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Abstract:

SST variability on seasonal to sub-annual scales in the coastal region of South America between 30° and 39°S, largely influenced by the Rio de la Plata estuary's plume, and its relation to wind variability are explored. Data are six years of daily ensembles of gridded satellite SST and sea surface winds with spatial resolutions of about 11 and 25. km, respectively. Observations from oceanographic cruises are used to validate the results. It is found that the seasonal cycle can be explained in terms of two modes. The first one, characterizing fall-early winter/spring-early summer, is related to the radiative cycle. The second one, corresponding to late summer and winter, displays warm/cold anomalies along the Uruguayan coast forced by the prevailing winds during those seasons. In the upper estuary and the northern part of the area of influence of the freshwater plume, variability in sub-annual scales is significant. A large portion of this variance is related to zonal wind anomalies that force warm/cold SSTs along that coast. Cold anomalies of up to -5 °C occur under anomalously intense easterly winds, indicating upwelling. These events are very frequent and show large persistence, occurring up to one and a half months. They also display a marked seasonal cycle - being more frequent in late spring and summer - large inter-annual variability and seem to be modulated by the continental runoff. When discharge is low, the freshwater plume retracts to the west, reducing the inner-shelf stratification and increasing the likelihood of a full upwelling to the surface. In winter, short time-scale SST variability is mostly due to variability in the atmospheric cold fronts crossing the region. Weaker or less frequent (stronger or more frequent) fronts produce a generalized warming (cooling) over the region. As the estuary heats (colds) faster than the shelf, a warm (cold) anomaly develops in the upper Río de la Plata. On inter-annual time scales, probably because ENSO activity was weak during the studied period, SST variability was not important. © 2010 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
Autor:Simionato, C.G.; Clara Tejedor, M.L.; Campetella, C.; Guerrero, R.; Moreira, D.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA), Departamento de Ciencias de la Atmósfera y los Océanos, FCEN, UBA, Ciudad Universitaria Pabellón II Piso 2, C1428EGA Ciudad Autónoma de Buenos Aires, Argentina
Instituto Nacional de Investigación y Desarrollo Pesquero, Universidad Nacional de Mar del Plata, Paseo Victoria Ocampo 1, Escollera Norte, B7602HSA Mar del Plata, Argentina
Palabras clave:Blended SST; Coastal processes; Sea surface interaction; Seasonal cycle; Sub-annual variability; Upwelling; El Nino-Southern Oscillation; freshwater input; runoff; satellite data; sea surface temperature; seasonal variation; spatial resolution; upwelling; wind profile; Rio de la Plata; Uruguay
Año:2010
Volumen:30
Número:19
Página de inicio:1983
Página de fin:1997
DOI: http://dx.doi.org/10.1016/j.csr.2010.09.012
Título revista:Continental Shelf Research
Título revista abreviado:Cont. Shelf Res.
ISSN:02784343
CODEN:CSHRD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02784343_v30_n19_p1983_Simionato

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Citas:

---------- APA ----------
Simionato, C.G., Clara Tejedor, M.L., Campetella, C., Guerrero, R. & Moreira, D. (2010) . Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary. Continental Shelf Research, 30(19), 1983-1997.
http://dx.doi.org/10.1016/j.csr.2010.09.012
---------- CHICAGO ----------
Simionato, C.G., Clara Tejedor, M.L., Campetella, C., Guerrero, R., Moreira, D. "Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary" . Continental Shelf Research 30, no. 19 (2010) : 1983-1997.
http://dx.doi.org/10.1016/j.csr.2010.09.012
---------- MLA ----------
Simionato, C.G., Clara Tejedor, M.L., Campetella, C., Guerrero, R., Moreira, D. "Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary" . Continental Shelf Research, vol. 30, no. 19, 2010, pp. 1983-1997.
http://dx.doi.org/10.1016/j.csr.2010.09.012
---------- VANCOUVER ----------
Simionato, C.G., Clara Tejedor, M.L., Campetella, C., Guerrero, R., Moreira, D. Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary. Cont. Shelf Res. 2010;30(19):1983-1997.
http://dx.doi.org/10.1016/j.csr.2010.09.012