Abstract
Based upon previous studies of fixed-system acoustic-environmental relationships in the Straits of Florida, work on transmission fluctuations has been extended to the deep ocean. The model for the acoustic propagation study employs linear profiles for the sections at the surface and bottom, and hyperbolic cosines for the region about the minimum sound-velocity axis. Closed-form solutions are known for each profile segment, and combining these, the initial angles of all ray arrivals which reach a specified receiver from a given source are determined. By calculating travel time, spreading loss, and the boundary effects at the surface and bottom, the amplitude and phase (assuming CW transmission of a known frequency) of each arrival can be found. These arrivals, when summed as a function of time, yield the resultant acoustic time series for sound-speed profile variations derived from assumed amplitudes of internal tides of 2,4,7, and 10 m. These time series are compared with data. It is shown that the effect of surface tides on acoustic propagation in the deep ocean is minimal.
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