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Which surface feature marks the descending branch?

  • A.The polar front
  • B.The equatorial trough, which is the belt of low pressure found close to the equator throughout the year
  • C.The subtropical high pressure belt
  • D.The intertropical convergence zone, which lies instead beneath the ascending branch near the thermal equator

Answer: C

Subsidence near 30 degrees produces the semi-permanent anticyclones of the subtropical oceans and the great deserts of both hemispheres. The convergence zone and equatorial trough lie beneath the ascending branch and the polar front belongs to the mid-latitude baroclinic zone. The distribution of the world's arid regions is thus a direct consequence of the general circulation. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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