On the Detection of “Inertial” Waves with Pycnocline Followers

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Abstract
The vertical displacements associated with oscillations near the local inertial frequency f, in a stratified ocean, are found to be significant, even very close to f. For a frequency, ω=(1+ϵ)f, the ratio of rms vertical velocity to horizontal velocity is O(ϵ1/2). Observations near Hawaii, made with a recently developed pycnocline follower, show inertial oscillation events similar to those found by Webster in current meter records, and discussed theoretically by Crepon and by Pollard.

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