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Which balance closes the cycle in the long term mean?

  • A.The poleward heat transport by the eddies equals the radiative imbalance at the top of the atmosphere above
  • B.Latent heat release equals precipitation
  • C.The conversion from available potential to kinetic energy equals the conversion back again in the opposite sense
  • D.Generation by differential heating equals frictional dissipation

Answer: D

In a steady state the generation of available potential energy by differential heating must equal the frictional dissipation of kinetic energy, since the intermediate conversions merely move energy between reservoirs. Tracing the energy from the ultimate source to the ultimate sink through the four reservoirs is the point of the diagram. The eddy heat transport is one of the internal conversions rather than a sink.

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