Article
Geography, Physical
Vladimir Karpin, Atko Heinsalu, Antti E. K. Ojala, Joonas J. Virtasalo
Summary: Glacial landforms provide valuable information on past ice sheet dynamics. Murtoos are triangular-shaped subglacial landforms associated with meltwater activity. In the northern Gulf of Riga, offshore murtoos and associated eskers were found, which differed in size and alignment compared to those on land. The formation of these landforms was attributed to the Bolling warming period.
Article
Engineering, Marine
Wei Xu, Heqin Cheng, Shuwei Zheng, Hao Hu
Summary: The predictive mapping of seabed sediments using multibeam data and random forest decision tree is effective in mapping the distribution and properties of sediments. There are opposite non-linear correlations between sediment properties and multibeam data that require further investigation.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Ben Callow, Jonathan M. Bull, Giuseppe Provenzano, Christoph Bottner, Hamza Birinci, Adam H. Robinson, Timothy J. Henstock, Timothy A. Minshull, Gaye Bayrakci, Anna Lichtschlag, Ben Roche, Naima Yilo, Romina Gehrmann, Jens Karstens, Ismael H. Falcon-Suarez, Christian Berndt
Summary: The study integrates high-resolution seismic reflection data with sediment core data to characterize an active methane venting site called the Scanner pockmark complex in the UK North Sea. Direct evidence of active and palaeo-fluid migration pathways terminating at seabed pockmarks was presented, with pockmarks fed by a methane gas reservoir located 70 m below the seafloor. Shallow reservoir formation is controlled by the shallow geological and glaciogenic setting, with pockmarks acting as drainage cells for underlying gas accumulations. Fluid flow occurs through gas chimneys, comprised of a sub-vertical gas-filled fracture zone.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geology
Song Zhu, Xuejie Li, Huodai Zhang, Zhibin Sha, Zhen Sun
Summary: The characteristics, distribution, and genesis of pockmarks in the South China Sea are explored based on high-resolution multibeam bathymetric data and multichannel seismic profiles. Pockmarks in the area vary in shape, size, and depth, likely originating from methane seepages or pore fluids migrating vertically along geological structures. Bottom currents also play a role in shaping pockmark morphologies.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Giuliana Andrea Diaz-Mendoza, Knut Kraemer, Gitta Ann von Roenn, Klaus Schwarzer, Christoph Heinrich, Hans-Christian Reimers, Christian Winter
Summary: Hydroacoustic observations of shallow marine environments have identified a variety of circular seafloor structures, both natural and anthropogenic. This study analyzed over 3,000 circular features in the southwestern Baltic Sea, using side-scan sonar, multibeam echosounder, and sub-bottom profiler data. The structures were classified into six categories based on their sedimentology, morphology, and acoustic signatures. The results provide insights into the formation mechanisms of these features, but further investigations are needed to fully understand the origin of some of them.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Parker Liautaud, Peter Huybers
Summary: Despite recent advances in empirical and modeling studies, uncertainties remain regarding atmospheric CO2 concentrations during the early Pleistocene. Using a Bayesian paleoclimate model, it was inferred that CO2 concentrations averaged 241 ppm between 2 and 0.8 Ma. Uncertainty estimates accounted for various factors including orbital forcing and age uncertainties.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Takeshige Ishiwa, Yusuke Yokoyama, Stephen Obrochta, Katsuto Uehara, Jun'ichi Okuno, Minoru Ikehara, Yosuke Miyairi
Summary: This study presents radiocarbon dating conducted in the Bonaparte Gulf in northwestern Australia, showing significant influence of sea level changes on past depositional environment, and differing reliability of carbonate fossils and acid-insoluble carbon at different sea levels.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Acoustics
Qiuhua Tang, Xiaoyu Liu, Xue Ji, Jie Li, Yilan Chen, Bo Lu
Summary: This study investigates a large-scale pockmark group in the North Yellow Sea shallow sea sedimentary plain, analyzing seabed texture features, developing a statistical model linking seabed backscatter sonar strength and sediment grain-size characteristics, and using an improved BP neural network for rapid classification and identification of seabed sediment types. The findings provide insights into the surface textures and local distribution laws of seabed sediments, laying the foundation for further research on the formation and evolution of seabed pockmarks.
