Article
Geography, Physical
Christophe Ogier, Dirk-Jan van Manen, Hansruedi Maurer, Ludovic Rass, Marian Hertrich, Andreas Bauder, Daniel Farinotti
Summary: Ground penetrating radar (GPR) has been widely used in glaciology to study glaciers' properties such as ice thickness and water content. However, interpreting GPR data in temperate glaciers is challenging due to strong scattering and attenuation. This study uses numerical modeling to investigate the effects of liquid water content and water inclusions on GPR signals, and finds that their impact is larger than that of other factors such as wet snowpack or heterogeneous ice permittivity distribution. The presence of water inclusions is shown to be necessary and sufficient for reproducing the typical characteristics of GPR data in the field.
JOURNAL OF GLACIOLOGY
(2023)
Article
Geochemistry & Geophysics
Sanchari Thakur, Leonardo Carrer, Lorenzo Bruzzone
Summary: This study focuses on the subsurface detection performance of an Earth-orbiting radar sounder mission with a distributed architecture, taking into account the ionospheric effects. By simulating radar responses, considering ionospheric scintillation effects and phase dispersion effects, and applying compensation techniques, the study finds that subsurface targets can be detected within a certain range, and ionospheric phase scintillations have negligible effects on the detection performance.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Samuel J. Cook, Poul Christoffersen, Martin Truffer, Thomas R. Chudley, Antonio Abellan
Summary: The study reveals significant variations in calving activity over time that cannot be simply described by mathematical relationships. There is a statistically significant relationship between surface melt and the number of calving events, but no direct correlation between surface melt and the volume of these events. Additionally, calving losses appear to have no clear single control factor.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geochemistry & Geophysics
Andreas Benedikter, Marc Rodriguez-Cassola, Felipe Betancourt-Payan, Gerhard Krieger, Alberto Moreira
Summary: One challenge in interpreting low-frequency synthetic aperture radar (SAR) imagery of semitransparent media, such as ice sheets, is the ambiguity in the position of scattering structures within the glacial volume. This study presents a novel inversion procedure to estimate volume parameters of ice sheets based on single-image single-polarization SAR acquisitions. The procedure utilizes phase errors in the SAR data to quantify and spatially resolve the depth of the scattering layer and the dielectric permittivity of the ice.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Qian Liang, Ninglian Wang
Summary: In this study, Synthetic Aperture Radar (SAR) images were used to extract the surface flow velocity of the Siachen Glacier. The average flow velocity of the glacier was found to be 38.25 m/year, with the highest velocity observed in upper tributaries. Seasonal patterns and mass balance calculations were also analyzed, revealing spatial heterogeneity in glacier changes.
Article
Geosciences, Multidisciplinary
Sarah F. Child, Leigh A. Stearns, C. J. van der Veen, Pedro Elosegui
Summary: Research on Byrd Glacier reveals that short-lived flow accelerations can lead to abnormally large basal crevasses near the grounding line. Airborne radar measurements and particle tracking help understand the height and formation process of these crevasses, which have an impact on both Byrd Glacier and the Ross Ice Shelf.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
W. D. Harcourt, D. A. Robertson, D. G. Macfarlane, B. R. Rea, M. Spagnolo
Summary: This article highlights the importance and feasibility of using a 94 GHz radar for glacier mapping. Through the collection of 94 GHz radar backscatter data from the surface of Rhonegletscher in Switzerland, the study demonstrates that glacier surfaces are efficient scattering targets and that 3D glacier mapping at this frequency is more accurate than other ground-based radars. The main conclusion is that 94 GHz radar is an effective tool for glacier monitoring and opens up new possibilities for studying glacier processes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Janis Karuss, Kristaps Lamsters, Ireneusz Sobota, Jurijs Jeskins, Peteris Dzerins, Andrew Hodson
Summary: The study of the thermal structure and drainage system of Waldemarbreen shows that hydrofracturing at higher elevations can play a major role in englacial water drainage through cold ice, in contrast to the cut and closure mechanism forming conduits in parts of the lower ablation area.
JOURNAL OF GLACIOLOGY
(2022)
Article
Remote Sensing
Gang Li, Xiao Chen, Hui Lin, Andrew Hooper, Zhuoqi Chen, Xiao Cheng
Summary: This study investigates the ability of monitoring the melting status of the Greenland Ice Sheet using Sentinel-1 dual-polarized images. The results show different patterns of ice surface dielectric constant dynamics at different elevations. The findings demonstrate that dual-polarized Sentinel-1 C-band SAR images can effectively capture the surface melting of the ice sheet.
GEO-SPATIAL INFORMATION SCIENCE
(2023)
Article
Geochemistry & Geophysics
Si-Wei Chen, Ming-Dian Li, Xing-Chao Cui, Hao-Liang Li
Summary: Polarimetric radar has become mainstream in microwave remote sensing for its ability to acquire full polarization information. However, radar target scattering responses are strongly orientation dependent, which makes target detection and recognition more difficult. This article thoroughly investigates and summarizes the polarimetric roll-invariant features, which are independent of target orientations along the radar line of sight. The article also explores the potential of these features for PolSAR ship detection and demonstrates their superior performance compared to normal polarimetric features.
