Pressure dependence of the acoustic relaxation frequency associated with MgSO4 in the ocean

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Abstract
Utilizing horizontal transmission paths located at various depths in the ocean, the attenuation of sound waves has been measured at nominal frequencies of 30, 45, 60, 75, 90, and 145 kHz. Analysis of the data indicates that both the relaxation frequency at 50 kHz, which is usually attributed to the presence of MgSO4 in the sea, and the associated compressibility are functions of pressure. As pressure increases, the relaxation frequency shifts upward with a corresponding downward shift in the chemical compressibility. Results are also given for the pressure coefficient of attenuation which permit more precise predictions of acoustic attenuation at frequencies within the range of this experiment.

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