Article
Environmental Sciences
Luana F. Bueno, Vladimir S. Costa, Guilherme N. Mill, Afonso M. Paiva
Summary: This study used multiple datasets to reconstruct the average vertical structure of North Brazil Current (NBC) rings and calculate their properties. The results show that NBC rings are characterized by large, intense, and relatively shallow features, which have significant impacts on the northward volume transport and meridional heat transport.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Cesar B. Rocha, Iury T. Simoes-Sousa
Summary: Recent studies show that the South Brazil Bight hosts strong westward propagating mesoscale eddies, with most of the observed eddy kinetic energy (EKE) being generated by local eddies, while remote eddies contribute minimally.
Article
Oceanography
Sonia Heye, Marjolaine Krug, Pierrick Penven, Michael Hart-Davis
Summary: This study uses high-resolution ocean models and particle tracking tools to improve understanding of the shelf circulation in the KwaZulu-Natal Bight off South Africa's east coast. The study reveals the presence of a northeastward counter current on the bight's shelf, which contributes to increased connectivity between Marine Protected Areas.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Environmental Sciences
Camila Fiaux Sukekava, Carlos Francisco Ferreira de Andrade, Luis Felipe Hax Niencheski, Marcio Silva de Souza, Luis M. Laglera
Summary: We investigated the concentrations and speciation of macronutrients and dissolved iron (DFe) in the South Brazil Bight during a coastal downwelling episode. The dominant NE winds and water convergence led to coastal downwelling, which resulted in high turbidity, deepening of nutrients, and bulging of isolines over the shelf and slope. Our measurements showed disentangled cycles of macronutrients, DFe, and iron ligands, with high DFe concentrations at the surface indicating aerial deposition and significant contributions from sediment and resuspended colloids. Iron ligand concentrations were higher than DFe concentrations and mainly derived from local biological processes. The injection of iron-humic complexes during summer upwelling episodes may contribute to the persistent high chlorophyll meanders over the shelf edge.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Ecology
E. Passos, L. Sancho, G. A. Moser, F. R. Piedras, R. P. Espindola, A. M. Fernandes
Summary: The responses of biogeochemical cycles and ecosystems are influenced by various physical conditions. The inflow of cold and nutrient-rich water into coastal embayments is ecologically significant. The study on the Southeast Brazil Bight reveals the impact of the Cabo Frio upwelling system and South Atlantic Central Water on Guanabara Bay. Cold water events in the SBB during the 2014-2015 summer resulted in an east-to-west flow, with a delayed response in Guanabara Bay. The analysis also highlighted the presence of different limiting nutrients in each area, leading to distinct trophic webs.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Oceanography
Danilo Augusto Silva, Dalton Kei Sasaki, Marcelo Dottori, Ilson Carlos Almeida da Silveira, Wellington Ceccopieri Belo, Renato Parkinson Martins
Summary: This study characterized subsurface intrusions of Tropical Waters at the South Brazil Bight, finding that these intrusions are relatively common year-round and have significant impacts on the thermodynamics and biogeochemistry of the coastal environment. The characteristics of these intrusions vary with the shelf width and depth.
CONTINENTAL SHELF RESEARCH
(2023)
Article
Multidisciplinary Sciences
Elan J. Portner, Owyn Snodgrass, Heidi Dewar
Summary: This study examines the foraging ecology of Pacific bluefin tuna in the California Current System. They found that the tuna's diet and foraging behavior varied over time, depending on the availability of prey. The study also highlights the importance of understanding the foraging ecology of this species for predicting its responses to changes in resource availability and its impact on fisheries.
Article
Oceanography
Andrea L. Oliveira, Natalia Rudorff, Milton Kampel, Shubha Sathyendranath, Mayza Pompeu, Amalia M. S. Detoni, Gabriel M. Cesar
Summary: The study of phytoplankton assemblages in the inner portion of the South Brazil Bight revealed a close relationship between phytoplankton bio-optical properties and size fractions. High proportions of diatoms, dinoflagellates, and cryptophytes were associated with low values of bio-optical indices, while cyanobacteria and green algae were associated with higher values.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Oceanography
Martinho Marta-Almeida, Anna Dalbosco, David Franco, Manuel Ruiz-Villarreal
Summary: The study conducted a thorough investigation on the plumes from the rivers in the South Brazilian Bight and South Brazil, revealing that the variability of river plumes on continental shelves is mainly driven by river runoff input, wind variability, and ambient currents. It also found that local river plumes are mainly controlled by wind forcing and are influenced by environmental currents.