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
(2023)
Article
Chemistry, Physical
Jose Hernandez-Munoz, Pedro Tarazona, Enrique Chacon
Summary: Within the extended Capillary Wave Theory (ECWT), a method is proposed to extract the bending modulus of a liquid surface by separating capillary waves from a non-capillary wave background. The method shows good agreement with molecular dynamics simulations and surface diffraction experiments, providing an interpretation for the fluctuating behavior of the liquid surface.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Ganggang Dong, Hongwei Liu
Summary: This article proposes a new method that combines physical modeling and deep learning to overcome the overfitting problem caused by limited training samples and poor quality radar images. The method includes radar measurement simulation, target reconstruction, residual calculation, data masking, and reimaging process to generate new radar measurements. Comparative studies demonstrate the advantages of this method in improving the learning efficiency of deep models under limited sample environments.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Review
Computer Science, Interdisciplinary Applications
Thomas Trantow, Ute C. Herzfeld, Veit Helm, Johan Nilsson
Summary: The CryoSat-2 satellite mission provides crucial data on the Earth's cryosphere, especially the Bering-Bagley Glacier System in southeast Alaska. Different retracking methods for satellite measurements can significantly impact elevation and elevation-change analysis.
COMPUTERS & GEOSCIENCES
(2021)
Article
Environmental Sciences
Hoonyol Lee, Heejeong Seo, Hyangsun Han, Hyeontae Ju, Joohan Lee
Summary: The study investigated two velocity anomalies in the Campbell Glacier in East Antarctica, which may be related to bed hills in the glacial valley, causing temporal variation in ice velocity. Analysis from Ice Penetrating Radar (IPR) surveys revealed the possible presence of basal water at the location of velocity anomaly A, while crevasses began to appear at velocity anomaly B.
Article
Environmental Sciences
Pratima Pandey, Rupendra Singh, Ashutosh Venkatesh Prasad, Anirudha Mahagaonkar, S. Nawaz Ali
Summary: This study classified the glacier facies or radar glacier zones of surge-type glaciers in the Karakoram Himalaya based on the differences in backscatter values using multi-temporal SAR data from the Sentinel-1 satellite. The results showed a distinct distribution pattern of facies on surge-type glaciers, different from non-surge-type glaciers, and not correlated with glacier elevation.
GEOCARTO INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Benjamin H. Hills, Joel T. Harper, Neil F. Humphrey, Toby W. Meierbachtol
GEOPHYSICAL RESEARCH LETTERS
(2017)
Letter
Geography, Physical
Toby W. Meierbachtol, Joel T. Harper, Neil F. Humphrey
JOURNAL OF GLACIOLOGY
(2018)
Article
Geosciences, Multidisciplinary
Jacob Z. Downs, Jesse V. Johnson, Joel T. Harper, Toby Meierbachtol, Mauro A. Werder
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2018)
Article
Multidisciplinary Sciences
Nathan Maier, Neil Humphrey, Joel Harper, Toby Meierbachto
Article
Geography, Physical
Caitlyn Florentine, Joel Harper, Daniel Fagre
GLOBAL AND PLANETARY CHANGE
(2020)
Article
Biodiversity Conservation
James J. Elser, Chenxi Wu, Angelica L. Gonzalez, Daniel H. Shain, Heidi J. Smith, Ruben Sommaruga, Craig E. Williamson, Janice Brahney, Scott Hotaling, Joseph Vanderwall, Jinlei Yu, Vladimir Aizen, Elena Aizen, Tom J. Battin, Roberto Camassa, Xiu Feng, Hongchen Jiang, Lixin Lu, John J. Qu, Ze Ren, Jun Wen, Lijuan Wen, H. Arthur Woods, Xiong Xiong, Jun Xu, Gongliang Yu, Joel T. Harper, Jasmine E. Saros
GLOBAL CHANGE BIOLOGY
(2020)
Article
Geography, Physical
Aidan Stansberry, Joel Harper, Jesse Johnson, Toby Meierbachtol
Summary: Using a thermo-mechanically coupled model, this study examines the retreat of the ice sheet in western Greenland and its impact on the frozen and melted fractions of the bed. The results suggest that the migration of the frozen area is mainly influenced by the frictional and strain heating fields, while the bedrock acts as a heat sink to slow down the contraction of frozen-bed conditions. The findings highlight the importance of both geometric changes and the thermal state of the bedrock and ice in determining the migration of melted regions.
JOURNAL OF GLACIOLOGY
(2022)
Article
Geography, Physical
Jun Saito, Toby Meierbachtol, Joel Harper
Summary: Regional assessments of ice elevation change in Southwest Greenland's land terminating sector reveal complex spatial and temporal variations. The central region experienced more significant thinning, while the north and south regions demonstrated a net thickening trend. These regional differences in elevation change are inconsistent with surface mass balance anomalies, suggesting that changes in ice flow contribute to the thickness changes in the north and south.
JOURNAL OF GLACIOLOGY
(2023)
Article
Geography, Physical
Rosemary Leone, Joel Harper, Toby Meierbachtol, Neil Humphrey
Article
Geography, Physical
Benjamin H. Hills, Joel T. Harper, Toby W. Meierbachtol, Jesse V. Johnson, Neil F. Humphrey, Patrick J. Wright
Article
Geosciences, Multidisciplinary
Brett Woelber, Marco P. Maneta, Joel Harper, Kelsey G. Jencso, W. Payton Gardner, Andrew C. Wilcox, Ignacio Lopez-Moreno
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2018)
Article
Geography, Physical
Caitlyn Florentine, Joel Harper, Daniel Fagre, Johnnie Moore, Erich Peitzsch
Article
Geography, Physical
Joel Brown, Joel Harper, Neil Humphrey
Article
Geosciences, Multidisciplinary
Adam M. Clark, Daniel B. Fagre, Erich H. Peitzsch, Blase A. Reardon, Joel T. Harper
EARTH SYSTEM SCIENCE DATA
(2017)
Article
Geosciences, Multidisciplinary
Caitlyn Florentine, Joel Harper, Jesse Johnson, Toby Meierbachtol
FRONTIERS IN EARTH SCIENCE
(2018)