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    Sound channel propagation through eddies southeast of the Gulf Stream

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    WHOI 81-18.pdf (13.47Mb)
    Date
    1981-04
    Author
    Beckerle, John C.  Concept link
    Baxter, Lincoln  Concept link
    Porter, Robert P.  Concept link
    Spindel, Robert C.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/10238
    DOI
    10.1575/1912/10238
    Keyword
     Underwater acoustics; Eddies 
    Abstract
    Acoustical signals at 270 Hz from SOFAR floats drifting in the region southeast of the Gulf Stream were recorded during most of 1975 from a near axis sound channel hydrophone near Bermuda. The amplitude levels received exhibit a large increase (12–18 dB) commencing about 24 July, following a long period (March to July) of relatively lower peak level amplitudes. A major part of the increase can be attributed to the influence of a large cyclonic eddy (Gulf Stream ring) that passed slowly between the SOFAR floats and Bermuda. Such an eddy produces a large sound speed anomaly that extends to depths below the axis of the sound channel. On 24 July, two SOFAR floats were known to have approximately the same sound transmission path through the edge of the large eddy. The sound transmission peaks occur when no ocean eddy is between the SOFAR floats and the receiver. Their spacing shows they occur at regular refraction caustics in the sound channel. When the sound transmission path passes through an eddy, these transmission focal distances are shifted to greater range and the signal level may be greatly enhanced. The decrease of caustic peak intensities with range is 5 dB per double distance, and this agrees with theory. Several different levels of peak acoustic intensity occur and these result from two float depths and oceanic thermocline oscillations.
    Description
    Also published as: Journal of the Acoustical Society of America 68 (1980): 1750-1767
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • WHOI Technical Reports
    Suggested Citation
    Beckerle, J. C., Baxter, L., Porter, R. P., & Spindel, R. C. (1981). Sound channel propagation through eddies southeast of the Gulf Stream. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10238
     

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