Discussion
Consider the following statements about internal gravity waves.
1. Their frequency cannot exceed the buoyancy frequency.
2. Their amplitude grows as they propagate upward.
3. Their group velocity is parallel to their phase velocity.
Which of the statements given above is or are correct?
Answer: A
The first two statements are correct, but the group velocity of an internal gravity wave is perpendicular rather than parallel to the phase velocity. That perpendicularity is the most distinctive property of the wave type and is what allows the direction of energy transport to be inferred from the tilt of the phase lines in an observed time-height section.
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