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Which jet owes its existence to angular momentum conservation as well as thermal wind?

  • A.The subtropical jet
  • B.The polar front jet, which lies above the boundary between polar and mid-latitude air masses
  • C.The nocturnal low level jet
  • D.The African easterly jet, which forms above the temperature contrast at the edge of the Sahara

Answer: A

The subtropical jet sits at the poleward edge of the Hadley cell, where air that has conserved angular momentum while moving poleward arrives with a large westerly velocity. It also satisfies the thermal wind relation with respect to the tropical to subtropical temperature gradient. The polar front jet is more purely a thermal wind feature. The nocturnal and African jets have quite different origins in inertial oscillation and in a reversed temperature gradient.

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