Articles | Volume 13, issue 3
https://doi.org/10.5194/tc-13-827-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-13-827-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Mar 2019
Research article |
| 07 Mar 2019
| 07 Mar 2019
Pervasive cold ice within a temperate glacier – implications for glacier thermal regimes, sediment transport and foreland geomorphology
Benedict T. I. Reinardy
CORRESPONDING AUTHOR
Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
Adam D. Booth
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
Anna L. C. Hughes
Department of Earth Sciences, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5020, Norway
now at: School of Environment, Education and Development, University of Manchester, Manchester, UK
Clare M. Boston
Department of Geography, University of Portsmouth, Portsmouth, PO1 3HE, UK
Henning Åkesson
Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
Jostein Bakke
Department of Earth Sciences, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5020, Norway
Atle Nesje
Department of Earth Sciences, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5020, Norway
Rianne H. Giesen
Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, 3508 TA, the Netherlands
now at: HydroLogic Research, Delft, the Netherlands
Danni M. Pearce
Department of Biological and Environmental Sciences, University of Hertfordshire, Hatfield, AL10 9AB, UK
Related authors
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Karina von Schuckmann, Lorena Moreira, Mathilde Cancet, Flora Gues, Emmanuelle Autret, Jonathan Baker, Clément Bricaud, Romain Bourdalle-Badie, Lluis Castrillo, Lijing Cheng, Frederic Chevallier, Daniele Ciani, Alvaro de Pascual-Collar, Vincenzo De Toma, Marie Drevillon, Claudia Fanelli, Gilles Garric, Marion Gehlen, Rianne Giesen, Kevin Hodges, Doroteaciro Iovino, Simon Jandt-Scheelke, Eric Jansen, Melanie Juza, Ioanna Karagali, Thomas Lavergne, Simona Masina, Ronan McAdam, Audrey Minière, Helen Morrison, Tabea Rebekka Panteleit, Andrea Pisano, Marie-Isabelle Pujol, Ad Stoffelen, Sulian Thual, Simon Van Gennip, Pierre Veillard, Chunxue Yang, and Hao Zuo
State Planet, 4-osr8, 1, https://doi.org/10.5194/sp-4-osr8-1-2024, https://doi.org/10.5194/sp-4-osr8-1-2024, 2024
Karina von Schuckmann, Lorena Moreira, Mathilde Cancet, Flora Gues, Emmanuelle Autret, Ali Aydogdu, Lluis Castrillo, Daniele Ciani, Andrea Cipollone, Emanuela Clementi, Gianpiero Cossarini, Alvaro de Pascual-Collar, Vincenzo De Toma, Marion Gehlen, Rianne Giesen, Marie Drevillon, Claudia Fanelli, Kevin Hodges, Simon Jandt-Scheelke, Eric Jansen, Melanie Juza, Ioanna Karagali, Priidik Lagemaa, Vidar Lien, Leonardo Lima, Vladyslav Lyubartsev, Ilja Maljutenko, Simona Masina, Ronan McAdam, Pietro Miraglio, Helen Morrison, Tabea Rebekka Panteleit, Andrea Pisano, Marie-Isabelle Pujol, Urmas Raudsepp, Roshin Raj, Ad Stoffelen, Simon Van Gennip, Pierre Veillard, and Chunxue Yang
State Planet, 4-osr8, 2, https://doi.org/10.5194/sp-4-osr8-2-2024, https://doi.org/10.5194/sp-4-osr8-2-2024, 2024
Siobhan F. Killingbeck, Anja Rutishauser, Martyn J. Unsworth, Ashley Dubnick, Alison S. Criscitiello, James Killingbeck, Christine F. Dow, Tim Hill, Adam D. Booth, Brittany Main, and Eric Brossier
The Cryosphere, 18, 3699–3722, https://doi.org/10.5194/tc-18-3699-2024, https://doi.org/10.5194/tc-18-3699-2024, 2024
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A subglacial lake was proposed to exist beneath Devon Ice Cap in the Canadian Arctic based on the analysis of airborne data. Our study presents a new interpretation of the subglacial material beneath the Devon Ice Cap from surface-based geophysical data. We show that there is no evidence of subglacial water, and the subglacial lake has likely been misidentified. Re-evaluation of the airborne data shows that overestimation of a critical processing parameter has likely occurred in prior studies.
Mette Kusk Gillespie, Liss Marie Andreassen, Matthias Huss, Simon de Villiers, Kamilla Hauknes Sjursen, Jostein Aasen, Jostein Bakke, Jan Magne Cederstrøm, Halgeir Elvehøy, Bjarne Kjøllmoen, Even Loe, Marte Meland, Kjetil Melvold, Sigurd Daniel Nerhus, Torgeir Opeland Røthe, Eivind Nagel Wilhelm Støren, Kåre Øst, and Jacob Clement Yde
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-167, https://doi.org/10.5194/essd-2024-167, 2024
Revised manuscript accepted for ESSD
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Here we present an extensive new ice thickness dataset from Jostedalsbreen ice cap which will serve as baseline for future studies of regional climate-induced change. Results show that Jostedalsbreen currently (~2020) has a maximum ice thickness of ~630 m, a mean ice thickness of 154 m ± 22 m and an ice volume of 70.6 ± 10.2 km3. Ice of less than 50 m thickness covers two narrow regions of the ice cap, and Jostedalsbreen is likely to separate into three smaller ice caps in a warming climate.
Tancrède P. M. Leger, Christopher D. Clark, Carla Huynh, Sharman Jones, Jeremy C. Ely, Sarah L. Bradley, Christiaan Diemont, and Anna L. C. Hughes
Clim. Past, 20, 701–755, https://doi.org/10.5194/cp-20-701-2024, https://doi.org/10.5194/cp-20-701-2024, 2024
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Projecting the future evolution of the Greenland Ice Sheet is key. However, it is still under the influence of past climate changes that occurred over thousands of years. This makes calibrating projection models against current knowledge of its past evolution (not yet achieved) important. To help with this, we produced a new Greenland-wide reconstruction of ice sheet extent by gathering all published studies dating its former retreat and by mapping its past margins at the ice sheet scale.
