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Abstract:

We study the annual patterns and linear trend of satellite sea level anomaly (SLA) over the southwest South Atlantic continental shelf (SWACS) between 54S and 36S. Results show that south of 42°S the thermal steric effect explains nearly 100% of the annual amplitude of the SLA, while north of 42°S it explains less than 60%. This difference is due to the halosteric contribution. The annual wind variability plays a minor role over the whole continental shelf. The temporal linear trend in SLA ranges between 1 and 5 mm/yr (95% confidence level). The largest linear trends are found north of 39°S, at 42°S and at 50°S. We propose that in the northern region the large positive linear trends are associated with local changes in the density field caused by advective effects in response to a southward displacement of the South Atlantic High. The causes of the relative large SLA trends in two southern coastal regions are discussed as a function meridional wind stress and river discharge. Finally, we combined the annual cycle of SLA with the mean dynamic topography to estimate the absolute geostrophic velocities. This approach provides the first comprehensive description of the seasonal component of SWACS circulation based on satellite observations. The general circulation of the SWACS is northeastward with stronger/weaker geostrophic currents in austral summer/winter. At all latitudes, geostrophic velocities are larger (up to 20 cm/s) close to the shelf-break and decrease toward the coast. This spatio-temporal pattern is more intense north of 45°S. © 2016. American Geophysical Union. All Rights Reserved.

Registro:

Documento: Artículo
Título:Sea level anomaly on the Patagonian continental shelf: Trends, annual patterns and geostrophic flows
Autor:Ruiz Etcheverry, L.A.; Saraceno, M.; Piola, A.R.; Strub, P.T.
Filiación:Departamento de Ciencias de la Atmósfera y Los Océanos, Universidad de Buenos Aires, Buenos Aires, Argentina
Centro de Investigación Del Mar y la Atmósfera, Buenos Aires, Argentina
Instituto Franco Argentino para El Estudio Del Clima y Sus Impactos (UMI-IFAECI), Argentina
International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI, United States
Departamento Oceanografía, Servicio de Hidrografía Naval, Buenos Aires, Argentina
College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Palabras clave:annual cycle; continental shelf; sea level anomaly; amplitude; annual cycle; continental shelf; flow velocity; geostrophic flow; meridional circulation; river discharge; satellite imagery; sea level change; spatiotemporal analysis; trend analysis; wind stress; Atlantic Ocean; Atlantic Ocean (South); Patagonian Shelf
Año:2016
Volumen:121
Número:4
Página de inicio:2733
Página de fin:2754
DOI: http://dx.doi.org/10.1002/2015JC011265
Título revista:Journal of Geophysical Research: Oceans
Título revista abreviado:J. Geophys. Res. Oceans
ISSN:21699275
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v121_n4_p2733_RuizEtcheverry

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Citas:

---------- APA ----------
Ruiz Etcheverry, L.A., Saraceno, M., Piola, A.R. & Strub, P.T. (2016) . Sea level anomaly on the Patagonian continental shelf: Trends, annual patterns and geostrophic flows. Journal of Geophysical Research: Oceans, 121(4), 2733-2754.
http://dx.doi.org/10.1002/2015JC011265
---------- CHICAGO ----------
Ruiz Etcheverry, L.A., Saraceno, M., Piola, A.R., Strub, P.T. "Sea level anomaly on the Patagonian continental shelf: Trends, annual patterns and geostrophic flows" . Journal of Geophysical Research: Oceans 121, no. 4 (2016) : 2733-2754.
http://dx.doi.org/10.1002/2015JC011265
---------- MLA ----------
Ruiz Etcheverry, L.A., Saraceno, M., Piola, A.R., Strub, P.T. "Sea level anomaly on the Patagonian continental shelf: Trends, annual patterns and geostrophic flows" . Journal of Geophysical Research: Oceans, vol. 121, no. 4, 2016, pp. 2733-2754.
http://dx.doi.org/10.1002/2015JC011265
---------- VANCOUVER ----------
Ruiz Etcheverry, L.A., Saraceno, M., Piola, A.R., Strub, P.T. Sea level anomaly on the Patagonian continental shelf: Trends, annual patterns and geostrophic flows. J. Geophys. Res. Oceans. 2016;121(4):2733-2754.
http://dx.doi.org/10.1002/2015JC011265