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Field experiments in the Brazil-Malvinas Confluence during early austral fall

AuthorsPelegrí, Josep Lluís ; Orúe-Echevarría, Dorleta ; Castellanos, Paola ; Emelianov, Mikhail ; García-Olivares, Antonio ; Gasser, Marc ; Hernández Guerra, Alonso; Isern-Fontanet, Jordi ; Machín, Francisco ; Masdeu Navarro, Marta ; Peña-Izquierdo, Jesús ; Piola, Alberto A.; Ramírez, Sergio ; Rosell Fieschi, Miquel ; Salat, Jordi ; Salvador, Joaquín ; Saraceno, Martin; Valla, Daniel; Vallès Casanova, Ignasi Berenguer ; Viúdez, Álvaro
Issue Date27-Aug-2017
CitationJoint Assembly IAPSO-AIAMA-IAGA (2017)
AbstractWe present the results of two field experiments carried in early austral fall over the Brazil-Malvinas Confluence (BMC) onboard the R/V Hespérides, each approximately lasting two weeks. The first experiment (March 2015) began encircling the BMC with hydrographic stations (lowered ADCP, CTD and water samples) along a perimeter of about 1200 km, in order to identify the water masses and fluxes reaching the BMC, and then sampled the collision region with six 100-km long and 400-m deep cross-frontal hydrographic sections. Data was also obtained from the vessel ADCP (velocities down to about 600 m), eight subsurface drifters and nine Argo floats. Here we describe the fluxes and structure of the BMC at three different scales: frontal, confluence and regional. The frontal sampling, approximately comprising a 200 km x 100 km region, shows intense cross-frontal property gradients (e.g. up to 20ºC in about 10 km at 50 m depth), numerous thermohaline intrusions (10-100 m thick, 10 km wide and 10-50 km long) and a very shallow (5-20 m) and fast (velocities close to 1.8 m/s) eastward surface brackish (salinities of 32-33) filament on the warm side of the front (narrowing from some 100 km over the slope to only a few kilometers in the outer stations). The confluence sampling followed the border of a 400 km x 200 km rectangle that encompassed the entire collision of the two impinging currents, characterized by large water recirculation in adjacent vortices (two anticyclones and one cyclone at distances less than 500 km from the collision point) before the eastward flushing along the frontal system. Finally, we used the ARMOR3D fields (Guinehut et al., 2012, Ocean Sci. 8, 845-857) to characterize the regional flow patterns and water masses, from 31ºS to 45ºS and from 38ºW to the continental platform. The second experiment (April 2017) will focus on the temporal and latitudinal evolution of the frontal system. It will include hydrographic and microstructure stations, the deployment of drifters and floats, and a towed vehicle to sample the uppermost 400 m of the water column
DescriptionJoint Assembly IAPSO-AIAMA-IAGA , Good Hope for Earth Sciences, 27 August - 1 September 2017, Cape Town, South Africa
Appears in Collections:(ICM) Comunicaciones congresos
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