Mathilde B. Sørensen, Torbjørn Haga, and Atle Nesje
Nat. Hazards Earth Syst. Sci., 23, 1577–1592, https://doi.org/10.5194/nhess-23-1577-2023, https://doi.org/10.5194/nhess-23-1577-2023, 2023
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Most Norwegian landslides are triggered by rain or snowmelt, and earthquakes have not been considered a relevant trigger mechanism even though some cases have been reported. Here we systematically search historical documents and databases and find 22 landslides induced by eight large Norwegian earthquakes. The Norwegian earthquakes induce landslides at distances and over areas that are much larger than those found for global datasets.
Jonathan P. Conway, Jakob Abermann, Liss M. Andreassen, Mohd Farooq Azam, Nicolas J. Cullen, Noel Fitzpatrick, Rianne H. Giesen, Kirsty Langley, Shelley MacDonell, Thomas Mölg, Valentina Radić, Carleen H. Reijmer, and Jean-Emmanuel Sicart
The Cryosphere, 16, 3331–3356, https://doi.org/10.5194/tc-16-3331-2022, https://doi.org/10.5194/tc-16-3331-2022, 2022
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We used data from automatic weather stations on 16 glaciers to show how clouds influence glacier melt in different climates around the world. We found surface melt was always more frequent when it was cloudy but was not universally faster or slower than under clear-sky conditions. Also, air temperature was related to clouds in opposite ways in different climates – warmer with clouds in cold climates and vice versa. These results will help us improve how we model past and future glacier melt.
Thomas Frank, Henning Åkesson, Basile de Fleurian, Mathieu Morlighem, and Kerim H. Nisancioglu
The Cryosphere, 16, 581–601, https://doi.org/10.5194/tc-16-581-2022, https://doi.org/10.5194/tc-16-581-2022, 2022
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The shape of a fjord can promote or inhibit glacier retreat in response to climate change. We conduct experiments with a synthetic setup under idealized conditions in a numerical model to study and quantify the processes involved. We find that friction between ice and fjord is the most important factor and that it is possible to directly link ice discharge and grounding line retreat to fjord topography in a quantitative way.
Trude Eidhammer, Adam Booth, Sven Decker, Lu Li, Michael Barlage, David Gochis, Roy Rasmussen, Kjetil Melvold, Atle Nesje, and Stefan Sobolowski
Hydrol. Earth Syst. Sci., 25, 4275–4297, https://doi.org/10.5194/hess-25-4275-2021, https://doi.org/10.5194/hess-25-4275-2021, 2021
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We coupled a detailed snow–ice model (Crocus) to represent glaciers in the Weather Research and Forecasting (WRF)-Hydro model and tested it on a well-studied glacier. Several observational systems were used to evaluate the system, i.e., satellites, ground-penetrating radar (used over the glacier for snow depth) and stake observations for glacier mass balance and discharge measurements in rivers from the glacier. Results showed improvements in the streamflow projections when including the model.
Alex Brisbourne, Bernd Kulessa, Thomas Hudson, Lianne Harrison, Paul Holland, Adrian Luckman, Suzanne Bevan, David Ashmore, Bryn Hubbard, Emma Pearce, James White, Adam Booth, Keith Nicholls, and Andrew Smith
Earth Syst. Sci. Data, 12, 887–896, https://doi.org/10.5194/essd-12-887-2020, https://doi.org/10.5194/essd-12-887-2020, 2020
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Melting of the Larsen C Ice Shelf in Antarctica may lead to its collapse. To help estimate its lifespan we need to understand how the ocean can circulate beneath. This requires knowledge of the geometry of the sub-shelf cavity. New and existing measurements of seabed depth are integrated to produce a map of the ocean cavity beneath the ice shelf. The observed deep seabed may provide a pathway for circulation of warm ocean water but at the same time reduce rapid tidal melt at a critical location.
Siobhan F. Killingbeck, Adam D. Booth, Philip W. Livermore, C. Richard Bates, and Landis J. West
Solid Earth, 11, 75–94, https://doi.org/10.5194/se-11-75-2020, https://doi.org/10.5194/se-11-75-2020, 2020
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This paper presents MuLTI-TEM, a Bayesian inversion tool for inverting TEM data with independent depth constraints to provide statistical properties and uncertainty analysis of the resistivity profile with depth. MuLTI-TEM is highly versatile, being compatible with most TEM survey designs, ground-based or airborne, along with the depth constraints being provided from any external source. Here, we present an application of MuLTI-TEM to characterise the subglacial water under a Norwegian glacier.
Raymond S. Bradley and Jostein Bakke
Clim. Past, 15, 1665–1676, https://doi.org/10.5194/cp-15-1665-2019, https://doi.org/10.5194/cp-15-1665-2019, 2019
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We review paleoceanographic and paleoclimatic records from the northern North Atlantic to assess the nature of climatic conditions at 4.2 ka BP. There was a general decline in temperatures after ~ 5 ka BP, which led to the onset of neoglaciation. Although a few records do show a distinct anomaly around 4.2 ka BP (associated with a glacial advance), this is not widespread and we interpret it as a local manifestation of the overall climatic deterioration that characterized the late Holocene.
