Chapter 6 Air Pressure and Winds

  1. Atmospheric pressure
    as the force per unit area on a surface exerted by the weight of the air above.
  2. Millibar (mb)
    Average sea-level pressure is stated at 1013.25 millibars
  3. Anticyclones
    High-pressure systems that are associated with dry conditions
  4. Cyclones or midlatitude cyclones
    Low-pressure systems are associated with stormy weather.
  5. Isobars
    Lines that connect places of equal air pressure.
  6. Ridges
    Are elongated high-pressure areas that extend toward the poles and are associated with warm, dry air.
  7. Troughs
    Are elongated areas of low pressure that extend equatorward, and they are usually associated with cool, wet weather
  8. Pressure Gradient Force
    The amount of pressure occurring over a given distance
  9. Coriolis Force
    Does not generate wind; rather, it modifies the direction of airflow.  Proportional to wind speed.
  10. Geostrophic wind
    Is generated when a balance is reached between the Coriolis force (CF) and the pressure gradient force (PGF).
  11. Geostrophic Balance
    When the Coriolis force is exactly equal in strength to the pressure gradient force but acting in the opposite direction.
  12. Gradient Winds
    Winds that blow at a constant speed parallel to curved isobars.
  13. Cyclonic flow
    Has the same direction of rotation as Earth: counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
  14. Anticyclonic Flow
    Opposite that of Earth's rotation.
  15. Centripetal acceleration
    The inward turning of the air.  (Low-pressure center)
  16. Prevailing wind
    When the wind consistently blows more often from one direction than from any other.
  17. Wind
    Is the result of horizontal differences in atmospheric pressure.
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davecowman
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351021
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Chapter 6 Air Pressure and Winds
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Air Pressure and Winds
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