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Quantifying the impact of X-band InSAR penetration bias on elevation change and mass balance estimation Ann. Glaciol. (IF 2.9) Pub Date : 2024-02-05 Sahra Abdullahi, David Burgess, Birgit Wessel, Luke Copland, Achim Roth
Interferometric synthetic aperture radar (InSAR) data suffer from an elevation bias due to signal penetration into the firn and ice surface, rendering the height information unusable for elevation and mass-change detection. This study estimates the penetration bias in X-band InSAR data to quantify its impact on elevation and mass-change detection and to demonstrate the applicability of TanDEM-X digital
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Resolution enhanced sea ice concentration: a new algorithm applied to AMSR2 microwave radiometry data Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-30 Jozef Rusin, Thomas Lavergne, Anthony P. Doulgeris, K. Andrea Scott
Passive-microwave sea ice concentration (SIC) algorithms employ different frequencies and polarisations in their operational implementations. Commonly, these algorithms utilise combinations such as 19/37 GHz, yielding reduced measurement uncertainties but at a coarse spatial resolution. Alternatively, these algorithms can solely use 89 GHz, producing a higher spatial resolution but with increased measurement
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Particle tracking in snow avalanches with in situ calibrated inertial measurement units Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-29 Robert Winkler, Michael Neuhauser, Rene Neurauter, Felix Erlacher, Walter Steinkogler, Jan-Thomas Fischer
In the course of an artificially triggered avalanche, a particle tracking procedure is combined with supplementary measurements, including Global Navigation Satellite System (GNSS) positioning, terrestrial laser scanning and Doppler radar measurements. Specifically, an intertial measurement unit is mounted inside a rigid sphere, which is placed in the avalanche track. The sphere is entrained by the
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Weathering alteration in the Antarctic environment as seen in the Miller Range (MIL) 090030 Martian meteorite Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-26 Leire Coloma, Julene Aramendia, Jennifer Huidobro, Iratxe Población, Cristina García-Florentino, Kepa Castro, Gorka Arana, Juan Manuel Madariaga
The analysis of Martian meteorites is a key research to understand the mineralogical composition of Mars. However, they suffer different types of alteration due to the environment where they fall on Earth. These differences should be identified in order to characterize correctly the original Martian compounds. Most of the meteorites found on Earth are collected in Antarctica where the environmental
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Influence of slab depth spatial variability on skier-triggering probability and avalanche size Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-18 Francis Meloche, Louis Guillet, Francis Gauthier, Alexandre Langlois, Johan Gaume
Spatial variability of snowpack properties adds uncertainty in the evaluation of avalanche hazard. We propose a combined mechanical–statistical approach to study how spatial variation of slab depth affects the skier-triggering probability and possible release size. First, we generate multiple slab depth maps on a plane fictional slope based on Gaussian Random Fields (GRF) for a specific set of mean
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Glacier thickness and volume estimation in the Upper Indus Basin using modeling and ground penetrating radar measurements Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-15 Shakil Ahmad Romshoo, Tariq Abdullah, Ummer Ameen, Mustafa Hameed Bhat
In the Himalaya, ice thickness data are limited, and field measurements are even scarcer. In this study, we employed the GlabTop model to estimate ice reserves in the Jhelum (1.9 ± 0.6 km3) and Drass (2.9 ± 0.9 km3) sub-basins of the Upper Indus Basin. Glacier ice thickness in the Jhelum ranged up to 187 ± 56 m with a mean of ~24 ± 7 m, while the Drass showed ice thickness up to 202 ± 60 m, with a
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Updating glacier inventories on the periphery of Antarctica and Greenland using multi-source data Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-08 Xingchen Liu, Lu An, Gang Hai, Huan Xie, Rongxing Li
Melting and calving of glaciers and ice caps in Antarctica and Greenland could potentially contribute significantly to global sea level rise. Updates to existing outlines that provide critical glacier baseline information in both regions could help in the analysis of particular changes in glacier parameters such as area and volume from time-series inventories. Here we synthesize previously established
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Development of a low-temperature immersion microscopy technique for ice research Ann. Glaciol. (IF 2.9) Pub Date : 2024-01-05 Bittor Muniozguren-Arostegi, Patricia Muñoz-Marzagon, Sérgio Henrique Faria
