Discussion
Which wave has both Rossby and gravity wave character?
Answer: C
The mixed Rossby-gravity or Yanai wave behaves like a gravity wave at high frequency and like a Rossby wave at low frequency, and it propagates westward in phase while carrying energy upward. It is one of the two wave types driving the quasi-biennial oscillation. Kelvin, inertia-gravity and Lamb waves each belong to a single family rather than bridging two. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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