Article
Oceanography
T. Luedmann, Y. M. Saitz, J. Metzing, K. -C. Emeis
Summary: This study investigated the physical impact of demersal fishing in three different areas of the German North Sea sector using a multibeam echosounder. It found that different fishing gears have different effects on seafloor structures and properties, with beam trawling exhibiting the greatest impact.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
E. A. Moroz, E. A. Eremenko, A. P. Denisova, A. D. Mutovkin, R. A. Ananiev
Summary: Detailed geological and geomorphological studies in the Pechora Sea revealed the presence of numerous gas funnels at the bottom of the Southern Novaya Zemlya Trench. These landforms, formed by gas escaping into the water column, are widespread in the Barents Sea but have limited information on their distribution in the Pechora shelf.
DOKLADY EARTH SCIENCES
(2023)
Article
Environmental Sciences
Liangming Hu, Yi Zhang, Yizhuo Wang, Pengyun Ma, Wendong Wu, Qian Ge, Yeping Bian, Xibin Han
Summary: The paleoproductivity in the Southern Ocean plays a crucial role in controlling the atmospheric CO2 concentration. The sediment record from the Cosmonaut Sea reveals the correlation between oxygen concentration in the bottom water and atmospheric CO2 fluctuations since the Last Glacial Maximum (LGM). The change in export production helps reconstruct the evolution history of deep-water ventilation/upwelling, showing the storage of carbon and low oxygen concentration during the LGM, release of CO2 during the Last Deglaciation, and increased productivity and oxygen consumption during the Holocene.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geography, Physical
A. Baril, E. Garrett, G. A. Milne, W. R. Gehrels, J. T. Kelley
Summary: RSL reconstructions from paleo records are crucial for testing GIA models, but some regions, like Maine, USA, have large and rapid changes that current models fail to capture. This study presents a revised pre-10 ka RSL database for Maine and shows that the extreme variations in RSL are robust. However, none of the tested GIA models produce a good fit to the data, suggesting that Earth models with time-dependent viscosity might be needed to explain the Maine RSL data.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Green & Sustainable Science & Technology
Christiana Dietzen, Minik T. Rosing
Summary: The application of ground silicate minerals or glacial rock flour to agricultural soils can enhance the weathering rate of these materials, thus increasing CO2 uptake. However, there is a need for simple and inexpensive methods for determining the amount of CO2 uptake and accounting for the impact of non-carbonic acids. In this study, a protocol is presented to correct estimates of CO2 uptake in soils with a pH below 6.3 by considering weathering by non-carbonic soil acids. The estimated CO2 uptake after applying 50 tons of Greenlandic glacial rock flour to an acidic, sandy soil in Denmark over 3 years was 728 kg CO2 ha-1.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Ecology
Martha L. Vargas-Terminel, Julio C. Rodriguez, Enrico A. Yepez, Carlos A. Robles-Zazueta, Christopher Watts, Jaime Garatuza-Payan, Rodrigo Vargas, Zulia M. Sanchez-Mejia
Summary: This study finds that anthropogenic activities can significantly impact the carbon sink potential of mangrove wetlands, as observed in two sites in northwest Mexico.
JOURNAL OF ARID ENVIRONMENTS
(2023)
Article
Geosciences, Multidisciplinary
Guido Vettoretti, Peter Ditlevsen, Markus Jochum, Sune Olander Rasmussen
Summary: The study demonstrates that nonlinear self-sustained climate oscillations can appear spontaneously within specific glacial-level atmospheric CO2 concentrations, with CO2 playing a key role in controlling the relative rates of internal forcing and feedback in the system. These oscillations exist in the Earth system and may be influenced by internal climate variability and external noise-induced transitions.
Article
Geosciences, Multidisciplinary
P. de Caritat, E. N. Bastrakov, S. Jaireth, P. M. English, J. D. A. Clarke, T. P. Mernagh, A. S. Wygralak, H. E. Dulfer, J. Trafford
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2019)
Article
Multidisciplinary Sciences
W. A. Nicholas, Terry Lachlan, Colin Murray-Wallace, Gilbert J. Price
TRANSACTIONS OF THE ROYAL SOCIETY OF SOUTH AUSTRALIA
(2019)
Article
Geosciences, Multidisciplinary
A. L. Post, P. E. O'Brien, S. Edwards, A. G. Carroll, K. Malakoff, L. K. Armand
Article
Environmental Sciences
Steven J. Dalton, Andrew G. Carroll, Eugenia Sampayo, George Roff, Peter L. Harrison, Kristina Entwistle, Zhi Huang, Anya Salih, Sandra L. Diamond
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Geography, Physical
Helen E. Dulfer, Martin Margold, Zbynek Engel, Regis Braucher, Georges Aumaitre, Didier Bouries, Karim Keddadouche
Summary: Utilizing in situ produced cosmogenic dating reveals that Mount Spieker became ice free before the Bolling warming, while Mount Morfee remained in contact with the Cordilleran Ice Sheet until the Younger Dryas.