Perennial ice can be studied for many purposes, including paleoclimate records or rheological properties. For most of those purposes, the ice microstructure must be studied, often through optical microscopy. The aim of this work is to assess the viability of immersion microscopy for the study of ice microstructures. It consists of using an oil between the objective lens and the specimen, to increase
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A novel method to visualize liquid distribution in snow: superimposition of MRI and X-ray CT images Ann. Glaciol. (IF 2.9) Pub Date : 2023-12-21 Satoru Yamaguchi, Satoru Adachi, Sojiro Sunako
The relationship between the behavior of water in snow and its microstructure is crucial to improve the prediction of wet snow disasters. X-ray computed tomography (X-ray CT) is frequently used to observe snow microscopically. However, distinguishing between ice and water in the X-ray images is difficult because ice exhibits an X-ray absorption coefficient similar to that of water. In contrast, magnetic
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The role of near-terminus conditions in the ice-flow speed of Upernavik Isstrøm in northwest Greenland Ann. Glaciol. (IF 2.9) Pub Date : 2023-12-11 Kelsey M. Voss, Karen E. Alley, David A. Lilien, Dorthe Dahl-Jensen
Upernavik Isstrøm, the largest contributor to sea-level rise in northwest Greenland, has experienced complex and contrasting ice-flow-speed changes across its five outlets over the last two decades. In this study, we present a detailed remote-sensing analysis of the ice dynamics at Upernavik's outlets from 2000 to 2021 to evaluate the details of these changes. Previous research suggested that the presence
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Ground-penetrating radar as a tool for determining the interface between temperate and cold ice, and snow depth: a case study for Hurd-Johnsons glaciers, Livingston Island, Antarctica Ann. Glaciol. (IF 2.9) Pub Date : 2023-12-07 Unai Letamendia, Francisco Navarro, Beatriz Benjumea
We analyze the internal structure of two polythermal glaciers, Hurd and Johnsons, located on Livingston Island, Antarctica, using 200 and 750 MHz GPR data collected in 2003/04, 2008/09 and 2016/17 field campaigns. Based on the different permittivities of snow and ice, we determined the thickness distribution of the end-of winter snow cover and of the cold ice layer. Their knowledge is fundamental for
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Development of a handheld integrating sphere snow grain sizer (HISSGraS) Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-29 Teruo Aoki, Akihiro Hachikubo, Motoshi Nishimura, Masahiro Hori, Masashi Niwano, Tomonori Tanikawa, Konosuke Sugiura, Ryo Inoue, Satoru Yamaguchi, Sumito Matoba, Rigen Shimada, Hiroshi Ishimoto, Jean-Charles Gallet
We developed a Handheld Integrating Sphere Snow Grain Sizer (HISSGraS) for field use to measure the specific surface area (SSA) of snow. In addition to snow samples, HISSGraS can directly measure snow surfaces and snow pit walls. The basic measurement principle is the same as that of the IceCube SSA instrument. The retrieval algorithm for SSA from reflectance employs two conversion equations formulated
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Spatio-temporal variability in geometry and geodetic mass balance of Jostedalsbreen ice cap, Norway Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-24 Liss M. Andreassen, Benjamin A. Robson, Kamilla H. Sjursen, Hallgeir Elvehøy, Bjarne Kjøllmoen, Jonathan L. Carrivick
The Jostedalsbreen ice cap is mainland Europe's largest ice cap and accommodates 20% (458 km2 in 2019) of the total glacier area of mainland Norway. Jostedalsbreen and its meltwater contribute to global sea-level rise and to local water management, hydropower and tourism economies and livelihoods. In this study, we construct a digital terrain model (DTM) of the ice cap from 1966 aerial photographs
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Modeling the surface mass balance of Penny Ice Cap, Baffin Island, 1959–2099 Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-10 Nicole Schaffer, Luke Copland, Christian Zdanowicz, Regine Hock
Glaciers of Baffin Island and nearby islands of Arctic Canada have experienced rapid mass losses over recent decades. However, projections of loss rates into the 21st century have so far been limited by the availability of model calibration and validation data. In this study, we model the surface mass balance of the largest ice cap on Baffin Island, Penny Ice Cap, since 1959, using an enhanced temperature
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Estimating ice discharge of the Antarctic Peninsula using different ice-thickness datasets Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-07 Kaian Shahateet, Francisco Navarro, Thorsten Seehaus, Johannes J. Fürst, Matthias Braun
The Antarctic Peninsula Ice Sheet (APIS) has become a significant contributor to sea-level rise over recent decades. Accurately estimating the ice discharge from the outlet glaciers of the APIS is crucial to quantify the mass balance of the Antarctic Peninsula. We here compute the ice discharge from the outlet glaciers of the APIS north of 70 ${^\circ }$ S for the five most widely used ice-thickness
