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Air Pressure and Winds

Air Pressure and Winds. Triple A Productions A rnold Roberts A llison Couch A my Jacobs. Pressure Gradient Force. Pressure differences existing between areas cause air to blow from an area of high pressure toward an area of low pressure. Balancing Pressure Differences. Warm Air. Wind.

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Air Pressure and Winds

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  1. Air Pressure and Winds Triple A Productions Arnold Roberts Allison Couch Amy Jacobs

  2. Pressure Gradient Force Pressure differences existing between areas cause air to blow from an area of high pressure toward an area of low pressure

  3. Balancing Pressure Differences Warm Air Wind High Pressure Zone Heavy Air Low Pressure Zone Heavy air stays close to the Earth’s surface Winds are produced Warm air is moved in an upward motion

  4. Differences in Pressure Zones If distance between high and low are short 1. pressure gradient is steep 2. wind velocities are great If gentle air movements occur when zones are far apart 1. the degree of difference is not great

  5. Convection System The circulatory motion of descending cool air and ascending warm air

  6. The Coriolis Effect As winds move from high pressure to low pressure: winds in the N. Hemisphere tend to travel to the right, winds in the S. Hemisphere tend to travel to the left

  7. Coriolis Effect The skaters in the middle of the circle do not need to move very quickly, while the out most skaters have to move rapidly to maintain this line

  8. How does this relate? The Earth rotates on its axis Equatorial regions are rotating much faster Polar regions are rotating much slower

  9. Coriolis Effect with Pressure Gradient Force When together they produce spirals rather then straight lines of wind The spiral is the basic form of many storms

  10. The Frictional Effect The cause of wind to follow an intermediate path

  11. Wind Movements are slowed due to friction on Earth’s surface Friction becomes ineffective about 1 mile above the Earth’s surface Friction causes wind speed to decrease and change direction

  12. Global Air Circulation • Equatorial Low Pressure • Areas of low pressure at the equator line • Subtropical High Pressure • Cooled heavier air from the equatorial air pressure • Northeast Trades and Westerlies (Southwesterlies) • Belts of wind caused by the cooled air reaching the earths surface • Polar Air Pressure • Subpolar low is ascending air north of the westerlies • Polar Easterlies connect the Subpolar low to the Polar high pressure • Has the greatest effect on Jet Streams cosscience1.pbworks.com

  13. Jet Streams • Strongest flows of upper air wind • 30,000 – 40,0000 feet from the earths surface • Air travels East to West, in both hemispheres, at 100 – 200 MPH • Tends to separate cold polar air from warm tropical air • Movement of the Jet Stream has the greatest effect on monsoon season in Southeast Asia

  14. Monsoons • Monsoon wind changes directions seasonally • Sothern and Eastern Asia is effected by this phenomena the most

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