Annual variability of sea surface temperature in the northern argentinean continental shelf

Moira Luz Clara; Claudia G.  Simionato; Andrés J.  Jaureguizar

Authors

Moira Luz Clara Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP). Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS).
Claudia G. Simionato Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS). Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA). Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA).
Andrés J. Jaureguizar Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC). Instituto Argentino de Oceanografía. Universidad Provincial del Sudoeste (UPSO)-subsede Coronel Pringles.

Keywords:

SST seasonal cycle, EOF analysis, water regime areas, Southwestern Atlantic Ocean

Abstract

Twelve years of daily satellite data (0.1° spatial resolution) were used to study the seasonal variability of the sea surface temperature (SST) over the Northern Argentinean Continental Shelf (NACS; between 33°- 45° S and 52°- 66° W). The seasonal cycle, which includes the annual and semi-annual signals, was assessed using harmonic analysis. The annual cycle explained more than 90% of the total variance in the NACS, with SST amplitudes varying from 3.4 to 7.6° C. Largest variances values for this timescale were observed along the Argentinean coast and the inner shelf; particularly in the El Rincón region (exceeding 96%). Empirical Orthogonal Function Analysis (EOF) in S-Mode was applied to daily SST anomalies in the annual timescale, indicating that nearly 94% of its variance was explained by the first two modes, which accounted for 70 and 24% of the variance, respectively. Mode 1 prevailed most of the year with its positive phase occurring in autumn/winter and the negative in spring/summer.
This mode revealed the seasonal radiative warming/cooling, related to the heating/cooling in summer/winter in most of the NACS; the shallow waters of the Río de la Plata and El Rincón were heated and cooled more and faster than deeper waters. The weakest seasonal heating/cooling occurred around Península Valdés, where vertical mixing maximizes due to tidal action. Mode 2 corresponded to early spring and early fall in their positive and negative phases, respectively. This mode was related to a transition during the early intermediate seasons when the cooling/heating of an extended coastal region connecting Península Valdés and the Río de la Plata occur.

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Author Biographies

Moira Luz Clara, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP). Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS).

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Moreno 3527 piso 3,
B7600GIA, Mar del Plata, Buenos Aires, Argentina.
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo
Nº 1, Escollera Norte, B7602HSA, Mar del Plata, Buenos Aires, Argentina.
Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS),
Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, piso 2, C1428EGA, Ciudad
Autónoma de Buenos Aires, Argentina.

Claudia G. Simionato, Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS). Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA). Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA).

Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI/CNRS), Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, piso 2, C1428EGA, Ciudad Autónoma de Buenos Aires, Argentina.
Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA) and Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA), Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, piso 2, C1428EGA, Ciudad Autónoma de Buenos Aires, Argentina.

Andrés J. Jaureguizar, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC). Instituto Argentino de Oceanografía. Universidad Provincial del Sudoeste (UPSO)-subsede Coronel Pringles.

Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC), Calle 526 e/10 y 11, CP1900, La Plata, Buenos Aires, Argentina.
Instituto Argentino de Oceanografía, CC 804, Florida 8000 (Camino La Carrindanga km 7,5), Bahía Blanca, Buenos Aires, Argentina
Universidad Provincial del Sudoeste (UPSO)-subsede Coronel Pringles, Sáenz Peña 867, Coronel Pringles CP 7530, Buenos Aires, Argentina

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