Article
Geochemistry & Geophysics
Alessio Sanfilippo, Vincent J. M. Salters, Sergey Y. Sokolov, Alexander A. Peyve, Andreas Stracke
Summary: The upper mantle is a mixture of refractory and recycled crustal domains, with the recycled portions dominating the composition of surface basalts. Hf isotope ratios may provide hints for melting of refractory source materials in basalts, allowing the identification of depleted mantle materials. Basalts from the Arctic Atlantic show high Hf isotope ratios, suggesting a highly depleted asthenospheric mantle source beneath this region.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Environmental Sciences
Jingxuan Wei, Kathryn L. Gunn, Robert Reece
Summary: This study investigates the spatial distribution of diapycnal mixing in the central South Atlantic thermocline and its drivers using seismic reflection data. The results show that thermocline diffusivities have changed little in this region, but exhibit heterogeneity at mesoscales. The Mid-Atlantic Ridge and near-inertial storms are identified as important drivers of mixing.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Cristina Arumi-Planas, Maria Dolores Perez-Hernandez, Josep L. Pelegri, Pedro Velez-Belchi, Mikhail Emelianov, Veronica Cainzos, Luis Cana, Yvonne L. Firing, Luis Garcia-Weil, Daniel Santana-Toscano, Alonso Hernandez-Guerra
Summary: The South Atlantic Ocean plays a crucial role in the heat exchange of the climate system by hosting the returning flow of the Atlantic Meridional Overturning Circulation (AMOC). Through data analysis from hydrographic cruises, we have identified different water masses and calculated their circulation patterns in the South Atlantic Subtropical gyre. We have also assessed the strength of the AMOC, heat transport, and freshwater flux in this region.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Engineering, Marine
Tianxiao Ji, Zhigang Zeng
Summary: This paper presents new data on the major elements, trace elements, and Nd-Hf isotopes of south mid-Atlantic ridge (SMAR) MORBs. The geochemical characteristics, including enrichment of fluid-mobile elements and anomalous trace element ratios, suggest that these MORBs have been modified by subduction.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Imants G. Priede, Frank E. Muller-Karger, Tomasz Niedzielski, Andrey V. Gebruk, Daniel O. B. Jones, Ana Colaco
Summary: This study examines the main drivers that may increase biomass and biodiversity of non-chemosynthetic benthic megafauna in the lower bathyal of the Mid-Atlantic Ridge. The findings suggest that primary production in surface waters is not significantly different between the MAR and abyssal regions, but the quantity of organic matter reaching the sea floor is higher on the MAR due to shorter vertical transport distance. Depth variation, substrate heterogeneity, and the presence of a biogeographic overlap zone also contribute to increased biodiversity. However, more intensive biological sampling is urgently needed in the proposed mining areas south of the Azores.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
David Schlaphorst, Catherine A. Rychert, Nicholas Harmon, Stephen P. Hicks, Petros Bogiatzis, J-Michael Kendall, Rachel E. Abercrombie
Summary: Seismicity along transform faults provides important constraints for understanding earthquake ruptures. This study presents the first local seismicity catalog of slow spreading ridges based on data recorded by a temporary broad-band network. Most of the earthquakes are located along the Chain Transform Fault, Romanche transform fault, and the Mid-Atlantic Ridge. The seismic events are characterized by normal faulting along the ridge and strike-slip faulting along the transforms, with some reverse mechanisms.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Environmental Sciences
Jose Angel Alvarez Perez, Rodrigo Sant'Ana
Summary: Temperatures in the southwest South Atlantic Ocean have been increasing in recent decades, primarily due to changes in Brazil's Current dynamics. This has had significant impacts on marine ecosystems, but the effects on demersal fauna are not well understood. A study in Santa Catarina, Brazil, analyzed commercial demersal catches between 2000 and 2019 and found evidence of megafauna tropicalization in the region. The mean temperature of catches has been rising since 2013, correlating with changes in bottom water temperatures and transport volumes of the Brazil Current.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Pengyuan Guo, Yaoling Niu, Pu Sun, Junjie Zhang, Shuo Chen, Meng Duan, Hongmei Gong, Xiaohong Wang