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Effects of impurities on the ice microstructure of Monte Perdido Glacier, Central Pyrenees, NE Spain Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-03 Nicolás González-Santacruz, Patricia Muñoz-Marzagon, Miguel Bartolomé, Ana Moreno, Jennifer Huidobro, Sérgio Henrique Faria
Monte Perdido Glacier, located in the central Pyrenees, is one of the southernmost glaciers in Europe. Due to climate change, this glacier is suffering an accelerated mass loss, especially in the last decades. If the current trends persist, this glacier is expected to disappear in the next 50 years. As part of the efforts of the scientific community to increase the knowledge about this glacier, this
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Monitoring the annual geodetic mass balance of Bordu and Sary-Tor glaciers using UAV data Ann. Glaciol. (IF 2.9) Pub Date : 2023-11-03 Lander Van Tricht, Chloë Marie Paice, Oleg Rybak, Victor Popovnin, Rysbek Satylkanov, Philippe Huybrechts
The geodetic mass balance of a glacier corresponds to glacier-wide volume changes, converted to mass changes using density assumptions. It is typically calculated by differencing multi-temporal digital elevation models. In this study, we show how the annual geodetic mass balance of a glacier can be derived from uncrewed aerial vehicle (UAV) data. The presented workflow is applied to two small- to medium-sized
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A method for imaging water transport in soil–snow systems with neutron radiography Ann. Glaciol. (IF 2.9) Pub Date : 2023-10-31 Michael Lombardo, Peter Lehmann, Anders Kaestner, Amelie Fees, Alec Van Herwijnen, Jürg Schweizer
Liquid water at the ground–snow interface is thought to play a crucial role in the release of glide-snow avalanches, which can be massive and threaten infrastructure in alpine regions. Several mechanisms have been postulated to explain the formation of this interfacial water. However, these mechanisms remain poorly understood, in part because suitable measurement techniques are lacking. Here, we demonstrate
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Particle trajectories, velocities, accelerations and rotation rates in snow avalanches Ann. Glaciol. (IF 2.9) Pub Date : 2023-10-31 Michael Neuhauser, Anselm Köhler, Rene Neurauter, Marc S. Adams, Jan-Thomas Fischer
Understanding the dynamics of snow avalanches is crucial for predicting their destructive potential and mobility. To gain insight into avalanche dynamics at a particle level, the AvaNode in-flow sensor system was developed. These synthetic particles, equipped with advanced and affordable sensors such as an inertial measurement unit (IMU) and global navigation satellite system (GNSS), travel with the
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Upper Palaeolithic hunter–gatherer societies in the Basque Country (Iberian Peninsula) in the light of palaeoenvironmental dynamics in the last Glacial Period: cultural adaptations and the use of biotic resources Ann. Glaciol. (IF 2.9) Pub Date : 2023-10-27 Maria-Jose Iriarte-Chiapusso, Miren Ayerdi, Naroa Garcia-Ibaibarriaga, Arantzazu J. Pérez-Fernández, Aritza Villaluenga, Jon Arrizabalaga-Iriarte, Lide Lejonagoitia-Garmendia, Alvaro Arrizabalaga
Upper Palaeolithic archaeological sites in the Basque Country have been excavated for over a century. They have yielded a rich palaeoenvironmental record with zoological and botanical remains that have been obtained in stratigraphic series dated precisely by radiocarbon. This information reveals cyclical environmental changes from climates similar to today to drier and extremely cold conditions, when
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Morphological indexes to describe snow-cover patterns in a high-alpine area Ann. Glaciol. (IF 2.9) Pub Date : 2023-10-25 Lucia Ferrarin, Karsten Schulz, Daniele Bocchiola, Franziska Koch
The spatiotemporal distribution of snow affects hydrological and climatological processes at different scales. Accordingly, quantifying geometric features of snow-cover patterns is important, providing a valuable complement for snow water equivalent (SWE) modelling. This study on satellite-based morphological analysis originally uses two types of geometric indexes: (1) MN, Minkowski numbers (area (MN1)
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The new frontier of microstructural impurity research in polar ice Ann. Glaciol. (IF 2.9) Pub Date : 2023-09-21 Nicolas Stoll, Pascal Bohleber, Remi Dallmayr, Frank Wilhelms, Carlo Barbante, Ilka Weikusat
Deciphering the localisation of solid and dissolved impurities on the micron-scale in glacial ice remains a challenge, but is critical to understand the integrity of ice core records and internal deformation. Here we report on the state-of-the-art in microstructural impurity research by highlighting recent progress in bringing together cryo-Raman spectroscopy and laser ablation inductively coupled
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Seasonal glacier change revealed from the real-time monitoring platform on Baishui River Glacier No.1 in Yulong Snow Mountain, Southeastern Qinghai–Tibet plateau Ann. Glaciol. (IF 2.9) Pub Date : 2023-09-15 Chuya Wang, Yuande Yang, Shijin Wang, Songtao Ai, Yanjun Che, Junhao Wang, Leiyu Li, Fei Li
