Article
Geosciences, Multidisciplinary
J. K. Andersen, N. Rathmann, C. S. Hvidberg, A. Grinsted, A. Kusk, J. P. Merryman Boncori, J. Mouginot
Summary: Subglacial hydrology has a significant impact on ice flow through its effect on friction at the ice-bedrock interface. Using DInSAR technology, a series of subglacial drainage events were observed along the Northeast Greenland Ice Stream (NEGIS) starting as far inland as 500 km from the margin of Zachariae Isstrom. These events were associated with local transient uplift, followed by prolonged subsidence, and temporary acceleration in ice flow downstream. The high spatiotemporal resolution of DInSAR measurements allowed for detailed mapping of the drainage propagation pathway, revealing multiple drainage cascades along the same pathway between 2020 and 2022. The propagation speed of subglacial water flow varied greatly along NEGIS, suggesting fundamental differences in the subglacial environment.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Sam Anderson, Valentina Radic
Summary: Heatwaves not only have wide-ranging impacts on various aspects, including human health and agriculture, but also control streamflow through the melting of snow and glacier ice. This study uses a deep learning hydrological model to simulate the streamflow response to heatwaves in southwestern Canada and finds that glaciers can buffer the impacts of heatwaves on streamflow.
WATER RESOURCES RESEARCH
(2023)
Article
Geography, Physical
Darrel A. Swift, Guy D. Tallentire, Daniel Farinotti, Simon J. Cook, William J. Higson, Robert G. Bryant
Summary: The study conducted at Findelengletscher in Switzerland shows that the hydraulic efficiency of drainage pathways in the glacier terminus region is poor, but sediment availability is high. The rate of increase in sediment concentration with discharge was found to be significantly lower than expected, indicating a dominance of distributed flow and high sediment connectivity between the glacier and proglacial realm. This results in an unusually high daily sediment yield compared to similar Alpine glaciers.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Geosciences, Multidisciplinary
Celeste R. Labedz, Timothy C. Bartholomaus, Jason M. Amundson, Florent Gimbert, Marianne S. Karplus, Victor C. Tsai, Stephen A. Veitch
Summary: Understanding the dynamic response of glaciers to climate change is crucial for assessing water resources and hazards. Subglacial hydrology is a key player in glacier systems, and traditional observations of it are limited. Recent seismic deployments have shown the potential for comprehensive observation of glacial hydrologic systems. This study used a high-density seismic deployment to observe glaciohydraulic tremor on the Lemon Creek Glacier surface, coinciding with a marginal lake drainage event.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geography, Physical
Joni Makinen, Kari Kajuutti, Antti E. K. Ojala, Elina Ahokangas, Aleksi Tuunainen, Markus Valkama, Jukka-Pekka Palmu
Summary: The purpose of this paper is to describe the structure and composition of subglacial landforms called murtoos in order to understand their formation and depositional environment. Murtoos have been found in Finland and Sweden and are likely to exist in all areas covered by past ice sheets. They occur in fields along subglacial meltwater routes and are composed of sandy and gravelly sediments interbedded with sorted sediments. Murtoos were formed by sediment-concentrated flows during weak glaciotectonic deformation, indicating near-zero pressure.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Samuel J. Cook, Poul Christoffersen, Joe Todd
Summary: A fully coupled 3D full-Stokes model was applied to simulate Store Glacier in west Greenland, revealing differences in subglacial hydrology between high melt year 2012 and low melt year 2017. Hydrodynamic feedbacks were found to have significant impacts on channel growth and calving at the glacier terminus.
JOURNAL OF GLACIOLOGY
(2022)
Article
Geochemistry & Geophysics
Adrian Mellage, Gal Zakai, Bar Efrati, Holger Pagel, Nimrod Schwartz
Summary: This study utilizes the geophysical method spectral induced polarization (SIP) to monitor the capacity of soils to immobilize sorbing contaminants. Results show that without solid organic matter (SOM) amendment, soil polarization decreases with increasing sorbed contaminants, exhibiting a leveling-off behavior. The addition of SOM increases the soil conductivity and modifies the dependence between conductivity and sorbed contaminants. The time constant derived from the Cole-Cole model indicates a saturation-type dependence governed by a drop in ion mobility with increasing sorption.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geography, Physical
Ken Kondo, Shin Sugiyama, Daiki Sakakibara, Shungo Fukumoto
Summary: Due to climate warming, glacial meltwater discharge in Greenland has been increasing, with peak discharge reaching 19.9m³/s in recent years. A numerical model revealed a nonlinear increase in glacial melt with rising temperatures under warming conditions.
JOURNAL OF GLACIOLOGY
(2021)
Article
Geochemistry & Geophysics
U. Meyer, M. Lasser, C. Dahle, C. Foerste, S. Behzadpour, I Koch, A. Jaeggi
Summary: The Combination Service for Time-variable Gravity fields (COST-G) operationally provides combinations of monthly Earth gravity field models derived from observations of the GRACE Follow-on (GRACE-FO) satellite mission. The combination has been further developed and extended to meet user requirements and achieve optimal signal-to-noise ratio. The quality of the combined gravity fields is assessed by noise content comparison and signal-to-noise ratio comparison with individual time-series.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Environmental Sciences
M. S. Pleasants, F. dos A. Neves, A. D. Parsekian, K. M. Befus, T. J. Kelleners
Summary: This study uses synthetic and field-collected, time-lapse ERT data to determine hydraulic parameters of a vertical flow model in mountainous environments. Results show that ERT data can recover hydraulic parameters to a certain extent, but struggle to capture groundwater levels.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Stefan Hofer, Charles Amory, Christoph Kittel, Tim Carlsen, Louis Le Toumelin, Trude Storelvmo
Summary: This study demonstrates that incorporating drifting snow into regional climate models can significantly alter cloud characteristics, surface energy budget, and radiative energy fluxes over Antarctica. Accounting for drifting snow leads to increased cloud cover and a positive change in surface radiative energy budget. The results emphasize the importance of studying drifting snow processes for understanding the future evolution of clouds, surface energy budget, and atmospheric structure over Antarctica.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Iwo Wieczorek, Mateusz C. Strzelecki, Lukasz Stachnik, Jacob C. Yde, Jakub Malecki
Summary: This study provides the first inventory of glacial lakes in Svalbard, focusing on the post-Little Ice Age evolution and their typology. The results show a consistent increase in the total area of glacial lakes from the 1930s to 2020 and suggest a link between climatic and geological factors and the formation of specific lake dam types. 134 glacial lake drainage events have been detected since the 1930s. Svalbard has one of the highest rates of glacial lake development in the world, indicating landscape changes in response to climate change.
