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FORCES. GLOBAL . Global Convection The main cause for global convection is the uneven heating of the Earth from the Sun. The Sun heats the equator directly and the heat is dispersed by the convection.

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Presentation Transcript
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FORCES

GLOBAL

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Global Convection

  • The main cause for global convection is the uneven heating of the Earth from the Sun. The Sun heats the equator directly and the heat is dispersed by the convection.
  • Wind (land/sea breezes) are also caused by uneven heating of the Earth, because of the movement of air from an area of high pressure to an area of low pressure.
  • Warm air is less dense
  • Cold air is more dense
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Earth’s Rotation

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Earth rotates to the right/ counter-clockwise

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Continental Deflection

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Since the Earth’s surface is not fully covered by water, currents cannot move freely around the world. So when surface currents meet continents they DEFLECT or change direction

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CORIOLIS EFFECT

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The Earth’s rotation causes surface currents to move in curved paths rather than in a straight line

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equator

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GlobalWinds

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Global winds are affected by their latitude and the Coriolis Effect. In the tropics, winds blow from the East to the West. In more temperate areas, the winds blow from the West to the East. Near the poles the winds blow from East to West.

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equator

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DEEPOCEANCURRENTS

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Deep cold currents move water toward the equator. Cold water rises to replace warm water leaving. Warm water travels near the surface toward polar regions.Warm water replaces cold water.

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equator