The mass balance of glaciers requires more detailed and continuous observations to understand their seasonal change in relation to climate. Here, we designed and installed an automated real-time monitoring platform at 4645 m a.s.l. on the Baishui River Glacier No.1 to collect continuous high-resolution observational data, and analyzed the seasonal dynamic from glacier movement and surface mass balance
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Glacier projections sensitivity to temperature-index model choices and calibration strategies Ann. Glaciol. (IF 2.9) Pub Date : 2023-09-11 Lilian Schuster, David R. Rounce, Fabien Maussion
The uncertainty of glacier change projections is largely influenced by glacier models. In this study, we focus on temperature-index mass-balance (MB) models and their calibration. Using the Open Global Glacier Model (OGGM), we examine the influence of different surface-type dependent degree-day factors, temporal climate resolutions (daily, monthly) and downscaling options (temperature lapse rates,
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Snow and ice in the desert: reflections from a decade of connecting cryospheric science with communities in the semiarid Chilean Andes Ann. Glaciol. (IF 2.9) Pub Date : 2023-09-04 Shelley MacDonell, Paloma Núñez Farías, Valentina Aliste, Álvaro Ayala, Camilo Guzmán, Patricio Jofré Díaz, Nicole Schaffer, Simone Schauwecker, Eric A. Sproles, Eduardo Yáñez San Francisco
Citizen science and related engagement programmes have proliferated in recent years throughout the sciences but have been reasonably limited in the cryospheric sciences. In the semiarid Andes we at the Centro de Estudios Avanzados en Zonas Áridas have developed a range of initiatives together with the wider community and stakeholder institutions to improve our understanding of the role snow and ice
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GHOSTly flute music: drumlins, moats and the bed of Thwaites Glacier Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-23 Richard B. Alley, Nick Holschuh, Byron Parizek, Lucas K. Zoet, Kiya Riverman, Atsuhiro Muto, Knut Christianson, Elisabeth Clyne, Sridhar Anandakrishnan, Nathan T. Stevens
Glacier-bed characteristics that are poorly known and modeled are important in projected sea-level rise from ice-sheet changes under strong warming, especially in the Thwaites Glacier drainage of West Antarctica. Ocean warming may induce ice-shelf thinning or loss, or thinning of ice in estuarine zones, reducing backstress on grounded ice. Models indicate that, in response, more-nearly-plastic beds
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Changes in surface mass balance and summer temperature from 1961–1990 to 1991–2020 for 37 glaciers with long records Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-18 Roger J. Braithwaite, Philip D. Hughes
Recent satellite measurements of glacier mass balance show mountain glaciers all over the world had generally negative mass balances in the first decades of the 21st century. We analyse archived data for surface mass balance and summer temperature for 37 Northern Hemisphere glaciers with data for 1961–2020. We compare mean annual balances for 1961–90 and 1991–2020, and for 25 glaciers explain the changes
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Dynamic time warping to quantify age distortion in firn cores impacted by melt processes Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-17 Cedric J. Hagen, Joel T. Harper
As warming intensifies across the Greenland ice sheet, an increasing number of shallow coring and radar studies are targeting the melt-impacted firn column to investigate meltwater processes. Highly inhomogeneous infiltration and refreezing, however, redistributes mass, distorting age–depth relationships and confounding comparisons between different cores. Here, we utilize a dynamic time warping algorithm
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Impacts of tidewater glacier advance on iceberg habitat Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-17 Lynn M. Kaluzienski, Jason M. Amundson, Jamie M. Womble, Andrew K. Bliss, Linnea E. Pearson
Icebergs in proglacial fjords serve as pupping, resting and molting habitat for some of the largest seasonal aggregations of harbor seals (Phoca vitulina richardii) in Alaska. One of the largest aggregations in Southeast Alaska occurs in Johns Hopkins Inlet, Glacier Bay National Park, where up to 2000 seals use icebergs produced by Johns Hopkins Glacier. Like other advancing tidewater glaciers, the
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Geological and glacial-hydrologic controls on chemical weathering in the subglacial environment Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-14 Joseph A. Graly, Soroush Rezvanbehbahani
A comparison of major ion chemistry of subglacial boreholes and discharging subglacial waters reveals three fundamentally different glacier hydrochemical regimes. Subglacial waters from alpine glaciers have chemistry distinct from the subglacial waters of Greenland or Antarctica. Greenland and Antarctica also differ fundamentally from each other, with Greenland Ice Sheet waters, at least during the
