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    Low-frequency interaction between horizontal and overturning gyres in the ocean

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    2008GL035206.pdf (293.1Kb)
    Date
    2008-09-30
    Author
    Spall, Michael A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3374
    As published
    https://doi.org/10.1029/2008GL035206
    DOI
    10.1029/2008GL035206
    Keyword
     Thermohaline circulation; Climate variability 
    Abstract
    Low-frequency variability of the horizontal circulation in an idealized, eddy-permitting, numerical model drives the dominant mode of low-frequency variability in the meridional overturning circulation. This coupling takes place through the influence of lateral advection in the cyclonic high-latitude boundary current on the mixed layer depth along the boundary. The mean and low-frequency variability of the meridional overturning circulation are well predicted by a diagnostic estimate that assumes the downwelling is controlled by the thermal wind shear within the mixed layer along the boundary, which is in turn determined by a simple balance between lateral advection and surface cooling. The more general result is the demonstration that the mean and low frequency variability of the meridional overturning streamfunction are controlled by the baroclinic pressure gradient within the mixed layer along the boundary, which may be influenced by numerous factors such as low-frequency variability in lateral advection, wind stress, surface buoyancy fluxes, or ice melt and freshwater runoff.
    Description
    Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 35 (2008): L18614, doi:10.1029/2008GL035206.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Geophysical Research Letters 35 (2008): L18614
     
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