AOSC200Lect13

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

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Unformatted text preview: AOSC 200 Lesson 13 Fig. 7.13 Subtropical and Polar jet streams in relation to the three cells 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 Dish-pan Experiment Fig. 7-14, p. 199 Fig. 7-15, p. 200 500 mb winds 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 TOMS Schematic 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. Jet Streams on March 11, 1990 Rossby Waves http://www.youtube.com/watch?v=MIihKNKVOxs&NR=1 WAVES IN THE WESTERLIES...
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This note was uploaded on 01/30/2012 for the course AOSC 200 taught by Professor Hudson during the Fall '08 term at Maryland.

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

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