Ch18_Lecture - Today's Epitome Questions Some lecture on Ch...

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05/13/09 GEOL 1401/tob 1 Today’s Epitome Questions Some lecture on Ch 18 Next time
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05/13/09 GEOL 1401/tob 2 GEOL 1401 Chapter 18 Air Pressure and Wind Dr. Thomas O. Bush Roberts 116 thomasbu@dbu.edu 214-333-5318
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05/13/09 GEOL 1401/tob 3 Atmospheric pressure Force exerted by the weight of the air above Weight of the air at sea level 14.7 pounds per square inch 1 kilogram per square centimeter Decreases with increasing altitude Units of measurement Millibar (mb) standard sea level pressure is 1013.2 mb Inches of mercury standard sea level pressure is 29.92 inches of mercury
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05/13/09 GEOL 1401/tob 4 A mercury barometer Invented by Torricelli in 1643 Uses a glass tube filled with mercury Air pressure pushing down on the mercury pool pushes up the column in the glass tube.
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05/13/09 GEOL 1401/tob 5 Wind Horizontal movement of air Out of areas of high pressure Into areas of low pressure Displayed as a Pressure gradient pressure change over distance Using Isobars – lines of equal air pressure
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05/13/09 GEOL 1401/tob 6 A weather map showing isobars and wind speed/direction
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05/13/09 GEOL 1401/tob 7 Wind What determines the wind characteristics Pressure gradient Coriolis effect Apparent deflection in the wind direction due to Earth's rotation • right in the Northern Hemisphere • left in the Southern Hemisphere Friction Only important near the surface Acts to slow the air's movement
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05/13/09 GEOL 1401/tob 8 The Coriolis effect The deflective force of the earth’s rotation on the earth and the oceans Rotation Effect
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05/13/09 GEOL 1401/tob 9 Geostropic Winds Upper air winds Generally blow parallel to isobars Jet stream "River" of air High altitude High velocity (120-240) kilometers per hour
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05/13/09 GEOL 1401/tob 10 Geostrophic wind above 600 m blows parallel to the isobars
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05/13/09 GEOL 1401/tob 11 Comparison between upper- level winds and surface winds
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This note was uploaded on 04/15/2008 for the course GEOL 1401 taught by Professor Thomasbush during the Spring '08 term at Dallas Baptist.

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Ch18_Lecture - Today's Epitome Questions Some lecture on Ch...

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