Nadine Steiger, Kerim H. Nisancioglu, Henning Åkesson, Basile de Fleurian, and Faezeh M. Nick
The Cryosphere, 12, 2249–2266, https://doi.org/10.5194/tc-12-2249-2018, https://doi.org/10.5194/tc-12-2249-2018, 2018
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We use an ice flow model to reconstruct the retreat of Jakobshavn Isbræ since 1850, forced by increased ocean warming and calving. Fjord geometry governs locations of rapid retreat: narrow and shallow areas act as intermittent pinning points for decades, followed by delayed rapid retreat without additional climate warming. These areas may be used to locate potential moraine buildup. Evidently, historic retreat and geometric influences have to be analyzed individually for each glacier system.
Suzanne L. Bevan, Adrian Luckman, Bryn Hubbard, Bernd Kulessa, David Ashmore, Peter Kuipers Munneke, Martin O'Leary, Adam Booth, Heidi Sevestre, and Daniel McGrath
The Cryosphere, 11, 2743–2753, https://doi.org/10.5194/tc-11-2743-2017, https://doi.org/10.5194/tc-11-2743-2017, 2017
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Five 90 m boreholes drilled into an Antarctic Peninsula ice shelf show units of ice that are denser than expected and must have formed from refrozen surface melt which has been buried and transported downstream. We used surface flow speeds and snow accumulation rates to work out where and when these units formed. Results show that, as well as recent surface melt, a period of strong melt occurred during the 18th century. Surface melt is thought to be a factor in causing recent ice-shelf break-up.
Peter Kuipers Munneke, Daniel McGrath, Brooke Medley, Adrian Luckman, Suzanne Bevan, Bernd Kulessa, Daniela Jansen, Adam Booth, Paul Smeets, Bryn Hubbard, David Ashmore, Michiel Van den Broeke, Heidi Sevestre, Konrad Steffen, Andrew Shepherd, and Noel Gourmelen
The Cryosphere, 11, 2411–2426, https://doi.org/10.5194/tc-11-2411-2017, https://doi.org/10.5194/tc-11-2411-2017, 2017
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How much snow falls on the Larsen C ice shelf? This is a relevant question, because this ice shelf might collapse sometime this century. To know if and when this could happen, we found out how much snow falls on its surface. This was difficult, because there are only very few measurements. Here, we used data from automatic weather stations, sled-pulled radars, and a climate model to find that melting the annual snowfall produces about 20 cm of water in the NE and over 70 cm in the SW.
Henning Åkesson, Kerim H. Nisancioglu, Rianne H. Giesen, and Mathieu Morlighem
The Cryosphere, 11, 281–302, https://doi.org/10.5194/tc-11-281-2017, https://doi.org/10.5194/tc-11-281-2017, 2017
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We present simulations of the history of Hardangerjøkulen ice cap in southern Norway using a dynamical ice sheet model. From mid-Holocene ice-free conditions 4000 years ago, Hardangerjøkulen grows nonlinearly in response to a linear climate forcing, reaching maximum extent during the Little Ice Age (~ 1750 AD). The ice cap exhibits spatially asymmetric growth and retreat and is highly sensitive to climate change. Our results call for reassessment of glacier reconstructions from proxy records.
Rune Strand Ødegård, Atle Nesje, Ketil Isaksen, Liss Marie Andreassen, Trond Eiken, Margit Schwikowski, and Chiara Uglietti
The Cryosphere, 11, 17–32, https://doi.org/10.5194/tc-11-17-2017, https://doi.org/10.5194/tc-11-17-2017, 2017
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Despite numerous spectacular archaeological discoveries worldwide related to melting ice, governing processes related to ice patch development are still largely unexplored. We present new results from Jotunheimen in central southern Norway showing that the Juvfonne ice patch has existed continuously since ca. 7600 cal years BP. This is the oldest dating of ice in mainland Norway. Moss mats along the margin of Juvfonne in 2014 were covered by the expanding ice patch about 2000 years ago.
H. S. Sundqvist, D. S. Kaufman, N. P. McKay, N. L. Balascio, J. P. Briner, L. C. Cwynar, H. P. Sejrup, H. Seppä, D. A. Subetto, J. T. Andrews, Y. Axford, J. Bakke, H. J. B. Birks, S. J. Brooks, A. de Vernal, A. E. Jennings, F. C. Ljungqvist, K. M. Rühland, C. Saenger, J. P. Smol, and A. E. Viau
Clim. Past, 10, 1605–1631, https://doi.org/10.5194/cp-10-1605-2014, https://doi.org/10.5194/cp-10-1605-2014, 2014
Related subject area
Discipline: Glaciers | Subject: Subglacial Processes
Multi-scale variations of subglacial hydro-mechanical conditions at Kongsvegen glacier, Svalbard
Geothermal heat source estimations through ice flow modelling at Mýrdalsjökull, Iceland
Impact of shallow sills on circulation regimes and submarine melting in glacial fjords
Differential impact of isolated topographic bumps on ice sheet flow and subglacial processes
Channelized, distributed, and disconnected: spatial structure and temporal evolution of the subglacial drainage under a valley glacier in the Yukon
Persistent, extensive channelized drainage modeled beneath Thwaites Glacier, West Antarctica
Long-period variability in ice-dammed glacier outburst floods due to evolving catchment geometry
Seasonal evolution of basal environment conditions of Russell sector, West Greenland, inverted from satellite observation of surface flow
Brief communication: Heterogenous thinning and subglacial lake activity on Thwaites Glacier, West Antarctica
Subglacial permafrost dynamics and erosion inside subglacial channels driven by surface events in Svalbard
Quantification of seasonal and diurnal dynamics of subglacial channels using seismic observations on an Alpine glacier
Glaciohydraulic seismic tremors on an Alpine glacier
Airborne radionuclides and heavy metals in high Arctic terrestrial environment as the indicators of sources and transfers of contamination
Coline Bouchayer, Ugo Nanni, Pierre-Marie Lefeuvre, John Hult, Louise Steffensen Schmidt, Jack Kohler, François Renard, and Thomas V. Schuler
The Cryosphere, 18, 2939–2968, https://doi.org/10.5194/tc-18-2939-2024, https://doi.org/10.5194/tc-18-2939-2024, 2024
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We explore the interplay between surface runoff and subglacial conditions. We focus on Kongsvegen glacier in Svalbard. We drilled 350 m down to the glacier base to measure water pressure, till strength, seismic noise, and glacier surface velocity. In the low-melt season, the drainage system adapted gradually, while the high-melt season led to a transient response, exceeding drainage capacity and enhancing sliding. Our findings contribute to discussions on subglacial hydro-mechanical processes.
