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Which quantity does the Eliassen-Palm flux divergence measure?

  • A.The vertical flux of moisture carried upward by the waves through the depth of the troposphere present
  • B.The forcing of the mean flow by the waves
  • C.The rate at which wave energy is being dissipated by turbulence at the smallest scales of the motion
  • D.The wave amplitude

Answer: B

The divergence of the Eliassen-Palm vector gives the eddy forcing of the zonal mean flow, combining the effects of the eddy heat and momentum fluxes into a single quantity. Convergence of the flux decelerates the mean flow. This is the standard framework for wave-mean flow interaction studies in both the troposphere and the middle atmosphere.

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