Article
Water Resources
Bent Hasholt, Troels F. Nielsen, Kenneth D. Mankoff, Vasileios Gkinis, Irina Overeem
Summary: Glaciers erode their beds and adjacent landscape by abrasion and entrain sediment as they move downwards. The ice in glaciers becomes a vehicle for sediment transport. To determine the sediment transport of glaciers, it is necessary to measure the ice flux and concentration of sediment. This study describes a method to systematically collect ice samples from icebergs in Greenland and presents estimates of sediment transport related to calving.
HYDROLOGICAL PROCESSES
(2022)
Article
Geosciences, Multidisciplinary
Kevin Zoller, Jan Sverre Laberg, Tom Arne Rydningen, Katrine Husum, Matthias Forwick
Summary: This study aims to enhance our understanding of ice dynamics of the Greenland Ice Sheet (GrIS) in a fjord and inner shelf environment and provide a palaeoenvironmental reconstruction of southwestern Dove Bugt and Bessel Fjord since the Last Glacial Maximum (LGM). The findings suggest that the GrIS likely experienced multiple halts or readvances during deglaciation and retreated from the marine realm in the Early Holocene. Moreover, the ice caps in Bessel Fjord may have fluctuated with greater sensitivity to climatic conditions than the northeastern sector of the GrIS in the Late Holocene.
CLIMATE OF THE PAST
(2023)
Article
Geosciences, Multidisciplinary
Federica Donda, Roberto Romeo, German Leitchenkov, Davide Gei, Yair Rosenthal, Amy Leventer, Emanuele Lodolo, Taryn L. Noble, Alexandra Post, Philip E. O'Brien, Bradley N. Opdyke, Elisabetta Olivo
Summary: Understanding the Antarctic Ice Sheet's response to past climate warming is crucial for comprehending its role in current and future climate change. Through seismic stratigraphic analysis, it has been found that sediments deposited on the Sabrina Coast retain a well-preserved record of glacial and oceanographic dynamics. This area has the potential for deep ocean drilling, which will provide important insights into the dynamics of the marine-based ice sheet and its sensitivity to climate change.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
G. Luetzenburg, D. Townsend, K. Svennevig, M. Bendixen, A. A. Bjork, E. F. Eidam, A. Kroon
Summary: Climate change will increase erosion rates along the Arctic coast by increasing the duration of sea-ice-free periods and shifting precipitation patterns. This study focuses on a 3-km sedimentary cliff section on the south coast of Qeqertarsuaq, Greenland, and measures 2D cliff top erosion over 50 years and 3D cliff profile change over 2 years. The findings show that erosion of soft coastal cliffs in Greenland can accelerate due to increased storminess and prolonged open water periods in a continuously warming climate.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Geography, Physical
Melody Biette, Vincent Jomelli, Marie Chenet, Regis Braucher, Laurie Menviel, Didier Swingedouw, Vincent Rinterknecht
Summary: This study presents Be-10 cosmic-ray exposure ages of mountain glacier moraines in southeastern and southern Greenland, documenting glacier fluctuations during the Late Holocene for the first time in these areas. The research reveals multiple glacier advances during the Late Holocene, with common timing of the largest glacier expansion. The study suggests the significant glacial advance at around 3 ka in southern and southeastern Greenland could be attributed to a combination of stronger East Greenland Current, weaker Irminger Current, and increased sea-ice concentration during the Late Holocene.
Article
Biodiversity Conservation
Margrete Emblemsvag, Laurene Pecuchet, Liv Guri Velle, Adriana Nogueira, Raul Primicerio
Summary: This study assessed the temporal trends in functional diversity of deep-sea demersal fish communities in East Greenland, aiming to characterize ecological responses to rising sea temperatures. The findings revealed a decrease in functional diversity, associated with taxonomic and functional borealization, down to 1000 m, indicating an increase in mobile generalists and a decrease in bottom dwelling benthivores. The decline in functional diversity may have a negative impact on ecosystem resilience to environmental change. These responses are likely not limited to the study area and highlight the need for greater attention to ecosystem considerations in deep-sea climate change management strategies.