Alexander H. Jarosch, Eyjólfur Magnússon, Krista Hannesdóttir, Joaquín M. C. Belart, and Finnur Pálsson
The Cryosphere, 18, 2443–2454, https://doi.org/10.5194/tc-18-2443-2024, https://doi.org/10.5194/tc-18-2443-2024, 2024
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Geothermally active regions beneath glaciers not only influence local ice flow as well as the mass balance of glaciers but also control changes of subglacial water reservoirs and possible subsequent glacier lake outburst floods. In Iceland, such outburst floods impose danger to people and infrastructure and are therefore monitored. We present a novel computer-simulation-supported method to estimate the activity of such geothermal areas and to monitor its evolution.
Weiyang Bao and Carlos Moffat
The Cryosphere, 18, 187–203, https://doi.org/10.5194/tc-18-187-2024, https://doi.org/10.5194/tc-18-187-2024, 2024
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A shallow sill can promote the downward transport of the upper-layer freshwater outflow in proglacial fjords. This sill-driven transport reduces fjord temperature and stratification. The sill depth, freshwater discharge, fjord temperature, and stratification are key parameters that modulate the heat supply towards glaciers. Additionally, the relative depth of the plume outflow, the fjord, and the sill can be used to characterize distinct circulation and heat transport regimes in glacial fjords.
Marion A. McKenzie, Lauren E. Miller, Jacob S. Slawson, Emma J. MacKie, and Shujie Wang
The Cryosphere, 17, 2477–2486, https://doi.org/10.5194/tc-17-2477-2023, https://doi.org/10.5194/tc-17-2477-2023, 2023
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Topographic highs (“bumps”) across glaciated landscapes have the potential to affect glacial ice. Bumps in the deglaciated Puget Lowland are assessed for streamlined glacial features to provide insight on ice–bed interactions. We identify a general threshold in which bumps significantly disrupt ice flow and sedimentary processes in this location. However, not all bumps have the same degree of impact. The system assessed here has relevance to parts of the Greenland Ice Sheet and Thwaites Glacier.
Camilo Andrés Rada Giacaman and Christian Schoof
The Cryosphere, 17, 761–787, https://doi.org/10.5194/tc-17-761-2023, https://doi.org/10.5194/tc-17-761-2023, 2023
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Water flowing at the base of glaciers plays a crucial role in controlling the speed at which glaciers move and how glaciers react to climate. The processes happening below the glaciers are extremely hard to observe and remain only partially understood. Here we provide novel insight into the subglacial environment based on an extensive dataset with over 300 boreholes on an alpine glacier in the Yukon Territory. We highlight the importance of hydraulically disconnected regions of the glacier bed.
Alexander O. Hager, Matthew J. Hoffman, Stephen F. Price, and Dustin M. Schroeder
The Cryosphere, 16, 3575–3599, https://doi.org/10.5194/tc-16-3575-2022, https://doi.org/10.5194/tc-16-3575-2022, 2022
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The presence of water beneath glaciers is a control on glacier speed and ocean-caused melting, yet it has been unclear whether sizable volumes of water can exist beneath Antarctic glaciers or how this water may flow along the glacier bed. We use computer simulations, supported by observations, to show that enough water exists at the base of Thwaites Glacier, Antarctica, to form "rivers" beneath the glacier. These rivers likely moderate glacier speed and may influence its rate of retreat.
Amy Jenson, Jason M. Amundson, Jonathan Kingslake, and Eran Hood
The Cryosphere, 16, 333–347, https://doi.org/10.5194/tc-16-333-2022, https://doi.org/10.5194/tc-16-333-2022, 2022
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Outburst floods are sudden releases of water from glacial environments. As glaciers retreat, changes in glacier and basin geometry impact outburst flood characteristics. We combine a glacier flow model describing glacier retreat with an outburst flood model to explore how ice dam height, glacier length, and remnant ice in a basin influence outburst floods. We find storage capacity is the greatest indicator of flood magnitude, and the flood onset mechanism is a significant indicator of duration.
Anna Derkacheva, Fabien Gillet-Chaulet, Jeremie Mouginot, Eliot Jager, Nathan Maier, and Samuel Cook
The Cryosphere, 15, 5675–5704, https://doi.org/10.5194/tc-15-5675-2021, https://doi.org/10.5194/tc-15-5675-2021, 2021
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Along the edges of the Greenland Ice Sheet surface melt lubricates the bed and causes large seasonal fluctuations in ice speeds during summer. Accurately understanding how these ice speed changes occur is difficult due to the inaccessibility of the glacier bed. We show that by using surface velocity maps with high temporal resolution and numerical modelling we can infer the basal conditions that control seasonal fluctuations in ice speed and gain insight into seasonal dynamics over large areas.
Andrew O. Hoffman, Knut Christianson, Daniel Shapero, Benjamin E. Smith, and Ian Joughin
The Cryosphere, 14, 4603–4609, https://doi.org/10.5194/tc-14-4603-2020, https://doi.org/10.5194/tc-14-4603-2020, 2020
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The West Antarctic Ice Sheet has long been considered geometrically prone to collapse, and Thwaites Glacier, the largest glacier in the Amundsen Sea, is likely in the early stages of disintegration. Using observations of Thwaites Glacier velocity and elevation change, we show that the transport of ~2 km3 of water beneath Thwaites Glacier has only a small and transient effect on glacier speed relative to ongoing thinning driven by ocean melt.
