Do Now 05.19.10

1. Do Now05.19.10 • What causes the seasons?

2. Objective State the reasons for global wind patterns and ocean currents.

4. Coriolis effect: deflection of wind and ocean currents caused by the Earth’s rotation Winds in S. Hemisphere flow to the left Winds in N. Hemisphere flow to the right

6. (2) global winds • jet stream: narrow belt of strong, high speed air • height about 10 to 15 km above N. and S. Hemispheres • closely related to weather

7. http://www.weatherimages.com/data/imag192.html (current position)

8. anemometer: instrument that measures wind speed

10. wind vane: measures wind direction

11. *always points into the wind wind This is an easterly wind because it is blowing from the east

13. Doldrums

14. Uneven heating of air • CoriolisEffect

15. Ocean Currents • Currents are the steady movement of water in the ocean

16. Ocean Currents • Currents are the steady movement of water in the ocean • surface currents move on or near the surface

17. Ocean Currents • Currents are the steady movement of water in the ocean • surface currents move on or near the surface • driven by the wind

18. Ocean Currents • Currents are the steady movement of water in the ocean • surface currents move on or near the surface • driven by the wind • deep currents occur deep beneath the surface

19. Ocean Currents • Currents are the steady movement of water in the ocean • surface currents move on or near the surface • driven by the wind • deep currents occur deep beneath the surface • caused by differences in the density of the water

20. Ocean Currents • Currents are the steady movement of water in the ocean • surface currents move on or near the surface • driven by the wind • deep currents occur deep beneath the surface • caused by differences in the density of the water • move very slowly

21. Surface Currents • Wind provides energy to move large masses of water

22. Surface Currents • Wind provides energy to move large masses of water • upper layer of water moves the fastest

23. Surface Currents • Wind provides energy to move large masses of water • upper layer of water moves the fastest • velocity decreases with depth

24. Surface Currents • Wind provides energy to move large masses of water • upper layer of water moves the fastest • velocity decreases with depth • below 100m most surface currents are undetectable

26. Surface Currents • Surface currents are controlled by three factors

27. Surface Currents • Wind belts

28. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator

29. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator • push currents westward across tropical latitudes

30. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator • push currents westward across tropical latitudes • Westerlies are located in the middle latitudes

31. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator • push currents westward across tropical latitudes • Westerlies are located in the middle latitudes • push eastward in the northern hemisphere

32. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator • push currents westward across tropical latitudes • Westerlies are located in the middle latitudes • push eastward in the northern hemisphere • in the south, pushes West Wind Drift completely around the world

33. Surface Currents • Wind belts • Trade Winds are located just north and south of the equator • push currents westward across tropical latitudes • Westerlies are located in the middle latitudes • push eastward in the northern hemisphere • in the south, pushes West Wind Drift completely around the world • earth’s largest current

34. westerlies

36. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents

37. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents • caused by the rotation of the earth

38. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents • caused by the rotation of the earth • Gyres: huge circles of moving water

39. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents • caused by the rotation of the earth • Gyres: huge circles of moving water • caused by the combination of wind belts and the coriolis effect

40. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents • caused by the rotation of the earth • Gyres: huge circles of moving water • caused by the combination of wind belts and the coriolis effect • clockwise in the northern hemisphere

41. Surface Currents • Coriolis effect: deflection of the earth’s winds and ocean currents • caused by the rotation of the earth • Gyres: huge circles of moving water • caused by the combination of wind belts and the coriolis effect • clockwise in the northern hemisphere • counterclockwise in the southern

42. Surface Currents • Third factor affecting currents

43. Surface Currents • Third factor affecting currents • continents

44. Surface Currents • Third factor affecting currents • continents • deflect and divide currents

45. Surface Currents • Equatorial currents: westward moving warm-water currents

46. Surface Currents • Equatorial currents: westward moving warm-water currents • Located in all three oceans

47. Surface Currents • Equatorial currents: westward moving warm-water currents • Located in all three oceans • currents in the northern hemisphere

48. Surface Currents • Equatorial currents: westward moving warm-water currents • Located in all three oceans • currents in the northern hemisphere • swift warm water moves north in the western side of the oceans

49. Surface Currents • Equatorial currents: westward moving warm-water currents • Located in all three oceans • currents in the northern hemisphere • swift warm water moves north in the western side of the oceans • Cool currents move south in the eastern side

50. Surface Currents • examples of warm water currents: