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dc.contributor.authorNapolitano, Dante C.  Concept link
dc.contributor.authorda Silveira, Ilson C. A.  Concept link
dc.contributor.authorRocha, Cesar B.  Concept link
dc.contributor.authorFlierl, Glenn R.  Concept link
dc.contributor.authorCalil, Paulo H. R.  Concept link
dc.contributor.authorMartins, Renato P.  Concept link
dc.date.accessioned2020-02-24T16:40:47Z
dc.date.available2020-06-06T09:40:55Z
dc.date.issued2019-12-06
dc.identifier.citationNapolitano, 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.en_US
dc.identifier.urihttps://hdl.handle.net/1912/25428
dc.descriptionAuthor 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.en_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipWe thank Frank O. Smith for copy editing and proofreading this manuscript. This study was financed in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES, Brazil—Finance Code 001 and by Projeto REMARSUL (Processo CAPES 88882.158621/2014-01), Projeto VT-Dyn (Processo FAPESP 2015/21729-4) and Projeto SUBMESO (Processo CNPq 442926/2015-4). Rocha was supported by a WHOI Postdoctoral Scholarship.en_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JPO-D-19-0011.1
dc.subjectSouth Atlantic Oceanen_US
dc.subjectInstabilityen_US
dc.subjectMesoscale processesen_US
dc.subjectIntermediate watersen_US
dc.subjectIn situ oceanic observationsen_US
dc.subjectQuasigeostrophic modelsen_US
dc.titleOn the steadiness and instability of the Intermediate Western Boundary Current between 24 degrees and 18 degrees Sen_US
dc.typeArticleen_US
dc.description.embargo2020-06-06en_US
dc.identifier.doi10.1175/JPO-D-19-0011.1


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