ReviewSection4_atmos_ocean_circs - SAN FRANCISCO STATE...

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SAN FRANCISCO STATE UNIVERSITY Department of Geography & Human Environmental Studies Geog 101, Our Physical Environment Section 4: Atmospheric and oceanic circulations From this section you should be familiar with the following concepts: Atmospheric pressure and its relationship with temperature o Pressure Gradient Force: initiating air movement, direction from high to low pressure and intensity due to size of pressure gradient (evident from isobar spacing) o Coriolis Force: turning force (doesn’t change wind speed but causes bending or=f wind to right in NH and left in SH. Coriolis Force, derived from rotation increases with latitude and is stronger with faster wind. o Friction Force: Force is opposite to wind direction and proportional to wind speed, result, slows wind near surface. Speed reduction near surface lowers Coriolis turning relative to free flowing air above, resulting in convergence into low pressure and divergence out of high pressure. This has implications for vertical air movement and likelihood of clouds and rain and explains why high pressure usually has weaker winds, clearer skies and less rain and low pressure
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This note was uploaded on 10/06/2011 for the course GEOL 101 taught by Professor Staff during the Spring '11 term at S.F. State.

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ReviewSection4_atmos_ocean_circs - SAN FRANCISCO STATE...

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