Letter
Geosciences, Multidisciplinary
N. Jullien, A. J. Tedstone, H. Machguth, N. B. Karlsson, V. Helm
Summary: We analyzed airborne accumulation radar data from 2002 to 2018 to investigate changes in the extent and thickness of ice slabs in Greenland. It was found that ice slabs several meters thick were already present before 2002. Between 2012 and 2018, the ice slabs expanded inland by 13,400-17,600 km(2), or 37%-44%. The study also demonstrated that the extremely warm summer of 2012 led to the formation of near-surface ice layers at higher elevations, enabling the development of ice slabs with only moderate melting in subsequent summers.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Riley Culberg, Winnie Chu, Dustin M. Schroeder
Summary: A recent study found extensive infiltration and refreezing of meltwater beneath ice slabs in Greenland, where the meltwater enters through surface crevasses into relict firn. This suggests that the firn can continue to buffer mass loss from surface runoff and limit meltwater export to the subglacial system even after ice slabs have formed. There may be a significant time lag between the formation of ice slabs and the complete surface runoff and meltwater drainage to the subglacial system.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Guodong Chen, Shengjun Zhang, Shenghao Liang, Jiaheng Zhu
Summary: This study analyzed the elevation and volume changes in the Greenland ice sheet from 2010 to 2019 using long-term altimetry data. The results revealed that the overall volume change rate in the GrIS slowed down by approximately 10% during the past decade, with the main contributor of ice loss shifting from the southeast coast to the west margin of the ice sheet.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Yen-Ru Lai, Lei Wang
Summary: This study investigates the joint analysis of laser and radar satellite altimeter measurements for estimating surface elevation changes of the Greenland Ice Sheet (GrIS). The results reveal important variations over a range of time scales, which would facilitate the investigation of complex spatiotemporal patterns of GrIS changes.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Multidisciplinary Sciences
Michael Wood, Eric Rignot, Ian Fenty, Lu An, Anders Bjork, Michiel van den Broeke, Cilan Cai, Emily Kane, Dimitris Menemenlis, Romain Millan, Mathieu Morlighem, Jeremie Mouginot, Brice Noel, Bernd Scheuchl, Isabella Velicogna, Josh K. Willis, Hong Zhang
Summary: Research shows that the intrusion of warm Atlantic Waters has significantly influenced the retreat of 226 marine-terminating glaciers in Greenland, particularly those located in deep fjords. Excluding ocean-induced undercutting in ice sheet projections may underestimate mass loss by at least a factor of 2.
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.
Article
Multidisciplinary Sciences
Andrew J. Christ, Paul R. Bierman, Joerg M. Schaefer, Dorthe Dahl-Jensen, Jorgen P. Steffensen, Lee B. Corbett, Dorothy M. Peteet, Elizabeth K. Thomas, Eric J. Steig, Tammy M. Rittenour, Jean-Louis Tison, Pierre-Henri Blard, Nicolas Perdrial, David P. Dethier, Andrea Lini, Alan J. Hidy, Marc W. Caffee, John Southon
Summary: Understanding the history of the Greenland Ice Sheet (GrIS) is crucial for determining its response to climate change and contribution to sea level rise. Through the analysis of subglacial sediment at the base of the Camp Century ice core, researchers have uncovered evidence of at least two episodes of ice-free, vegetated conditions in northwestern Greenland during the Pleistocene, suggesting that the GrIS persisted through much of the Pleistocene but experienced melting and reformation at least once since 1.1 million years ago.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Shuai Gao, Kang Yang, Yao Lu, Xin Lu, Manchun Li
Summary: This study proposes a method using supraglacial rivers to match multitemporal images and measure ice flow velocities. By integrating image information and GIS operations, the summer and annual ice flow velocities can be accurately calculated and validated with other ice flow velocity products, demonstrating the high accuracy of this method.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Geosciences, Multidisciplinary
J. Harper, J. Saito, N. Humphrey
Summary: High rainfall on the Greenland Ice Sheet is changing the thermal and structural composition of the surface layer. A 4-day cold-season warm/rain event caused significant changes in the firn column, with rapid warming and refreezing of liquid water. It took up to 8 weeks for the heat fluxes and water refreezing to return to normal, impacting the evolution and runoff characteristics of the ice sheet.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Jonathan L. Carrivick, Penelope How, James M. Lea, Jenna L. Sutherland, Michael Grimes, Fiona S. Tweed, Stephen Cornford, Duncan J. Quincey, Joseph Mallalieu
Summary: Ice-marginal lakes have a significant impact on glacier dynamics, but have been overlooked in studies on the Greenland ice sheet and peripheral glaciers. This study finds that lakes cover 10% of the Greenland ice margin and occur on 5% of peripheral glaciers. Ice velocity at lakes is around 25% higher than on land.
