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    On the steadiness and instability of the Intermediate Western Boundary Current between 24 degrees and 18 degrees S

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    Article (3.033Mb)
    Date
    2019-12-06
    Author
    Napolitano, Dante C.  Concept link
    da Silveira, Ilson C. A.  Concept link
    Rocha, Cesar B.  Concept link
    Flierl, Glenn R.  Concept link
    Calil, Paulo H. R.  Concept link
    Martins, Renato P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/25428
    As published
    https://doi.org/10.1175/JPO-D-19-0011.1
    DOI
    10.1175/JPO-D-19-0011.1
    Keyword
     South Atlantic Ocean; Instability; Mesoscale processes; Intermediate waters; In situ oceanic observations; Quasigeostrophic models 
    Abstract
    The Intermediate Western Boundary Current (IWBC) transports Antarctic Intermediate Water across the Vitória–Trindade Ridge (VTR), a seamount chain at ~20°S off Brazil. Recent studies suggest that the IWBC develops a strong cyclonic recirculation in Tubarão Bight, upstream of the VTR, with weak time dependency. We herein use new quasi-synoptic observations, data from the Argo array, and a regional numerical model to describe the structure and variability of the IWBC and to investigate its dynamics. Both shipboard acoustic Doppler current profiler (ADCP) data and trajectories of Argo floats confirm the existence of the IWBC recirculation, which is also captured by our Regional Oceanic Modeling System (ROMS) simulation. An “intermediate-layer” quasigeostrophic (QG) model indicates that the ROMS time-mean flow is a good proxy for the IWBC steady state, as revealed by largely parallel isolines of streamfunction ψ⎯ and potential vorticity Q⎯; a ψ⎯−Q⎯ scatter diagram also shows that the IWBC is potentially unstable. Further analysis of the ROMS simulation reveals that remotely generated, westward-propagating nonlinear eddies are the main source of variability in the region. These eddies enter the domain through the Tubarão Bight eastern edge and strongly interact with the IWBC. As they are advected downstream and negotiate the local topography, the eddies grow explosively through horizontal shear production.
    Description
    Author Posting. © American Meteorological Society, 2019. 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 49(12), (2019): 3127-3143, doi: 10.1175/JPO-D-19-0011.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Napolitano, D. C., da Silveira, I. C. A., Rocha, C. B., Flierl, G. R., Calil, P. H. R., & Martins, R. P. (2019). On the steadiness and instability of the Intermediate Western Boundary Current between 24 degrees and 18 degrees S. Journal of Physical Oceanography, 49(12), 3127-3143.
     

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