Dataset on the TIC-MOC cruise onboard the R/V Hespérides, March 2015, Brazil-Malvinas Confluence

Orúe‐Echevarría, Dorleta; Pelegrí, Josep Lluís; Alonso-González, Iván J.; Benítez-Barrios, V.M.; Fuente, P. de la; Emelianov, Mikhail; Gasser, Marc; Herrero, Carmen de la Guardia; Isern‐Fontanet, Jordi; Peña-Izquierdo, Jesús; Ramírez-Garrido, Sergio; Fieschi, Miquel Rosell; Salvador, Joaquín; Saraceno, Martín; Valla, Daniel; Vidal, Montserrat

doi:10.1016/j.dib.2018.12.004

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The positioning of the hydrographic stations relative to the BMC was done using near real‐time remote sensing altimetry and temperature data (see next section), as well as one‐week‐window daily forecasts of sea‐surface absolute dynamic topography (ADT) and temperature, salinity, and velocity at 0, 92, 453, and 1062 m, as provided by the Mercator Ocean PSY4QV2R2 operational model, with 1/12° resolution (https://www.mercator-ocean.fr/). A full description of the cruise methods and sampling is presented by Orúe‐Echevarría et al () and the entire data set is available at Pelegrí et al (), a summary follows.…”

Section: Datamentioning

confidence: 99%

Inverse Modeling the Brazil‐Malvinas Confluence

et al. 2019

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The Brazil-Malvinas Confluence arises from the frontal encountering of the subtropical Brazil Current and subantarctic Malvinas Current. It displays a complex regional circulation that is accompanied by mesoscale features and thermohaline intrusions. Here we combine altimetry and cruise data to describe the circulation pattern in the upper 2,000 m at two spatial scales encircling the frontal system. The major regional features appear south of the confluence latitude at 39-40°S: (a) a relatively weak Malvinas Current near 41°S, 56°W (28.3 ± 1.4 Sv), followed by its cyclonic retroflection; (b) an intense subtropical anticyclone (59.3 ± 10.7 Sv) that replaces the Brazil Current overshoot; and (c) a very intense subantarctic inflow (78.9 ± 13.7 Sv) near 53°W that is maintained through both an upstream (near 42°S) earlier diversion of the Malvinas Current and the cyclonic recirculation of the flow exiting east along the confluence. North of the confluence, the Brazil Current provides a net input of 30.8 ± 12.0 Sv (29.1 ± 8.3 Sv along the slope). The southern inflow splits nearly equal between barotropic and baroclinic contributions while the entire northern flow is essentially baroclinic. These northern and southern inputs add to an eastward along-front transport of 109.7 ± 15.1 Sv, with significant contribution of highly oxygenated, relatively fresh Subantarctic Mode and Antarctic Intermediate Waters (58.7 ± 5.6 Sv). The regional circulation experiences substantial temporal variability, with southern waters flowing into the Brazil-Malvinas Confluence through along-slope and interior pathways and partly recirculating within the subtropical South Atlantic gyre. Plain Language SummaryThe Brazil Malvinas Confluence is an intense frontal system, the meeting point of the southward Brazil Current, which transports subtropical relatively warm, salty, and poorly oxygenated waters, and the Malvinas Current, carrying subantarctic relatively fresh, cold, and highly oxygenated waters. Here we examine the conditions in the confluence at the time of the TIC-MOC cruise, paying special attention to their previous evolution. South of the confluence (39-40°S), the circulation is characterized by a relatively weak along-slope Malvinas Current and an interior intense dipole while north of the confluence the main current is the along-slope Brazil Current; the southern and northern inputs conduce to a very intense eastward along-front South Atlantic Current. We find that the conditions at the confluence are forced by both the impinging boundary currents and the interior ocean conditions. Further, the confluence is a site where subantarctic waters flow underneath the subtropical layers and recirculate south after experiencing substantial transformations in the subtropical gyre. We may conclude that the confluence acts both as a barrier and a blender of subtropical and subantarctic waters, of especial relevance in the meridional transport of heat and other properties. Key Points:• We apply an inverse model to determine barotropic, baroclinic...

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Section: Datamentioning

confidence: 99%

Inverse Modeling the Brazil‐Malvinas Confluence

et al. 2019

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“…We next present a brief description of both the cruise and the methodology for data acquisition and processing. Further information can be found in Orúe-Echevarría et al (2019a) and the data are available in Pelegrí et al (2018).…”

Section: Field Measurementsmentioning

confidence: 99%

A view of the Brazil-Malvinas confluence, March 2015

Orúe‐Echevarría

Pelegrí

Alonso-González

et al. 2021

Deep Sea Research Part I: Oceanographic Research Papers

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“…On the contrary, direct measurements of their structure remain rare. Two cruises of R/V Hesperides performed in March 2015 (Orúe‐Echevarría, Pelegrí, Alonso‐González, et al., 2019) and April 2017 (Orúe‐Echevarría et al., 2020) were dedicated to measurements of temperature, salinity, and velocities at the strong front near the collision of the Brazil and MCs. Orúe‐Echevarría, Pelegrí, Machín, et al.…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, direct measurements of their structure remain rare. Two cruises of R/V Hesperides performed in March 2015 (Orúe-Echevarría, Pelegrí, Alonso-González, et al, 2019) and April 2017 (Orúe-Echevarría et al, 2020) were dedicated to measurements of temperature, salinity, and velocities at the strong front near the collision of the Brazil and MCs. Orúe-Echevarría, Pelegrí, Machín, et al (2019) show that circulation within the BMC strongly depends on the MC, BC, and Zapiola Gyre conditions and provides in situ information about dynamic properties of the BMC frontal system.…”

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Dynamic Structure of Eddies of the Brazil‐Malvinas Confluence Zone Revealed by Direct Measurements and Satellite Altimetry

Frey,

Kubryakov

2023

JGR Oceans

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The goal of this work is to study the dynamical structure of eddies of the Brazil‐Malvinas Confluence zone (BMC eddies) using direct velocity measurements carried out by Shipborne Acoustic Doppler Current Profiler during five oceanographic cruises performed in 2016–2022. In total, in situ data of 13 BMC eddies, including nine anticyclones and four cyclones are available. These data show that the orbital velocity in such eddies can reach 189 cm/s and their vertical structure is highly barotropic. In several eddies, the velocities exceeding 100 cm/s are observed down to a depth of 560 m and at a depth of 800 m they are still higher than 80 cm/s. The spatial structure of velocity and horizontal shear in the eddies is strongly asymmetric, with higher velocities in the southern part near the intense thermohaline BMC front. Altimetry data show qualitative agreement with in situ data, but underestimate the horizontal velocity shear and the maximum velocities at the periphery of the BMC eddies. We also use satellite altimetry and Argo float measurements to study these eddies, and estimate their impact on the thermohaline structure. The analysis shows that the eddies with orbital velocities exceeding 100 cm/s cause intense temperature and salinity anomalies reaching 7–9°C and 1 psu in anticyclones and −4°C and 0.8 psu in cyclones at 100–300 m depth.

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Dataset on the TIC-MOC cruise onboard the R/V Hespérides, March 2015, Brazil-Malvinas Confluence

Cited by 4 publications

References 3 publications

Inverse Modeling the Brazil‐Malvinas Confluence

Inverse Modeling the Brazil‐Malvinas Confluence

A view of the Brazil-Malvinas confluence, March 2015

Dynamic Structure of Eddies of the Brazil‐Malvinas Confluence Zone Revealed by Direct Measurements and Satellite Altimetry

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