GEOPHYSICAL RESEARCH LETTERS
(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
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
Computer Science, Information Systems
Xiao-Guang Zhang, Guang-Hong Yang
Summary: This paper investigates stealthy attack problems in CPSs under the scheduling effects of the RRP, proposing a new attack model to overcome protocol-induced effects and obtaining the optimal attack strategy by solving an SDP problem.
INFORMATION SCIENCES
(2021)
Article
Environmental Sciences
Arthur Elmes, Charlotte Levy, Angela Erb, Dorothy K. Hall, Ted A. Scambos, Nicolo DiGirolamo, Crystal Schaaf
Summary: The Greenland ice sheet experienced an extreme early-season melt event in mid-June 2019 due to earlier-than-average melt onset and low prior winter snowfall, leading to a rapid decrease in surface albedo and greater solar energy absorption. Satellite data showed a significant and extended decrease in albedo in Greenland during 2019, resulting in increased radiative forcing of the ice sheet. The study also demonstrated the utility of Landsat-8 albedo product in capturing detailed spatial heterogeneity of the landscape for a more refined representation of the surface energy budget.
Article
Ecology
Matej Znaminko, Lukas Falteisek, Kristyna Vrbicka, Petra Klimova, Jesper R. Christiansen, Christian J. Jorgensen, Marek Stibal
Summary: Subglacial environments provide conditions suitable for microbial methane production, and high methane emissions have been discovered at a glacier in Greenland. The microbial assemblage exported in meltwater from the methane release hotspot is mainly composed of methylotrophs, and their relative abundance increases as the melt season progresses.
Article
Geosciences, Multidisciplinary
D. Felikson, S. Nowicki, I Nias, M. Morlighem, H. Seroussi
Summary: Numerical simulations of glacier evolution are crucial for predicting future sea-level change. Seasonal terminus oscillations have an effect on decadal-scale mass change. Neglecting seasonal oscillations can result in biased mass change projections, depending on bed slope and magnitude of oscillations.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geography, Physical
Alexander A. Robel, Samuel S. Pegler, Ginny Catania, Denis Felikson, Lauren M. Simkins
Summary: Observations show that some glaciers remain at peaks in bed topography despite significant changes in climate, but can undergo sudden retreat after several years or decades. Model simulations suggest that the persistence of a glacier at a bed peak is due to slowing ice flow as it moves up a reverse-sloping bed. It is difficult to determine the future behavior of glaciers solely based on current observations.
JOURNAL OF GLACIOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Isabel J. Nias, Sophie Nowicki, Denis Felikson, Bryant Loomis
Summary: Mass loss from the Greenland Ice Sheet is a combination of surface mass balance and discharge due to ice dynamics. Perturbations to glacier termini result in immediate velocity and mass loss, as well as a diffusive response over time due to ice thickness evolution. Modeling the committed response of the ice sheet can provide estimates of its contribution to future sea level rise.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Geochemistry & Geophysics
Y. Bidel, N. Zahzam, A. Bresson, C. Blanchard, A. Bonnin, J. Bernard, M. Cadoret, T. E. Jensen, R. Forsberg, C. Salaun, S. Lucas, M. F. Lequentrec-Lalancette, D. Rouxel, G. Gabalda, L. Seoane, D. T. Vu, S. Bruinsma, S. Bonvalot
Summary: An airborne gravity survey was conducted using an absolute gravimeter based on atom interferometry, as well as two relative gravimeters: a classical LaCoste & Romberg and a novel iMAR strapdown Inertial Measurement Unit. Measurement errors for the quantum gravimeter ranged from 0.6 to 1.3 mGal, depending on flight conditions and filtering methods. Similar errors were obtained with the iMAR strapdown gravimeter, but its long-term stability was five times worse. The traditional L&R platform gravimeter showed larger measurement errors (3-4 mGal). The results were compared to gravity data from marine, land, and altimetry measurements, showing good agreement for the quantum gravimeter with standard deviations and means on differences below or equal to 2 mGal. This study confirms the potential of quantum technology for absolute airborne gravimetry, especially for mapping shallow water or mountainous areas and for connecting ground and satellite measurements with homogeneous absolute referencing.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geology
Nanna B. Karlsson, Kenneth D. Mankoff, Anne M. Solgaard, Signe H. Larsen, Penelope R. How, Robert S. Fausto, Louise S. Sorensen
Summary: This study presents a data set that provides a comprehensive overview of the flow of freshwater from marine-terminating glaciers to the Greenlandic fjords by integrating existing products. The study also compares different methods used to calculate glacier drainage basins and their impact on the results.
