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dc.contributor.author
Piola, Alberto Ricardo
dc.contributor.author
Campos, Edmo
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Möller, Osmar O.
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Charo, Marcela
dc.contributor.author
Martinez, Carlos
dc.date.available
2019-03-14T19:57:47Z
dc.date.issued
2000-03
dc.identifier.citation
Piola, Alberto Ricardo; Campos, Edmo; Möller, Osmar O.; Charo, Marcela; Martinez, Carlos; Subtropical Shelf Front off eastern South America; American Geophysical Union; Journal of Geophysical Research; 105; C3; 3-2000; 6565-6578
dc.identifier.issn
0148-0227
dc.identifier.uri
http://hdl.handle.net/11336/71691
dc.description.abstract
Historical hydrographic data from the continental shelf off eastern South America are used to examine the thermohaline properties of the water masses in the region between 20°S and 40°S. The continental shelf water masses are originated by dilution of open ocean waters of the western boundary currents of the South Atlantic Ocean. On the basis of temperature‐salinity relation, two distinct water masses are identified, namely, the Subantarctic Shelf Water and the Subtropical Shelf Water. Subantarctic Shelf Water originates by dilution of Subantarctic Water, primarily in the southeast Pacific, due to excess precipitation and continental runoff and enters the continental shelf near 55°S. The Subtropical Shelf Water is modified South Atlantic Central Water diluted by continental runoff from the coast of Brazil. In addition, substantial dilution of the upper shelf waters takes place at the mouth of Río de la Plata (approximately located at 36°S) and, in a lesser extent, at the Patos‐Mirim Lagoon (at 32°S). The Río de la Plata and the Patos outflows form a low‐salinity tongue that caps the shelf water leading to a salinity decrease to values <30. The low‐salinity tongue extends northward over the shelf penetrating farther north in winter than in summer. The extent of the low‐salinity water has a strong impact on the vertical stratification and acts to limit winter convection to the layer above the halocline. There is little or no indication of mixing between Subantarctic Shelf Water and Subtropical Shelf Water. An intense temperature, salinity, and nutrient front separates these water masses. The front is oriented along the north‐south direction, located on average near the 50 m isobath at 32°S and extends southward toward the shelf break near 36°S. Between 32° and 34°S the Subtropical Shelf Front follows the 100 to 200 m isobaths and separates Subantarctic Shelf Water from the oceanic South Atlantic Central Water. On the basis of the temperature and salinity distributions, beneath the low‐salinity surface layer, the Subtropical Shelf Front appears as an extension of the Brazil‐Malvinas Confluence over the continental shelf of South America. Thus the location of the Subtropical Shelf Front may be linked to the migrations of the separation point of the Brazil‐Malvinas Confluence from the continental slope.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Geophysical Union
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Geoquímica y Geofísica
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Subtropical Shelf Front off eastern South America
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-14T14:10:20Z
dc.journal.volume
105
dc.journal.number
C3
dc.journal.pagination
6565-6578
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Piola, Alberto Ricardo. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. 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
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Fil: Campos, Edmo. Universidade de Sao Paulo; Brasil
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Fil: Möller, Osmar O.. Universidade Federal do Rio Grande; Brasil
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Fil: Charo, Marcela. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina
dc.description.fil
Fil: Martinez, Carlos. Universidad de la República; Uruguay
dc.journal.title
Journal of Geophysical Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1029/1999JC000300
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/1999JC000300
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