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Acoustic travel-time perturbations due to shallow-water internal waves and internal tides in the Barents Sea Polar Front: Theory and experiment

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Authors
Lynch, James F.
Jin, Guoliang
Pawlowicz, Richard
Ray, Douglas
Plueddemann, Albert J.
Chiu, Ching-Sang
Miller, James H.
Bourke, Robert H.
Parsons, A. Rost
Muench, Robin
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Date of Issue
1996
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Abstract
During August 1992, a combined acoustics/physical oceanography experiment was performed to study both the acoustical properties and the ocean dynamics of the Barents Sea Polar Front in the region near Bear Island. Oceanographic observations from shipboard hydrography and moored sensors allowed the construction of the internal wave frequency spectrum for the area. A rapidly sampled tomographic section from a 224‐Hz, 16‐Hz‐bandwidth acoustic source to a 16‐element vertical receiving array enabled the monitoring of travel‐time fluctuations over the internal wave frequency band. To describe the measured acoustic fluctuations, theoretical expressions have been developed for the travel‐time variances which are functions of the internal wave oceanographic field, the local acoustic propagation characteristics, and the acoustical system’s properties. Both ray and mode theory expressions are generated, as the experiment was performed in shallow water and both ray and mode arrivals were resolvable. Comparison of the theory with the data shows generally good agreement. However, due to the fact that the internal wave study is a secondary objective of this experiment, the data are not of the quality eventually hoped for. Directions for future research in this area are outlined and discussed.
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Article
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The article of record as published may be found at https://doi.org/10.1121/1.414657
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Naval Postgraduate School (U.S.)
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19 p.
Citation
Lynch, James F., et al. "Acoustic travel‐time perturbations due to shallow‐water internal waves and internal tides in the Barents Sea Polar Front: Theory and experiment." The Journal of the Acoustical Society of America 99.2 (1996): 803-821.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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