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Abstract:

Nutrient distributions observed at some depths along the continental shelf from 27°05′S (Brazil) to 39°31′S (Argentina) in winter, 2003 and summer, 2004 related to salinity and dissolved oxygen (mL L-1) and saturation (%) data showed remarkable influences of fresh water discharge over the coastal region and in front of the La Plata estuary. In the southern portion of the study area different processes were verified. Upwelling processes caused by ocean dynamics typical of shelf break areas, eddies related to surface dynamics and regeneration processes confirmed by the increase of nutrients and the decrease of dissolved and saturation oxygen data were verified. High silicate concentrations in the surface waters were identified related to low salinities (minimum of 21.22 in winter and 21.96 in summer), confirming the importance of freshwater inputs in this region, especially in winter. Silicate concentration range showed values between 0.00 and 83.52 μM during winter and from 0.00 to 41.16 μM during summer. Phosphate concentrations worked as a secondary trace of terrestrial input and their values varied from 0.00 to 3.30 μM in winter and from 0.03 to 2.26 μM in summer; however, in shallow waters, phosphate indicated more clearly the fresh water influence. The most important information given by nitrate concentrations was the presence of water from SACW upwelling that represents a new source of nutrients for marine primary production. Nitrate maximum values reached 41.96 μM in winter and 33.10 μM in summer. At a depth ∼800 m, high nitrate, phosphate and silicate concentrations were related to Malvinas Current Waters, Subantarctic Shallow Waters and Antarctic Atlantic Intermediate Waters (AAIW). Dissolved oxygen varied from 3.41 to 7.06 mL L-1 in winter and from 2.65 to 6.85 mL L-1 in summer. The percentage of dissolved oxygen saturation in the waters showed values between 48% and 113% in winter and from 46% to135% in summer. The most important primary production was verified in the summer, and situations of undersaturation were mainly observed below 50 m depth and at some points near the coast. The anti-correlation between nutrients and dissolved oxygen which showed evident undersaturation also revealed important potential sites of remineralization processes. The nutrient behaviours showed some aspects of the processes that occur over the Southwestern South Atlantic continental shelf and in their land-sea interfaces between Mar del Plata and Itajaí. © 2008 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects
Autor:Braga, E.S.; Chiozzini, V.C.; Berbel, G.; Maluf, J.; Aguiar, V.; Charo, M.; Molina, D.; Romero, S; Eichler, B.B.
Filiación:Laboratório de Nutrientes, micronutrientes e traços nos oceanos, Instituto Oceanográfico, Universidade de São Paulo, Praca do Oceanográfico, 191, São Paulo, Brazil
Servicio de Hidrografia Naval, Buenos Aires, Argentina
Departamento de Ciencias de la Atmósfera y Océanos, FCEN, Univeridad de Buenos Aires, Argentina
Instituto Oceanográfico, Universidade de São Paulo, Praca do Oceanográfico, 191, São Paulo, Brazil
Palabras clave:Mar del Plata; Nutrient distributions; Remineralization processes; South Atlantic Ocean; Terrestrial inputs; Upwelling; Antarctic Intermediate Water; continental shelf; dissolved oxygen; land-sea interaction; nutrient; phosphate; primary production; remineralization; salinity; shallow water; shelf break; silicate; summer; winter; Argentina; Atlantic Ocean; Atlantic Ocean (South); Brazil; Buenos Aires [Argentina]; Itajai-Acu Estuary; Mar del Plata; Rio de la Plata; Santa Catarina; South America
Año:2008
Volumen:28
Número:13
Página de inicio:1649
Página de fin:1661
DOI: http://dx.doi.org/10.1016/j.csr.2007.06.018
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_v28_n13_p1649_Braga

Referencias:

