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Abstract:

The northward outflow of cold, dense water from the Weddell Sea into the world ocean basins plays a key role in balancing the global heat budget. We estimate the geostrophic flow patterns in the northwestern Weddell Sea using box inverse methods applied to quasi-synoptic hydrographic data collected during the Brazilian DOVETAIL 2000 and 2001 austral summer cruises. The analysis is focused on the variations of the deep Weddell Sea outflow into the Scotia Sea within boxes that bound the main deep gaps over the South Scotia Ridge. To determine the geostrophic volume transports in each box, mass, salt, and heat are conserved within neutral density layers that are not in contact with the atmosphere. Implementing the inverse model and using property anomaly equations weighted by the flow estimate uncertainty our results are consistent with those reported in the literature. A bottom triangle extrapolation method is introduced, which improves the estimated property fluxes through hydrographic sections. In the austral summer of 2000 the transports of Weddell Sea Deep Water (WSDW) through the Philip Passage, Orkney Passage, and southwestern Bruce Passage are 0.01±0.01, 1.15±0.33, and 1.03±0.23 Sv (1 Sv=106 m3 s-1, >0 is northward), respectively. After extrapolation within bottom triangles these transports increase to 0.12±0.03, 3.48±1.81, and 1.20±2.16 Sv. Analysis of the hydrographic data reveal distinct oceanographic conditions over the Philip Passage region, with evidence of mesoscale meanders, warmer and saltier Warm Deep Water (WDW) and colder WSDW observed in 2001 than in 2000. Despite these differences the WSDW transport does not present a significant variation between 2000 and 2001. The WSDW transports through the Philip Passage in 2001 are 0.012±0.001 and 0.113±0.001 Sv after extrapolation within bottom triangles. The circulation derived from the inversion in the austral summer of 2001 suggests a sharp weakening of the barotropic cyclonic flow in the Powell Basin, which may be due to northerly and northeasterly winds associated with an atmospheric low-pressure center located west of the Antarctic Peninsula. We suggest that similar variations in atmospheric forcing may explain changes in the intensity of the cyclonic flow observed in the northwestern Weddell Sea and Powell Basin. © 2007 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Northwestern Weddell Sea deep outflow into the Scotia Sea during the austral summers of 2000 and 2001 estimated by inverse methods
Autor:Franco, B.C.; Mata, M.M.; Piola, A.R.; Garcia, C.A.E.
Filiación:Departamento de Física, Fundação Universidade Federal do Rio Grande, Caixa Postal 474, 96201-900 Rio Grande, RS, Brazil
Departamento Oceanografía, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, C1270ABV Buenos Aires, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Deep outflow variations; DOVETAIL; Inverse methods; Northwestern weddell sea; Weddell sea deep water; Data acquisition; Global warming; Water; Deep outflow variations; Inverse methods; Northwestern weddell; Oceanography; atmospheric forcing; deep water; estimation method; flux measurement; geostrophic flow; heat budget; ocean basin; outflow; summer; warm water; Antarctic Peninsula; Antarctica; Atlantic Ocean; Philip Passage; Powell Basin; Scotia Ridge; Scotia Sea; Southern Ocean; Weddell Sea; West Antarctica
Año:2007
Volumen:54
Número:10
Página de inicio:1815
Página de fin:1840
DOI: http://dx.doi.org/10.1016/j.dsr.2007.06.003
Título revista:Deep-Sea Research Part I: Oceanographic Research Papers
Título revista abreviado:Deep-Sea Res. Part I Oceanogr. Res. Pap.
ISSN:09670637
CODEN:DRORE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v54_n10_p1815_Franco

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Citas:

---------- APA ----------
Franco, B.C., Mata, M.M., Piola, A.R. & Garcia, C.A.E. (2007) . Northwestern Weddell Sea deep outflow into the Scotia Sea during the austral summers of 2000 and 2001 estimated by inverse methods. Deep-Sea Research Part I: Oceanographic Research Papers, 54(10), 1815-1840.
http://dx.doi.org/10.1016/j.dsr.2007.06.003
---------- CHICAGO ----------
Franco, B.C., Mata, M.M., Piola, A.R., Garcia, C.A.E. "Northwestern Weddell Sea deep outflow into the Scotia Sea during the austral summers of 2000 and 2001 estimated by inverse methods" . Deep-Sea Research Part I: Oceanographic Research Papers 54, no. 10 (2007) : 1815-1840.
http://dx.doi.org/10.1016/j.dsr.2007.06.003
---------- MLA ----------
Franco, B.C., Mata, M.M., Piola, A.R., Garcia, C.A.E. "Northwestern Weddell Sea deep outflow into the Scotia Sea during the austral summers of 2000 and 2001 estimated by inverse methods" . Deep-Sea Research Part I: Oceanographic Research Papers, vol. 54, no. 10, 2007, pp. 1815-1840.
http://dx.doi.org/10.1016/j.dsr.2007.06.003
---------- VANCOUVER ----------
Franco, B.C., Mata, M.M., Piola, A.R., Garcia, C.A.E. Northwestern Weddell Sea deep outflow into the Scotia Sea during the austral summers of 2000 and 2001 estimated by inverse methods. Deep-Sea Res. Part I Oceanogr. Res. Pap. 2007;54(10):1815-1840.
http://dx.doi.org/10.1016/j.dsr.2007.06.003