Article
Multidisciplinary Sciences
Laura A. Stevens, Meredith Nettles, James L. Davis, Timothy T. Creyts, Jonathan Kingslake, Ian J. Hewitt, Aaron Stubblefield
Summary: The impact of increasing surface melt on the annual discharge of the Greenland Ice Sheet is unclear. Observations of a supraglacial lake drainage at Helheim Glacier show that basal floods following these events have limited effect on ice flow. The discharge of the ice sheet to the ocean is mainly controlled by fast-flowing outlet glaciers, and the influence of increasing surface melt on annual discharge is still unknown.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
A. M. Solgaard, D. Rapp, B. P. Y. Noel, C. S. Hvidberg
Summary: This study analyzed high-resolution ice velocity data of the Greenland Ice Sheet using a clustering algorithm and identified characteristic seasonal flow patterns. The results showed spatial and interannual variability in these flow patterns, which are linked to water availability at the base of the ice.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Wensong Zhang, Kang Yang, Laurence C. Smith, Yuhan Wang, Dirk van As, Brice Noe, Yao Lu, Jinyu Liu
Summary: This study investigates the spatiotemporal distribution and variability of surface water in Greenland using Sentinel-2 imagery and model simulations. The results show significant differences in surface water extent, volume, and drainage pattern between different years and regions, with supraglacial rivers playing a dominant role in surface water appearance.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
David M. Chandler, Jemma L. Wadham, Peter W. Nienow, Samuel H. Doyle, Andrew J. Tedstone, Jon Telling, Jonathan Hawkings, Jonathan D. Alcock, Benjamin Linhoff, Alun Hubbard
Summary: Intensive study of the Greenland Ice Sheet's subglacial drainage has shown efficient drainage development under thick ice, with this research providing valuable data to validate and improve current numerical drainage system models. The study revealed a fast/efficient subglacial drainage system extending under ice over 900m thick, which remained stable even under variable melt inputs. This research emphasizes the importance of understanding subglacial drainage dynamics in the context of ice dynamics and hydrology.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Jacqueline Otto, Felicity A. Holmes, Nina Kirchner
Summary: This study presents recent changes in supraglacial lake distribution, expansion, drainage behavior, and frequency in Ryder Glacier, Northern Greenland, using remote sensing analysis. The results show that increasing global temperatures lead to inland expansion of supraglacial lakes and their impact on larger areas of the ice sheet. However, due to limited understanding of the dynamics of lake expansion, assessments of future implications remain uncertain.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Adrien Gilbert, Florent Gimbert, Kjetil Thogersen, Thomas Schuler, Andreas Kaab
Summary: Below hard-bedded glaciers, both basal friction and distributed subglacial drainage are controlled by a network of cavities. Previous models had a physical inconsistency issue, but our coupling approach provides a better explanation for the observed glacier sliding speed.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Water Resources
Dongyu Zhu, Chunxia Zhou, Yikai Zhu, Boyang Peng
Summary: This study investigates the Supraglacial lakes (SGLs) of Sermeq Avannarleq glacier in southwest Greenland and analyzes the seasonal changes of these lakes from 2000 to 2020 using satellite images. The results show an increase in the area, volume, and depth of the lakes, as well as changes in the melting area and elevation.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Geography, Physical
Kristin Poinar, Lauren C. Andrews
Summary: This study used remote-sensing data to analyze the relationship between strain rates and lake drainages in western Greenland. The study found that moulins associated with fast-draining lakes have significantly higher extensional background strain rates. However, the current ice sheet velocity products cannot accurately resolve the transient strain rates that drive fast lake drainages.
