Ch. 22 Movements of the Oceans - PowerPoint PPT Presentation

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Ch. 22 Movements of the Oceans

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Ch. 22 Movements of the Oceans Ch. 22.1 Ocean Currents Objectives By the end of this unit, you should be able to: Discuss how wind patterns affect surface currents. – PowerPoint PPT presentation

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Title: Ch. 22 Movements of the Oceans


1
Ch. 22 Movements of the Oceans
  • Ch. 22.1 Ocean Currents

2
Objectives
  • By the end of this unit, you should be able to
  • Discuss how wind patterns affect surface
    currents.
  • Explain how differences in the density of ocean
    water affect the flow of deep currents.

3
  • Currentsgiant streams of ocean water.
  • There are Surface Currents and Deep Currents.

4
Surface Currents
  • Wind is the driving force of surface currents.
  • Most surface currents result from global wind
    patterns.
  • Surface currents are fastest near the surface,
    and are almost undetectable 100 meters below the
    surface.

5
Factors Affecting Ocean Surface Currents
  • 1. The wind belts
  • 2. Earths rotational effects
  • 3. Location of the continents

6
  • Huge circles of moving water, or gyres, result
    from the wind belts and Coriolis force.
  • Gyres move clockwise in the northern hemisphere,
    and counterclockwise in the southern hemisphere.
  • Major landmasses may deflect or divide surface
    currents.

7
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8
  • Trace out surface currents. Reading pg. 428-430.

9
Deep Currents
  • Slow, cold, dense deep currents form when the
    cold polar water sinks and flows beneath the
    warmer ocean water toward the equator.
  • The cold high-salinity dense water stays below
    the warmer lower-density water.

10
Antarctic Bottom Water
  • Cold, salty dense water forming near Antarctica
    sinks and moves slowly northward along the bottom
    of the ocean, far into the N. hemisphere. The
    trip can take several hundred years.

11
North Atlantic Deep Water
  • Cold water deep current that forms in the Arctic
    flows southward, but it rides above the denser
    Antarctic bottom water.

12
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13
  • High salinity, high density water that forms in
    the Mediterranean due to evaporation sinks and
    flows outward through the Straits of Gibraltar.

14
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15
Turbidity Currents
  • Caused by underwater landslides.
  • Dense, sediment-laden water moves under
    less-dense, clear water.
  • May cause deepening of submarine canyons.

16
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