Abstract
Cavity resonators with acoustically soft side walls were developed for measuring sound attenuation in sea water. The equipment is capable of such measurements at discrete frequencies between 5 and 8 kc/sec, in the range from 10–200 dB/kyd. Natural sea water with suspended particulate matter and high oxygen content showed attenuation in the whole range in contrast to either distilled or clean sea water, which produced no measurable attenuation. It is suggested that fine bubbles or bubble nuclei may account for the excess attenuation. The above-mentioned conditions and results correlate well with earlier field measurements, where anomalous attenuations were observed.
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