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Abstract:

The Zapiola Rise (ZR) is a singular sedimentary deposit about 1200 m in height and 1500 km in width located in the Argentine Basin. In situ and satellite observations have revealed the presence of an intense counterclockwise circulation around the feature, with a volume transport comparable to those of the major ocean currents. The existence of a very low-frequency variability of the transport associated with the anticyclonic circulation is documented for the first time. As the Zapiola anticyclonic circulation plays a significant role in the mixing of the strongly contrasted water masses of the South Atlantic, variations in the anticyclonic transport can have a major impact on the mixing, hence a role in global climate variability. The circulation was clearly anticyclonic in the periods 1993-1999 and 2002-2007. In contrast, the 1999-2001 period did not show evidence of an anticyclonic flow in the mean surface velocity field. Moreover, the analysis of the weekly fields during that period of time revealed a cyclonic pattern from time to time. Previous work has shown that the flow can be considered as purely barotropic over the ZR region. A 15-year time-series of the transport was produced using absolute altimeter-derived geostrophic velocities. The estimated transport presents high-frequency variability associated with mesoscale activity superimposed on a low-frequency signal. The amplitude of the estimated transport is in good agreement with the only in situ-derived estimation available (80 Sv, January 1993). The low-frequency signal presents a minimum during the period 1999-2001, further suggesting that at times the Zapiola anticyclonic flow may have significantly decreased in strength or even vanished. Possible causes of the low-frequency variability are discussed. © 2009 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses
Autor:Saraceno, M.; Provost, C.; Zajaczkovski, U.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA), Intendente Güiraldes 2160, Ciudad de Buenos Aires C1428EGA, Argentina
Departamento de la Atmósfera y los Océanos, FCEyN, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad de Buenos Aires C1428EGA, Argentina
Laboratoire d' Oceanographie et du Climat: Experimentation et Approche Numérique (LOCEAN), Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris cedex 05, France
Departamento de Oceanografía, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, Ciudad de Buenos Aires, C1270ABV, Argentina
Palabras clave:Interannual variability; South Atlantic circulation; Zapiola Rise; Anticyclonic circulation; Anticyclonic flow; Barotropic; Global climates; High frequency HF; In-situ; Interannual variability; Long-term variations; Low frequency variability; Low-frequency signals; Mesoscale activity; Ocean circulation; Satellite altimetry; Satellite observations; Sedimentary deposits; South Atlantic; South Atlantic circulation; Surface velocity; Volume transport; Water mass; Zapiola Rise; Climatology; Ocean engineering; Ocean currents; annual variation; anticyclone; climate variation; mass transport; mixing; oceanic circulation; satellite altimetry; time series; water mass; Argentine Basin; Atlantic Ocean; Zapiola Rise
Año:2009
Volumen:56
Número:7
Página de inicio:1077
Página de fin:1092
DOI: http://dx.doi.org/10.1016/j.dsr.2009.03.005
Título revista:Deep-Sea Research Part I: Oceanographic Research Papers
Título revista abreviado:Deep-Sea Res. Part I Oceanogr. Res. Pap.
ISSN:09670637
CODEN:DRORE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v56_n7_p1077_Saraceno

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Citas:

---------- APA ----------
Saraceno, M., Provost, C. & Zajaczkovski, U. (2009) . Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses. Deep-Sea Research Part I: Oceanographic Research Papers, 56(7), 1077-1092.
http://dx.doi.org/10.1016/j.dsr.2009.03.005
---------- CHICAGO ----------
Saraceno, M., Provost, C., Zajaczkovski, U. "Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses" . Deep-Sea Research Part I: Oceanographic Research Papers 56, no. 7 (2009) : 1077-1092.
http://dx.doi.org/10.1016/j.dsr.2009.03.005
---------- MLA ----------
Saraceno, M., Provost, C., Zajaczkovski, U. "Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses" . Deep-Sea Research Part I: Oceanographic Research Papers, vol. 56, no. 7, 2009, pp. 1077-1092.
http://dx.doi.org/10.1016/j.dsr.2009.03.005
---------- VANCOUVER ----------
Saraceno, M., Provost, C., Zajaczkovski, U. Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses. Deep-Sea Res. Part I Oceanogr. Res. Pap. 2009;56(7):1077-1092.
http://dx.doi.org/10.1016/j.dsr.2009.03.005