Andreas Alexander, Jaroslav Obu, Thomas V. Schuler, Andreas Kääb, and Hanne H. Christiansen
The Cryosphere, 14, 4217–4231, https://doi.org/10.5194/tc-14-4217-2020, https://doi.org/10.5194/tc-14-4217-2020, 2020
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In this study we present subglacial air, ice and sediment temperatures from within the basal drainage systems of two cold-based glaciers on Svalbard during late spring and the summer melt season. We put the data into the context of air temperature and rainfall at the glacier surface and show the importance of surface events on the subglacial thermal regime and erosion around basal drainage channels. Observed vertical erosion rates thereby reachup to 0.9 m d−1.
Ugo Nanni, Florent Gimbert, Christian Vincent, Dominik Gräff, Fabian Walter, Luc Piard, and Luc Moreau
The Cryosphere, 14, 1475–1496, https://doi.org/10.5194/tc-14-1475-2020, https://doi.org/10.5194/tc-14-1475-2020, 2020
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Our study addresses key questions on the subglacial drainage system physics through a novel observational approach that overcomes traditional limitations. We conducted, over 2 years, measurements of the subglacial water-flow-induced seismic noise and of glacier basal sliding speeds. We then inverted for the subglacial channel's hydraulic pressure gradient and hydraulic radius and investigated the links between the equilibrium state of subglacial channels and glacier basal sliding.
Fabian Lindner, Fabian Walter, Gabi Laske, and Florent Gimbert
The Cryosphere, 14, 287–308, https://doi.org/10.5194/tc-14-287-2020, https://doi.org/10.5194/tc-14-287-2020, 2020
Edyta Łokas, Agata Zaborska, Ireneusz Sobota, Paweł Gaca, J. Andrew Milton, Paweł Kocurek, and Anna Cwanek
The Cryosphere, 13, 2075–2086, https://doi.org/10.5194/tc-13-2075-2019, https://doi.org/10.5194/tc-13-2075-2019, 2019
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Cryoconite granules built of mineral particles, organic substances and living organisms significantly influence fluxes of energy and matter at glacier surfaces. They contribute to ice melting, give rise to an exceptional ecosystem, and effectively trap contaminants. This study evaluates contamination levels of radionuclides in cryoconite from Arctic glaciers and identifies sources of this contamination, proving that cryoconite is an excellent indicator of atmospheric contamination.
Cited articles
Åkesson, H.: Simulating the climatic response of Hardangerjøkulen in
southern Norway since the Little Ice Age, MSc Thesis, University of Bergen,
Bergen, Norway, 2014.
Åkesson, H., Nisancioglu, K. H., Giesen, R. H., and Morlighem, M.: Simulating
the evolution of Hardangerjøkulen ice cap in southern Norway since the
mid-Holocene and its sensitivity to climate change, The Cryosphere, 11,
281–302, https://doi.org/10.5194/tc-11-281-2017, 2017.
Andersen, J. L. and Sollid, J. L.: Glacial chronology and glacial
geomorphology in the marginal zones of the glaciers Midtdalsbreen and
Nigardsbreen, south Norway, Norsk Geogr. Tidsskr. 25, 1–38, 1971.
Andreassen, L. M. and Elvehøy, H.: Volume change Hardangerjkulen, in:
Glaciological investigations in Norway in 2000, edited by: Kjllmoen, B.,
Norwegian Water Resources and Energy Directorate, NVE Report 2, Oslo,
Norway, 101–102, 2001.
Andreassen, L. M. and Winsvold, S. H. (Eds.): Inventory of Norwegian
glaciers, Norwegian Water Resources and Energy Directorate, NVE Report
38-2012, Oslo, Norway, 2012.
Andreassen, L. M., Huss, M., Melvold, K., Elvehøy, H., and Winsvold, S.
H.: Ice thickness measurements and volume estimates for glaciers in Norway,
J. Glaciol., 61, 763–775, 2015.
Andreassen, L. M., Elvehøy, H., Jackson, M., Kjøllmoen, B., and Giesen,
R. H.: Glaciological investigations in Norway 2011–2015, Norwegian Water
Resources and Energy Directorate, NVE Report 88, Oslo, Norway, 2016.
Andresen, L.: Homogenization of monthly long-term temperature series of
mainland Norway, Norwegian Meteorological Institute, Met.no Note 2/2011,
Oslo, Norway, 2011.
Astakhov, V. I., Kaplyanskaya, F. A., and Tarnogradskiy, V. D.: Pleistocene
permafrost of West Siberia as a deformable glacier bed, Permafrost Periglac.,
7, 165–191, 1996.
Bælum, K. and Benn, D.I.: Thermal structure and drainage system of a small
valley glacier (Tellbreen, Svalbard), investigated by ground penetrating
radar. The Cryosphere, 5, 139-149. 2011
Benn, D. I. and Evans, D. J. A.: Glaciers and Glaciation, 2nd Ed., Hodder, London,
2008.
Bentley, C. R., Lord, N., and Liu, C.: Radar reflections reveal a wet bed
beneath stagnant Ice Stream C and a frozen bed beneath ridge BC, West
Antarctica, J. Glaciol., 44, 149–156, 1998.
Björnsson, H., Gjessing, Y., Hamran, S.-E., Hagen, J. O., Liestøl, O.,
Pálsson, F., and Erlingsson, B.: The thermal regime of sub-polar glaciers
mapped by multi-frequency radio-echo sounding, J. Glaciol., 42, 23–32, 1996.
Blatter, H. and Hutter, K.: Polythermal conditions in Arctic glaciers, J.
