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Chapter 6 Air Pressure and Winds
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Atmospheric pressure
as the force per unit area on a surface exerted by the weight of the air above.
Millibar (mb)
Average sea-level pressure is stated at 1013.25 millibars
Anticyclones
High-pressure systems that are associated with dry conditions
Cyclones or midlatitude cyclones
Low-pressure systems are associated with stormy weather.
Isobars
Lines that connect places of equal air pressure.
Ridges
Are elongated high-pressure areas that extend toward the poles and are associated with warm, dry air.
Troughs
Are elongated areas of low pressure that extend equatorward, and they are usually associated with cool, wet weather
Pressure Gradient Force
The amount of pressure occurring over a given distance
Coriolis Force
Does not generate wind; rather, it modifies the direction of airflow. Proportional to wind speed.
Geostrophic wind
Is generated when a balance is reached between the Coriolis force (CF) and the pressure gradient force (PGF).
Geostrophic Balance
When the Coriolis force is exactly equal in strength to the pressure gradient force but acting in the opposite direction.
Gradient Winds
Winds that blow at a constant speed parallel to curved isobars.
Cyclonic flow
Has the same direction of rotation as Earth: counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
Anticyclonic Flow
Opposite that of Earth's rotation.
Centripetal acceleration
The inward turning of the air. (Low-pressure center)
Prevailing wind
When the wind consistently blows more often from one direction than from any other.
Wind
Is the result of horizontal differences in atmospheric pressure.
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Author
davecowman
ID
351021
Card Set
Chapter 6 Air Pressure and Winds
Description
Air Pressure and Winds
Updated
2020-03-01T12:41:55Z
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