  • Borús, J., Uriburu-Quirno, M., Calvo, D., 2006. Evaluación de caudales diarios descargados por grandes ríos del sistema del Plata al estuario del Río de la Plata. Alerta Hidrológico-Instituto Nacional del Agua y el Ambiente, Ezeiza, Argentina; Braga, E.S., Müller, T., Observation of regeneration of nitrate, phosphate and silicate during upwelling off Ubatuba, Brazil (1998) Continental Shelf Research, 18 (8), pp. 915-922
  • Braga, E.S., Niencheski, L.F.H., Composição das massas de água e seus potenciais produtivos na área entre o Cabo de São Tomé (RJ) e o Chuí (RS) (2006) O ambiente Oceanográfico da Plataforma Continental e do talude na Região Sudeste-Sul do Brasil, pp. 161-218. , Rossi-Wongtschowiski C.L.D., and Madureira L.S.P. (Eds), Edusp, São Paulo
  • Castello, J.P., Möller, O.O., On the oceanographic conditions off Rio Grande do Sul (1977) Atlântica, 2 (2), pp. 25-110
  • Depetris, P.J., Paolini, J.E., Biogeochemical aspect of South American rivers: the Paraná and the Orinoco (1991) Biogeochemistry of the Major World Rivers, Scope 42, pp. 105-125. , Degens E.T., Kempe S., and Richey J.R. (Eds), Wiley, New York
  • Grasshoff, K., Ehrhardt, M., Kremling, K., (1983) Methods of Seawater Analysis. second ed., , Verlag Chemie, Weinheim p. 419
  • Hensen, C., Zabel, M., Schulz, H.D., A comparison of benthic nutrient fluxes from deep-sea sediments off Namibia and Argentina (2000) Deep-Sea Research II, 47, pp. 2029-2050
  • Mamaev, O., 1970. Análisis de las aguas del Oceano Mundial. M. Gidromestisdat. In: Severov, D.N., 1991; Matsuura, Y., Contribuição ao estudo da estrutura oceanográfica da região sudeste entre cabo frio (RJ) e cabo de santa marta grande (SC) (1986) Ciência e Cultura, 38 (8), pp. 1439-1450
  • Piola, A., Möller, O.O., Palma, E.D., El impacto del Plata sobre el océano Atlántico (2004) Ciencias Hoy, 14 (82), pp. 29-37
  • Piola, A.R., Matano, R.P., Palma, E.D., Möller, O.O., Campos, E.J.D., The influence of the Plata River discharge on the western South Atlantic shelf (2005) Geophysical Research Letters, 32, pp. L01603. , 10.1029/2004GL021638
  • Podestá, G.P., Utilización de datos satelitarios en investigaciones oceanográficas y pesqueras en el Océano Atlántico Sudoccidental (1997) El Mar Argewntino y sus Recursos Pequeros, 1, pp. 195-222. , Boschi E. (Ed), Inst. Nac. Del Investigación y Desarrollo Pesquero, Mar de Plata, Argentina
  • Provost, C., Garçon, V., Falcon, L.M., Hydrographic conditions in the surface layers over the slope-open ocean transition area near the Brazil-Malvinas confluence during austral summer 1990 (1996) Continental Shelf Research, 16 (2), pp. 215-235
  • Romero, S.I., Piola, A.R., Charo, M., Garcia, C.A.E., Seasonal to interannual variability along the Patagonia shelf and shelf-break based on satellite ocean color data (2006) Journal of Geophysical Research, 111, pp. C05021. , 10.1029/2005JC003244
  • Saraceno, M., Provost, C., Piola, A.R., On the relationship between satellite retrieved surface temperature fronts and chlorophyll-a in the Western South Atlantic (2005) Journal of Geophysical Research, 110, pp. C11016. , 10.1029/2004JC002736
  • Strickland, J.D., Parsons, T.R., 1968. A Practical Handbook of Seawater Analyses. Bulletin Fishery Research Bd., Canada, p. 293

Citas:

---------- APA ----------
Braga, E.S., Chiozzini, V.C., Berbel, G., Maluf, J., Aguiar, V., Charo, M., Molina, D.,..., Eichler, B.B. (2008) . Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects. Continental Shelf Research, 28(13), 1649-1661.
http://dx.doi.org/10.1016/j.csr.2007.06.018
---------- CHICAGO ----------
Braga, E.S., Chiozzini, V.C., Berbel, G., Maluf, J., Aguiar, V., Charo, M., et al. "Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects" . Continental Shelf Research 28, no. 13 (2008) : 1649-1661.
http://dx.doi.org/10.1016/j.csr.2007.06.018
---------- MLA ----------
Braga, E.S., Chiozzini, V.C., Berbel, G., Maluf, J., Aguiar, V., Charo, M., et al. "Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects" . Continental Shelf Research, vol. 28, no. 13, 2008, pp. 1649-1661.
http://dx.doi.org/10.1016/j.csr.2007.06.018
---------- VANCOUVER ----------
Braga, E.S., Chiozzini, V.C., Berbel, G., Maluf, J., Aguiar, V., Charo, M., et al. Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects. Cont. Shelf Res. 2008;28(13):1649-1661.
http://dx.doi.org/10.1016/j.csr.2007.06.018