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
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Hadley cells upward motion, how? (§ 3.3, end)
- atmos. statically stable, MSE increases with height
- thunderstorms in tropics
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
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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)