AOSC200Lect13 - AOSC 200 Lesson 13 Fig 7.13 Subtropical and...

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AOSC 200 Lesson 13
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Fig. 7.13 Subtropical and Polar jet streams in relation to the three cells
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WESTERLIES IN THE UPPER TROPOSPHERE THERE IS HIGH PRESSURE OVER THE EQUATOR, AND A LOW PRESSURE OVER THE POLES. THIS PRODUCES A NET FLOW FROM THE EQUATOR TO THE POLES. THIS FLOW PLUS THE CORIOLIS FORCE PRODUCES WESTERLIES. WINDS ARE GEOSTROPHIC PRESSURE GRADIENT INCREASES WITH ALTITUDE. THUS SO DOES THE WIND SPEED JET STREAMS ARE PART OF THE WESTERLIES
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Dish-pan Experiment
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Fig. 7-14, p. 199
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Fig. 7-15, p. 200 500 mb winds
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Fig. 7-16, p. 200 (A) Zonal flow pattern – air flows nearly parallel to latitudes (B) Meridional flow pattern – (C) Combination of the two flows
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TOMS Schematic
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Jet streams on March 11, 1990 The next slide is an image of the total column of ozone measured from a satellite. Ozone can be used to trace the changes in dynamics of the atmosphere. In this case it can be used to locate the jet streams. Note the undulations within the Jet streams (Rossby waves). Also note the cut off low.
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Jet Streams on March 11, 1990
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Rossby Waves http://www.youtube.com/watch?v=MIihKNKVOxs&NR=1
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WAVES IN THE WESTERLIES DISH PAN EXPERIMENT C. G. ROSSBY
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