Discussion
Which frequency band do inertia-gravity waves occupy?
Answer: B
Including rotation modifies the gravity wave dispersion relation so that the frequency is bounded below by the Coriolis parameter and above by the buoyancy frequency. In the troposphere that band runs from a period of about 17 hours to about 10 minutes. Waves at the low frequency end are strongly affected by rotation and those at the high end are essentially pure gravity waves. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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