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    A dynamical interpretation of low frequency motions near very rough topography : the Charlie Gibbs Fracture Zone

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    WHOI 81-23.pdf (11.04Mb)
    Date
    1981-04
    Author
    Hogg, Nelson G.  Concept link
    Schmitz, William J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10243
    DOI
    10.1575/1912/10243
    Keyword
     Ocean bottom; Submarine topography; Charles Gibbs Fracture Zone 
    Abstract
    As a sequel to Schmitz and Hogg (1978), nine-month moored observations of current and temperature from the Charlie Gibbs Fracture Zone are further described, and then interpreted in terms of low frequency quasigeostrophic motions. Large vertical and horizontal changes are observed in the variance of both mean and fluctuating components. It is demonstrated that these changes could be associated with the (complex) nature of the topography. With regard to the mean flow, it is shown through an advective model that the topography is sufficiently steep to force this motion to closely follow isobaths. Time-dependent motions for periods from 2 to 96 days are described using the technique of empirical orthogonal functions. The most energetic mode is always bottom trapped, with flow oriented along isobaths at lower frequencies and approaching equipartition of along- and cross-isobath motions at higher frequencies. At the lowest frequencies a second mode which increases upward in energy is also judged significant, while for periods shorter than 3.6 days the second mode is again highly bottom trapped. We interpret these motions using linear wave theory. There is relatively close correspondence between theory and observation when the effects of both large- and small-scale topographic features are included in the model calculations. In addition to the usual topographic wave, the abrupt slope changes on the north wall allow for a baroclinic fringe mode with a ncar bottom node at low frequencies and small-scale bottom corrugations force highly bottom trapped waves above the smooth slope cut-off frequency.
    Description
    Also published as: Journal. of Marine Research 38 (1980): 215-248
    Collections
    • Physical Oceanography (PO)
    • WHOI Technical Reports
    Suggested Citation
    Hogg, N. G., & Schmitz, W. J. (1981). A dynamical interpretation of low frequency motions near very rough topography: the Charlie Gibbs Fracture Zone. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10243
     

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