Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigates the impact of temperature and sea level changes on methane hydrates on the upper continental slope west of Svalbard. Two contrasting hypotheses are tested, and it is concluded that recent ocean warming plays a critical role in hydrate dissociation in this area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Oceanography
Rishav Goyal, Matthew H. England, Martin Jucker, Alex Sen Gupta
Summary: This study highlights the significant impact of zonally asymmetric atmospheric changes on future ocean warming and circulation changes in subtropical western boundary current regions, explaining a substantial portion of sea surface temperature warming in the Tasman Sea, southern Australia, and the Agulhas Current region. The warming trends in the Indian and Pacific basins are primarily driven by the advection of warm tropical water towards the mid-latitudes due to changes in large-scale subtropical ocean gyres, influenced by changes in mid-latitude surface wind stress patterns.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigated the mechanisms by which the stability of methane hydrates at the UCS off west Svalbard is influenced by changes in bottom water temperature and sea level. The simulation results suggest that long-term sea level fall will progressively decrease the hydrate stability zone, while a sudden rise in bottom water temperature increases the likelihood of hydrate dissociation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Environmental Sciences
Jiangong Wei, Tingting Wu, Xiguang Deng, Syed Waseem Haider, Sanober Kahkashan, Shengxiong Yang
Summary: Seafloor methane emissions have significant impacts on global climate change and ocean acidification, but systematic knowledge of submarine methane seepage is lacking. A recent geological survey on the Makran continental margin detected numerous gas flares, with methane flux accounting for a small percentage of global emissions. Methane flares disappeared in the water column, indicating oxidation or dissolution by seawater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Energy & Fuels
S. Y. Misyura, I. G. Donskoy, A. Y. Manakov, V. S. Morozov, P. A. Strizhak, S. S. Skiba, A. K. Sagidullin
Summary: To date, there are no reliable and simple calculation models that simulate the kinetics of dissociation at negative temperatures. One of the important problems is to reduce the cost of storage and transportation of natural gas hydrates. The paper presents experimental data on the effect of layer thickness and temperature on the dissociation kinetics, as well as the effect of the external air velocity.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Oceanography
Yu Hong, Ying Zhang, Yan Du
Summary: The Southern Ocean is an important region for absorbing and storing anthropogenic heat. This study focuses on the south Indian Ocean and finds distinct warming minimum/cooling and freshening in the subtropical ocean thermocline. The freshening anomaly is advected to the north and subducted into the ocean interior, leading to fresher, deeper, and cooler isopycnal surfaces. This has implications for the future heat storage in the Southern Ocean.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
Jing Duan, Yuanlong Li, Fan Wang, Aixue Hu, Weiqing Han, Lei Zhang, Pengfei Lin, Nan Rosenbloom, Gerald A. Meehl
Summary: The sea level rise in the subtropical oceans between 35 degrees and 20 degrees S in the Southern Hemisphere is faster than the global average, mainly due to the persistent upward trend of the southern annular mode. Climate models have failed to reproduce this feature accurately, highlighting the need to reduce model biases for reliable regional sea level projections.
JOURNAL OF CLIMATE
(2021)
Article
Geosciences, Multidisciplinary
Kai Kornhuber, Talia Tamarin-Brodsky
Summary: The study reveals that when the equator-to-pole temperature difference is weaker, the propagation speed of summer weather systems slows down, leading to the possibility of hotter summer weather becoming more persistent, which could increase the risk of extreme heat waves.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Environmental
Pengfei Wang, Kehan Li, Jianyu Yang, Jinlong Zhu, Yusheng Zhao, Ying Teng
Summary: This study investigates the dissociation properties of hydrogen-propane hydrates through experiments and simulations, revealing the characteristics of the dissociation process and the impact of different dissociation driving mechanisms on hydrogen release. The results indicate that the release rate of hydrogen from hydrates is higher than that of propane, and propose the concept of recycling hydrate clathrate structure to accelerate hydrogen storage rate.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Zihua Shao, Jintang Wang, Kaihe Lv, Bo Liao, Zonglun Wang, Yujing Bai, Ren Wang, Jinsheng Sun
Summary: A new type of hydrate dissociation inhibitor was studied using both experimental and molecular dynamics methods. The experimental results showed that this zwitterionic compound had an inhibitory effect on hydrate dissociation, and a kinetic model was validated using the experimental data. Molecular dynamics simulations revealed that the charged functional groups improved the interaction between the inhibitor and methane hydrate, and the sulfonate group had a strong hydration ability that affected the distribution of water molecules in the water phase.
