设雾 Hadley Cell Role of eddies* Qualitative considerations D 8 Di-at acosΦaλaab In an axisymmetric flow ([M]=M): -cmi In a 3-D(with eddies)flow,the zonally averaged angular momentum: Neglecting vertical advection,vertical eddy fluxes and friction: olm]lolm] acaei2erhoms2 1 20 [w] b Eddy momentum flux always 10 acts to decrease the angular momentum of the zonal flow, and the zonal velocity is lower than UM. Observations -20 10 授课教师：张洋9授课教师：张洋 @[m] @t + [v] a @[m] @￾ = ￾ 1 a cos ￾ @ @￾([u⇤v⇤]a cos2 ￾) 9 Hadley Cell : Role of eddies* ! Qualitative considerations D Dt M = ￾1 ⇢ @p @￾ + a cos ￾F￾ In an axisymmetric flow ([M]=M): D Dt[M] = a cos ￾[F￾] In a 3-D (with eddies) flow, the zonally averaged angular momentum: D Dt = @ @t + u a cos ￾ @ @￾ + v a @ @￾ + w @ @z , where Neglecting vertical advection, vertical eddy fluxes and friction: http://www.adultpdf.com Created by Image To PDF trial version, to remove this mark, please register this software. Observations Eddy momentum flux always acts to decrease the angular momentum of the zonal flow, and the zonal velocity is lower than UM