Surface currents

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Surface currents

  1. 1. SURFACE CURRENTS
  2. 2. <ul><li>Surface Currents </li></ul><ul><li>horizontal </li></ul><ul><li>wind-driven </li></ul><ul><li>caused by friction between wind and water </li></ul><ul><li>wind blows water, but then Coriolis effect affects direction of water movement </li></ul>
  3. 3. Coriolis Effect
  4. 4. Coriolis Effect <ul><li>wind blows the water, but then water is </li></ul><ul><li>deflected clockwise or counterclockwise </li></ul><ul><li>results in: </li></ul><ul><li>gyres – massive circular systems of </li></ul><ul><li>wind-driven surface currents – similar </li></ul><ul><li>patterns in Atlantic, Pacific and Indian </li></ul><ul><li>Oceans </li></ul>
  5. 5. main gyres in the world’s ocean northern hemisphere - clockwise southern hemisphere - counterclockwise
  6. 6. WIND PATTERNS
  7. 7. wind patterns and Coriolis effect result in the major currents in the ocean
  8. 16. Western Boundary Currents <ul><li>along western edge of ocean basins </li></ul><ul><li>strongest currents in oceans </li></ul><ul><li>in part due to amplification of Coriolis </li></ul><ul><ul><li>effect at higher latitudes </li></ul></ul><ul><li>ex: Gulf Stream Current </li></ul>
  9. 17. Eastern Boundary Currents <ul><li>along eastern edge of ocean basins </li></ul><ul><li>much weaker </li></ul><ul><li>ex: Canary Current </li></ul>
  10. 18. western boundary currents are stronger than eastern boundary currents
  11. 19. The Gulf Stream <ul><li>known for years that currents could </li></ul><ul><li>help ships travel faster </li></ul><ul><li>Benjamin Franklin had first map of </li></ul><ul><li>Gulf Stream </li></ul><ul><li>Current made </li></ul>
  12. 20. The Gulf Stream <ul><li>western boundary current in North Atlantic </li></ul><ul><li>strongest current in ocean </li></ul><ul><li>separates cold northern water from warmer water of the Sargasso Sea </li></ul>
  13. 21. The Gulf Stream Current
  14. 22. Eddies <ul><li>also called warm core rings </li></ul><ul><li>break off of currents </li></ul><ul><li>can transport tropical organisms to </li></ul><ul><li>Long Island waters </li></ul>
  15. 23. how eddies form

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