Global Winds And Local Winds

5,745 views

Published on

Published in: Education, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
5,745
On SlideShare
0
From Embeds
0
Number of Embeds
63
Actions
Shares
0
Downloads
64
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Global Winds And Local Winds

  1. 1. Mrs. Harsh 6 th Grade Science 2/9/2010
  2. 2. Air Rises at the Equator & Sinks at the Poles <ul><li>Differences in air pressure are generally cause by unequal heating of the earth. </li></ul><ul><li>Area at equator receives more direct sunlight, causing warm, less dense air to rise to create an area of low pressure. </li></ul><ul><li>Warm air flows toward poles. </li></ul><ul><ul><li>At the poles the air cools & sinks. </li></ul></ul><ul><ul><li>As cold air sinks, pressure increases. </li></ul></ul><ul><ul><li>The cold air then flows toward equator. P. 459 </li></ul></ul><ul><ul><li>Winds that blow from 30 degrees latitude almost to the equator are called trade winds . </li></ul></ul>
  3. 3. Pressure Belts are Found Every 30 degrees <ul><li>Pressure belt: bands of high pressure & low pressure found about every 30 degrees of latitude. </li></ul><ul><li>Air travels in many large circular patterns called convection cells, which are separated by pressure belts. </li></ul>
  4. 4. The Coriolis Effect <ul><li>Not only affects ocean currents, but also the path of winds as well. </li></ul><ul><li>Winds traveling north curve east and winds traveling south curve to the west. </li></ul>
  5. 5. Global vs. Local Winds <ul><li>Global </li></ul><ul><li>Local </li></ul><ul><li>Combination of convection cells & Coriolis effect produces patterns of air circulation called Global Winds. </li></ul><ul><li>Generally move short distances and can blow from any direction. </li></ul><ul><li>Mountains or shorelines can produce temperature difference that cause local winds. </li></ul><ul><li>Land heats faster than water. </li></ul><ul><ul><li>Air above land becomes warmer than above the ocean. </li></ul></ul><ul><ul><li>Warm air rises, cold air from ocean replaces it. </li></ul></ul><ul><ul><li>At night land cools faster, wind blows toward the ocean. P. 462 </li></ul></ul>
  6. 6. Jet Streams <ul><li>Narrow belts of high-speed winds that blow in the upper troposphere and lower stratosphere. </li></ul><ul><li>Unlike global winds, jet streams do not follow regular paths around the earth. </li></ul><ul><li>Jet streams affect the movement of storms, thus meteorologists can track a storm if they know the location of a jet stream. </li></ul>
  7. 7. Review: <ul><li>How does air temperature over landmasses and adjacent bodies of water change between day and night. </li></ul><ul><ul><li>During the day, the air is cooler over water. At night, the air is cooler over land. </li></ul></ul>

×