GEOL150_week4_lecture2_Rotation_Stratification

GEOL150_week4_lecture2_Rotation_Stratification - Week 4,...

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GEOl50: Climate Change University of Southern California, Los Angeles Week 4, lecture 2 Effects of rotation and stratification
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Two fundamental features of the atmosphere Stratifcation Rotation (Horizontal Motion) (Vertical Motion)
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Main forces acting on a parcel of air Gravity Pressure Gradient Force Friction Coriolis Force
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The Coriolis Effect (1)
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The Coriolis Effect (2)
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The Coriolis Effect (3) The Coriolis “Force” is an apparent force It arises because of our frame of reference, which moves with the Earth but is Fxed w.r.t to the stars The Coriolis force has 4 fundamental properties Apparent de±ection of motion at towards the right in N.H. (the left in S.H.) Zero at the equator, maximum at the poles Increases in proportion to the object’s speed Changes only the direction of motion, not the speed NB: only acts on large spatial scales (not your bathtub)
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Friction Friction near the surface converts momentum into heat This tends to oppose atmospheric motion (“drag”) Explains differences between surface and altitude motion F r = - rv Drag force
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15 Sept. 2005
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This note was uploaded on 10/04/2010 for the course GEOL 150Lxg taught by Professor Stott during the Spring '07 term at USC.

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GEOL150_week4_lecture2_Rotation_Stratification - Week 4,...

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