Article
Remote Sensing
G. M. Cesar, N. M. Rudorff, A. L. Oliveira, A. M. Valerio, M. G. Chuqui, M. Pompeu, S. A. Gaeta, R. Frouin, M. Kampel
Summary: This study characterized the bio-optical variability at a coastal time series station in the South Brazil Bight and evaluated the performance of ocean colour algorithms for chlorophyll-a retrieval. Results showed that chlorophyll-a exhibited high variability and CDOM was the dominant optically significant constituent. The ocean colour algorithms performed reasonably well for chlorophyll-a retrieval.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2023)
Article
Oceanography
G. Gawarkiewicz, P. Fratantoni, F. Bahr, A. Ellertson
Summary: Shelfbreak exchange processes, particularly the Salinity Maximum Intrusion, have been extensively studied in the Middle Atlantic Bight. Recent data suggests that middepth intrusions are occurring more frequently and with greater salinity difference from ambient water compared to previous studies. The increase in frequency may be linked to a recent regime shift in the annual formation rate of Warm Core Rings by the Gulf Stream. Properly resolving this process in numerical simulations is necessary to account for salt budgets for the continental shelf and slope.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Ecology
Danilo A. Silva, Marcelo Dottori
Summary: The summer of 2013-2014 in Southeast Brazil saw record negative precipitation anomalies and highest sea surface temperatures, attributed to anomalous atmospheric blocking. This affected the thermohaline properties and circulation in the South Brazil Bight, leading to extreme conditions and impacts on the thermodynamic properties during blocking events. Further research is needed to understand the effects on biogeochemical properties.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Review
Oceanography
Weifeng (Gordon) Zhang, Philip Alatalo, Taylor Crockford, Andrew J. Hirzel, Meredith G. Meyer, Hilde Oliver, Emily Peacock, Christian M. Petitpas, Zoe Sandwith, Walker O. Smith Jr, Heidi M. Sosik, Rachel H. R. Stanley, Bethany L. F. Stevens, Jefferson T. Turner, Dennis J. McGillicuddy Jr
Summary: This study investigates the significant exchanges between the Mid-Atlantic Bight continental shelf and the neighboring open ocean induced by shelf water streamers generated by Gulf Stream warm-core rings. The satellite-measured data and in situ measurements show the evolution and characteristics of the streamer, including its onshore transport of heat and salt and offshore transport of organic carbon and oxygen.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Oceanography
Uchenna Nwankwo, Stephan Howden, Dmitri Nechaev, Brian Dzwonkowski
Summary: Sea level studies are lacking in the Mississippi Bight compared to other coastal waters in the USA. This study focused on subinertial sea level anomalies in the Mississippi Bight shelf and found that the geostrophic balance is the dominant factor influencing these anomalies. Using radar surface currents data and various analytical methods, the researchers were able to estimate and validate the subinertial sea level anomalies, with reasonable accuracy, by considering the geostrophic balance. The study also highlighted the importance of deploying Global Navigation Satellite System buoys for accurate absolute sea level estimation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Johanne Schulz-Stellemfleth, Silvia Foerderreuther, Jochen Horstmann, Joanna Staneva
Summary: Variational optimization is used to estimate uncertain parameters in a 3D barotropic circulation model of the German Bight, utilizing a 4DVAR assimilation scheme with various surface current measurements. The optimized model shows better agreement with observations in both short-term training and testing periods, but exhibits larger errors in shallow areas where no observations were used for tuning.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Afonso M. Paiva, Victor B. Daher, Vladimir S. Costa, Simone S. B. Camargo, Guilherme N. Mill, Mariela Gabioux, Joao B. R. Alvarenga
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Article
Oceanography
