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Which wavelength makes a Rossby wave stationary in a westerly flow?

  • A.The shortest wavelength present
  • B.The wavelength corresponding to the Rossby radius of deformation at the latitude concerned in the flow
  • C.The one whose westward intrinsic speed equals the eastward flow speed
  • D.The wavelength equal to the circumference of the latitude circle at which the wave is being observed

Answer: C

Setting the intrinsic westward phase speed equal and opposite to the advection by the mean flow gives the stationary wavelength, typically several thousand kilometres in mid-latitudes. Orographically forced waves adopt this wavelength because they must be stationary relative to the mountains. The deformation radius sets a different scale altogether.

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