Article
Multidisciplinary Sciences
Tiffany A. Shaw, Osamu Miyawakia, Aaron Donohoe
Summary: The Southern Hemisphere has more storms than the Northern Hemisphere due to equal contributions from topography and ocean circulation. Understanding the energy transfer between land and ocean and its effects on future storminess is crucial. The storminess in the Southern Hemisphere is linked to changes in ocean energy transport in the Southern Ocean, while storminess in the Northern Hemisphere has not significantly changed due to opposing oceanic and radiative changes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Rishav Goyal, Alex Sen Gupta, Martin Jucker, Matthew H. England
Summary: The Southern Hemisphere surface westerlies play a significant role in controlling regional climate patterns, ocean circulation, and carbon uptake. Research based on CMIP5, CMIP6, and reanalysis data reveals historical and projected changes in Southern Hemisphere westerly winds, including a reduction in poleward shift and an increase in wind intensity under high emission scenarios.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Vittoria Lauretano, Alan T. Kennedy-Asser, Vera A. Korasidis, Malcolm W. Wallace, Paul J. Valdes, Daniel J. Lunt, Richard D. Pancost, B. David A. Naafs
Summary: The study presents a semi-continuous terrestrial temperature record spanning from the middle Eocene to the early Oligocene, using bacterial molecular fossils preserved in lignites from southeast Australia. Results show a gradual decline in mean annual temperatures in southeast Australia, with a step cooling across the Eocene/Oligocene boundary, likely driven by changes in pCO2. Climate model simulations support these findings, indicating the importance of pCO2 decline in influencing temperatures in southeast Australia during this time period.
Article
Energy & Fuels
Xuan Kou, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Zhao-Yang Chen
Summary: The memory effect of gas hydrate can shorten the induction time of hydrate nucleation, reduce the formation rate, and influence the dissociation behavior by improving the homogeneous distribution of gas hydrate in pores.
Article
Energy & Fuels
Xiao-Yan Li, Xiao-Sen Li, Yi Wang, Yu Zhang, Kun Wan, Hao-Peng Zeng
Summary: The study revealed that hydrate dissociation rates were similar in hydrate simulators of different scales. Normalized dissociation rates can be used to predict hydrate dissociation rates in different simulators.
Article
Geology
Carolina Holz Boffo, Daniel Bayer da Silva, Rafael Manica, Ana Luiza de Oliveira Borges, Adriano Roessler Viana
Summary: The laboratory experiment demonstrated that subsurface flow from a confined aquifer can lead to slope instability and the formation of sediment transfer pathways on subaqueous slopes. Sediment movement on the slope occurred through various mechanisms such as rolling of particles, fluidized flow, grain flow, and slides. The study also found that mass movements started when the injected flow rate exceeded the hydraulic conductivity capacity of the simulated aquifer. The experiment successfully scaled the physical parameters to natural prototypes, and the erosion and deposition patterns resembled those observed in seismic-geomorphology maps and modern deep-sea physiography. This research highlights the potential role of water sapping by confined aquifer flow in slope erosion and the connection between shallow-water and deep-water environments.
Article
Engineering, Environmental
Victor Hugo Jacks Mendes dos Santos, Amela de Medeiros Engelmann, Leticia Marconatto, Luiz Gustavo dos Anjos Borge, Amela de lara Palhano, Adolpho Herbert Augustin, Luiz Frederico Rodrigues, Joao Marcelo Medina Ketzer, Adriana Giongo
Summary: Studies on landfill leachate degradation dynamics have shown that the microbial community profile is a valuable tool for monitoring landfills. However, little is known about the changes in the microbial profile during the leachate attenuation process. This study conducted an exploratory analysis of the microbial community profile in a municipal solid waste leachate treatment system in Brazil, and found that each treatment unit had a specific microbial consortium that adapted to changes in leachate characteristics. The structure of the microbial community was found to be sensitive to leachate composition and could be applied to study solid waste management systems.
