Abstract
Observations from the Northeastern South China Sea shelf edge in May 2001 showed spectacular changes in the sound-speed profile, transmission loss, and signal coherence at low frequency. These significant acoustical fluctuations were induced by the passage of large-amplitude, nonlinear internal waves that depressed the shallow isotherms to the ocean bottom along the transmission path. In this talk, the measured statistics of transmission loss, temporal coherence, and horizontal coherence of a 400-Hz signal transmitted upslope from a moored sound source to an L-shaped hydrophone array are presented and discussed. Specifically, the discussion is focused on both the inter- and intradaily variability of these observed statistics of the sound field and their dependence on the strength and timing of the nonlinear internal waves. [The research is sponsored by ONR.]
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