Article
Environmental Sciences
Yi Fan, Weifeng Hao, Baojun Zhang, Chao Ma, Shengjun Gao, Xiao Shen, Fei Li
Summary: Monitoring the hydrological activities of subglacial lakes is crucial for understanding the subglacial hydrological system and evaluating the changes in the Antarctic ice sheet. Satellite altimetry is used to observe the elevation changes caused by drainage or filling events. This study analyzed data from CryoSat-2 and ICESat-2 to obtain the time series of ice surface elevation changes for 17 active lakes. The results showed that there were periodic hydrological activities in certain lakes, and the uncertainties were higher for lakes with rough ice surfaces. The study also inferred the hydrological connections between the lakes using simulated water pathways.
Article
Geography, Physical
Jenny Turton, Philipp Hochreuther, Nathalie Reimann, Manuel T. Blau
Summary: The Nioghalvfjerdsfjorden glacier, also known as the 79 degrees North Glacier, drains about 8% of the Greenland Ice Sheet, with supraglacial lakes influencing seasonal ice velocity. Research has shown that climatic conditions greatly affect the onset, extent, and duration of melt ponds, with higher temperatures and rainfall events leading to more extensive ponds at higher elevations. Conversely, colder temperatures and accumulated snowpack limit the development of lakes to lower altitudes. There is evidence of inland expansion and increases in the total area of lakes compared to the early 2000s, in line with future global warming scenarios.
Article
Geography, Physical
Rohi Muthyala, Asa K. Rennermalm, Sasha Z. Leidman, Matthew G. Cooper, Sarah W. Cooley, Laurence C. Smith, Dirk van As
Summary: This study presents long-term discharge data for a supraglacial stream catchment in southwest Greenland, capturing diurnal and seasonal variability. Shortwave radiation is the primary driver of melting, but its contribution decreases during high-melt episodes, while longwave radiation, sensible heat fluxes, and latent heat fluxes become more important. The timing of daily maximum discharge changes, possibly due to the expansion and contraction of the stream network.
Article
Geosciences, Multidisciplinary
T. R. Chudley, P. Christoffersen, S. H. Doyle, T. P. F. Dowling, R. Law, C. M. Schoonman, M. Bougamont, B. Hubbard
Summary: This study reveals that crevasse ponding on the Greenland Ice Sheet is influenced by surface stress and does not follow the same controls as supraglacial lakes and crevasses. The preferential location of ponded crevasses in regions of compressive surface-parallel mean stress indicates a spatially heterogeneous transfer of meltwater, impacting processes such as subglacial drainage and ice heating.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Nathan Maier, Jonas Kvist Andersen, Jeremie Mouginot, Florent Gimbert, Olivier Gagliardini
Summary: Surface melt can cause ice-flow accelerations on glaciers and ice sheets in both summer and winter. In this study, researchers have found that winter meltwater-induced accelerations occur in Greenland as well. They observed supraglacial lakes draining at high elevation, leading to a significant increase in flow velocity over a large region. By analyzing the surface velocity field and flood propagation, they gained novel insights into subglacial water pathways, drainage morphology, and basal sliding. These events are likely common and their cumulative impact on glacier dynamics needs further evaluation.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Jesper R. Christiansen, Thomas Rockmann, Maria E. Popa, Celia J. Sapart, Christian J. Jorgensen
Summary: Direct gaseous emissions of methane and carbon dioxide from the subglacial environment under the Greenland Ice Sheet have been discovered, with the main source being the degassing of subglacial meltwater. The emissions of CH4 and CO2 are influenced by meltwater runoff, and isotopic analysis suggests microbial methanogenesis as the source of methane and mixed sources for CO2 emissions. Continuous studies throughout melt seasons are needed to further understand the origin and magnitude of these emissions and their relation to glacial dynamics.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geography, Physical
Corinne L. Benedek, Ian C. Willis
Summary: Surface lakes on the Greenland Ice Sheet play a crucial role in its mass balance, hydrology, and biogeochemistry, often draining rapidly via hydrofracture which impacts subglacial drainage evolution and ice flow. Satellite imagery analysis reveals that rapid lake drainage events can occur not just in summer, but also in winter, influencing subglacial hydrology and biogeochemical processes.