Article
Geosciences, Multidisciplinary
Alice C. Fremand, Peter Fretwell, Julien A. Bodart, Hamish D. Pritchard, Alan Aitken, Jonathan L. Bamber, Robin Bell, Cesidio Bianchi, Robert G. Bingham, Donald D. Blankenship, Gino Casassa, Ginny Catania, Knut Christianson, Howard Conway, Hugh F. J. Corr, Xiangbin Cui, Detlef Damaske, Volkmar Damm, Reinhard Drews, Graeme Eagles, Olaf Eisen, Hannes Eisermann, Fausto Ferraccioli, Elena Field, Rene Forsberg, Steven Franke, Shuji Fujita, Yonggyu Gim, Vikram Goel, Siva Prasad Gogineni, Jamin Greenbaum, Benjamin Hills, Richard C. A. Hindmarsh, Andrew O. Hoffman, Per Holmlund, Nicholas Holschuh, John W. Holt, Annika N. Horlings, Angelika Humbert, Robert W. Jacobel, Daniela Jansen, Adrian Jenkins, Wilfried Jokat, Tom Jordan, Edward King, Jack Kohler, William Krabill, Mette Kusk Gillespie, Kirsty Langley, Joohan Lee, German Leitchenkov, Carlton Leuschen, Bruce Luyendyk, Joseph MacGregor, Emma MacKie, Kenichi Matsuoka, Mathieu Morlighem, Jeremie Mouginot, Frank O. Nitsche, Yoshifumi Nogi, Ole A. Nost, John Paden, Frank Pattyn, Sergey V. Popov, Eric Rignot, David M. Rippin, Andres Rivera, Jason Roberts, Neil Ross, Anotonia Ruppel, Dustin M. Schroeder, Martin J. Siegert, Andrew M. Smith, Daniel Steinhage, Michael Studinger, Bo Sun, Ignazio Tabacco, Kirsty Tinto, Stefano Urbini, David Vaughan, Brian C. Welch, Douglas S. Wilson, Duncan A. Young, Achille Zirizzotti
Summary: One of the key components of this research is to map Antarctic bed topography and ice thickness parameters, which are crucial for modeling ice flow and predicting future ice loss and sea level rise. The Bedmap3 Action Group, supported by SCAR, aims to produce new gridded maps and make geophysical survey data points available for the international scientific community. They have introduced the SCAR Bedmap Data Portal to provide open access to these datasets. This data release is expected to greatly benefit Antarctic research and extend the life cycle of the data.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geochemistry & Geophysics
Andreas Theodosiou, Marcel Kleinherenbrink, Paco Lopez-Dekker
Summary: Estimating sea surface height with cross-track interferometry requires high sensitivity due to the small magnitude of the ocean surface signal. A squinted line of sight, combined with a helix satellite formation, can optimize the baselines to meet the requirements. This article presents a model to evaluate the performance of a formation-flying cross-track interferometer using a squinted line of sight. Case studies demonstrate that the system can accurately estimate surface elevation at submesoscales and resolve spatial scales up to 47 km.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geosciences, Multidisciplinary
Ines N. Otosaka, Andrew Shepherd, Erik R. Ivins, Nicole-Jeanne Schlegel, Charles Amory, Michiel R. van den Broeke, Martin Horwath, Ian Joughin, Michalea D. King, Gerhard Krinner, Sophie Nowicki, Anthony J. Payne, Eric Rignot, Ted Scambos, Karen M. Simon, Benjamin E. Smith, Louise S. Sorensen, Isabella Velicogna, Pippa L. Whitehouse, A. Geruo, Cecile Agosta, Andreas P. Ahlstrom, Alejandro Blazquez, William Colgan, Marcus E. Engdahl, Xavier Fettweis, Rene Forsberg, Hubert Gallee, Alex Gardner, Lin Gilbert, Noel Gourmelen, Andreas Groh, Brian C. Gunter, Christopher Harig, Veit Helm, Shfaqat Abbas Khan, Christoph Kittel, Hannes Konrad, Peter L. Langen, Benoit S. Lecavalier, Chia-Chun Liang, Bryant D. Loomis, Malcolm McMillan, Daniele Melini, Sebastian H. Mernild, Ruth Mottram, Jeremie Mouginot, Johan Nilsson, Brice Noel, Mark E. Pattle, William R. Peltier, Nadege Pie, Monica Roca, Ingo Sasgen, Himanshu V. Save, Ki-Weon Seo, Bernd Scheuchl, Ernst J. O. Schrama, Ludwig Schroder, Sebastian B. Simonsen, Thomas Slater, Giorgio Spada, Tyler C. Sutterley, Bramha Dutt Vishwakarma, Jan Melchior van Wessem, David Wiese, Wouter van der Wal, Bert Wouters
Summary: Ice losses from Greenland and Antarctica have accelerated since the 1990s, contributing to a significant rise in global mean sea level. A new 29-year record of ice sheet mass balance from 1992 to 2020, combining 50 independent estimates, reveals that the ice sheets contributed 21 +/- 1.9mm to global mean sea level. The rate of mass loss increased from 105 Gt/yr between 1992 and 1996 to 372 Gt/yr between 2016 and 2020.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Remote Sensing
Ines Barbero-Garcia, Mieke Kuschnerus, Sander Vos, Roderik Lindenbergh
