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GEOL150_week4_lecture3_circulation

GEOL150_week4_lecture3_circulation - Week 4 lecture 3 The...

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GEOl50: Climate Change University of Southern California, Los Angeles Week 4, lecture 3 The general circulation of the atmosphere
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How Columbus crossed the Atlantic: the Trade Winds
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Surface Winds http://sos.noaa.gov/datasets/Ocean/vector_winds.html
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Remarkable features from space Midlatitude cyclones Tropical Cyclones ITCZ Dry regions
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Why does the atmosphere need to move ? Imbalances of radiant energy
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Hadley’s picture Hadley , 1735 A thermally direct circulation Does the buoyancy force organizes the large-scale circulation of the atmosphere ?
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Process : Convection understorms Deep Convection Tropical Cyclones
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The Hadley Circulation Heating in the tropics, near the surface, drives convection , which drives low pressures near the equator, which drives convergence Air rises and moves poleward until its lost enough heat and momentum, then sinks ( subsidence ) So it does not reach the poles... Instead, stops around 30 degrees Intertropical Convergence Zone
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Where it stops : the subtropical jet stream Meander
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