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Acoustic Propagation in the Labrador Sea
NAVAL RESEARCH LAB WASHINGTON DC
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A LRAPP-sponsored transmission-loss survey of the Laborador Sea was made during July 1972 at the acoustic frequency of 50 Hz. The objective was to provide data to guide any future extensive and detailed studies of the Labrador Sea which would be relevant to future surveillance systems. Transmission loss was obtained using Mk 61 and Mk 82 SUS charges detonated at 18.3 and 91.4 m respectively dropped from aircraft, with the signals received on ship-suspended hydrophones 305 and 914 m deep and buoy-deployed hydrophones 1628, 2515, 3252, and 3706 m deep. A transmission-loss contour chart of the Labrador Sea is presented for the 914-m-deep hydrophone and 18.3-m-deep source. The effect of source and receiver depths are discussed the optimum passive system depth is projected to be within the interval 200 to 900 m. Details of transmission loss vs range, sound-speed profiles, and bathymetric features are included, providing the required data to illustrate and support conclusions.
APPROVED FOR PUBLIC RELEASE