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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/40475
Título: 
Numerical study of circulation on the inner Amazon Shelf
Autor(es): 
Instituição: 
  • Woods Hole Oceanog Inst Woods Hole MA USA
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Woods Hole Oceanog Inst
ISSN: 
1616-7341
Financiador: 
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Fundação para o Desenvolvimento da UNESP (FUNDUNESP)
Número do financiamento: 
  • CNPq: 200737/1997-0
  • CNPq: 307466/2004-3
  • CNPq: 309106/2007-9
  • FUNDUNESP: 742/2006
Resumo: 
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 Amapa coast (1.0 10(-4)), in contrast to values around 3.5 10(-3) for coarser sediment regions off the Para 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 M(2) 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.
Data de publicação: 
1-Nov-2008
Citação: 
Ocean Dynamics. Heidelberg: Springer Heidelberg, v. 58, n. 3-4, p. 187-198, 2008.
Duração: 
187-198
Publicador: 
Springer Heidelberg
Palavras-chaves: 
  • Circulation
  • Inner Amazon Shelf
  • Numerical modeling
Fonte: 
http://dx.doi.org/10.1007/s10236-008-0139-4
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/40475
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