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Abstract:

The Drake Passage (DP) links the Southern Pacific and Atlantic Oceans, and acts as a physical narrowing for the largest current of the World Ocean, the Antarctic Circumpolar Current (ACC). This result in a constriction of the main circumpolar fronts related to the ACC: the Subantarctic Front, the Polar Front, the Southern Antarctic Circumpolar Current Front and the Continental Water Boundary Front. Previous studies showed that the DP is a high-nutrient low-chlorophyll (HNLC) region, but studies on the interannual and seasonal macronutrients’ fluctuations in relation with chlorophyll and frontal areas in the DP are scarce. This study analyzes the spatial and temporal trends of nitrate, phosphate, and silicate on surface samples from 113 oceanographic stations in the DP during summer and early fall of 2001 to 2004, in relation with the different fronts and chlorophyll-a concentration. The results revealed an increase of nutrients towards the south. Nitrate showed values from 3 μM at 55° S to 27 μM at 63° S, whereas values from 0.3 μM at 55° S to 2.6 μM at 63° S were observed for phosphate. Silicate increased considerably south of Polar Front, from 0 μM at 55° S to 74 μM at 62° S. The nutrients concentration was significantly higher in summer than in early fall and showed a trend to decrease over the studied years. A complex sum of biogeochemical processes would generate the main seasonal trends, while atmospheric-oceanic processes such as Southern Annular Mode and El Niño Southern Oscillation, would be responsible of observed nutrients interannual variability. © 2016, Asociacion Argentina de Ecologia. All rights reserved.

Registro:

Documento: Artículo
Título:Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage
Autor:Paparazzo, F.E.; Alder, V.A.; Schloss, I.R.; Bianchi, A.; Esteves, J.L.
Filiación:Centro Nacional Patagónico, CENPAT-CONICET, Puerto Madryn, Chubut, Argentina
Instituto Antártico Argentino, Ciudad Autónoma de Buenos Aires, Argentina
Departamento de Ecología, Genética y Evolución, IEGEBA-CONICET. Facultad de Ciencias Exactas y Naturales (UBA). Ciudad Autónoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET. Ciudad Autónoma de Buenos Aires, Argentina
Institut des sciences de la mer de Rimouski, ISMER. Université du Québec à Rimouski, Rimouski, QC, Canada
Departamento Oceanografía, Servicio de Hidrografía Naval, Ciudad Autónoma de Buenos Aires, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales (UBA). Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:Antarctic fronts; Antarctic zones; Chlorophyll-a; Interannual variation; Nitrate; Phosphate; Salinity; Seasonal variation; Silicate; Temperature; annual variation; atmosphere-ocean system; biogeochemistry; chlorophyll a; concentration (composition); El Nino-Southern Oscillation; nitrate; nutrient dynamics; phosphate; polar front; salinity; seasonal variation; silicate; temperature effect; Antarctic Circumpolar Current; Atlantic Ocean; Drake Passage; Pacific Ocean; Pacific Ocean (South); Southern Ocean
Año:2016
Volumen:26
Número:1
Página de inicio:27
Página de fin:39
Título revista:Ecologia Austral
Título revista abreviado:Ecol. Austral
ISSN:03275477
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v26_n1_p27_Paparazzo

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Citas:

---------- APA ----------
Paparazzo, F.E., Alder, V.A., Schloss, I.R., Bianchi, A. & Esteves, J.L. (2016) . Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage . Ecologia Austral, 26(1), 27-39.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v26_n1_p27_Paparazzo [ ]
---------- CHICAGO ----------
Paparazzo, F.E., Alder, V.A., Schloss, I.R., Bianchi, A., Esteves, J.L. "Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage " . Ecologia Austral 26, no. 1 (2016) : 27-39.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v26_n1_p27_Paparazzo [ ]
---------- MLA ----------
Paparazzo, F.E., Alder, V.A., Schloss, I.R., Bianchi, A., Esteves, J.L. "Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage " . Ecologia Austral, vol. 26, no. 1, 2016, pp. 27-39.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v26_n1_p27_Paparazzo [ ]
---------- VANCOUVER ----------
Paparazzo, F.E., Alder, V.A., Schloss, I.R., Bianchi, A., Esteves, J.L. Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage . Ecol. Austral. 2016;26(1):27-39.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v26_n1_p27_Paparazzo [ ]