Strong Mixing and Recirculation in the Northwestern Argentine Basin

Daniel Valla; Alberto R. Piola; Christopher S. Meinen; Edmo Campos

doi:10.1029/2018jc013907

journal article Jul 01, 2018

Strong Mixing and Recirculation in the Northwestern Argentine Basin

Daniel Valla

Alberto R. Piola

Christopher S. Meinen

Edmo Campos

Journal of Geophysical Research: Oceans Vol. 123 No. 7 pp. 4624-4648 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/2018jc013907

Abstract

AbstractThe Atlantic component of the Meridional Overturning Circulation (AMOC) is a key contributor to the global meridional transport of volume, salt, and heat, and thus plays a central role in global climate. As part of ongoing efforts to monitor the intensity and variability of the AMOC in the South Atlantic, hydrographic sections have been regularly occupied since 2009 near the western boundary along a zonal line at 34.5°S. Here this high‐quality, high‐resolution data set is analyzed to establish the average hydrographic conditions of the northwestern Argentine Basin and the water mass spatial and temporal variability. The water mass analysis also reveals the pathways of the flow in this region, which are further corroborated by full‐depth direct velocity measurements. The repeated hydrographic sections capture an extremely rich vertical structure, characterized by seven distinct water mass layers of northern and southern origin, each with unique property signatures. Almost all of these layers exhibit a sharp zonally banded structure, which is indicative of recirculation cells offshore from the western boundary. The circulation at intermediate levels includes a previously undetected recirculation cell confined very close to the western boundary and superimposed on the classical intermediate water pathway beneath the South Atlantic subtropical gyre. The deep level flow is characterized by the Deep Western Boundary Current (DWBC) and a northward recirculation ~500 km east from the slope.

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References

75

[1]

10.1002/2014eo060001

[2]

10.1029/2001jc000963

[3]

10.1016/s0967-0645(98)00110-6

[4]

10.1029/1999gl002355

[5]

10.1175/1520-0485(2000)030<0764:lootdw>2.0.co;2

[6]

10.1038/nature07979

[7]

Boyer T. P. (2013)

[8]

10.1016/s0967-0637(99)00075-8

[9]

10.1029/95jc03721

[10]

Break-up of the Atlantic deep western boundary current into eddies at 8° S

M. Dengler, F. A. Schott, C. Eden et al.

Nature 10.1038/nature03134

[11]

10.1002/2014gl060428

[12]

10.1029/2009gl039356

[13]

10.5194/os-12-481-2016

[14]

10.1038/35051500

[15]

10.1016/0967-0637(93)90118-m

[16]

10.1016/j.dsr.2015.05.008

[17]

10.1016/j.dsr2.2010.10.063

[18]

10.1016/0198-0149(81)90012-1

[19]

10.1029/jc086ic07p06556

[20]

10.1016/0198-0149(81)90033-9

[21]

10.1016/0198-0149(86)90091-9

[22]

10.1016/0198-0149(86)90054-3

[23]

10.1029/92jc00485

[24]

10.1002/2014jc010113

[25]

10.1002/2015gl065254

[26]

IOC IHO andBODC(2003).Centenary Edition of the GEBCO Digital Atlas Edited Intergovernmental Oceanographic Commission and the International Hydrographic Organization as part of the General Bathymetric Chart of the Oceans British Oceanographic Data Centre.

[27]

10.1175/1520-0485(1997)027<0237:andvft>2.0.co;2

[28]

Langdon C.(2010).Determination of dissolved oxygen in seawater by Winkler titration using the amperometric technique IOCCP rep. 14 ICPO Publ. Ser. 134 Version 1 (pp. 1–18).

[29]

10.1016/j.dsr2.2012.07.028

[30]

10.1016/j.dsr2.2012.07.037

[31]

10.1029/2010jc006285

[32]

10.1175/jpo3130.1

[33]

10.1007/978-3-642-80353-6_8

[34]

10.1016/j.pocean.2014.10.006

[35]

10.5194/os-13-175-2017

[36]

10.5194/os-8-1041-2012

[37]

10.1002/2013jc009228

[38]

10.1016/s0079-6611(00)00032-x

[39]

Mémery L. Arhan M. Billant A. Branellec P. &Mercier H.(1995).Campagne CITHER 2 N/O Maurice Ewing 4 janvier‐21 mars 1994. Recueil de Données. Volume 2: Données CTD‐O2. Rep.

[40]

10.1029/97jc03529

[41]

10.1016/s0079-6611(99)00004-x

[42]

10.4031/mtsj.49.2.14

[43]

10.1126/science.290.5498.1947

[44]

10.1029/1999jc000300

[45]

10.1016/0198-0149(82)90002-4

[46]

10.1016/0198-0149(89)90015-0

[47]

10.1016/j.dsr.2012.12.013

[48]

10.1029/1999jc900049

[49]

10.1016/0079-6611(89)90001-3

[50]

10.1175/1520-0485(1977)007<0062:otcaco>2.0.co;2

Showing 50 of 75 references

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References

Details

Published: Jul 01, 2018
Vol/Issue: 123(7)
Pages: 4624-4648
License: View

Authors

D

Daniel Valla

Departamento Oceanografía, Servicio de Hidrografía Naval, Departamento Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, and UMI/IFAECI, CONICET Buenos Aires Argentina

A

Alberto R. Piola

Departamento Oceanografía, Servicio de Hidrografía Naval, Departamento Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, and UMI/IFAECI, CONICET Buenos Aires Argentina

C

Christopher S. Meinen

Atlantic Oceanographic and Meteorological Laboratory Miami FL USA

E

Edmo Campos

Instituto Oceanográfico Universidade de São Paulo São Paulo Brazil

Funding

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico Award: 302018/2014‐0

Climate Program Office

Cite This Article

Daniel Valla, Alberto R. Piola, Christopher S. Meinen, et al. (2018). Strong Mixing and Recirculation in the Northwestern Argentine Basin. Journal of Geophysical Research: Oceans, 123(7), 4624-4648. https://doi.org/10.1029/2018jc013907

Strong Mixing and Recirculation in the Northwestern Argentine Basin

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