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    Pathways and mechanisms of offshore water intrusions on the Espírito Santo Basin shelf (18°S–22°S, Brazil)

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    Pal-czy_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf (9.637Mb)
    Date
    2016-07-30
    Author
    Palóczy, Andre  Concept link
    Brink, Kenneth H.  Concept link
    da Silveira, Ilson C. A.  Concept link
    Arruda, Wilton Z.  Concept link
    Martins, Renato P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8479
    As published
    https://doi.org/10.1002/2015JC011468
    DOI
    10.1002/2015JC011468
    Keyword
     Cross-shelf transport; Brazil current; Coastal dynamics; South Atlantic Central Water; Deep-ocean forcing; Arrested topographic wave 
    Abstract
    The pathways and physical mechanisms associated with intrusions of cold, nutrient-rich South Atlantic Central Water (SACW) on the continental shelf of the Espírito Santo Basin (ESB), off southeast Brazil (18°S–22°S), are investigated. To this end, a set of process-oriented, Primitive-Equation (PE) numerical models are used, together with an independent and more complete PE model, available observations and simple theoretical ideas. SACW enters the model ESB shelf mostly through two preferential pathways along the Tubarão Bight (TB, 19.5°S–22°S). These pathways are found to be locations where an equatorward along-isobath pressure gradient force (PGFy*) of inline image m s−2) develops in response to steady wind forcing. This equatorward PGFy* is essentially in geostrophic balance, inducing onshore flow across the shelf edge, and most of the shelf proper. The Brazil Current (BC) imparts an additional periodic (in the along-shelf direction) PGFy* on the shelf. The intrinsic pycnocline uplifting effect of the BC in making colder water available at the shelf edge is quantified. The BC also induces local intrusions by inertially overshooting the shelf edge, consistent with estimated Rossby numbers of inline image0.3–0.5. In addition, the planetary β-effect is related to a background equatorward PGFy*. A modified Arrested Topographic Wave model is shown to be a plausible rationalization for the shelf-wide spreading of the pressure field imparted by the BC at the shelf edge. The deep-ocean processes examined here are found to enhance the onshore transport of SACW, while wind forcing is found to dominate it at leading order.
    Description
    Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 5134–5163, doi:10.1002/2015JC011468.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Geophysical Research: Oceans 121 (2016): 5134–5163
     

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