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Which atmospheric wave is essentially non-dispersive?

  • A.The mixed Rossby-gravity wave, which changes character according to the frequency at which it is excited
  • B.The Kelvin wave
  • C.The Rossby wave, whose phase speed depends strongly on the square of the wavelength of the disturbance
  • D.The inertia-gravity wave

Answer: B

The equatorial Kelvin wave has a phase speed independent of wavenumber for a given vertical mode, so a packet travels without changing shape. This is why Kelvin wave signals cross an ocean basin as coherent pulses. Rossby and inertia-gravity waves are both strongly dispersive, and the mixed wave inherits dispersion from both of its parents.

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