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Abstract:

Previous works show that wind forcing is the main source of circulation seasonal variability in the Río de la Plata estuary, located on the southeastern coast of South America. Wind forcing exceeds by far the role of fresh water discharges. However, due to a lack of enough observations, the features and causes of surface wind variability are not well understood yet. Therefore this paper presents a comprehensive study of surface wind variability over the Río de la Plata estuary using the National Center for Environmental Prediction-National Center for Atmospheric Research (NCEP/NCAR) reanalysis data between 1948 and 1997. It is expected that this study contributes to better understand, model and thus predict the estuary circulation. An onshore to offshore rotation characterizes the seasonal variations of the surface winds from summer to winter. A linear trend analysis shows a displacement of the summer-winter seasonal features to earlier months. On interannual time-scales, the first leading pattern describes east-west changes of surface winds that seems to be forced by the quasibiennial tropospheric oscillation excited in the western tropical Pacific and previously identified by many authors. The conditions over the South Atlantic and in particular the Río de la Plata are influenced by such oscillation through an atmospheric Rossby wave train propagating out of the tropics. This result is very important for its implication on the predictability levels in the region. The second leading mode is associated with anticyclonic/cyclonic wind rotations off the estuary on interannual times scales which are related with changes in both atmospheric and oceanic surface conditions at Southern Hemispher high-latitudes.

Registro:

Documento: Artículo
Título:Surface wind variability on seasonal and interannual scales over RíO de la Plata area
Autor:Simionato, C.G.; Vera, C.S.; Siegismund, F.
Filiación:Centro de Investigaciones del Mar Y la Atmósfera (CIMA/CONICET-UBA), Departamento de Ciencias de la Atmósfera Y Los Océanos FCEN, University of Buenos Aires, Argentina
Zentrum für Meeres - und Klimaforschung (ZMK), Hamburg University, Germany
Palabras clave:41-30° S; 58-47° W; Estuaries; Interannual variability; Northern Argentine Continental Shelf; Río de la Plata; Seasonality; Wind variability; temporal variation; wind; Rio de la Plata; South America; Western Hemisphere; World
Año:2005
Volumen:21
Número:4
Página de inicio:770
Página de fin:783
DOI: http://dx.doi.org/10.2112/008-NIS.1
Título revista:Journal of Coastal Research
Título revista abreviado:J. Coast. Res.
ISSN:07490208
CODEN:JCRSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v21_n4_p770_Simionato

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Citas:

---------- APA ----------
Simionato, C.G., Vera, C.S. & Siegismund, F. (2005) . Surface wind variability on seasonal and interannual scales over RíO de la Plata area. Journal of Coastal Research, 21(4), 770-783.
http://dx.doi.org/10.2112/008-NIS.1
---------- CHICAGO ----------
Simionato, C.G., Vera, C.S., Siegismund, F. "Surface wind variability on seasonal and interannual scales over RíO de la Plata area" . Journal of Coastal Research 21, no. 4 (2005) : 770-783.
http://dx.doi.org/10.2112/008-NIS.1
---------- MLA ----------
Simionato, C.G., Vera, C.S., Siegismund, F. "Surface wind variability on seasonal and interannual scales over RíO de la Plata area" . Journal of Coastal Research, vol. 21, no. 4, 2005, pp. 770-783.
http://dx.doi.org/10.2112/008-NIS.1
---------- VANCOUVER ----------
Simionato, C.G., Vera, C.S., Siegismund, F. Surface wind variability on seasonal and interannual scales over RíO de la Plata area. J. Coast. Res. 2005;21(4):770-783.
http://dx.doi.org/10.2112/008-NIS.1