Discussion
P and Q respectively describe flow fields corresponding to
Answer: B
P and Q are equatorial Rossby and equatorial Kelvin waves.
Both patterns are organised about the equator, so they are equatorially trapped waves, not mid-latitude or polar ones. In P the pressure cells lie off the equator with opposite signs to north and south, with flow circling each cell and crossing the equator: the Rossby-type equatorial wave with cross-equatorial flow (the mixed Rossby-gravity, or Yanai, wave). In Q the highs and lows are centred on the equator and the wind is purely east-west, in geostrophic balance with the north-south pressure gradient: the equatorial Kelvin wave, which has no meridional velocity.
Option D reverses the two, and options A and C name mid-latitude and polar waves, which these equator-centred patterns are not.
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