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dc.contributor.author
Zhang, Tianyi
dc.contributor.author
Yankovsky, Alexander E.
dc.contributor.author
Piola, Alberto Ricardo
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dc.contributor.author
Valla, Daniel
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dc.date.available
2020-02-21T19:34:23Z
dc.date.issued
2018-09
dc.identifier.citation
Zhang, Tianyi; Yankovsky, Alexander E.; Piola, Alberto Ricardo; Valla, Daniel; Observations of semidiurnal internal tides on the Patagonian Shelf; Pergamon-Elsevier Science Ltd; Continental Shelf Research; 167; 9-2018; 46-54
dc.identifier.issn
0278-4343
dc.identifier.uri
http://hdl.handle.net/11336/98323
dc.description.abstract
The Patagonian Shelf in the western South Atlantic is known for strong semidiurnal tides and intense seasonal stratification. Both observations and models reveal substantial cross-isobath tidal energy fluxes at the shelf break between 44 and 41°S. These conditions are potentially favorable for internal wave generation, but global tidal models do not show significant baroclinic energy radiation from this region. A possible explanation for the lack of offshore radiation is explored through analyzing the data from two moorings deployed along the Patagonian shelf break. At both mooring sites, the velocity spectra reveal strong baroclinic oscillations at the semidiurnal frequency with a vertical structure resembling the first mode. Unlike barotropic tides with strong cross-isobath polarization, the baroclinic tidal ellipses are less polarized. Internal tide propagation is delineated by estimating a proxy for the baroclinic energy flux, which is the product of band-passed baroclinic velocity near the bottom and temperature at mid-depth. The proxy vectors show that internal tide propagation is highly sensitive to the strength of the Malvinas Current propagating northward over the continental slope. When the mean current becomes stronger, the proxy vectors turn southward, pointing upstream of the Malvinas Current direction. It is concluded that the presence of an energetic western boundary current reduces the offshore radiation of internal tides, likely due to the wave refraction on the mean current.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
INTERNAL WAVES
dc.subject
MEAN CURRENT
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PATAGONIAN SHELF
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REFRACTION
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THE MALVINAS CURRENT
dc.subject
TIDES
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Observations of semidiurnal internal tides on the Patagonian Shelf
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-02-18T16:07:11Z
dc.journal.volume
167
dc.journal.pagination
46-54
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Zhang, Tianyi. University of South Carolina; Estados Unidos
dc.description.fil
Fil: Yankovsky, Alexander E.. University of South Carolina; Estados Unidos
dc.description.fil
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina
dc.description.fil
Fil: Valla, Daniel. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Continental Shelf Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0278434317306386
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.csr.2018.08.004
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