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Which conversion returns energy to the mean flow?

  • A.Latent heat release
  • B.Frictional dissipation, which converts the kinetic energy of the eddies into the internal energy of the air
  • C.Eddy kinetic to zonal kinetic energy during barotropic decay
  • D.Zonal to eddy available potential energy, which occurs during the growth phase of the baroclinic disturbance

Answer: C

During the decay phase the eddies tilt so that their momentum fluxes converge into the jet, accelerating the mean flow at their own expense. This is what maintains the surface westerlies against friction. Frictional dissipation removes energy from the system entirely rather than transferring it between reservoirs.

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