Section 3 Notes

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Section 3 Notes

  1. 1. Air Movement Section 3
  2. 2. Forming Wind <ul><li>Wind is the movement of air from an area of high pressure to an area of lower pressure. </li></ul>
  3. 3. Local Wind Systems <ul><li>Local wind systems – affect local weather </li></ul><ul><li>Sea breezes – a convection current blows wind from the cooler sea toward warmer land during the day </li></ul>
  4. 4. Local Wind Systems <ul><li>Land breezes – at night, air moves off the land toward the water as the land cools more rapidly than the water </li></ul>
  5. 5. Forming Wind <ul><ul><li>Different areas of Earth receive different amounts of the Sun’s radiation. </li></ul></ul>
  6. 6. Forming Wind - 1 <ul><li>The equator receives the Sun’s rays more directly than do the north and south poles. </li></ul>
  7. 7. Forming Wind - 2 <ul><li>As a result, the air near the equator is less dense than the colder air masses near the poles. </li></ul>
  8. 8. Forming Wind - 3 <ul><li>Dense air moves from the poles toward the less dense air near the equator to cause wind. </li></ul>
  9. 9. Forming Wind - 4 <ul><li>The rotation of Earth causes the moving air to turn. </li></ul>
  10. 10. Forming Wind - 5 <ul><li>Thus, the Coriolis effect causes surface wind to blow in bands: the polar easterlies, westerlies, and trade winds. </li></ul><ul><li>Near the equator, very little wind and daily rain patterns the doldrums </li></ul>
  11. 11. Global Winds <ul><li>Surface Winds </li></ul><ul><ul><li>Between the equator and 30 latitude (north and south) are steady trade winds, blowing to the west </li></ul></ul><ul><ul><li>Between 30 and 60 latitude (north and south) the prevailing westerlies blow to the east, in the opposite direction of trade winds. </li></ul></ul><ul><ul><li>Polar easterlies blow from northeast to southwest near the north pole and from southeast to northwest near the south pole. </li></ul></ul>
  12. 12. Global Wind Affecting Trade <ul><li>The Coriolis Effect on Trade </li></ul>

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