Summary: The study provides new Sr-Nd-Hf isotopic data on mid-ocean ridge basalts from the Oceanographer and Hayes fracture zones at the Mid-Atlantic Ridge to constrain the nature and origin of upper mantle heterogeneity. The data illustrate that the mantle sources of these lavas comprise three components, including ADM, E-type I, and E-type II components, which explain the contrast in crustal thickness, ridge morphology, and mantle Bouguer anomalies between the two ridge segments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
C. Peirce, M. J. Funnell, T. J. Reston, C. J. MacLeod
Summary: This study models the structure of multiple OCCs on the Mid-Atlantic Ridge using seismic tomography. The results suggest that the formation of OCCs may be influenced by the presence of magma and the characteristics of the crust. The study also investigates the drivers of hydrothermal circulation in different vent fields, revealing varying mechanisms in different regions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Ecology
Manuel Ramos Martins, Jorge Assis, David Abecasis
Summary: The study used machine learning models with biologically meaningful predictors to project the future distribution shifts of 10 commercially important demersal fish species in the Northern Atlantic Ocean. Compliance with the Paris Agreement could lead to reduced distributional shifts under future climate change scenarios, supporting biodiversity conservation and resource management.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2021)
Article
Geochemistry & Geophysics
Fei Wu, Simon Turner, Kaj Hoernle, Folkmar Hauff, Bruce F. Schaefer, Thomas Kokfelt, Ilya Bindeman
Summary: Stable barium (Ba) isotopes are being used as tracers for the recycling of crustal material into the mantle. Small but significant Ba isotope variations have been found in global MORB, and this study provides new constraints on the Ba isotope composition of the depleted upper mantle and the origin of Ba isotope heterogeneity in MORB. The results indicate that recycled altered oceanic crust and crustal sedimentary materials play important roles in the chemical budget of the upper mantle.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Ecology
Daniel van Denderen, Aurore A. Maureaud, Ken H. Andersen, Sarah Gaichas, Martin Lindegren, Colleen M. Petrik, Charles A. Stock, Jeremy Collie
Summary: Theory predicts that fish community biomass will decline with increasing temperature due to higher metabolic losses. However, whether these predictions explain observed macroecological patterns in fish community biomass is unknown. This study tests these predictions and finds that temperature is the main driver of cross-regional variation in fish community biomass.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2023)
Article
Chemistry, Physical
Valentine Combaudon, Isabelle Moretti, Barbara I. Kleine, Andri Stefansson
Summary: Hydrogen emissions from geothermal fields in Iceland are comparable to those along the mid-Atlantic Ridge, with concentrations mainly influenced by rock type and source water composition. Geothermal power plants in Iceland emit approximately 1.2 kt H-2 per year, which could potentially be utilized given the implementation of necessary extraction technologies.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Jiarong Qing, Yongqiang Shen
Summary: The study investigates the development of subduction in the tectonic setting where mid-ocean ridges and passive continental margins are juxtaposed using a 2-D numerical model. The results reveal three types of oceanic plate subduction: continental margin subduction, ridge-inversed subduction, and a transitional type with double subduction along ridges and margins. The physical parameters that influence the formation of these subduction types are systematically analyzed. The study emphasizes the significance of preexisting weakness along passive margins in promoting subduction development.
Article
Oceanography
Clement Vic, Bruno Ferron
Summary: The first two-dimensional in situ observation of an internal tide beam generated by the interaction of the barotropic tidal current with a supercritical abyssal hill over the Mid-Atlantic Ridge (MAR) was reported using a shipboard acoustic Doppler current profiler. A vertical mode decomposition revealed that the velocity field was dominated by modes 1 to 3, with higher modes displaying localized and not persistent bursts of energy. The observed variability of the tidal beam could be explained by refraction by mesoscale currents.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Correction
