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Which mechanism carries most of that transport in mid-latitudes?

  • A.The mean meridional circulation, which transports heat directly poleward within its upper branch there
  • B.Ocean currents
  • C.Radiative transfer through the atmosphere, which carries energy poleward without any motion of the air
  • D.Baroclinic eddies

Answer: D

Travelling cyclones and anticyclones carry warm air poleward and cold air equatorward, accounting for the bulk of the mid-latitude transport. The mean meridional circulation dominates within the tropics through the Hadley cell, and the ocean carries a substantial share at low latitudes. Radiative transfer moves energy vertically far more effectively than horizontally. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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