Artículo
Artana, C.; Ferrari, R.; Koenig, Z.; Saraceno, M.; Piola, A.R.; Provost, C. "Malvinas Current variability from Argo floats and satellite altimetry" (2016) Journal of Geophysical Research: Oceans. 121(7):4854-4872
Estamos trabajando para incorporar este artículo al repositorio
Consulte la política de Acceso Abierto del editor
Abstract:
The Malvinas Current (MC) is an offshoot of the Antarctic Circumpolar Current (ACC). Downstream of Drake Passage, the northern fronts of the ACC veer northward, cross over the North Scotia Ridge (NSR) and the Malvinas Plateau, and enter the Argentine Basin. We investigate the variations of the MC circulation between the NSR and 41°S and their possible relations with the ACC circulation using data from Argo floats and satellite altimetry. The data depict meandering and eddy shedding of the northern ACC jets as they cross the NSR. The altimetry fields show that these eddies are trapped, break down, and dissipate over the Malvinas Plateau, suggesting that this region is a hot spot for dissipation of mesoscale variability. Variations of sea level anomalies (SLA) across the NSR do not impact the MC further north, except for intra-seasonal variability associated with coastal trapped waves. Altimetry and float trajectories show events during which a large fraction of the MC is cut off from the ACC. Blocking events at around 48.5°S are a recurrent feature of the MC circulation. Over the 23 year altimetry record, we detected 26 events during which the MC surface transport at 48.5°S was reduced to less than half its long-term mean. Blocking events last from 10 to 35 days and do not present any significant trend. These events were tracked back to positive SLA that built up over the Argentine Abyssal Plain. Future work is needed to understand the processes responsible for these blocking events. © 2016. American Geophysical Union. All Rights Reserved.
Registro:
| Documento: | Artículo |
| Título: | Malvinas Current variability from Argo floats and satellite altimetry |
| Autor: | Artana, C.; Ferrari, R.; Koenig, Z.; Saraceno, M.; Piola, A.R.; Provost, C. |
| Filiación: | Laboratoire LOCEAN-IPSL, Sorbonne Universités, UPMC, Univ. Paris 6-CNRS-IRD-MNHN, Paris, France CIMA/CONICET-UBA and UMI IFAECI-3351, Buenos Aires, Argentina CIMA/CONICET-UBA DCAO/FCEN/UBA and UMI-IFAECI 3351, Buenos Aires, Argentina Departamento de Oceanografía, Servicio de Hidrografía Naval, DCAO/FCEN/UBA and UMI-IFAECI 3351, CONICET, Buenos Aires, Argentina |
| Palabras clave: | altimetry; Argo floats; blocking; dissipation; eddies; Malvinas Current; abyssal plain; Antarctic Circumpolar Wave; Argo; atmospheric blocking; energy dissipation; mesoscale eddy; satellite altimetry; sea level change; seasonal variation; trapped wave; Antarctic Circumpolar Current; Argentine Basin; Atlantic Ocean; Drake Passage; Malvinas Current; Scotia Ridge; Southern Ocean |
| Año: | 2016 |
| Volumen: | 121 |
| Número: | 7 |
| Página de inicio: | 4854 |
| Página de fin: | 4872 |
| DOI: | http://dx.doi.org/10.1002/2016JC011889 |
| Título revista: | Journal of Geophysical Research: Oceans |
| Título revista abreviado: | J. Geophys. Res. Oceans |
| ISSN: | 21699275 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v121_n7_p4854_Artana |
Referencias:
- Barré, N., Provost, C., Renault, A., Sennéchael, N., Fronts, meanders and eddies in Drake Passage during the ANT-XXIII/3 cruise in January–February 2006: A satellite perspective (2011) Deep Sea Res., Part II, Topical Studies in Oceanography, 58 (25), pp. 2533-2554
- Chelton, D.B., Schlax, M.G., Witter, D.L., Richman, J.G., Geosat altimeter observations of the surface circulation of the Southern Ocean (1990) J. Geophys. Res., 95, pp. 17,877-17,903
- Fetter, A.F.H., Matano, R.P., On the origins of the variability of the Malvinas Current in a global, eddy-permitting numerical simulation (2008) J. Geophys. Res., 113, p. C11018
- Fu, L.L., Pathways of eddies in the South Atlantic Ocean revealed from satellite altimeter observations (2006) Geophys. Res. Lett., 33, p. L14610
- Garzoli, S.L., Giulivi, C., What forces the variability of the Southwestern Atlantic Boundary Currents? (1994) Deep Sea Res., Part I, 41, pp. 1527-1550