Article
Geosciences, Multidisciplinary
Jaime Y. Suarez-Ibarra, Cristiane F. Frozza, Pamela L. Palhano, Sandro M. Petro, Manuel F. G. Weinkauf, Maria A. G. Pivel
Summary: This study examines the relationship between surface productivity and environmental conditions in the deep western South Atlantic. The results show a significant correlation between paleoproductivity proxies and summer insolation. The findings also suggest that productivity is the main cause of seafloor calcium carbonate dissolution.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
Chris D. Clark, Jeremy C. Ely, Richard C. A. Hindmarsh, Sarah Bradley, Adam Igneczi, Derek Fabel, Colm O. Cofaigh, Richard C. Chiverrell, James Scourse, Sara Benetti, Tom Bradwell, David J. A. Evans, David H. Roberts, Matt Burke, S. Louise Callard, Alicia Medialdea, Margot Saher, David Small, Rachel K. Smedley, Edward Gasson, Lauren Gregoire, Niall Gandy, Anna L. C. Hughes, Colin Ballantyne, Mark D. Bateman, Grant R. Bigg, Jenny Doole, Dayton Dove, Geoff A. T. Duller, Geraint T. H. Jenkins, Stephen L. Livingstone, Stephen McCarron, Steve Moreton, David Pollard, Daniel Praeg, Hans Petter Sejrup, Katrien J. J. Van Landeghem, Peter Wilson
Summary: The BRITICE-CHRONO consortium conducted a dating program to determine the timing of the British-Irish Ice Sheet's advance, maximum extent, and retreat between 31,000 and 15,000 years ago. The study involved extensive field investigations, marine geophysical data collection, and analysis of sediments and stratigraphy. The findings provide valuable insights into the ice sheet's behavior and are crucial for improving ice sheet modeling.
Article
Environmental Sciences
Leticia Osorio da Rosa, Liliane Poleto, Luiz Frederico Rodrigues, Roselei Claudete Fontana, Leticia Isabela Moser, Rosane Maria Lanzer, Ceci Sales Campos, Marli Camassola
Summary: Metals are a major environmental problem due to their toxicity and complexity of removal. This study evaluated the bioaccumulation capacity of fungal isolates to remove water contaminating metals and found that L. crinitus 154L.21 showed promising results in removing metals from industrial effluents, indicating its potential for bioremediation processes.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Geosciences, Multidisciplinary
Kelvin Ikenna Chima, Estelle Leroux, Damien Do Couto, Daniel Praeg, Onyedika Anthony Igbokwe, Miguel Mora-Glukstad, Nick Hoggmascall, Marina Rabineau, Didier Granjeon, Christian Gorini
Summary: This study provides new insights into the relationship between shale mobility and fluid migration in the offshore western Niger Delta. The results suggest that shale tectonics initiated early in the evolution of the region, persisting throughout the Neogene and Quaternary. The presence of mud volcano systems indicates early shale mobilisation in response to overpressure and their potential role as pressure release conduits.
Article
Green & Sustainable Science & Technology
Laura Ferrans, Alexander Nilsson, Frank Schmieder, Divya Pal, Mahboubeh Rahmati-Abkenar, Marcia Marques, William Hogland
Summary: The management of dredged sediments poses challenges as it involves various complex aspects. The EU LIFE SURE project focused on applying sustainable dredging techniques in Sweden while exploring beneficial uses for dredged material. Analysis indicated that soil conditioning was the most environmentally friendly and economically viable option for dredged sediments.
Article
Geosciences, Multidisciplinary
Daniel P. V. Alves, Vittorio Maselli, David Iacopini, Adriano R. Viana, Luigi Jovane
Summary: This study reconstructs the changes in deep-water oceanographic currents in the Equatorial Atlantic Ocean during the Cenozoic by analyzing the evolution of contourite depositional systems and mixed contourite-turbidite systems. The results indicate the establishment and direction inversion of proto-NBC, and the alternation of CDS and mCTS in response to sea level and oceanographic regimes. A six-phase evolutionary model is proposed summarizing the changes in the Brazilian Equatorial Margin. This study contributes to the understanding of the Atlantic Meridional Over-turning Circulation and provides a baseline for future investigations.