JOURNAL OF GLACIOLOGY
(2023)
Article
Geography, Physical
Sierra M. Melton, Richard B. Alley, Sridhar Anandakrishnan, Byron R. Parizek, Michael G. Shahin, Leigh A. Stearns, Adam L. LeWinter, David C. Finnegan
Summary: Meltwater drainage systems play a role in influencing the timing of calving at the Helheim Glacier in East Greenland. A buoyant subglacial discharge plume consistently appears at the central terminus, separate from the occurrence of full-thickness calving, indicating an inverse relationship between the two.
JOURNAL OF GLACIOLOGY
(2022)
Article
Geography, Physical
B. Bellwald, S. Planke, S. Polteau, N. Lebedeva-Ivanova, J. Faleide, S. M. Morris, S. Morse, S. Castelltort
Summary: The study describes the morphology and formation of the Bjornelva River Valley in the SW Barents Sea, suggesting it may represent a braided river system fed by outburst floods from a glacial lake. The valley's configuration could be useful for geohazard assessments in areas at risk of outburst flooding today and as an analogue for landscapes evolving in regions currently covered by ice sheets.
JOURNAL OF GLACIOLOGY
(2021)
Article
Geography, Physical
Christine F. Dow
Summary: The Glacier Drainage System (GlaDS) model has revealed important discoveries about subglacial hydrology in Antarctica, including the presence of long, high-pressure subglacial channels that pump large volumes of freshwater into ice-shelf cavities. These channels have a direct impact on melt rates at critical grounding zone regions. Future ice dynamics and ice-shelf cavity models must incorporate subglacial hydrology to accurately predict the behavior of the Antarctic Ice Sheet.
ANNALS OF GLACIOLOGY
(2023)
Article
Multidisciplinary Sciences
Hans-Ulrich Auster, Istvan Apathy, Gerhard Berghofer, Karl-Heinz Fornacon, Anatoli Remizov, Chris Carr, Carsten Guettler, Gerhard Haerendel, Philip Heinisch, David Hercik, Martin Hilchenbach, Ekkehard Kuehrt, Werner Magnes, Uwe Motschmann, Ingo Richter, Christopher T. Russell, Anita Przyklenk, Konrad Schwingenschuh, Holger Sierks, Karl-Heinz Glassmeier
Article
Geochemistry & Geophysics
Andreas Hoerdt, Peter Weidelt, Anita Przyklenk
GEOPHYSICAL JOURNAL INTERNATIONAL
(2013)
Article
Instruments & Instrumentation
Sebastian Schaedel, Anita Przyklenk, Martin Stein, Karin Kniel, Eberhard Manske
TM-TECHNISCHES MESSEN
(2020)
Article
Engineering, Multidisciplinary
A. Przyklenk, S. Schaedel, M. Stein
Summary: The novel approach for screw thread calibrations developed by Physikalisch-Technische Bundesanstalt was verified to be more accurate than the standardized method in terms of pitch diameters, lead and flank angles.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Editorial Material
Engineering, Multidisciplinary
Anita Przyklenk, Alessandro Balsamo, Daniel O'Connor, Alexander Evans, Tanfer Yandayan, Sibel Asli Akgoz, Olena Flys, Dishi Phillips, Vit Zeleny, Dariusz Czulek, Felix Meli, Carlo Stefano Ragusa, Harald Bosse
Summary: Advanced manufacturing is identified as a key enabling technology with growing importance and requires new metrology methods. However, the lack of high-level coordination within the metrology community limits its impact on advanced manufacturing. The European Metrology Network for Advanced Manufacturing aims to address this issue by establishing a stakeholder dialogue and developing a research agenda.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Martin Stein, Frank Keller, Anita Przyklenk
Summary: The proposed unified theory introduces a universal 3D geometry model for threaded components and utilizes modern 3D coordinate measuring technology to evaluate the actual geometry through a high dimensional best-fit procedure. The results of the novel approach have been stable and allow for the evaluation of areal measurements without loss of information.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Jonas Hensel, Anita Przyklenk, Johanna Mueller, Markus Koehler, Klaus Dilger
Summary: This study aims to investigate and evaluate the surface topography of direct energy deposition (DED-arc) components. Waviness profiles were established and 2-dimensional height parameters were calculated to determine the surface quality levels under four different manufacturing parameters. The results show a mixed deterministic and random nature of the surface topography of DED-arc components.
MATERIALS & DESIGN
(2022)
Article
Geography, Physical
Jan Mudler, Andreas Hoerdt, Anita Przyklenk, Gianluca Fiandaca, Pradip Kumar Maurya, Christian Hauck