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Initial snow-ice formation on a laboratory scale Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-14 Vasiola Zhaka, Robert Bridges, Kaj Riska, Axel Hagermann, Andrzej Cwirzen
Snow ice (SI) forms from freezing wet snow, known as slush, and contributes to the thickness of level and brash ice. However, the mechanism of snow-slush-snow ice transformation has not been extensively investigated to date, despite the difference in the freezing rate of slush in comparison with water is important for estimating the ice thickness. In this study, we examined the growth of initial congelation
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Topographic modulation of outlet glaciers in Greenland: a review Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-14 Ginny Catania, Denis Felikson
Bed topography is a critical parameter for determining the modern-day and future dynamics of ice sheets and their outlet glaciers. This is because the topography controls the state of stress for glaciers. At glacier termini, topography can influence the timing of terminus retreat by controlling access to warm ocean waters and/or by influencing the ability of a glacier terminus to retreat over bed bumps
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The influence of inter-annual temperature variability on the Greenland Ice Sheet volume Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-09 Mikkel Lauritzen, Guðfinna Aðalgeirsdóttir, Nicholas Rathmann, Aslak Grinsted, Brice Noël, Christine S. Hvidberg
The Greenland Ice Sheet has become an increasingly larger contributor to sea level rise in the past two decades and is projected to continue to lose mass. Climate variability is expected to increase under future warming, but the effect of climate variability on the Greenland Ice Sheet volume is poorly understood and is adding to the uncertainty of the projected mass loss. Here we quantify the influence
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Sources of seasonal sea-ice bias for CMIP6 models in the Hudson Bay Complex Ann. Glaciol. (IF 2.9) Pub Date : 2023-08-03 Alex D. Crawford, Erica Rosenblum, Jennifer V. Lukovich, Julienne C. Stroeve
The seasonal ice-free period in the Hudson Bay Complex (HBC) has grown longer in recent decades in response to warming, both from progressively earlier sea-ice retreat in summer and later sea-ice advance in fall. Such changes disrupt the HBC ecosystem and ice-based human activities. In this study, we compare 102 simulations from 37 models participating in phase 6 of the Coupled Model Intercomparison
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Stress measurements in the weak layer during snow stability tests Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-27 Silke Griesser, Christine Pielmeier, Håvard Boutera Toft, Ingrid Reiweger
The snow compression test is a snow stability test where an isolated column of snow is progressively loaded by tapping on it to induce failure in a possible weak layer. The test result provides valuable information about the propensity of failure initiation within the snowpack. However, different persons might tap with different force and thus reduce the reproducibility of the test results. The aim
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Glacier retreat, dynamics and bed overdeepenings of Parkachik Glacier, Ladakh Himalaya, India Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-18 Ajay Singh Rana, Pankaj Kunmar, Manish Mehta, Vinit Kumar
This study describes the morphological and dynamic changes of Parkachik Glacier, Suru River valley, Ladakh Himalaya, India. We used medium-resolution satellite images; CORONA KH-4, Landsat and Sentinel-2A from 1971–2021, and field surveys between 2015 and 2021. In addition, we used the laminar flow-based Himalayan Glacier Thickness Mapper and provide results for recent margin fluctuations, surface
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Glide-snow avalanche characteristics at different timescales extracted from time-lapse photography Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-11 Amelie Fees, Alec van Herwijnen, Moritz Altenbach, Michael Lombardo, Jürg Schweizer
Glide-snow avalanches release due to a loss of friction at the snow–ground interface, which can result in large avalanches that endanger infrastructure in alpine regions. The underlying processes are still relatively poorly understood, in part due to the limited data available on glide processes. Here, we introduce a pixel-based algorithm to detect glide cracks in time-lapse photographs under changing
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Inequalities of ice loss: a framework for addressing sociocryospheric change Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-11 Mark Carey, Holly Moulton
Cryospheric change occurs in unequal spaces. Societies living near ice are divided by race, class, gender, geography, politics and other factors. Consequently, impacts of ice loss are not shared equally, and everyone experiences cryospheric changes differently. Responsibility for recent ice loss is also driven by a relatively small portion of humanity: those who emit the most greenhouse gases. Additionally
