul><ul><li>Two years later, in1987, the Montreal Protocol agreed to ban the use of CFC’s. Most countries have now signed to this. </li></ul><ul><li>CFC’s are big problem – they last for many years in the atmosphere and they can still get into the atmosphere by destroying old fridges, for example. </li></ul><ul><li>In 2003, the Ozone Hole was bigger than ever. But without the Montreal Protocol it would have been much worse. The ban should allow the ozone layer to have recovered by 2050. </li></ul><ul><li>Ironically, the people who are worst affected by the ozone hole are the people who discovered it – the scientists in Antarctica! </li></ul>
  7. 8. Your Task… <ul><li>Label the different area’s of the atmosphere on the sheet given. </li></ul><ul><li>Once you’re confident with the different area’s in the atmosphere, think carefully and practically about which layer the ozone layer is found in. </li></ul>
  8. 9. The Sheet…
  9. 10. The Answer!  <ul><li>This is what your sheet should look like.. </li></ul>
  10. 11. Thank you for watching!  Hope you’ve learnt something new!

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