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Deep Water Ocean Acoustics (DWOA): The Philippine Sea, OBSANP, and THAAW Experiments

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Technical Report

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Scripps Institution of Oceanography, University of California, San Diego La Jolla United States

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A wealth of novel data on deep-water acoustic propagation and ambient noise has been collected in a wide variety of environments over the last few years with ONR support, enabled in part by the development at SIO of a Distributed Vertical Line Array DVLA receiver. The DVLA makes feasible large-aperture vertical receiving arrays that were heretofore difficult or impossible to deploy Worcester et al., 2009. The experiments include the 1 NPAL Philippine Sea experiments, 2 2013 Ocean Bottom Seismometer Augmentation in the North Pacific OBSANP experiment, and 3 2013 THin-ice Arctic Acoustic Window THAAW experiment. All of these experiments are intended to improve our understanding of i the basic physics of low-frequency, broadband propagation in deep water, including the effects of oceanographic variability on signal stability and coherence, and ii the structure of the ambient noise field in deep water at low frequencies. The goal is to determine the fundamental limits to signal processing in deep water imposed by ocean processes, enabling advanced signal processing techniques to capitalize on the three-dimensional character of the sound and noise fields.

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