DIVERSITY AND DISTRIBUTIONS
(2022)
Article
Geosciences, Multidisciplinary
Eric A. Barefoot, Jeffrey A. Nittrouer, Kyle M. Straub
Summary: An appealing strategy for reconstructing paleoenvironmental change is to linearly interpolate between marker beds of known age. However, changes in sedimentary processes can invalidate this method and affect estimates of time from the strata. When sedimentary processes change, measuring time linearly systematically overestimates time duration and misestimates the beginning and end of geologic intervals. Geologic evidence for changes in sediment dispersal can help identify sections of dilated and shifted time, and better resolve time in sedimentary strata.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Liliana Betancurth, Julio Canon
Summary: The study investigates modern sedimentation in the Atrato River Delta through analyzing sediment samples for grain size, mineral abundances, chemical weathering, and concentrations of major and trace elements. The results indicate a decreasing sediment size pattern towards the bays, with varying transport regimes and a dominance of quartz in mineralogy. High concentrations of oxides suggest oxidation processes with moderate to high weathering.
Article
Geosciences, Multidisciplinary
Xiaoxia Huang, Shiguo Wu, Laura De Santis, Guolong Wang, F. Javier Hernandez-Molina
Summary: The thick sequence of mid-late Cenozoic sediments preserved within the Enderby Basin of the East Antarctica margin contains key information regarding glacial history and paleo-oceanographic conditions during the last 34 My. The interplay between glacial processes and ocean circulation can be reconstructed from seismic stratigraphic studies.
Article
Geography, Physical
Tine L. Rasmussen, Christof Pearce, Katrine Juul Andresen, Tove Nielsen, Marit-Solveig Seidenkrantz
Summary: This study provides insights into the size of the last glacial ice sheet on the Northeast Greenland shelf and its interaction with ocean circulation. The results suggest that the site was affected by a strong flow of warm Atlantic Water during the Last Glacial Maximum, while conditions turned more polar with cold bottom water flow in the Holocene. The data also show evidence of iceberg scouring and indicate that the Greenland Ice Sheet did not extend to the edge of the NE Greenland shelf during the Last Glacial Maximum.
Article
Environmental Sciences
Yu Liu, Jianhui Wang, Guoqing Han, Xiayan Lin, Guijing Yang, Qiyan Ji
Summary: The East Greenland Polar Front (EGPF) is an important front in the Nordic Seas, and its variations are closely linked to sea ice melting and North Atlantic water recirculation. Analysis using global ocean reanalysis data reveals that the intensity and area of EGPF show significant seasonal and interannual variations, with an increasing trend in recent years.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Elza J. M. Dugamin, Michel Cathelineau, Marie-Christine Boiron, Antonin Richard, Frank Despinois
Summary: Reservoirs in sedimentary basins exploited for oil, gas, or geothermal energy have the potential to be an alternative lithium resource. Factors affecting lithium concentrations include mixing processes, fluid-rock interactions, and temperature rise. Favorable reservoirs for lithium-rich brines are characterized by certain geological features and must be protected from dilution and lithium depletion.
Article
Environmental Sciences
Wanpeng Jiang, Qianqian Chen, Liqiang Xu
Summary: Through analyzing a piston core collected from Chaohu Lake in east China, the sedimentary history of silver (Ag) was examined, revealing significant changes and suggesting human activity as the driving factor for its distribution.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Oceanography
E. Duyck, M. F. De Jong
Summary: Increasing freshwater fluxes from the Greenland ice sheet and the Arctic to the Subpolar North Atlantic could affect the overturning circulation. The pathways of freshwater from the Greenland shelf to interior seas and deep convection regions are not well understood. This study investigates freshwater exchange processes using drifter data and satellite measurements, finding limited and intermittent export over the east Greenland shelf, but potential enhancement of mixing near the shelf.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Geosciences, Multidisciplinary
Majken D. Poulsen, Nynke Keulen, Vincent J. van Hinsberg, Jochen Kolb, Robert Frei, Tonny B. Thomsen
Summary: Plumasite-type corundum occurrences in the Nattivit area in South-East Greenland provide a unique opportunity to study corundum formation in-situ. New field observations and analysis of elemental and isotopic geochemistry shed light on the history of crustal convergence, exhumation, and corundum formation.
PRECAMBRIAN RESEARCH
(2023)
