ARCTIC ACOUSTIC TRANSMISSION LOSS AND AMBIENT NOISE
GM DEFENSE RESEARCH LABS SANTA BARBARA CA SEA OPERATIONS DEPT
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A model is advanced to predict arctic underwater acoustic attenuation that allows some spherical and some cylindrical divergence, coupled with a reflection loss per unit distance. Data collected from a variety of sources of measurements of arctic transmission losses are used to derive reflection loss and to compare with the model. The standard deviation of error between measurements and model is found to be plus or minus 5 db at the lowest and plus or minus 6 at the highest frequency of measurement. The effects on transmission loss of such factors as source, receiver and bottom depths are discussed. The results of a year-long measurement program at Ice Island T-3 to study arctic ambient noise are given.