Abstract
Acoustic amplitude and phase fluctuations depend primarily upon variations of the acoustic index of refraction of the medium. Time series of experimental data of amplitude and phase fluctuations and of index of refraction were obtained for a nearshore environment off Southern California. A fixed narrow-beam ultrasonic source radiated CW pulses at 90 kHz at a rate of four pulses per second. Vertical thermocline movements related to internal waves induce time-dependent variations in the acoustic index of refraction and, as a consequence, variations in acoustic signals propagating in the ocean. Correlation functions and variances of the amplitude and phaser fluctuations and of the index of refraction are found and a comparison is made with the Komegorov-Obukhov two-thirds law for isotropic turbulence.
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