- Gordon, A.L., Brazil Malvinas Confluence-1984 (1989) Deep Sea Res., Part I, 36 (3), pp. 359-384
- Koenig., Z., Provost, C., Park, Y.-H., Ferrari, R., Sennéchael, N., Anatomy of the Antarctic Current volume transport through Drake Passage (2016) J. Geophys. Res. Oceans, 121, pp. 2572-2595
- Nowlin, W.D., Jr., Whitworth, T., III, Pillsbury, R.D., Structure and transport of the Antarctic Circumpolar Current at Drake Passage from short-term measurements (1977) J. Phys. Oceanogr., 7 (6), pp. 788-802
- Orsi, A.H., Whitworth, I.T., Nowlin, J.W., On the meridional extent and fronts of the Antarctic Circumpolar Current (1995) Deep Sea Res., Part I, 42, pp. 641-673
- Piola, A.R., Gordon, A.L., Intermediate Waters in the Southwest South-Atlantic (1989) Deep Sea Res., Part I, 36 (1), pp. 1-16
- Provost, C., Renault, A., Barré, N., Sennéchael, N., Garçon, V., Sudre, J., Huhn, O., Two repeat crossings of Drake Passage in austral summer 2006: Short-term variations and evidence for considerable ventilation of intermediate and deep waters (2011) Deep Sea Res., Part II, 58 (25), pp. 2555-2571
- Saraceno, M., Provost, C., On eddy polarity distribution in the southwestern Atlantic (2012) Deep Sea Res., Part I, 69, pp. 62-69
- Saraceno, M., Provost, C., Piola, A.R., Bava, J., Gagliardini, A., The Brazil Malvinas Frontal System as seen from nine years of AVHRR data (2004) J. Geophys. Res., 109, p. C05027
- Saraceno, M., Provost, C., Zajackovski, U., Long-term variation in the anticyclonic ocean circulation over the Zapiola Rise as observed by satellite altimetry: Evidence of possible collapses (2009) Deep Sea Res., Part I, 56, pp. 1077-1092
- Saunders, P.M., King, B.A., Bottom current derived from a shipborne ADCP on WOCE cruise A11 in the South Atlantic (1995) J. Phys. Oceanogr., 25, pp. 329-347
- Smith, W.H.F., Sandwell, D.T., Bathymetric prediction from dense satellite altimetry and sparse shipboard bathymetry (1994) J. Geophys. Res., 99, pp. 21,803-21,824
- Sokolov, S., Rintoul, S.R., The circumpolar structure and distribution of the Antarctic Circumpolar Current fronts. Part 1: Mean circumpolar paths (2009) J. Geophys. Res., 114, p. C11018
- Sokolov, S., Rintoul, S.R., Circumpolar structure and distribution of the Antarctic Circumpolar Current fronts: 2. Variability and relationship to sea surface height (2009) J. Geophys. Res., 114
- Spadone, A., Provost, C., Variations in the Malvinas Current volume transport since October 1992 (2009) J. Geophys. Res., 114, p. C02002
- Vivier, F., Provost, C., Direct velocity measurements in the Malvinas Current (1999) J. Geophys. Res., 104, pp. 21,083-21,103
- Vivier, F., Provost, C., Volume transport of the Malvinas Current: Can the flow be monitored by TOPEX/Poseidon? (1999) J. Geophys. Res., 104, pp. 21,105-21,122
- Vivier, F., Provost, C., Meredith, M., Remote and local forcing in the Brazil Malvinas Region (2001) J. Phys. Oceanogr., 31, pp. 892-913
- Volkov, D.L., Fu, L.L., The role of vorticity fluxes in the dynamics of the Zapiola Anticyclone (2008) J. Geophys. Res., 113, p. C11015
Citas:
---------- APA ----------
Artana, C., Ferrari, R., Koenig, Z., Saraceno, M., Piola, A.R. & Provost, C. (2016) . Malvinas Current variability from Argo floats and satellite altimetry. Journal of Geophysical Research: Oceans, 121(7), 4854-4872.http://dx.doi.org/10.1002/2016JC011889
---------- CHICAGO ----------
Artana, C., Ferrari, R., Koenig, Z., Saraceno, M., Piola, A.R., Provost, C. "Malvinas Current variability from Argo floats and satellite altimetry" . Journal of Geophysical Research: Oceans 121, no. 7 (2016) : 4854-4872.http://dx.doi.org/10.1002/2016JC011889
---------- MLA ----------
Artana, C., Ferrari, R., Koenig, Z., Saraceno, M., Piola, A.R., Provost, C. "Malvinas Current variability from Argo floats and satellite altimetry" . Journal of Geophysical Research: Oceans, vol. 121, no. 7, 2016, pp. 4854-4872.http://dx.doi.org/10.1002/2016JC011889
---------- VANCOUVER ----------
Artana, C., Ferrari, R., Koenig, Z., Saraceno, M., Piola, A.R., Provost, C. Malvinas Current variability from Argo floats and satellite altimetry. J. Geophys. Res. Oceans. 2016;121(7):4854-4872.http://dx.doi.org/10.1002/2016JC011889
