Regional modeling of the water masses and circulation annual variability at the Southern Brazilian Continental Shelf

Mendonça, Luís Felipe Ferreira de; Souza, Ronald Buss de; Aseff, C. R. C.; Pezzi, Luciano Ponzi; Möller, Osmar Olinto; Alves, Rita de Cássia Marques

doi:10.1002/2016jc011780

Cited by 27 publications

(37 citation statements)

References 69 publications

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“…Nevertheless, the offshore export of SASW throughout the STSF is lower than the offshore detrainment that occurs at about ~36.5–37°S. Results recently reported by Mendonça et al () are in agreement with ours: they show a clear seasonal change in the volume of the STSF and the SASW seasonal variability in the offshore region.…”

Section: Resultssupporting

confidence: 92%

“…Near ~40°S, two 1‐year current meter series have shown that the dynamics of the currents over the shelf is dominated by the wind; the average of the currents follow the NNE direction as predicted by the models (M. Saraceno, personal communication, January 05, 2018). Circulation patterns over the shelf have been therefore indirectly inferred mainly from hydrographic observations (Lucas et al, ; Möller et al, ; Piola et al, , ) and from regional‐scale numerical simulations (Combes & Matano, ; Matano et al, ; Mendonça et al, ; Palma, Matano, Piola, & Sitz, ; Palma, Matano, & Piola, ; Palma et al, ; Pereira, ; Simionato et al, ; Soares et al, ). Seasonal changes of the circulation over the outer shelf are greatly influenced by the contiguous western boundary currents and their confluence zone (Combes & Matano, ; Matano et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Offshore Export of Subantarctic Shelf Waters From the Patagonian Shelf

et al. 2018

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It has been suggested that the Subtropical Shelf Front (STSF) could be a preferential site for the detrainment of Subantarctic Shelf Water (SASW) and related planktonic shelf species onto the open SW Atlantic Ocean. The offshore detrainment of SASW and planktonic shelf species might be an exportation mechanism, affecting the population abundances of fishing resources in Argentina, Uruguay, and Southern Brazil. In this study, we characterize for the first time the 3-D structure of the STSF and the main routes of offshore export of SASW from the Patagonian shelf during austral summer (summer and early fall) and winter (winter and early spring) by using numerical hydrodynamical model results and Lagrangian tracking simulations of neutrally buoyant floats. The transport of SASW toward the open ocean is~1 Sv (1 Sv = 10 6 m 3 /s) during summer and~0.8 Sv during winter. SASW are exported offshore mainly near the Brazil-Malvinas Confluence region during both seasons. The STSF appears to act as an important retention mechanism for the plankton over the inner and middle shelf mainly during late summer and early fall. Our findings could explain the life cycle of distinct fish species that are distributed in the region, as well as the population abundance variability of such species.Plain Language Summary The Subtropical Shelf Front (STSF) has been suggested to be a preferential site for the detrainment of Subantarctic Shelf Water (SASW) from the Patagonian continental shelf toward the open ocean. This offshore detrainment of SASW might be an exportation mechanism to the open ocean of early larval stages of life of shelf fish species, affecting the population abundances of fishing resources in Argentina, Uruguay, and Southern Brazil. In this work we characterize the 3-D structure of the STSF, its dynamics and variability, and the main routes of offshore export of SASW during austral summer and winter for the first time. We discover that the main offshore detrainment of SASW occurs near the Brazil-Malvinas Confluence, while the STSF appears to act as an important retention mechanism for early larval stages of life of shelf fish species mainly during late summer and early fall. Our findings could explain the life cycle of distinct fish species that are distributed in the region, as well as the population variability of such species.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Modeling the Offshore Export of Subantarctic Shelf Waters From the Patagonian Shelf

et al. 2018

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“…The current scientific knowledge of processes related to momentum fluxes in the vicinity of the BMC is still mainly based on bulk formulations derived in studies for other regions and applied to satellite data sets (O'Neill et al, 2010), numerical simulations (de Camargo et al, 2013;Mendonça et al, 2017), and radiosonde measurements (Acevedo et al, 2010;Pezzi et al, 2016). In this context, the Air-Sea Interaction at Brazil-Malvinas Confluence, INTERCONF (Pezzi et al, 2009), is an important project in which direct measurements of atmospheric turbulence parameters are carried out on the Brazilian Polar Ship Almirante Maximiano H-41.…”

Section: Introductionmentioning

confidence: 99%

The Role of Roughness and Stability on the Momentum Flux in the Marine Atmospheric Surface Layer: A Study on the Southwestern Atlantic Ocean

et al. 2018

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For the first time, in situ turbulence measurements collected in the vicinity of the Brazil‐Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high‐frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air‐Sea Interaction at Brazil‐Malvinas Confluence project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m/s when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero‐plane displacement in the order of 0.1 to 1 m as an indication for a wave‐induced roughness layer. In addition, the analysis of the turbulent kinetic energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.

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“…The eddy kinetic energy of quasi‐permanent meanders and vortices of the Brazil Current intensifies southwards (e.g., Assireu, Dauhut, Santos, & Lorenzzetti, ). Further south, the Brazilian Coastal Current (BCC in Figure ) flows most of the year along the inner Uruguay and Pelotas shelves to the northeast, paralleling the Brazil Current but in the opposite direction, up to the centre of the Santos shelf (Mendoça et al, ; de Souza & Robinson, ).…”

Section: Regional Settingmentioning

confidence: 99%

What feeds shelf‐edge clinoforms over margins deprived of adjacent land sources? An example from southeastern Brazil

et al. 2019

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In southeastern Brazil, the Serra do Mar coastal mountain range blocks the sediment influx from arriving at a ca. 1,500 km long continental margin comprising Santos and Pelotas basins. Despite this deprivation, the margin accumulated a ca. 1 km thick sedimentary succession since the Mid‐Miocene. Examination of seismic reflection and oceanographic data indicates that shelf‐margin clinoform formation exhibits a regional variability, with major sigmoidal clinoforms developed in the transitional area between both basins. Laterally, poorly developed oblique clinoforms constitute isolated depocenters along the shelf margin. The continuous clinoform development in the transitional area is attributed to the major influence on sediment transport patterns of several ocean bottom currents flowing along the margin, such as the Brazil Coastal Current, the Brazil Current and the Intermediate Water Brazil Current. These currents erode, transport and distribute sediments across the shelf break and upper slope from distant sediment sources located either north or south of the study area. The progressive southward strengthening of the Brazil Current could be responsible for a major southward sediment redistribution from the northern Campos Basin, and/or for sediment entrainment from northward‐induced transport by the Brazil Coastal Current, originally derived from the De la Plata Estuary. In the transition between Santos and Pelotas basins, the Intermediate Water Brazil Current splits forming the Santos Bifurcation, allowing for a continuous depositional process and clinoform generation. We suggest that ocean bottom currents may shape other shelf‐edge ‘contouritic clinoforms’ in continental margins mainly constructed by along‐strike sediment transport largely driven by long‐term geostrophic currents.

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Regional modeling of the water masses and circulation annual variability at the Southern Brazilian Continental Shelf

Cited by 27 publications

References 69 publications

Modeling the Offshore Export of Subantarctic Shelf Waters From the Patagonian Shelf

Modeling the Offshore Export of Subantarctic Shelf Waters From the Patagonian Shelf

The Role of Roughness and Stability on the Momentum Flux in the Marine Atmospheric Surface Layer: A Study on the Southwestern Atlantic Ocean

What feeds shelf‐edge clinoforms over margins deprived of adjacent land sources? An example from southeastern Brazil

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