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Published byCrystal Anderson Modified over 8 years ago
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The Atmosphere: Part 7: The Extratropical Circulation
Composition / Structure Radiative transfer Vertical and latitudinal heat transport Atmospheric circulation Climate modeling Suggested further reading: Holton, An Introduction to Dynamical Meteorology (Academic Press, 1979)
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Roles of atmosphere and ocean
net ocean atmosphere Trenberth & Caron (2001)
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Circulation in our 2D model
Ω f > 0 f = 0 f < 0
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Plenty of APE in middle and high latitudes
Hadley Cell T = Te Plenty of APE in middle and high latitudes
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Experiment on rotating table with imposed temperature gradient
cold water bath hot water bath working fluid rotating turntable
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Rapid rotation — baroclinic instability
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Atmospheric heat transport
tropics — direct overturning extratropics — eddy transport
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Atmospheric heat transport
} Warm air upward and poleward Cold air downward and equatorward Efficient poleward heat transport
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Roles of atmosphere and ocean
net ocean atmosphere Trenberth & Caron (2001)
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Angular momentum budget
Low level westerlies — loss of AM to surface through friction Low level easterlies — gain of AM from surface through friction
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Atmospheric angular momentum transport
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Observed angular momentum transport
total transient eddies stationary eddies (mean circulation)
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Eddy angular momentum transport
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