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Discussion

Which four reservoirs appear in the Lorenz energy cycle?

  • A.Zonal and eddy available potential energy and zonal and eddy kinetic energy
  • B.Internal potential kinetic and latent energy, considered for the atmosphere as a whole rather than by component
  • C.Radiative latent sensible and kinetic energy
  • D.Available potential energy divided among the four seasons at each latitude of the globe throughout the year

Answer: A

Lorenz divided both available potential energy and kinetic energy into zonal mean and eddy parts, giving four reservoirs connected by conversion terms. The dominant pathway runs from zonal available potential energy through the eddy form to eddy kinetic energy and finally to zonal kinetic energy. Mapping the observed magnitudes onto that diagram summarises the general circulation compactly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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