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  • 1
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1992
    In:  The Journal of the Acoustical Society of America Vol. 92, No. 4_Supplement ( 1992-10-01), p. 2326-2326
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 92, No. 4_Supplement ( 1992-10-01), p. 2326-2326
    Abstract: Variability of the mesoscale eddy field in a region just south of the Gulf Stream has been monitored via acoustic tomography. For 10 months (November 1988 through August 1989), a pentagonal array of tomographic transceivers was situated in a region centered at 38°N, 55°W. The tomographic array was part of the eastern array of the SYNOP (SYNoptic Ocean Prediction) experiment. This region is one rich in mesoscale energy, with the influence of local Gulf Stream meandering and cold core ring activity strikingly evident. The tomographic data set has been analyzed and a view of the temperature, current velocity, and vorticity fields has been revealed. The signature of cold core rings is clearly seen in these sections. Spectra are estimated from the tomographic time series, and are shown to be consistent with concurrent current meter data. Second-order statistics, such as heat and momentum fluxes, are also estimated. The integrating nature of the tomographic measurement has been exploited to shed some light on the radiation of eddy energy from the Gulf Stream.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1992
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1989
    In:  The Journal of the Acoustical Society of America Vol. 85, No. 5 ( 1989-05-01), p. 1958-1966
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 85, No. 5 ( 1989-05-01), p. 1958-1966
    Abstract: In this paper, data from a Gulf Stream tomographic experiment carried out in October 1984 are analyzed. The experiment used acoustic sources and receivers bottom mounted beneath the stream to measure Gulf Stream dynamics. However, due to an unfortunate electronic malfunction of the source, only 2 days of acoustically measured travel time data are available. Nevertheless, some new and positive results are obtained. Bottom reflected acoustic rays having up to two bottom bounces are unambiguously identified by solving the direct problem of tracing rays both in a reference climatological profile and in actual range-dependent sound-speed sections from a hydrographic survey carried out during the experiment. It is also shown that these rays do not appear to be affected by important nonlinearities so that they can be used to provide consistent results in inverse solutions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1989
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1990
    In:  The Journal of the Acoustical Society of America Vol. 88, No. S1 ( 1990-11-01), p. S118-S118
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 88, No. S1 ( 1990-11-01), p. S118-S118
    Abstract: Mesoscale variability of the Gulf Stream southern recirculation gyre has been investigated via acoustic tomography. A reciprocal tomographic experiment was carried out in the region just south of the Gulf Stream mean path at 37N, 55W. A pentagonal array of transceivers, with a nominal leg separation of 100 km, transmitted a pseudorandom sequence at a frequency of 400 Hz, with a bandwidth of 100 Hz. The experiment lasted for 10 months from October 1988 through August 1989. Travel-time inversions for temperature, current velocity, and vorticity have been calculated for the array. The oceanography of the region is shown to be largely influenced by local meandering of the GulfStream and its associated Rossby wave radiation field. The estimated time series of area-averaged relative vorticity shows the most important fluctuations to occupy the mesoscale frequency band.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1990
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 78, No. 1 ( 1985-07-01), p. 260-263
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 78, No. 1 ( 1985-07-01), p. 260-263
    Abstract: A reference sound-speed profile is constructed by averaging many historical sound-speed profiles near the Gulf Stream. The travel times and geometries of steep acoustic rays between bottom-mounted sources and receivers are computed for the reference profile. The ranges are between 20 and 100 km and the ray paths which are analyzed reflect from the surface and/or the bottom. Travel times and geometries are also calculated for the same rays for sound-speed profiles computed from a measured hydrographic section which traversed the Gulf Stream. The exact travel time differences of the rays between the measured and reference profiles are compared with a linear approximation to the exact travel time differences. The linear approximation is typically within 10% of the exact travel time difference. The difference in depth of a ray path traced through the reference profile and the corresponding path traced through the measured profile is typically less than 100 m. Linearized inversion schemes should be adequate for mapping Gulf Stream variability.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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