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Numerical study of circulation on the inner Amazon Shelf

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Abstract

We studied the circulation on the coastal domain of the Amazon Shelf by applying the hydrodynamic module of the estuarine and coastal ocean model and sediment transport. The first barotropic experiment aimed to explain the major bathymetric effects on tides and those generated by anisotropy in sediment distribution. We analyzed the continental shelf response of barotropic tides under realistic bottom stress parametrization (C d ), considering sediment granulometry obtained from a faciologic map, where river mud deposits and reworked sediments areas are well distinguished, among others classes of sediments. Very low C d values were set in the fluid mud regions off the Amapá coast (1.0 10 − 4), in contrast to values around 3.5 10 − 3 for coarser sediment regions off the Pará coast. Three-dimensional experiments represented the Amazon River discharge and trade winds, combined to barotropic tide influences and induced vertical mixing. The quasiresonant response of the Amazon Shelf to the M2 tide acts on the local hydrodynamics by increasing tidal admittance, along with tidal forcing at the shelf break and extensive fluid mud regions. Harmonic analysis of modeled currents agreed well with the analysis of the AMASSEDS observational data set. Tidal-induced vertical shear provided strong homogenization of threshold waters, which are subject to a kind of hydraulic control due to the topographic steepness. Ahead of the hydraulic jump, the low-salinity plume is disconnected from the bottom and acquires negative vorticity, turning southeastward. Tides act as a generator mechanism and topography, via hydraulic control, acts as a maintainer mechanism for the low-salinity frontal zone positioning. Tidally induced southeastward plume fate is overwhelmed by northwestward trade winds so that they, along with background circulation, probably play the most important role on the plume fate and variability over the Amazon Shelf.

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Authors and Affiliations

  1. Universidade Estadual Paulista, São Paulo, Brazil

    Roberto Fioravanti Carelli Fontes

  2. Instituto Oceanográfico da Universidade, de São Paulo, São Paulo, Brazil

    Belmiro Mendes Castro

  3. Woods Hole Oceanographic Institution, Woods Hole, MA, USA

    Robert C. Beardsley

Authors
  1. Roberto Fioravanti Carelli Fontes
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  2. Belmiro Mendes Castro
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  3. Robert C. Beardsley
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Correspondence to Roberto Fioravanti Carelli Fontes.

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Responsible editor: Joachim Dippner

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Fontes, R.F.C., Castro, B.M. & Beardsley, R.C. Numerical study of circulation on the inner Amazon Shelf. Ocean Dynamics 58, 187–198 (2008). https://doi.org/10.1007/s10236-008-0139-4

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  • DOI: https://doi.org/10.1007/s10236-008-0139-4

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