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Global Winds

Global Winds. 6 th Grade Science. Air Movement. Wind is the horizontal movement of air caused by differences in air pressure. The air moves from H igh Air Pressure to L ow Air Pressure. The greater the difference, the faster the wind moves. Cause for the differences in Air Pressure.

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Global Winds

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  1. Global Winds 6th Grade Science

  2. Air Movement • Wind is the horizontal movement of air caused by differences in air pressure. • The air moves from High Air Pressure to Low Air Pressure. • The greater the difference, the faster the wind moves

  3. Cause for the differences in Air Pressure • Caused by the uneven heating of Earth • Uneven heating produces pressure belts which occur every 30° latitude

  4. Pressure Belts • As warm air rises at the equator and moves toward the poles, it cools • As it cools, some of the air sinks around 30° north and south of the equator

  5. Pressure Belts • At the poles, cold air sinks and moves towards the equator • Around 60° north and south, the air begins to heat up and rise

  6. Global Winds • The combination of pressure belts and the Coriolis Effect cause global winds • What are the Global Winds? • These are polar easterlies, westerlies, and trade winds

  7. Polar Easterlies • Wind belts that extend from the poles to 60° latitude • Formed from cold sinking air moving from the poles creating cold temperatures

  8. Prevailing Westerlies • Wind belts found between 30° and 60° latitude • Flow towards the poles from west to east carrying moist air over the United States

  9. Trade Winds • Winds that blow from 30° almost to the equator • These are steady, high pressure winds called the trade winds because of their early use by sailors.

  10. Other Global Wind BeltsDoldrums • Located along the equator where no winds blow because the warm rising air creates an area of low pressure

  11. Horse Latitudes • Occur at about 30° north and south of the equator where the winds are very weak • Most deserts on the Earth are located here because of the dry air

  12. Jet Stream • The jet streams are bands of high-speed winds about 10 kilometers above Earth’s surface. • Separates warm air from cold air

  13. Review of Local Winds Land Breeze and Sea Breeze

  14. Question 1 • What causes winds?

  15. Answer • Winds are caused by the uneven heating of Earth’s surface, which causes pressure differences

  16. Question 2 • What are the three main types of global winds?

  17. Answer • Polar Easterlies • Westerlies • Trade Winds

  18. Question 3 • What is the difference between a land breeze and a sea breeze?

  19. Answer • Sea breezes occur during the day when the land is warmer than water and a land breeze occurs at night when the water is warmer than land

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