Abstract
During the CEAREX ’89 experiment in the Arctic Ocean, long-range (≊200 km) coherent transmissions from an air gun positioned off the coast of Greenland were received on a horizontal array deployed from a drifting ice sheet located in the Fram Straits. These multichannel data have been analyzed for covariance on spatial scales of ≤1 km. Because in general the vectors connecting the receiver pairs are not parallel to the wave front vector of the propagating signal, these data contain information on both in-plane and out-of-plane scattering off the sea ice canopy. Assuming a modal (discrete) mean signal structure, the elastic scattering perturbation theory of Kuperman and Schmidt [J. Acoust. Soc. Am. 86, 1511–1522 (1989)] is used to estimate the structure of the scattered field. Comparisons are made between the observed coherence and that predicted by the theory for various isotropic or nonisotropic surface roughness power spectra, including power law spectra. [Work supported by ONR.]
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