QUATERNARY RESEARCH
(2021)
Article
Geography, Physical
Colin Murray-Wallace, John H. Cann, Yusuke Yokoyama, William A. Nicholas, Terry J. Lachlan, Tsun-You Pan, Anthony Dosseto, Antonio P. Belperio, Victor A. Gostin
Summary: This study focuses on accurately defining palaeosea-levels during Late Pleistocene interstadials, using sediment records from a stable, remote far-field setting in southern Australia. Analysis of amino acid racemization in foraminifer Elphidium macelliforme shows correlation with Marine Isotope Stages, highlighting its utility in geochronology. Foraminiferal faunal assemblages indicate millennial-scale sea level variability, consistent with records from other regions, suggesting Sub-Milankovitch interstadial sea level variability noted in ice cores.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography
Helen E. Dulfer, Martin Margold
Summary: The study focuses on the glacial history of the central sector of the Cordilleran Ice Sheet in northern British Columbia, using improved resolution of remotely sensed data to map various glacial landforms. The mapped landforms provide insights into the extent, thickness, behavior, movement direction, and retreat pattern of the ice sheet.
Article
Geosciences, Multidisciplinary
Alexandra L. Post, Rachel Przeslawski, Rachel Nanson, Justy Siwabessy, Deborah Smith, Lisa A. Kirkendale, Nerida G. Wilson
Summary: Repeat multibeam mapping of two slope-confined canyons on the northwest Australian margin revealed ongoing processes such as active sliding, deepening depressions, and the role of turbidity currents in shaping the canyon morphology. The presence of intact seagrass blades suggests transportation of material from the adjacent continental shelf into these canyon systems.
Article
Geography, Physical
Helen E. Dulfer, Martin Margold, Christopher M. Darvill, Arjen P. Stroeven
Summary: The study investigates the dynamics of the Cordilleran Ice Sheet (CIS) in northern British Columbia, Canada during the Last Glacial Maximum (LGM) and its subsequent retreat. By analyzing glacial landforms, the research identifies three stages of ice flow and reveals complex changes in ice dynamics over time. The study also provides insights into the post-LGM ice retreat and the re-growth of independent mountain glaciers in the Late Glacial period.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Biodiversity Conservation
Tom C. L. Bridge, Zhi Huang, Rachel Przeslawski, Maggie Tran, Justy Siwabessy, Kim Picard, April E. Reside, Murray Logan, Scott L. Nichol, M. Julian Caley
CONSERVATION SCIENCE AND PRACTICE
(2020)
Review
Environmental Sciences
Anne-Cathrin Woelfl, Helen Snaith, Sam Amirebrahimi, Cohn W. Devey, Boris Dorschel, Vicki Ferrini, Veerle A. Huvenne, Martin Jakobsson, Jennifer Jencks, Gordon Johnston, Geoffroy Lamarche, Larry Mayer, David Millar, Terje Haga Pedersen, Kim Picard, Anja Reitz, Thierry Schmitt, Martin Visbeck, Pauline Weatherall, Rochelle Wigley
FRONTIERS IN MARINE SCIENCE
(2019)
Article
Geosciences, Multidisciplinary
Jin Li, Justy Siwabessy, Zhi Huang, Scott Nichol
Article
Environmental Sciences
Rachel Przeslawski, Scott Foster, Jacquomo Monk, Neville Barrett, Phil Bouchet, Andrew Carroll, Tim Langlois, Vanessa Lucieer, Joel Williams, Nicholas Bax
FRONTIERS IN MARINE SCIENCE
(2019)
Article
Fisheries
Michelle Linklater, Alan R. Jordan, Andrew G. Carroll, Joseph Neilson, Sallyann Gudge, Brendan P. Brooke, Scott L. Nichol, Sarah M. Hamylton, Colin D. Woodroffe
MARINE AND FRESHWATER RESEARCH
(2019)
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)