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    Wind sea behind a cold front and deep ocean acoustics

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    jpo-d-15-0221%2E1.pdf (1.779Mb)
    Date
    2016-05-10
    Author
    Farrell, W. E.  Concept link
    Berger, Jonathan  Concept link
    Bidlot, Jean-Raymond  Concept link
    Dzieciuch, Monika  Concept link
    Munk, Walter H.  Concept link
    Stephen, Ralph A.  Concept link
    Worcester, Peter F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8067
    As published
    https://doi.org/10.1175/JPO-D-15-0221.1
    DOI
    10.1175/JPO-D-15-0221.1
    Keyword
     Atm/Ocean Structure/ Phenomena; Atmosphere-ocean interaction; Cold fronts; Marine boundary layer; Sea state 
    Abstract
    A rapid and broadband (1 h, 1 < f < 400 Hz) increase in pressure and vertical velocity on the deep ocean floor was observed on seven instruments comprising a 20-km array in the northeastern subtropical Pacific. The authors associate the jump with the passage of a cold front and focus on the 4- and 400-Hz spectra. At every station, the time of the jump is consistent with the front coming from the northwest. The apparent rate of progress, 10–20 km h−1 (2.8–5.6 m s−1), agrees with meteorological observations. The acoustic radiation below the front is modeled as arising from a moving half-plane of uncorrelated acoustic dipoles. The half-plane is preceded by a 10-km transition zone, over which the radiator strength increases linearly from zero. With this model, the time derivative of the jump at a station yields a second and independent estimate of the front’s speed, 8.5 km h−1 (2.4 m s−1). For the 4-Hz spectra, the source physics is taken to be Longuet-Higgins radiation. Its strength depends on the quantity , where Fζ is the wave amplitude power spectrum and I the overlap integral. Thus, the 1-h time constant observed in the bottom data implies a similar time constant for the growth of the wave field quantity behind the front. The spectra at 400 Hz have a similar time constant, but the jump occurs 25 min later. The implications of this difference for the source physics are uncertain.
    Description
    Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 46 (2016): 1705-1716, doi:10.1175/JPO-D-15-0221.1.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of Physical Oceanography 46 (2016): 1705-1716
     

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