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Which assumption limits the validity of a dispersion relation so obtained?

  • A.The atmosphere must be barotropic so that the wave has no vertical structure within the layer concerned
  • B.The wave amplitude must remain small
  • C.The basic state must be at rest so that no advection of the perturbation can occur during the analysis
  • D.The wave must be stationary

Answer: B

Linearisation requires the perturbation to be small enough that products of perturbation quantities may be neglected, which fails once a wave grows to large amplitude or begins to break. A moving basic state is perfectly acceptable and simply Doppler shifts the frequency. Stationarity and barotropy are special cases rather than requirements of the method.

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