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Strategies to build a positive and inclusive Antarctic field work environment Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-11 Marianne S. Karplus, Tun Jan Young, Sridhar Anandakrishnan, Jeremy N. Bassis, Elizabeth H. Case, Anna J. Crawford, Anne Gold, Leilani Henry, Jonathan Kingslake, Asmara A. Lehrmann, Patricia A. Montaño, Erin C. Pettit, Ted A. Scambos, Elizabeth M. Sheffield, Emma C. Smith, Margie Turrin, Julia S. Wellner
To increase inclusivity, diversity, equity and accessibility in Antarctic science, we must build more positive and inclusive Antarctic field work environments. The International Thwaites Glacier Collaboration (ITGC) has engaged in efforts to contribute to that goal through a variety of activities since 2018, including creating an open-access ‘Field and Ship Best Practices’ guide, engaging in pre-field
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C and K band microwave penetration into snow on sea ice studied with off-the-shelf tank radars Ann. Glaciol. (IF 2.9) Pub Date : 2023-07-06 Arttu Jutila, Christian Haas
Snow cover on sea ice poses a challenge for radar measurements as microwave penetration into snow is not yet fully understood. In this study, the aim is to investigate microwave penetration into snow on Arctic sea ice using commercial C (6 GHz) and K (26 GHz) band tank radars. Nadir-looking radar measurements collected at nine study locations over first-year and multiyear landfast sea ice in the Lincoln
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Progress toward globally complete frontal ablation estimates of marine-terminating glaciers Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-29 William Kochtitzky, Luke Copland, Wesley Van Wychen, Regine Hock, David R. Rounce, Hester Jiskoot, Ted A. Scambos, Mathieu Morlighem, Michalea King, Leo Cha, Luke Gould, Paige-Marie Merrill, Andrey Glazovsky, Romain Hugonnet, Tazio Strozzi, Brice Noël, Francisco Navarro, Romain Millan, Julian A. Dowdeswell, Alison Cook, Abigail Dalton, Shfaqat Khan, Jacek Jania
Knowledge of frontal ablation from marine-terminating glaciers (i.e., mass lost at the calving face) is critical for constraining glacier mass balance, improving projections of mass change, and identifying the processes that govern frontal mass loss. Here, we discuss the challenges involved in computing frontal ablation and the unique issues pertaining to both glaciers and ice sheets. Frontal ablation
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The singing firn Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-29 Julien Chaput, Richard C. Aster, Marianne Karplus
Antarctic firn presents an exotic seismological environment in which the behaviors of propagating waves can be significantly at odds with those in other Earth media. We present a condensed view of the nascent field of ambient noise seismology in Antarctic firn-covered media, and highlight multiple unusual and information-rich observations framed through the lens of the firn's important role as a buffer
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Two decades of mass-balance observations on Aldegondabreen, Spitsbergen: interannual variability and sensitivity to climate change Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-23 Anton Terekhov, Uliana Prokhorova, Sergey Verkulich, Vasiliy Demidov, Olga Sidorova, Mikhail Anisimov, Kseniia Romashova
Aldegondabreen is a relatively small (5.3 km2) land-terminating glacier located in Nordeskiöld Land of Svalbard, ~10 km southwest of Barentsburg. Cumulative mass balance during 2002–20 equalled −21.79 m w.e., which corresponds to 37% of the total mass loss. The annual mass balance (Ba) varied from −0.24 to −2.19 m w.e., while the winter mass balance (Bw) ranged between 0.36 and 0.85 m w.e. Ba and Bw
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Diffuse debris entrainment in glacier, lab and model environments Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-21 Alan W. Rempel, Dougal D. Hansen, Luke K. Zoet, Colin R. Meyer
Small quantities of liquid water lining triple junctions in polycrystalline glacier ice form connected vein networks that enable material exchange with underlying basal environments. Diffuse debris concentrations commonly observed in ice marginal regions might be attributed to this mechanism. Following recent cryogenic ring-shear experiments, we observed emplacement along grain boundaries of loess
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Steep ice – progress and future challenges in research on ice cliffs Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-08 Jakob F. Steiner, Pascal Buri, Jakob Abermann, Rainer Prinz, Lindsey Nicholson
Ice cliffs are features along ice sheet margins, along tropical mountain glaciers, at termini of mountain glaciers and on debris-covered glacier tongues, that have received scattered attention in literature. They cover small relative areas of glacier or margin surface respectively, but have been involved in two apparent anomalies. On the one hand, they have been identified as potential hotspots of