Glaciol., 37, 261–269, 1991.
Boston, C. and Lukas, S.: Evidence for restricted Loch Lomond Stadial
plateau ice in Glen Turret and implications for the age of the Turret Fan,
P. Geologist. Assoc., 128, 42–53, 2017.
Boston, C., Lukas, S., and Carr, S.: A Younger Dryas plateau icefield in the
Monadhliath, Scotland, and implications for regional palaeoclimate,
Quaternary Sci. Rev., 108, 139–162, 2015.
Boulton, G. S.: The role of thermal regime in glacial sedimentation, in:
Polar Geomorphology, edited by: Price, R. J. and Sugden, D. E., IBG Special
Publication 4, London, 1–19, 1972.
Bradwell, T.: Annual moraines and summer temperatures at
Lambatungnajökull, Iceland, Arct. Antarct. Alp. Res., 36, 601–607,
2004.
Budd, W. F., Young, N. W., and Austin, C. R.: Measured and computed
temperature distributions in the Law Dome ice cap, Antarctica, J. Glaciol.,
16, 99–110, 1976.
Chandler, B. M., Lovell, H., Boston, C. M., Lukas, S., Barr, I. D.,
Benediktsson, Í. Ö., Benn, D. I., Clark, C. D., Darvill, C. M.,
Evans, D. J., and Ewertowski, M. W.: Glacial geomorphological mapping: A
review of approaches and frameworks for best practice, Earth Sci. Rev., 185,
806–846, 2018.
Christoffersen, P. and Tulaczyk, S.: Response of subglacial sediments to
basal freeze-on. Theory and comparison to observations from beneath the West
Antarctic Ice Sheet, J. Geophys. Res., 108, 2222,
https://doi.org/10.1029/2002JB001935, 2003.
Copland, L. and Sharp, M.: Mapping thermal and hydrological conditions
beneath a polythermal glacier with radio-echo sounding, J. Glaciol., 47,
232–242, 2001.
Cuffey, K. M. and Paterson, W. S. B.: The Physics of Glaciers, 4th edition,
edited by: Butterworth-Heinemann, Elsevier, Oxford, 2010.
Dobiński, W., Grabiec, M., and Glazer, M.: Cold–temperate transition
surface and permafrost base (CTS-PB) as an environmental axis in
glacier–permafrost relationship, based on research carried out on the
Storglaciären and its forefield, northern Sweden, Quaternary Res., 88,
551–569, 2017.
Dowdeswell, J. A., Unwin, B., Nuttall, A. M., and Wingham, D. J.: Velocity
structure, flow instability and mass flux on a large Arctic ice cap from
satellite radar interferometry, Earth Planet. Sci. Lett., 167, 131–140, 1999.
Dyke, A. S.: Landscapes of cold-centred Late Wisconsin ice caps, Arctic
Canada, Prog. Phys. Geog., 17, 223–247, 1993.
Eklund, A. and Hart, J.: Glaciotectonic deformation within a flute from the
Isfallsglaciaren, Sweden, J. Quatern. Sci., 11, 299–310, 1996.
Endres, A. L., Murray, T., Booth, A. D., and West, L. J.: A new framework for
estimating englacial water content and pore geometry using combined radar
and seismic wave velocities, Geophys. Res. Lett., 36, L04501,
https://doi.org/10.1029/2008GL036876, 2009.
Etzelmüller, B.: Quantification of thermo-erosion in pro-glacial
areas – examples from Spitsbergen, Z. Geomorphol., 44, 343–361, 2000.
Etzelmüller, B. and Hagen, J. O.: Glacier–permafrost interaction in
Arctic and alpine mountain environments with examples from southern Norway
and Svalbard, edited by: Harris, C. and Murton, J. B., Cryospheric Systems:
Glaciers and Permafrost, Geological Society, London, Special Publication
242, 11–27, 2005.
Etzelmüller, B., Berthling, I., and Sollid, J. L.: The distribution of
permafrost in Southern Norway, a GIS approach, edited by: Lewkowicz, A. G.
and Allard, M., Seventh International Conference on Permafrost, Proceedings,
Collection Nordicana, Centre d'Etudes Nordiques, Universite Laval, Quebec, PQ, Canada, 251–257,
1998.
Etzelmüller, B., Berthling, I., and Sollid, J. L.: Aspects and concepts
on the geomorphological significance of Holocene permafrost in southern
Norway, Geomorphology, 52, 87–104, 2003.
Evans, D. J. A.: Controlled moraines: origins, characteristics and
palaeoglaciological implications, Quaternary Sci. Rev., 28, 183–208, 2009.
Evans, D. J. A.: Controlled moraine development and debris transport
pathways in polythermal plateau icefields: examples from
Tungnafellsjökull, Iceland, Earth Surf. Proc. Land., 35, 1430–1444,
2010.
Evans, D. J. A. and Benn, D. I.: A Practical Guide to the Study of Glacial
Sediments, Arnold, London, 2004.
Evans, D. J. A. and Hiemstra, J. F.: Till deposition by glacier submarginal,
incremental thickening, Earth Surf. Proc. Land., 30, 1633–1662, 2005.
Gades, A. M., Raymond, C. F., Conway, H., and Jacobel, R. W.: Bed properties
of Siple Dome and adjacent ice streams, West Antarctica, inferred from
radio-echo sounding measurements, J. Glaciol., 46, 88–94, 2000.
Giesen, R. H.: The ice cap Hardangerjøkulen in the past, present and
future climate, Ph.D. thesis, Utrecht University, Utrecht, Netherlands,
7–42, 2009.
Giesen, R. H. and Oerlemans, J.: Response of the ice cap Hardangerjøkulen in
southern Norway to the 20th and 21st century climates, The Cryosphere, 4,
191–213, https://doi.org/10.5194/tc-4-191-2010, 2010.
