Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

El nino powerpoint


Published on

Published in: Technology, Business

El nino powerpoint

  1. 1. El Nino mass of warm surface water moving west to east across equatorial Pacific Ocean part of larger phenomenon called El Nino – Southern Oscillation (ENSO)
  2. 2. <ul><li>winds move from areas of high </li></ul><ul><li>pressure to areas of low pressure </li></ul><ul><li>ex: air from balloon exits balloon </li></ul>
  3. 3. <ul><li>normal situation over Pacific Ocean </li></ul><ul><li>(non-El Nino year): </li></ul><ul><li>low pressure over Asia </li></ul><ul><li>high pressure over South America </li></ul><ul><li>winds blow east to west </li></ul><ul><li>shallow thermocline along South </li></ul><ul><li>America, lots of upwelling, cold water </li></ul><ul><li>at surface </li></ul><ul><li>deeper thermocline near Asia, warm </li></ul><ul><li>surface water piles up </li></ul>
  4. 6. <ul><li>El Nino years over Pacific Ocean: </li></ul><ul><li>pressure change = Southern Oscillation </li></ul><ul><li>higher pressure over Asia </li></ul><ul><li>lower pressure over South America </li></ul><ul><li>winds weaken or blow west to east </li></ul><ul><li>thermocline deepens along South </li></ul><ul><li>America, little upwelling, warmer water at surface </li></ul><ul><li>warm surface water sloshes back along equatorial Pacific </li></ul>
  5. 10. sea surface temperature in Pacific Ocean
  6. 11. <ul><li>El Nino occurs every 3 to 8 years </li></ul><ul><li>usually lasts about 1 year </li></ul><ul><li>scientists do not know why pressure </li></ul><ul><li>changes causing winds to shift </li></ul><ul><li>warm water arrives at South America </li></ul><ul><li>around Christmas – hence El Nino – </li></ul><ul><li>for the Christ Child </li></ul>
  7. 12. Effects of El Nino <ul><li>upwelling along Peru reduced </li></ul><ul><li>warm water with few nutrients rises </li></ul><ul><li>fisheries decline </li></ul>
  8. 13. Effects of El Nino <ul><li>increased precipitation over parts of </li></ul><ul><li>South America, western and </li></ul><ul><li>southern U.S. </li></ul><ul><li>can result in severe flooding </li></ul><ul><li>drought in Australia, Indonesia, </li></ul><ul><li>Phillipenes </li></ul><ul><li>reduction in annual monsoons in India </li></ul><ul><li>can result in severe crop damage </li></ul><ul><li>severe property damage and thousands </li></ul><ul><li>of deaths </li></ul>
  9. 14. La Nina <ul><li>opposite El Nino </li></ul><ul><li>swings the other way and winds blow </li></ul><ul><li>more than normal towards west </li></ul>