Strong Mixing and Recirculation in the Northwestern Argentine Basin

The 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 Atl...

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Autores principales: Valla, D., Piola, A.R., Meinen, C.S., Campos, E.
Formato: JOUR
Materias:
general circulation
meridional overturning circulation
South Atlantic
water masses
western boundary current
flow velocity
general circulation model
gyre
hydrographic survey
intermediate water
meridional circulation
mixing
overturn
recirculating system
spatiotemporal analysis
subtropical region
water mass
Argentine Basin
Atlantic Ocean
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21699275_v123_n7_p4624_Valla
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_21699275_v123_n7_p4624_Valla
record_format dspace
spelling todo:paper_21699275_v123_n7_p4624_Valla2023-10-03T16:39:49Z Strong Mixing and Recirculation in the Northwestern Argentine Basin Valla, D. Piola, A.R. Meinen, C.S. Campos, E. general circulation meridional overturning circulation South Atlantic water masses western boundary current flow velocity general circulation model gyre hydrographic survey intermediate water meridional circulation mixing overturn recirculating system spatiotemporal analysis subtropical region water mass western boundary current Argentine Basin Atlantic Ocean The 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. ©2018. American Geophysical Union. All Rights Reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699275_v123_n7_p4624_Valla
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic general circulation
meridional overturning circulation
South Atlantic
water masses
western boundary current
flow velocity
general circulation model
gyre
hydrographic survey
intermediate water
meridional circulation
mixing
overturn
recirculating system
spatiotemporal analysis
subtropical region
water mass
western boundary current
Argentine Basin
Atlantic Ocean
spellingShingle general circulation
meridional overturning circulation
South Atlantic
water masses
western boundary current
flow velocity
general circulation model
gyre
hydrographic survey
intermediate water
meridional circulation
mixing
overturn
recirculating system
spatiotemporal analysis
subtropical region
water mass
western boundary current
Argentine Basin
Atlantic Ocean
Valla, D.
Piola, A.R.
Meinen, C.S.
Campos, E.
Strong Mixing and Recirculation in the Northwestern Argentine Basin
topic_facet general circulation
meridional overturning circulation
South Atlantic
water masses
western boundary current
flow velocity
general circulation model
gyre
hydrographic survey
intermediate water
meridional circulation
mixing
overturn
recirculating system
spatiotemporal analysis
subtropical region
water mass
western boundary current
Argentine Basin
Atlantic Ocean
description The 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. ©2018. American Geophysical Union. All Rights Reserved.
format JOUR
author Valla, D.
Piola, A.R.
Meinen, C.S.
Campos, E.
author_facet Valla, D.
Piola, A.R.
Meinen, C.S.
Campos, E.
author_sort Valla, D.
title Strong Mixing and Recirculation in the Northwestern Argentine Basin
title_short Strong Mixing and Recirculation in the Northwestern Argentine Basin
title_full Strong Mixing and Recirculation in the Northwestern Argentine Basin
title_fullStr Strong Mixing and Recirculation in the Northwestern Argentine Basin
title_full_unstemmed Strong Mixing and Recirculation in the Northwestern Argentine Basin
title_sort strong mixing and recirculation in the northwestern argentine basin
url http://hdl.handle.net/20.500.12110/paper_21699275_v123_n7_p4624_Valla
work_keys_str_mv AT vallad strongmixingandrecirculationinthenorthwesternargentinebasin
AT piolaar strongmixingandrecirculationinthenorthwesternargentinebasin
AT meinencs strongmixingandrecirculationinthenorthwesternargentinebasin
AT campose strongmixingandrecirculationinthenorthwesternargentinebasin
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