Rc3 ocean currents


Published on

Published in: Technology, Business
  • Be the first to comment

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Rc3 ocean currents

  1. 1. Ocean Currents
  2. 2. Warm currents flow away from the equator. Cold currents flow toward the equator. Ocean Currents
  3. 3. Sun Wind Coriolis Gravity Factors Influencing Currents
  4. 4. Energy from the Sun heats the water. Warm water is less dense that cold water. Warm water rises, and cold water sinks. As warm water rises, cold water moves it to replace it. Sun
  5. 5. Convection Cycle
  6. 6. Just as wind moves from high pressure to low pressure areas, so does the water. Winds blow across the surface of the water, causing friction. The water piles up because the surface currents flow slower than the winds. Wind
  7. 7. Wind
  8. 8.  As water piles up and flows from high pressure to low pressure, gravity will pull down on the water.  This forms vertical columns or mounds of water.  The Coriolis Effect causes the water to curve. Gravity
  9. 9. Causes water to move to the right in the Northern Hemisphere Causes water to move to the left in the Southern Hemisphere The Coriolis Effect
  10. 10. The Coriolis Effect
  11. 11. Make up 10% of oceans’ water Up to maximum depth of 400 m Surface ocean currents are caused by the surface wind patterns. Surface Currents
  12. 12. Surface Currents
  13. 13.  Vertical columns or mounds of water at the surface and flow around them  Produce enormous circular currents  Five major locations:  North Pacific - clockwise  South Pacific - counterclockwise  Indian Ocean - counterclockwise  South Atlantic - counterclockwise  North Atlantic - clockwise Gyres
  14. 14. Oceanic Gyres
  15. 15.  A strong surface current  Begins at the tip of Florida  Flows up the eastern coastline of the U.S.  Crosses the Atlantic Ocean  Causes warmer climate in NW Europe Gulf Stream
  16. 16. Surface waters blow to the right of the wind. As less dense, surface water moves off shore, cold, deep, denser waters come to the surface to replace them. Upwelling
  17. 17. Upwelling
  18. 18. The Great Ocean Conveyor: Helps maintain Earth’s Balance
  19. 19.  Make up about 90% of oceans’ water  Differences in density cause them to move.  Differences in density are related to temperature and salinity.  At high latitudes, they sink deep into the ocean basins.  Temperatures are so cold, they cause the density to increase. Deep Water Currents
  20. 20. How are ocean currents produced? Reflective Question
  21. 21. Abnormally high surface ocean temperatures off the coast of South America Causes unusual weather patterns across the globe El Nino
  22. 22.  Starts because the easterly trade winds weaken and allow the warm waters in the Western Pacific to move east toward South America  This changes where the convection current occurs.  Causing rain where it usually doesn't occur and drought where it usually rains El Nino
  23. 23. El Nino Winter
  24. 24. El Nino Summer
  25. 25. Abnormally low surface ocean temperatures off the coast of South America Causes unusual weather patterns across the globe La Nina
  26. 26.  Ocean currents move more slowly than winds.  Oceans hold more heat than the atmosphere and land.  Cold currents will cause nearby coastlines to be cooler.  Warm currents will cause nearby coastlines to be warmer. Where do the cold currents come from? The warm currents? Ocean’s Effect on Climate
  27. 27. Predictable Patterns How do these currents affect the climate of the coastline?
  28. 28. How do our oceans impact climate? Reflection Questions
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.