Abstract
Measurements of the specular reflection of water-borne sound at the water-sea ice interface were made as a function of angle of incidence under the ice cover in Tanquary Fiord, Ellesmere Island, Northwest Territories, Canada, in 1969. A constant path length was maintained between sound source and detector; the transducers were carefully aligned to obviate the necessity of correcting for range and for directionality characteristics of the transducers. The amplitude reflection coefficient had a value near 0.1 for small angles of incidence, but its value increased rapidly with increasing angle of incidence beyond 30°. There was no apparent change in reflection coefficient over the frequency range 20 kHz to 450 kHz.
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