Discussion
Which level acts as a critical level for a gravity wave?
Answer: C
At a critical level the intrinsic frequency of the wave vanishes, its vertical wavelength shrinks and the wave is absorbed, depositing its momentum into the mean flow. Critical level absorption is a principal mechanism of wave-mean flow interaction. A neutral layer does prevent propagation but by a different mechanism, and the tropopause acts as a partial reflector rather than as an absorber. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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