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Which property does an equatorial Kelvin wave have?

  • A.Westward propagation
  • B.An amplitude that increases steadily with distance from the equator on both sides of the waveguide
  • C.No meridional velocity component
  • D.A meridional velocity that reaches its maximum exactly on the equator itself where the wave is trapped

Answer: C

The Kelvin wave has zero meridional velocity everywhere, with the pressure gradient in that direction balanced entirely by the Coriolis force acting on the zonal wind. This constraint traps it about the equator with a Gaussian decay and forces it to propagate eastward only. The amplitude therefore decreases rather than increases away from the equator.

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