&会 Held-Hou model -Strength of Hadley Cell Thermodynamic equation at equator and steady state: DΘ ΘE-Θ ∂0、ΘE-Θ Dt T W02 T If the static stability is mostly determined by the forcing instead of meridional circulation: 1∂日 △v Θ。∂z H H ΘE-Θ 5g△2HH2 ≈ Θo△yT 18a2T22△V Using mass continuity: gH032△2 H Characteristic overturning time a23T△V Td w scale can be estimated. 授课教师：张洋11授课教师：张洋 11 Held-Hou model -Strength of Hadley Cell 1 ⇥o @⇥ @z ⇡ ￾V H n If the static stability is mostly determined by the forcing instead of meridional circulation: n Thermodynamic equation at equator and steady state: w ⇡ H ⇥o￾V ⇥E ￾ ⇥ ⌧ = 5g￾2 HH2 18a2⌧⌦2￾V v ⇠ (gH) 3/2 ￾5/2 H a2⌦3⌧￾V ⌧d = H w Characteristic overturning time scale can be estimated. w @⇥ @z ⇡ ⇥E ￾ ⇥ ⌧ D⇥ Dt = ⇥E ￾ ⇥ ⌧ n Using mass continuity: