Frequency spectra of acoustic fluctuations caused by oceanic internal waves and other finestructure

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Abstract
The frequency spectrum of log-amplitude fluctuations is substantially modified (flattened) by a previously neglected effect: the vertical advection of short internal waves by the more energetic internal waves with large vertical wavelength. The log-amplitude spectrum is sensitive to this vertical advection and to curvature of the equilibrium sound ray, whereas the phase spectrum is not. Noninternal-wave ’’frozen’’ finestructure contributes to the log-amplitude frequency spectrum through vertical advection, but not to the phase spectrum. The Cobb Seamount experiment is treated as an example; the spectrum of the modified theory agrees well with observations except at high frequency ( near the buoyancy frequency ).

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