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Which mechanism does the Eady solution describe?

  • A.The reflection of gravity waves between the two rigid boundaries that bound the flow above and below
  • B.Two counter-propagating edge waves phase-locking
  • C.The release of latent heat within the ascending branch of the growing wave as the moist air saturates
  • D.Frictional convergence beneath the surface low

Answer: B

Each boundary supports a wave propagating against the local flow, and at the most unstable wavelength the pair lock into a fixed phase relationship with a westward tilt and amplify each other. Growth therefore requires both. Latent heat is absent from the dry model although important in reality, friction is neglected entirely, and gravity wave reflection describes a different class of solution carrying no available potential energy.

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