Biodiversity Conservation
Rachel E. Ball, Barbara Serra-Pereira, Jim Ellis, Martin J. Genner, Samuel Iglesias, Andrew F. Johnson, Catherine S. Jones, Rob Leslie, Jennifer Lewis, Stefano Mariani, Gui Menezes, Francis Neat, Leslie R. Noble, David W. Sims, Andrew M. Griffiths
CONSERVATION GENETICS
(2019)
Article
Zoology
Sampaio Iris, Freiwald Andre, Porteiro Filipe Mora, Menezes Gui, Carreiro-Silva Marina
Article
Zoology
Iris Sampaio, Marina Carreiro-Silva, Andre Freiwald, Gui Menezes, Manfred Grasshoff
Article
Environmental Sciences
Guilherme Teixeira, Joana Raimundo, Joana Goulart, Valentina Costa, Gui M. Menezes, Miguel Caetano, Mario Pacheco, Ines Martins
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Oceanography
Rita Carrico, Monica A. Silva, Gui M. Menezes, Manuel Vieira, Marta Bolgan, Paulo J. Fonseca, M. Clara P. Amorim
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2020)
Correction
Environmental Sciences
Guilherme Teixeira, Joana Raimundo, Joana Goulart, Valentina Costa, Gui M. Menezes, Miguel Caetano, Mario Pacheco, Ines Martins
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Fisheries
Diana Catarino, Kirsten Jakobsen, Joachim Jakobsen, Eva Giacomello, Gui M. Menezes, Hugo Diogo, Angela Canha, Filipe M. Porteiro, Octavio Melo, Sergio Stefanni
JOURNAL OF FISH BIOLOGY
(2020)
Article
Ecology
Susanne E. Tanner, Eva Giacomello, Gui M. Menezes, Alice Mirasole, Joao Neves, Vera Sequeira, Rita P. Vasconcelos, Ana Rita Vieira, John R. Morrongiello
Article
Fisheries
Patricia Amorim, Pedro Sousa, Ernesto Jardim, Manuela Azevedo, Gui M. Menezes
FISHERIES RESEARCH
(2020)
Article
Ecology
Mario Pinho, Wendell Medeiros-Leal, Michael Sigler, Regis Santos, Ana Novoa-Pabon, Gui Menezes, Helder Silva
REGIONAL STUDIES IN MARINE SCIENCE
(2020)
Article
Fisheries
Odd Aksel Bergstad, Rebecca H. Hunter, Nicola J. Cousins, David M. Bailey, Terje Jorgensen
Summary: Nineteen species of the deep-water fish family Macrouridae inhabit the Mid-Atlantic Ridge (MAR) of the North Atlantic. Size, age structure, longevity and length at age were explored for seven of the more abundant species, revealing relatively low growth rates but significant interspecific variation in longevity. Age estimates derived from growth increments in otoliths provided the basis for studies of age structure, growth, and longevity within this family of deep-sea fish.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Oceanography
Diya Das, Jose Manuel Gonzalez-Irusta, Telmo Morato, Laurence Fauconnet, Diana Catarino, Pedro Afonso, Claudia Viegas, Luis Rodrigues, Gui Menezes, Alexandra Rosa, Mario Rui Rilho Pinho, Helder Marques da Silva, Eva Giacomello
Summary: Elasmobranchs inhabiting depths beyond 200 m are at high risk of overexploitation, but little information is available for management strategies in the deep sea. This study used over 20 years of data to model the spatial distribution of 15 species of deep-sea elasmobranchs in the Azores Archipelago, and proposed using depth, area, and gear-based tactics to reduce unwanted catches.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Review
Chemistry, Medicinal
Ligia Barcellos, Christopher K. Pham, Gui Menezes, Raul Bettencourt, Nieta Rocha, Miguel Carvalho, Helena P. Felgueiras
Summary: The invasive species Rugulopteryx okamurae, a brown macroalgae, has been found in European waters and the Strait of Gibraltar. Its proliferation poses significant threats to local ecosystems and results in a socioeconomic burden due to the accumulation of biomass as waste. Researchers have explored using the algae biomass in value-added products or technologies to minimize its impact. This review highlights the potential uses of R. okamurae, such as biogas production, composting, bioplastic, and pharmaceutical purposes.
Editorial Material
Environmental Sciences
Telmo Morato, Pedro Afonso, Gui M. Menezes, Ricardo S. Santos, Monica A. Silva
FRONTIERS IN MARINE SCIENCE
(2020)
Article
Acoustics
Rita Carrico, Monica A. Silva, Manuel Vieira, Pedro Afonso, Gui M. Menezes, Paulo J. Fonseca, Maria Clara P. Amorim
Article
Oceanography
Jason A. Law, Robert H. Weisberg, Yonggang Liu, Dennis A. Mayer, Jeffrey C. Donovan
Summary: Time series data from a moored array of sensors are used to describe the long-term mean circulation and seasonal variations on the West Florida Continental Shelf. The observations reveal a coherent shelf-wide circulation pattern with alongshore and down-coast flow, and a coastal jet separating an upwelling region from a downwelling region influenced by the deeper ocean.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2024)