Summary: Efforts are being made to monitor and understand the dynamics of sandy beaches, as they are subject to changes from natural and anthropogenic factors. This study presents a methodology for detecting anthropogenic changes in coastal ecosystems by automatically identifying active bulldozers in beach video data. By using PCA and the YOLO algorithm, the bulldozers in change images can be accurately detected. The correlation between the results of this methodology and 3D data obtained from a laser scanner was computed for validation.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Article
Remote Sensing
Mate Cserep, Roderik Lindenbergh
Summary: The evolution and spreading of data capturing methods have led to exponential growth in the amount of spatial data maintained by companies and organizations. However, methods for extracting information from such data are often not efficient. This paper analyzes the possibilities for nation-wide change detection using airborne laser altimetry point clouds and proposes a workflow that can accurately distinguish modifications in the built-up area from other changes and noise. The proposed method shows promising results in terms of accuracy and computational efficiency.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Article
Quantum Science & Technology
Sven Abend, Baptiste Allard, Aidan S. Arnold, Ticijana Ban, Liam Barry, Baptiste Battelier, Ahmad Bawamia, Quentin Beaufils, Simon Bernon, Andrea Bertoldi, Alexis Bonnin, Philippe Bouyer, Alexandre Bresson, Oliver S. Burrow, Benjamin Canuel, Bruno Desruelle, Giannis Drougakis, Rene Forsberg, Naceur Gaaloul, Alexandre Gauguet, Matthias Gersemann, Paul F. Griffin, Hendrik Heine, Victoria A. Henderson, Waldemar Herr, Simon Kanthak, Markus Krutzik, Maike D. Lachmann, Roland Lammegger, Werner Magnes, Gaetano Mileti, Morgan W. Mitchell, Sergio Mottini, Dimitris Papazoglou, Franck Pereira dos Santos, Achim Peters, Ernst Rasel, Erling Riis, Christian Schubert, Stephan Tobias Seidel, Guglielmo M. Tino, Mathias van den Bossche, Wolf von Klitzing, Andreas Wicht, Marcin Witkowski, Nassim Zahzam, Michal Zawada
Summary: Recent developments in quantum technology have led to the creation of a new generation of sensors that can measure inertial quantities with unprecedented sensitivity and accuracy. European laboratories have been at the forefront of this field, developing concepts and tools to operate these quantum sensors in relevant environments. The challenge now is to achieve a sufficiently high technology readiness level to provide off-the-shelf payload for future space missions.
AVS QUANTUM SCIENCE
(2023)
Proceedings Paper
Engineering, Aerospace
Omer Gokberk Narin, Roderik Lindenbergh, Saygin Abdikan
Summary: In this study, a multi-variable strategy is proposed to determine the elevation of the terrain with GEDI data, taking into account the atmospheric effects. The evaluation of the strategy shows that filtering steps can significantly improve the accuracy of the data, especially under cloud free conditions. However, the accuracy of the data decreases notably when the solar elevation is close to 0.
2023 10TH INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN AIR AND SPACE TECHNOLOGIES, RAST
(2023)
Proceedings Paper
Remote Sensing
Daan Hulskemper, Katharina Anders, Jose A. A. Antolinez, Mieke Kuschnerus, Bernhard Hoefle, Roderik Lindenbergh
Summary: This research explores automated methods for extracting and clustering different types of surface activities using terrestrial laser scanning technology, and their application on a sandy beach. The results show that unsupervised identification and characterization of surface activities can be achieved using Self-organizing Maps (SOM) and hierarchical clustering.
OPTICAL 3D METROLOGY (O3DM)
(2022)
Article
Geography, Physical
Christian J. Taubenberger, Denis Felikson, Thomas Neumann
Summary: The dynamic changes of marine-terminating outlet glaciers play a significant role in future ice loss from the Greenland Ice Sheet. However, a unified understanding of the processes driving these changes is lacking. By analyzing the patterns of seasonal thickness change in 37 outlet glaciers using data from ICESat-2, researchers have identified both similarities and heterogeneities in these patterns. Further studies can build upon these findings by investigating the relationship between seasonal thickness changes and external forcings, as well as other dynamic variables such as glacier velocity and terminus position changes.