Article
Geosciences, Multidisciplinary
Matt A. King, Christopher S. Watson, Duanne White
Summary: This study investigates the vertical motion of bedrock in the Totten-Denman glacier region of East Antarctica using new GPS timeseries. The analysis suggests that surface mass balance loading is the dominant factor contributing to random-walk-like noise in GPS data. After correcting for various factors, subsidence is observed in all sites except for the Totten Glacier region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Achraf Koulali, Pippa L. Whitehouse, Peter J. Clarke, Michiel R. van den Broeke, Grace A. Nield, Matt A. King, Michael J. Bentley, Bert Wouters, Terry Wilson
Summary: This study investigates the response of the solid Earth to surface mass balance (SMB) variations in the Southern Antarctic Peninsula (SAP) using GPS vertical time series. The results show that interannual SMB anomalies cause measurable elastic deformation, indicating the importance of considering SMB variability in understanding the glacial isostatic adjustment signal in Antarctica.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Marco Moeller, Peter Friedl, Steven J. Palmer, Ben Marzeion
Summary: The two outlet basins of Flade Isblink ice cap in NE Greenland experienced surges, causing the retreat of ice shelf and significant reduction in ice discharge.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geology
Danni M. Pearce, James M. Lea, Douglas W. F. Mair, Brice R. Rea, J. Edward Schofield, Nicholas A. Kamenos, Kathryn M. Schoenrock, Lukasz Stachnik, Bonnie Lewis, Iestyn Barr, Ruth Mottram
Summary: Our understanding of the relationship between climate and mass flux from marine-terminating tidewater glaciers (TWGs) in the Greenland Ice Sheet has been improved through the study of the largest tidewater glacier in southwest Greenland. The data from the study provide a long-term record of the glacier's advance during the first half of the past millennium and demonstrate the sensitivity of TWGs to climate cooling. These findings validate numerical modeling approaches and have significant implications for prognostic modeling.
Review
Multidisciplinary Sciences
Chris R. Stokes, Nerilie J. Abram, Michael J. Bentley, Tamsin L. Edwards, Matthew H. England, Annie Foppert, Stewart S. R. Jamieson, Richard S. Jones, Matt A. King, Jan T. M. Lenaerts, Brooke Medley, Bertie W. J. Miles, Guy J. G. Paxman, Catherine Ritz, Tina van de Flierdt, Pippa L. Whitehouse
Summary: The East Antarctic Ice Sheet, which contains the majority of Earth's glacier ice, is considered less vulnerable to global warming compared to other ice sheets. However, recent mass loss in certain regions has prompted a re-evaluation of its sensitivity to climate change. While some marine-based catchments are currently losing mass, projections indicate increased accumulation in the East Antarctic Ice Sheet over the next century, maintaining overall balance. However, under high-emissions scenarios beyond 2100, significant ice discharge and sea-level rise could occur unless the Paris Agreement goals are met.
Article
Geochemistry & Geophysics
Mohammad-Hadi Rezvani, Christopher S. S. Watson, Matt A. A. King
Summary: The study employed a space-time Kalman approach to investigate vertical land motion and altimeter systematic errors around the Australian coast, revealing new findings such as coastal subsidence, time variability in altimeter errors, and acceleration of ASL rates. The study's approach improves the ability to explore nonlinear localized signals and is suitable for other regional- and global-scale studies.
JOURNAL OF GEODESY
(2022)
Article
Geochemistry & Geophysics
Grace A. Nield, Matt A. King, Achraf Koulali, Nahidul Samrat
Summary: Large earthquakes near Antarctica can cause postseismic deformation that needs to be considered when constraining geophysical models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geography, Physical
Yubin Fan, Chang-Qing Ke, Xiaoyi Shen, Yao Xiao, Stephen J. J. Livingstone, Andrew J. J. Sole
Summary: Using ICESat-2 data, we identified 18 active subglacial lakes, 16 of which had not been previously reported. By utilizing multi-temporal ArcticDEM strip maps, we verified the existence of these lakes and determined their drainage history. After correcting the elevation data, significant localized elevation anomalies were measured in all detected subglacial lakes, demonstrating the potential of combining ICESat-2 and ArcticDEM.
