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Study Guide (lecture # 6)

Book pages: 73-77 in chapter 3; while in 6.2.3.2: 241-244

#### Review:

(lecture # 5)

- - radiative balance model improvements: e.g. radiative convective
model

- zonal mean zonal wind [u]

- zonal mean meridional wind [v]

- meridional-vertical plane stream function and meridional cells

#### Today's topics:

- - finish meridional cells discussion

- Hadley cell Simple theory: (i) angular momentum conservation for
subtropical jet & (ii) heat flux

- zonal mean pressure & height patterns

#### Jargon:

potential instability, Rayleigh friction, cloud amount, ISCCP

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Hadley cells upward motion, how? (§ 3.3, end)

- atmos. statically stable, MSE increases with height

- thunderstorms in tropics
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Chapter 6: (§6.2.3.2)

-Hadley cells: Conservation of angular momentum

- applied to meridional motion, the upper level flow:

- for "realistic" friction, need small [v] values for friction
to have time to act to keep [u] realistic

- these values similar to observed [v], so this is "zero order"
explanation of subtropical jets

Hadley cells: sufficient to transport heat?

- observed [v] and moist static energy sufficient to create
heat flux mandated by net radiation

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#### Pressure and heights (sect. 3.4):

- meridional gradient, relate to radiation, [T] and [u]

- seasonal change

- surface P in tropics

- time variability as a proxy for cyclone activity

- “model” of Hadley cell (fig. 3.22)