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The Atmosphere: Part 5: Large-scale motions

The Atmosphere: Part 5: Large-scale motions. 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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The Atmosphere: Part 5: Large-scale motions

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  1. The Atmosphere:Part 5: Large-scale motions • Composition / Structure • Radiative transfer • Vertical and latitudinalheat transport • Atmospheric circulation • Climate modeling Suggested further reading: Holton, An Introduction to Dynamical Meteorology (Academic Press, 1979)

  2. Calculated rad-con equilibrium T vs. observed T pole-to-equator temperature contrast too big in equilibrium state (especially in winter)

  3. Zonally averaged net radiation Diurnally-averaged radiation Observed radiative budget Implied energy transport: requires fluid motions to effect the implied heat transport

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

  5. Basic dynamical relationships Ω Equation of motion Ω Ωsinφ u φ Shallow atmosphere: } z - coordinates } p - coordinates

  6. Basic dynamical relationships Ω Equation of motion Ω Ωsinφ u φ Shallow atmosphere: } z - coordinates

  7. Basic dynamical relationships Ω Equation of motion Ω Ωsinφ u φ Shallow atmosphere: } z - coordinates } p - coordinates

  8. Geostrophic balance

  9. Geostrophic balance thermal wind shear balance

  10. Rotating vs. nonrotating fluids

  11. Rotating vs. nonrotating fluids

  12. Rotating vs. nonrotating fluids Ω Ω f > 0 Ωsinφ u φ f = 0 f < 0

  13. Atmospheric energetics:where does the energy of atmospheric motions come from? Flattening density/temperature surfaces always reduces potential energy

  14. Atmospheric energetics:where does the energy of atmospheric motions come from? Flattening density/temperature surfaces always reduces potential energy Available potential energy inherent in density/temperature gradients

  15. Atmospheric energetics:where does the energy of atmospheric motions come from? Flattening density/temperature surfaces always reduces potential energy Available potential energy inherent in density/temperature gradients In order to generate available potential energy, on average must heat where hot and cool where cold: < JT > > 0

  16. Atmospheric energetics:where does the energy of atmospheric motions come from? Flattening density/temperature surfaces always reduces potential energy Available potential energy inherent in density/temperature gradients In order to generate available potential energy, on average must heat where hot and cool where cold: < JT > > 0 In order to release available potential energy (and generate motion), on average, warm air must rise, cold air sink: < wT > > 0

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