Gisnås, K., Westermann, S., Schuler, T. V., Litherland, T., Isaksen, K.,
Boike, J., and Etzelmüller, B.: A statistical approach to represent
small-scale variability of permafrost temperatures due to snow cover, The
Cryosphere, 8, 2063–2074, https://doi.org/10.5194/tc-8-2063-2014, 2014.
Glasser, N. F., Hambrey, M. J., Etienne, J. L., Jansson, P., and Petterson,
R.: The origin and significance of debris-charged ridges at the surface of
Storglaciären, northern Sweden, Geog. Ann. A, 85, 127–147, 2003.
Gordon, J., Whalley, W., Gellatly, A., and Vere, D.: The formation of glacial
flutes: assessment of models with evidence from Lyngsdalen, North Norway,
Quaternary Sci. Rev., 11, 709–731, 1992.
Grasmueck, M., Weger, R., and Horstmeyer, H.: Full-resolution 3D GPR imaging,
Geophysics, 70, K12–K19, https://doi.org/10.1190/1.1852780, 2005.
Gusmeroli, A., Murray, T., Jansson, P., Pettersson, R., Aschwanden, A., and
Booth, A. D.: Vertical distribution of water within the polythermal
Storglaciären, Sweden, J. Geophys. Res., 115, F04002, https://doi.org/10.1029/2009JF001539,
2010.
Gusmeroli, A., Jansson, P., Petterson, R., and Murray, T.: Twenty years of
cold surface layer thinning at Storglaciären, sub-Arctic Sweden,
1989–2009, J. Glaciol., 58, 3–10, 2012.
Hagen, J. O.: Brefrontprosesser ved Hardangerjøkulen (Glacier front
processes at Hardangerjckulen), Cand. real. Thesis, University of Oslo,
Norway, Oslo, 1978.
Hallet, B., Hunter, L., and Bogen, J.: Rates of erosion and sediment
evacuation by glaciers: a review of field data and their implications,
Global Planet. Change, 12, 213–235, 1996.
Hiemstra, J. F., Matthews, J. A., Evans, D. J. A., and Owen, G.: Sediment
fingerprinting and the mode of formation of singular and composite annual
moraine ridges at two southern Norwegian glacier margins, The Holocene, 25,
1772–1785, 2015.
Holbrook, W. S., Miller, S. N., and Provart, M. A.: Estimating snow water
equivalent over long mountain transects using snowmobile-mounted ground
penetrating radar, Geophysics, 81, WA183–WA193, https://doi.org/10.1190/geo2015-0121.1,
2016.
Holmlund, P. and Eriksson, M.: The cold surface layer on Storglaciären,
Geog. Ann. A, 71, 241–244, 1989.
Killingbeck, S. F., Livermore, P. W., Booth, A. D., and West, L. J.:
Multimodal layered transdimensional inversion of seismic dispersion curves
with depth constraints, Geochem. Geophys. Geosy., 19, 4957–4971, https://doi.org/10.1029/2018GC008000,
2018.
Kleman, J. and Borgström, I.: Glacial land forms indicative of a partly
frozen bed, J. Glaciol., 40, 255–264, 1994.
Kleman, J. and Hättestrand, C.: Frozen-bed Fennoscandian and Laurentide
ice sheets during the Last Glacial Maximum, Nature, 402, 63–66, 1999.
Kneisel, C., Haeberli, W., and Baumhauer, R.: Comparison of spatial modelling
and field evidence of glacier/permafrost relations in an alpine permafrost
environment. Ann. Glaciol., 31, 269–274, 2000.
Knight, P. G.: The basal ice layer of glaciers and ice sheets, Quatrnary Sci.
Rev., 16, 975–993, 1997.
Koppes, M., Hallet, B., Rignot, E., Mouginot, J., Wellner, J. S., and Boldt,
K.: Observed latitudinal variations in erosion as a function of glacier
dynamics, Nature, 526, 100–103, 2015.
Krantz, K.: Volume changes and traditional mass balance on two outlet
glaciers at Hardangerjøkulen,
Norway, Master's thesis, University of Oslo, Oslo, Norway 2002.
Kristensen, T. B., Piotrowski, J. A., Huuse, M., Clausen, O. R., and Hamberg,
L.: Time-transgressive tunnel valley formation indicated by infill sediment
structure, North Sea – the role of glaciohydraulic supercooling, Earth
Surf. Proc. Land., 33, 546–559, 2008.
Krüger, J.: Moraine-ridge formation along a stationary ice front in
Iceland, Boreas, 22, 101–109, 1993.
Krüger, J.: Glacial processes, sediments, landforms and stratigraphy in
the terminus region of Mýrdalsjökull, Iceland, Folia Geogr.
Danica, 21, 1–233, 1994.
Krüger, J.: Origin, chronology and climatological significance of
annual-moraine ridges at Mýrdalsjökull, Iceland, The Holocene, 5,
420–427, 1995.
Krüger, J.: Moraine ridges formed from subglacial frozen-on sediment
slabs and their differentiation from push moraines, Boreas, 25, 57–63,
1996.
Krüger, J., Kjær, K. H., and van der Meer, J. J. M.: From push
moraine to single-crested dump moraine during a sustained glacier advance,
Norsk Geogr. Tidsskr., 56, 87–95, 2002.
Krüger, J., Schomacker, A., and Benediktsson, Í. Ö.: Ice-marginal
environments: geomorphic and structural genesis of marginal moraines at
Mýrdalsjökull, Dev. Quatern. Sci., 13, 79–104,
2010.
Liestøl, O. and Sollid, J. L.: Glacier erosion and sedimentation at
Hardangerjøkullen and Omnsbreen, edited by: Orheim, O., Symposium on
Processes of Glacier Erosion and Sedimentation, Field Guide to Excursion,
Norsk Polarinstitutt, Oslo, Norway, 1-22, 1980.