Luiz Alexandre A. Guerra, Afonso M. Paiva, Eric P. Chassignet
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2018)
Article
Oceanography
Lis Bittencourt, William Soares-Filho, Isabela Maria Seabra de Lima, Sudhir Pai, Jose Lailson-Brito, Leonardo Martins Barreira, Alexandre Freitas Azevedo, Luiz Alexandre A. Guerra
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2018)
Article
Oceanography
Pedro Paulo de Freitas, Felipe de Luca Lopes Amorim, Guilherme Nogueira Mill, Vladimir Santos da Costa, Mariela Gabioux, Mauro Cirano, Afonso de Moraes Paiva
Article
Oceanography
Pedro Paulo de Freitas, Afonso de Moraes Paiva, Mauro Cirano, Guilherme Nogueira Mill, Vladimir Santos da Costa, Mariela Gabioux, Bruna Reis Leite Franca
Summary: This study investigates the propagation of coastal trapped waves (CTWs) along the Brazilian continental shelf, showing a decrease in energy and change in phase speed propagation along the coast, predominantly due to abrupt variations in the width and depth of the continental shelf. Furthermore, the CTWs exhibit different phase speeds along the coast, attributed to differences in shoreline morphology.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Bruno Vicente Primo de Siqueira, Afonso de Moraes Paiva
Summary: The aim of this study is to improve sea level prediction along the southeastern Brazilian coast using data-based models, which can correct errors in traditional hydrodynamic models by integrating a neural network. By combining both approaches, errors in predicting sea level variability are reduced by approximately 50% for the atmospherically forced frequency band.
Article
Environmental Sciences
Luana F. Bueno, Vladimir S. Costa, Guilherme N. Mill, Afonso M. Paiva
Summary: This study used multiple datasets to reconstruct the average vertical structure of North Brazil Current (NBC) rings and calculate their properties. The results show that NBC rings are characterized by large, intense, and relatively shallow features, which have significant impacts on the northward volume transport and meridional heat transport.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Luiz Alexandre A. Guerra, Guilherme N. Mill, Afonso M. Paiva
Summary: The Agulhas rings play a crucial role in transporting warm and salty waters, nourishing the surface circulation of the Atlantic Meridional Overturning Circulation. They are responsible for advecting mode waters from the Cape Basin to the western side of the Atlantic. The interaction with bottom topography and other vortices, ocean-atmosphere exchanges, and decay are all factors that affect the spreading of mode waters.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Ilson C. A. da Silveira, Piero S. Bernardo, Caue Z. Lazaneo, Milton Borges -Silva, Rafael C. Martins, Daniel M. C. Santos, Marcelo Dottori, Wellington C. Belo, Renato P. Martins, Luiz A. A. Guerra, Daniel L. Moreira
Summary: This work focuses on the circulation in the Santos Basin during the SANSED winter 2019 survey. The dominant features observed are the Atlantic southwestern boundary current regime and remotely-generated anticyclones and cyclones. The interaction between the boundary currents, their meanders, and the anticyclonic rings is complex and varies widely. The presence of ancienter cyclonic eddies may interfere with the propagation of large anticyclones.
OCEAN AND COASTAL RESEARCH
(2023)
Article
Marine & Freshwater Biology
Ilson C. A. da Silveira, Piero S. Bernardo, Caue Z. Lazaneo, Joao P. M. Amorim, Milton Borges-Silva, Rafael C. Martins, Daniel M. C. Santos, Marcelo Dottori, Wellington C. Belo, Renato P. Martins, Luiz A. A. Guerra, Daniel L. Moreira
Summary: This study describes the circulation patterns in the Santos Basin during the winter 2019 survey, focusing on the continental slope and the Sao Paulo Plateau. The observed circulation is mainly influenced by the Atlantic southwestern boundary current regime and remotely-generated anticyclones and cyclones. The interaction between these currents and vortical rings is complex and varies widely.
OCEAN AND COASTAL RESEARCH
(2023)
Article
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)
