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Atmospheric Motion - Reading Chap 1.3 Atmospheric Motion...

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08/12/09 1 Atmospheric Motion Wind Pressure Gradient Force Coriolis Effect Cyclones General Circulation of the Atmosphere Reading: Chap 1.3
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08/12/09 2 Atmospheric Motion Air/atmosphere in constant motion due to unequal distribution of energy over earth’s surface Winds Generally used to describe horizontal air movement Result from pressure differences Direction of flow affected by Pressure gradient force (PGF) Coriolis effect (CE) Friction Why unequal? Why do we care about winds?
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08/12/09 3 Pressure Gradient Force Force associated with pressure gradients Gradients can be described in the context of spacing of isobars (areas of equal pressure) on weather maps Steep gradients when isobars are close together Small gradients when isobars are far apart Coriolis Effect Apparent deflection of air as it flows northward or southward Due to earth rotation In N hemisphere, northward flow deflected to the NE In N hemisphere, southward flow deflected to the SW Depends on latitude and wind speed French mathematician Gaspard de Coriolis (1792–1843) www.theozonehole.com/coriolis.htm Is the wind stronger or weaker with steep gradients?
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08/12/09 4 Surface Weather Map jrscience.wcp.muohio.edu/.../computermodels.html
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08/12/09 5 Coriolis Effect luna.tau.ac.il/.../Chapter3/Coriolis_Effect.htm www.newmediastudio.org/.../Geostrophic_Wind.html www.mhhe.com/.../fix/student/chapter8/08f06.html
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