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The Atmosphere: Part 7: The Extratropical Circulation

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Presentation on theme: "The Atmosphere: Part 7: The Extratropical Circulation"— Presentation transcript:

1 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)

2 Roles of atmosphere and ocean
net ocean atmosphere Trenberth & Caron (2001)

3 Circulation in our 2D model
Ω f > 0 f = 0 f < 0

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5 Plenty of APE in middle and high latitudes
Hadley Cell T = Te Plenty of APE in middle and high latitudes

6 Experiment on rotating table with imposed temperature gradient
cold water bath hot water bath working fluid rotating turntable

7 Rapid rotation — baroclinic instability

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10 Atmospheric heat transport
tropics — direct overturning extratropics — eddy transport

11 Atmospheric heat transport
} Warm air upward and poleward Cold air downward and equatorward Efficient poleward heat transport

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13 Roles of atmosphere and ocean
net ocean atmosphere Trenberth & Caron (2001)

14 Angular momentum budget
Low level westerlies — loss of AM to surface through friction Low level easterlies — gain of AM from surface through friction

15 Atmospheric angular momentum transport

16 Observed angular momentum transport
total transient eddies stationary eddies (mean circulation)

17 Eddy angular momentum transport


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