Abstract
As a result of internal and surface tides, diurnal heating and cooling, and other phenomena, there is a slow temporal variation in the sound velocity in the ocean. The sound propagation from a periodic point source in an ocean with a temporally, slowly varying, sound velocity is analyzed by using a combination of the methods of, normal modes, two times, and stationary phase. We find that for a class of sound velocities, the order of magnitude of the pressure amplitude changes suddenly at a sequence of times, from large to small, and conversely. These “fades” are accompanied by phase shifts.
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