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
Environmental Sciences
Eoghan Daly, Martin White
Summary: Bottom trawling noise was quantified impacting marine acoustic habitats, showing significantly louder noise levels during trawling activities than ambient and nearby vessel noise, potentially causing harm to cetaceans. Submarine canyon topography may enhance noise propagation, with trawling gear-generated noise being a pollution source requiring further attention in areas of heightened ecological susceptibility.
MARINE POLLUTION BULLETIN
(2021)
Article
Oceanography
Jill R. Bourque, Amanda W. J. Demopoulos, Craig M. Robertson, Furu Mienis
Summary: The study found that there is higher diversity in sediment communities adjacent to hard substrate habitats and along the axis of submarine canyons. The abundance and diversity of hard substrate adjacent sediment communities did not change with depth, mainly influenced by sediments with low organic matter content, while canyon and slope community assemblages were affected by depth and higher organic content.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Mechanics
Zhuangcai Tian, Yonggang Jia, Jiangxin Chen, J. Paul Liu, Shaotong Zhang, Chunsheng Ji, Xiaolei Liu, Hongxian Shan, Xuefa Shi, Jiwei Tian
Summary: The study reveals that internal solitary waves (ISWs) in deep sea (>1000 m) can cause sediment resuspension and seafloor geomorphic changes, with a maximum resuspension depth of 1500 m. ISWs have a greater impact on water depths less than or similar to 1000 m, shaping the seabed and controlling sediment distribution patterns on the Dongsha continental slope.
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)
Article
Marine & Freshwater Biology
Joshua Nitschke, Ian Knuckey, Matt Koopman, Russell Hudson, Charlie Huveneers, Gretchen Grammer, Tim M. Ward
Summary: This study examined the spatial and temporal variations in demersal fish assemblage in the central Great Australian Bight and found that the composition and abundance of the assemblage are influenced by both fishing and environmental gradients. Recent declines in the abundance indices of target species highlight the need for continued fishery-independent monitoring. The relative importance of fishing pressure, environmental variability, and other human activities in driving these changes warrant further investigation.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Environmental Sciences
Gavin Breyer, Alexander Bartholomae, Roland Pesch
Summary: The automatic calculation of sediment maps from hydroacoustic data is crucial for habitat and sediment mapping, but there is a lack of comparative studies on different approaches. This study recommends suitable methods for classifying side-scan sonar data based on performance evaluation using machine-learning and deep learning techniques.
Article
Environmental Studies
Alexandre Pereira da Silva
Summary: This article discusses the potential establishment of a marine protected area covering the entire Vitoria-Trindade Chain in Brazil, arguing that the chain is actually within national jurisdiction and therefore there is legal and political scope to create a comprehensive MPA.
Article
Geosciences, Multidisciplinary
Fukang Qi, Zhiqiang Liu, Jingping Xu
Summary: Bottom drag coefficient is an important parameter in quantifying shelf hydrodynamics and sediment transport processes. This study investigates the variations in bottom drag by using in situ measurements. The results show a tidal asymmetry of bottom drag, possibly caused by changes in local bed roughness. The computed values of bottom drag coefficient decrease with increasing Reynolds number for hydrodynamically smooth flows, while for rough or transitional flows, the drag coefficient remains constant. The averaged drag coefficient over all observation periods is 1.7 x 10(-3). Smaller waves have limited impact on the bottom drag coefficient, but wave-current interactions can increase the drag coefficient.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Deniz Cukur, Gee-Soo Kong, David M. Buchs, Gwang-Soo Lee, Seong-Pil Kim, In-Kwon Um, Jong-Hwa Chun, Byoung-Yeop Kim, Ji Eun Seo, Hyun Sook Chae, Senay Horozal
Summary: A new sand wave field was discovered in the outer shelf of the southeastern continental margin of the Korean Peninsula, consisting of two types of sand waves. The sediment forming the waves is a mixture of siliciclastic and carbonate materials, controlled by changes in hydrodynamic conditions.
Article
Meteorology & Atmospheric Sciences
Peida Han, Xiping Yu
Summary: It has been found that Hurricane Irene generated strong near-inertial currents in the Mid-Atlantic Bight region of the US East Coast in late August 2011. The study used a combination of field data and model results to investigate the development and decay mechanism of this event. The results showed that the near-inertial currents were significant in most areas of the region, except in the nearshore area where the hurricane-induced strong mixing destroyed the stratification. It was also revealed that the near-inertial kinetic energy was mainly gained from wind power during the hurricane event.
Article
Geosciences, Multidisciplinary
D. Ellerton, T. M. Rittenour, J. Shulmeister, A. P. Roberts, G. Miot da Silva, A. Gontz, P. A. Hesp, P. Moss, N. Patton, T. Santini, K. Welsh, X. Zhao
Summary: This study used optically stimulated luminescence and palaeomagnetic dating to determine the age of Fraser Island and the adjacent Cooloola Sand Mass. The results showed that they formed between 1.2 Ma and 0.7 Ma, during a global climate reconfiguration. The formation of Fraser Island reduced sediment supply and facilitated the development of the Great Barrier Reef.
Review
Oceanography
Weifeng (Gordon) Zhang, Zhen Cheng, Andrew D. Ashton
Summary: The study investigates the topographic influence of internal tides at the shelf edge, finding that a combination of tides and locally generated internal tides can mobilize sediment. Model results suggest that internal tides may have a certain impact on topographic changes, with the upper bound of seafloor change over 10,000 years being 1-2 meters under the considered parameter range.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Oceanography
Paulo Victor Lisboa, Elisa H. Fernandes, Aldo Sottolichio, Nicolas Huybrechts, Antonio Raylton Rodrigues Bendo, Juliana Costi
Summary: This study aims to improve the understanding of sediment transport and depositional processes in the Southwest Atlantic Inner Shelf. The analysis of an 8-year period revealed that deposition mostly exceeded erosion in the south of the Patos Lagoon mouth and resulted in positive bottom evolution, while erosion exceeded deposition to the north of the mouth, resulting in negative bottom evolution. The study also found that fluvial discharge and wind action influenced the variability of depositional processes, and ENSO events had pronounced effects on deposition off Rio de la Plata.
CONTINENTAL SHELF RESEARCH
(2023)
Article
Environmental Studies
Alexandre Pereira da Silva
Summary: The article discusses Brazil's incorporation of the Rio Grande Rise into its continental margin, resulting in an increase in its outer continental shelf area. This move also impacts marine resource exploration and benefit-sharing.