Deep-Ocean Sound Attenuation in the Sub- and Low-Kilocycle-per-Second Region

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Abstract
An experiment was conducted to provide an empirical evaluation of attenuation in sea water in the frequency range of 354–3540 cps. Recordings were made of solar shots detonated every 5 miles along a 500-mile track. The receiving elements were located near the axis of the sofar channel. An analysis is outlined both in terms of received energy spectrum and transmission loss as a function of range. The experimental data have been statistically fitted by least-squares methods to a mathematical model of the form NW = H0+10 log R+aR, where H0 represents the transmission loss in excess of inverse first-power spreading. These results have been combined with those from a subsequent experiment, conducted in the same geographical area, that extended the frequency coverage to 112 cps. The regression line fitting the joint set of coefficients to an upper limit of 1780 cps is given by a = 5.42×10−5 fkcps1.50 dB/yd. The present evaluation is compared with other results, and an apparent systematic anomaly is discussed.

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