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Using a Web Map Service to map Little Ice Age glacier extents at regional scales Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-02 Johannes Reinthaler, Frank Paul
Extending the record of glacier area changes into the past improves our understanding of climate change impacts. Although analogue maps showing historic glacier extents are abundant, digital outlines from before the satellite era are sparse as the digitisation of moraines and trimlines on freely available satellite images is challenging. With the now available very high-resolution images provided by
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Glacier monitoring using real-aperture 94 GHz radar Ann. Glaciol. (IF 2.9) Pub Date : 2023-06-01 William D. Harcourt, Duncan A. Robertson, David G. Macfarlane, Brice R. Rea, Matteo Spagnolo, Douglas I. Benn, Mike R. James
Close-range sensors are employed to observe glaciological processes that operate over short timescales (e.g. iceberg calving, glacial lake outburst floods, diurnal surface melting). However, under poor weather conditions optical instruments fail while the operation of radar systems below 17 GHz do not have sufficient angular resolution to map glacier surfaces in detail. This letter reviews the potential
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Persistent overcut regions dominate the terminus morphology of a rapidly melting tidewater glacier Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-29 Nicole Abib, David A. Sutherland, Jason M. Amundson, Dan Duncan, Emily F. Eidam, Rebecca H. Jackson, Christian Kienholz, Mathieu Morlighem, Roman J. Motyka, Jonathan D. Nash, Bridget Ovall, Erin C. Pettit
Frontal ablation, the combination of submarine melting and iceberg calving, changes the geometry of a glacier's terminus, influencing glacier dynamics, the fate of upwelling plumes and the distribution of submarine meltwater input into the ocean. Directly observing frontal ablation and terminus morphology below the waterline is difficult, however, limiting our understanding of these coupled ice–ocean
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Using video detection of snow surface movements to estimate weak layer crack propagation speeds Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-22 Ron Simenhois, Karl W. Birkeland, Johan Gaume, Alec van Herwijnen, Bastian Bergfeld, Bertil Trottet, Ethan Greene
Dry-snow slab avalanches release due to crack propagation in a weak snow layer under a cohesive snow slab. Crack propagation speeds can provide insights into the potential size of avalanches and inform fracture and avalanche release models. Despite their importance, slope-scale crack speed measurements from real avalanches are limited. Further, most existing slope-scale measurements utilize the appearance
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A tale of two events: Arctic rain-on-snow meteorological drivers Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-10 Jessica Voveris, Mark Serreze
Arctic rain-on-snow (ROS) events can have significant impacts on Arctic wildlife and socio-economic systems. This study addresses the meteorology of two different Arctic ROS events. The first, occurring near Nuuk, Greenland, generated significant impacts, including slush avalanches. The second, less severe, event occurred within the community of Iqaluit, Nunavut, Canada. This research utilizes atmospheric
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The bimodality of the East Siberian fast ice extent: mechanisms and changes Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-08 Valeria Selyuzhenok, Thomas Krumpen, Denis Demchev, Rüdiger Gerdes, Christian Haas
Using operational sea-ice maps, we provide first insight into the seasonal evolution of fast ice in the East Siberian Sea for the period between 1999 and 2021. The fast ice season tends to start later by 4.7 d per decade and to end earlier by 9.7 d per decade. As a result, there is a trend towards a shorter length of fast ice season by 2 weeks per decade. The analysis of air temperatures indicates
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Mechanism for the subglacial formation of cryogenic brines Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-08 Sarah U. Neuhaus, Slawek M. Tulaczyk
Cryogenic brines are under-studied, despite the fact that they may contain information about past ice-sheet behavior. Cryogenic brines form through cryoconcentration of seawater, although the specific setting and mechanism of formation have been debated. Previous conceptual models of brine formation require seawater isolation from the ocean in a closed basin experiencing freezing. We propose instead
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Change at 85 degrees south: Shackleton Glacier region proglacial lakes from 1960 to 2020 Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-05 Melisa A. Diaz, Christopher B. Gardner, David H. Elliot, Byron J. Adams, W. Berry Lyons