Article
Environmental Sciences
Boye Zhou, Christopher Watson, Benoit Legresy, Matt A. King, Jack Beardsley
Summary: In this paper, an improved GNSS buoy approach was proposed for altimetry validation, which was enhanced based on in situ observations. The results showed that the implementation of different ambiguity fixing strategies for various constellations in the processing software TRACK led to a reduction of up to 3 cm in the root mean square of the buoy minus co-located mooring sea surface height residuals. It was also suggested that there might exist a common mode error external to GNSS processing, as indicated by the comparison between double differencing and precise point positioning solutions. The performance of the buoy design under real operating conditions was assessed using GNSS and INS observations, showing no significant relationship under different ocean conditions and sea states.
Article
Geography, Physical
Sophie Goliber, Taryn Black, Ginny Catania, James M. Lea, Helene Olsen, Daniel Cheng, Suzanne Bevan, Anders Bjork, Charlie Bunce, Stephen Brough, J. Rachel Carr, Tom Cowton, Alex Gardner, Dominik Fahrner, Emily Hill, Ian Joughin, Niels J. Korsgaard, Adrian Luckman, Twila Moon, Tavi Murray, Andrew Sole, Michael Wood, Enze Zhang
Summary: In this study, a database of manually digitized terminus traces is presented for machine learning and scientific applications. The dataset includes 39,060 individual terminus traces for 278 glaciers, which have been collected, cleaned, and assigned with appropriate metadata for easy access by scientists.
Article
Geography, Physical
Ole Richter, David E. Gwyther, Matt A. King, Benjamin K. Galton-Fenzi
Summary: This study quantifies the impact of tides on Antarctic ice shelf melting and continental shelf seas using an ocean model. It finds that activating tides increases total basal mass loss and decreases continental shelf temperatures. Tidal currents strongly influence the turbulent exchange of heat and salt, with both dynamical and thermodynamic effects driving the melting process. These findings highlight the importance of incorporating tides into glacier system and shelf sea modeling.
Article
Geography, Physical
Benjamin Joseph Davison, Tom Cowton, Andrew Sole, Finlo Cottier, Pete Nienow
Summary: A study found that submarine iceberg melting has three main effects on glacier-adjacent water properties, including cooling and freshening in the upper water column, warming of Polar Water at intermediate depths due to upwelling of warm Atlantic Water caused by iceberg melt, and warming or cooling of the deeper Atlantic Water layer. Iceberg melt also makes water properties more uniform with depth, and these effects are more pronounced in fjords with higher iceberg concentrations and deeper iceberg keels.
Article
Geosciences, Multidisciplinary
Grace A. Nield, Matt A. King, Rebekka Steffen, Bas Blank
Summary: The finite-element model presented in this study, built in the software package Abaqus, is a global and spherical model designed to calculate post-seismic deformation in the far field of major earthquakes. The model includes linear Maxwell and biviscous rheological models, can be easily adapted to different lateral variations in Earth structure, and has been benchmarked against existing models for various fault geometries with good agreement. Due to the inclusion of self-gravity, the model has the potential to predict deformation in response to multiple sources of stress change.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Geography, Physical
David W. Ashmore, Douglas W. F. Mair, Jonathan E. Higham, Stephen Brough, James M. Lea, Isabel J. Nias
Summary: This study applies the POD technique to analyze an ice velocity dataset from Sermeq Kujalleq in Greenland, finding three dominant modes related to glaciological processes. The primary dominant mode is associated with stress reconfiguration at the glacier terminus, while the second and third modes are linked to the development of the glacier's hydrological system.
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
