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Which stratospheric circulation does that framework reveal clearly?

  • A.The Hadley circulation, whose ascending branch lies beneath the intertropical convergence zone in the tropics
  • B.The Walker circulation
  • C.The polar vortex, which is a zonal rather than a meridional feature of the winter stratospheric flow
  • D.The Brewer-Dobson circulation

Answer: D

The Brewer Dobson circulation rises in the tropics, moves poleward and descends at high latitudes, transporting ozone from its tropical source region towards the poles. It is driven by wave breaking rather than by heating and appears clearly only in the transformed framework. The Hadley and Walker circulations are tropospheric, and the polar vortex is a zonal flow.

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