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A long term simulation of the barotropic circulation in the Río de la Plata estuary was performed with the aim of identifying the characteristic patterns of sea surface height (SSH) variability from synoptic to inter-annual time scales and their forcing mechanisms. Hamburg Shelf Ocean Model (HamSOM), forced by tides, monthly mean runoffs and 4-daily 10 m winds and surface atmospheric pressure from the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis was run. The solution was analyzed for the period 1965-2004. Inter-annual variability accounts for almost 10% of the variance. The first EOF mode of SSH variability on this time scale is associated with a mean anomaly of approximately 0.25 m at the upper estuary forced by both runoff and winds, which seems to be strongly associated with the ENSO cycles. Other two modes, with periodicities around 2.5 and 10 years were also found. Even though they are linked to weaker SSH anomalies, they are consistent with inter-annual modes of wind variability reported by other authors. Those modes are important, particularly if they act in phase, because they can provide a background for stronger surges. In contrast with the salinity field, SSH variability on seasonal time scales accounts for a very small percentage of variance and it is the combination of an annual and a semi-annual signal forced by winds and runoff, respectively. Approximately 90% of the variance is due to wind driven variability on sub-annual time scales. The most significant SSH anomalies in this band are associated with cyclogenetic events in the atmosphere, occurring either over Uruguay or over the Patagonian Shelf, whereas the strengthening or weakening of the semi-permanent South Atlantic anticyclone displays a relatively smaller influence. In agreement with previous publications, the estuary's spatial patterns in response to short-scale wind variability seem to be determined by wind direction more than by wind speed. © 2009 Elsevier Ltd. All rights reserved.


Documento: Artículo
Título:Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
Autor:Meccia, V.L.; Simionato, C.G.; Fiore, M.E.; D'Onofrio, E.E.; Dragani, W.C.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA), Ciudad Universitaria, Pabellon II Piso 2, C1428EHA Ciudad Autonoma de Buenos Aires, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon II Piso 2, C1428EHA Ciudad Autonoma de Buenos Aires, Argentina
Departamento de Oceanografía, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, C1270ABV Ciudad Autonoma de Buenos Aires, Argentina
Instituto de Geodesia y Geofísica Aplicadas, Facultad de Ingeniería, Universidad de Buenos Aires, Av. Las Heras 2214, C1127AAR Ciudad Autonoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avda. Rivadavia 1917, C1033AAJ Ciudad Autonoma de Buenos Aires, Argentina
Palabras clave:annual variation; atmospheric forcing; atmospheric pressure; barotropic motion; cyclogenesis; El Nino-Southern Oscillation; numerical model; runoff; sea surface height; storm surge; variance analysis; wind direction; wind velocity; Rio de la Plata; South America
Página de inicio:327
Página de fin:343
Título revista:Estuarine, Coastal and Shelf Science
Título revista abreviado:Estuar. Coast. Shelf Sci.


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---------- APA ----------
Meccia, V.L., Simionato, C.G., Fiore, M.E., D'Onofrio, E.E. & Dragani, W.C. (2009) . Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations. Estuarine, Coastal and Shelf Science, 85(2), 327-343.
---------- CHICAGO ----------
Meccia, V.L., Simionato, C.G., Fiore, M.E., D'Onofrio, E.E., Dragani, W.C. "Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations" . Estuarine, Coastal and Shelf Science 85, no. 2 (2009) : 327-343.
---------- MLA ----------
Meccia, V.L., Simionato, C.G., Fiore, M.E., D'Onofrio, E.E., Dragani, W.C. "Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations" . Estuarine, Coastal and Shelf Science, vol. 85, no. 2, 2009, pp. 327-343.
---------- VANCOUVER ----------
Meccia, V.L., Simionato, C.G., Fiore, M.E., D'Onofrio, E.E., Dragani, W.C. Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations. Estuar. Coast. Shelf Sci. 2009;85(2):327-343.