Article
Geosciences, Multidisciplinary
Afonso Loureiro, Alexandra Afilhado, Philippe Schnurle, Mikael Evain, Nuno A. Dias, Frauke Klingelhofer, Flora Gallais, Joao Marcelo Pinheiro, Jose Eduardo Soares, Reinhardt Fuck, J. A. Cupertino, Adriano Viana, Carlos Corela, Maryline Moulin, Daniel Aslanian
Summary: During the SALSA experiment in 2014, wide-angle refraction and seismic profiles were acquired in the Jequitinhonha-Almada-Camamu, Jacuipe, and Sergipe-Alagoas basins in NE Brazil. The study found that sediment thickness varies across the profile, with the Camamu basin showing a distinct crustal layer structure. The results suggest that the Almada and Camamu basins contain exhumed continental crust.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Andrea Peuzin, Marianne Saillard, Nicolas Espurt, Francois Michaud, Cedric Bulois, Daniel Praeg, Marc Regnier, Ysabel Calderon
Summary: The offshore Tumbes-Guayaquil forearc basin in Northern Peru-Southern Ecuador exhibits evidence of large-scale gravity-driven deformation systems during the Late Neogene-Quaternary period. The sediments in the basin are detached and decoupled from the underlying accretionary prism systems. This anomalous gravity tectonics can be attributed to a combination of tectonostratigraphic features and overpressured shales.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Renato Borges Bernardes, Jose Eduardo Pereira Soares, Marcus Vinicius Aparecido Gomes de Lima, Reinhardt Adolfo Fuck, Adriano Roessler Viana
Summary: This study conducted a systematic wide-angle reflection and refraction seismic experiment for the crust and uppermost mantle in southeastern Brazil using controlled-source seismology. The obtained two-dimensional P-wave seismic velocity model revealed varying Moho depths (between approximately 31 and 45 km) and crustal thinning towards the continental margin. The modeled velocity structure provided new insights into the lithospheric morphology of the region, particularly within the lower crust and uppermost mantle. The findings suggested pervasive intrusion due to magmatic underplating in certain areas, while delamination may have caused thinner crust and lower velocity in the uppermost mantle near the continental margin.
Article
Multidisciplinary Sciences
M. Ketzer, D. Praeg, A. H. Augustin, L. F. Rodrigues, A. K. Steiger, M. Rahmati-Abkenar, A. R. Viana, D. J. Miller, A. Malinverno, G. R. Dickens, J. A. Cupertino
Summary: Seafloor methane emissions, caused by the release of methane from gas hydrate and free gas through the collapse of sediment accumulations on continental slopes, have significant effects on Earth's climate and ocean chemistry. This study highlights the importance of collapsing sediment accumulations as pathways for gas migration, resulting in seafloor emissions. The observed emissions in the study region are three times greater than estimates for the entire US North Atlantic margin, indicating the significance of collapsing sediment accumulations for ocean carbon cycling. Similar outgassing systems exist on other sediment-laden continental slopes.
SCIENTIFIC REPORTS
(2023)
Article
Geosciences, Multidisciplinary
Louison Mercier, Sebastien Migeon, Massimo Dall'Asta, Daniel Praeg, Jean-Loup Rubino, Vincent Delhaye-Prat, Francois Lafont, Tony Akpi
Summary: Submarine canyons play a crucial role in the formation and growth of continental margin depocentres. The formation of canyons is influenced by both ocean currents and erosion. The study on the eastern Niger Delta reveals that the formation and enlargement of canyons are related to extensional tectonic structures such as growth-faults. The morphology of the buried canyon system is shaped by various factors including sea-level change, ocean currents, and tectonic activity.
Article
Ecology
Jaime Y. Suarez-Ibarra, Tiago M. Freire, Cristiane F. Frozza, Taina M. L. Pinho, Sandro M. Petro, Bruna B. Dias, Thomas B. Chalk, Sonia Chaabane, Medhavi Srivastava, Karen B. Costa, Felipe A. L. Toledo, Thibault de Garidel-Thoron, Joao C. Coimbra, Maria A. G. Pivel
Summary: This study reconstructs past changes in the marine environment and analyzes the mechanisms behind them, proposing two mechanisms for glacial inception and highlighting the interactions between these mechanisms.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Chemistry, Analytical
J. P. Souza, J. L. Boff, L. F. Rodrigues, D. P. Moraes, J. S. F. Pereira
Summary: This study developed a microwave-induced combustion (MIC) method for complete digestion of petroleum coke samples and quantitative determination of elements. Satisfactory results were obtained using a dilute acid solution and the method was simpler and compatible with ICP OES measurements compared to the ASTM D 5600 method.
ANALYTICAL METHODS
(2022)