Over the last two decades, anomalous warming events have been observed in coastal Antarctic regions. While these events have been documented in the Ross Sea sector, the Antarctic interior is believed to have been buffered from warming. In this work, we present data from lakes located near Mt. Heekin and Thanksgiving Valley (~85° S) along the Shackleton Glacier, which are believed to be the southern-most
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The effect of low temperature on the Raman spectra of calcium-rich sulfates on Mars Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-03 Jennifer Huidobro, Julene Aramendia, Gorka Arana, Elisabeth M. Hausrath, Juan Manuel Madariaga
Raman spectra (532 nm diode laser) of gypsum, syngenite and görgeyite powders were studied from 273 to 83 K every −10 K. Although it was found that not all the Raman peaks are temperature-sensitive, the effect of temperature on the Raman signal of some bands was modelled. It was observed that the main bands of the three sulfates shift toward higher wavenumbers as temperature decreases. The strengthening
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Quantifying dissolution rates of Antarctic icebergs in open water Ann. Glaciol. (IF 2.9) Pub Date : 2023-05-03 Olav Orheim, A. Barry Giles, T. H. (Jo) Jacka, Geir Moholdt
At any one time 130 000 icebergs are afloat in the Southern Ocean; 97% of these are too small to be registered in current satellite-based databases, yet the melting of these small icebergs provides a major input to the Southern Ocean. We use a unique set of visual size observations of 53 000 icebergs in the South Atlantic Ocean, the SCAR International Iceberg Database, to derive average iceberg dissolution
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Surface mass balance monitoring of the peripheral glaciers of the Antarctic Peninsula in the context of regional climate change Ann. Glaciol. (IF 2.9) Pub Date : 2023-04-27 Francisco Navarro, Cayetana Recio-Blitz, Ricardo Rodríguez-Cielos, Jaime Otero, Kaian Shahateet, Eva De Andrés, María I. Corcuera, Unai Letamendia, José M. Muñoz-Hermosilla
During the second half of the 20th century, the Antarctic Peninsula region has undergone a long and sustained warming period, followed by a shorter but also sustained cooling period, and then a very recent return to warming conditions. All of these have profoundly impacted the glaciers peripheral to the Antarctic Peninsula. This paper focuses on the analysis of the surface mass balance monitoring of
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Characterising sediment thickness beneath a Greenlandic outlet glacier using distributed acoustic sensing: preliminary observations and progress towards an efficient machine learning approach Ann. Glaciol. (IF 2.9) Pub Date : 2023-04-24 Adam D. Booth, Poul Christoffersen, Andrew Pretorius, Joseph Chapman, Bryn Hubbard, Emma C. Smith, Sjoerd de Ridder, Andy Nowacki, Bradley Paul Lipovsky, Marine Denolle
Distributed Acoustic Sensing (DAS) is increasingly recognised as a valuable tool for glaciological seismic applications, although analysing the large data volumes generated in acquisitions poses computational challenges. We show the potential of active-source DAS to image and characterise subglacial sediment beneath a fast-flowing Greenlandic outlet glacier, estimating the thickness of sediment layers
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Deriving a year 2000 glacier inventory for New Zealand from the existing 2016 inventory Ann. Glaciol. (IF 2.9) Pub Date : 2023-04-20 Frank Paul, Sabine Baumann, Brian Anderson, Philipp Rastner
Due to adverse snow and cloud conditions, only a few inventories are available for the maritime glaciers in New Zealand. These are difficult to compare as different approaches and baseline data have been used to create them. In consequence, glacier fluctuations in New Zealand over the past two decades are only known for a few glaciers based on field observations. Here we present the results of a new
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The ice dynamic and melting response of Pine Island Ice Shelf to calving Ann. Glaciol. (IF 2.9) Pub Date : 2023-04-20 Alexander T. Bradley, Jan De Rydt, David T. Bett, Pierre Dutrieux, Paul R. Holland
Sea level rise contributions from the Pine Island Glacier (PIG) are strongly modulated by the backstress that its floating extension – Pine Island Ice Shelf (PIIS) – exerts on the adjoining grounded ice. The front of PIIS has recently retreated significantly via calving, and satellite and theoretical analyses have suggested further retreat is inevitable. As well as inducing an instantaneous increase
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Advances in understanding subglacial meltwater drainage from past ice sheets Ann. Glaciol. (IF 2.9) Pub Date : 2023-04-17 Lauren M. Simkins, Sarah L. Greenwood, Monica C. M. Winsborrow, Lilja R. Bjarnadóttir, Allison P. Lepp
Meltwater drainage beneath ice sheets is a fundamental consideration for understanding ice–bed conditions and bed-modulated ice flow, with potential impacts on terminus behavior and ice-shelf mass balance. While contemporary observations reveal the presence of basal water movement in the subglacial environment and inferred styles of drainage, the geological record of former ice sheets, including sediments