Lilleøren, K. S., Humlum, O., Nesje, A., and Etzelmüller, B.:
Holocene development and geomorphic processes at Omnsbreen,
southern Norway: evidence for glacier–permafrost interactions, Holocene,
23, 796–809, 2013.
Lovell, H., Fleming, E. J., Benn, D. I., Hubbard, B., Lukas, S., and Naegeli,
K.: Former dynamic behaviour of a cold-based valley glacier on Svalbard
revealed by basal ice and structural glaciology investigations, J. Glaciol.,
61, 309–328, 2015.
Luetschg, M., Lehning, M., and Haeberli, W.: A sensitivity study of factors
influencing warm/thin permafrost in the Swiss Alps, J. Glaciol., 54,
696–704, 2008.
Lukas, S., Nicholson, L. I., Ross, F. H., and Humlum, O.: Formation, meltout
processes and landscape alteration of high ice-cored moraines – examples
from Nordenskiöld Land, central Spitsbergen, Polar Geogr., 29,
157–187, 2005.
MacGregor, J. A., Colgan, W. T., Fahnestock, M. A., Morighem, M., Catania,
G. A., Paden, J. D., and Gogineni, S. P.: Holocene deceleration of the
Greenland Ice Sheet, Science, 351, 590–593, 2016.
Matthews, J. A., McCarroll, D., and Shakesby, R. A.: Contemporary
terminal-moraines ridge formation at a temperate glacier: Styggedalsbreen,
Jotunheimen, southern Norway, Boreas, 24, 129–139, 1995.
Meyer, C. R., Downey, A. S., and Rempel, A. W.: Freeze-on limits bed strength
beneath sliding glaciers, Nature, 9, 3242,
https://doi.org/10.1038/s41467-018-05716-1, 2018.
Mooers, H. D.: Ice-marginal thrusting of drift and bedrock: thermal regime,
subglacial aquifers, and glacial surges, Can. J. Earth Sci., 27, 849–862,
1990.
Moore, P. L., Iverson, N. R., Brugger, K. A., Cohen, D., Hooyer, T. S., and
Jansson, P.: Effect of a cold margin on ice flow at the terminus of
Storglaciären, Sweden: implications for sediment transport, J. Glaciol.,
57, 77–87, 2011.
Moran, S. R., Clayeton, L., Hooke, R. L., Fenton, M. M., and Andriashek, L.
D.: Glacier bed landforms of the prairie region of North America, J.
Glaciol., 25, 457–476, 1980.
Murray, T. and Booth, A. D.: Imaging glacial sediment inclusions in 3-D
using ground-penetrating radar at Kongsvegen,
Svalbard, J. Quaternary Sci., 25, 754–761, 2009.
Murray, T., Stuart, G. W., Fry M., Gamble, N. H., and Crabtree, M. D.:
Englacial water distribution in a temperate glacier from surface and bore
hole radar velocity analysis, J. Glaciol., 46, 389–398, 2000.
Myhra, K. S., Westermann, S., and Etzelmüller, B.: Modelled Distribution
and Temporal Evolution of Permafrost in Steep Rock Walls Along a Latitudinal
Transect in Norway by CryoGrid 2D, Permafrost Periglac., 28, 172–182, 2017.
Nesje, A. and Matthews, J. A.: The Briksdalsbre Event: a winter
precipitation-induced glacial advance in southern Norway in the 1990s and
its implications, The Holocene, 22, 249–261, 2012.
Nesje, A., Bakke, J., Dahl, S. O., Lie, Ø., and Matthews, J. A.: Norwegian
mountain glaciers in the past, present and future, Global Planet. Change,
60, 10–27, 2008.
Noetzli, J., Gruber, S. G., Kohl, T., Nadine, S., and Haeberli, W.:
Three-dimensional distribution and evolution of permafrost temperatures in
idealized high-mountain topography, J. Geophys. Res.-Earth, 112, F02S13,
https://doi.org/10.1029/2006JF000545, 2007.
Nordli, Ø., Lie, Ø., Nesje, A., and Dahl, S. O.: Spring-summer
temperature reconstruction in western Norway 1734–2003: A data-synthesis
approach', Int. J. Climatol., 23, 1821–1841, 2003.
Ødegård, R. S., Hamran, S. E., Bø, P. H., Etzelmüller, B.,
Vatne, G., and Sollid, J. L.: Thermal regime of a valley glacier, Erikbreen,
northern Spitsbergen, Polar Res., 11, 69–79, 1992.
Østrem, G.: Ice-cored moraines in Scandinavia, Geogr. Ann., 46A,
282–337, 1964.
Pettersson, R.: Dynamics of the cold surface layer of polythermal
Storgalciären, Sweden, Doctoral thesis, Stockholm University, Department of
Physical Geography and Quaternary Geology, 2004.
Pettersson, R., Jansson, P., and Holmlund, P.: Cold surface layer thinning on
Storglaciären, Sweden, observed by repeated ground penetrating radar
surveys, J. Geophys. Res., 108, 6004, https://doi.org/10.1029/2003JF000024, 2003
Pettersson, R., Jansson, P., Huwald, H., and Blatter, H.: Spatial pattern and
stability of the cold surface layer of Storglaciären, Sweden, J.
Glaciol., 53, 99–109, 2007.
Plewes, L. A. and Hubbard, B.: A review of the use of radio-echo sounding in
glaciology, Prog. Phys. Geog., 25, 20–236, 2001.
Rea, B. R. and Evans, D. J. A.: Plateau icefield landsystems, in: Glacial
Landsystems, edited by: Evans D. J. A., Arnold, London, 407–431, 2003.
Reinardy, B. T. I., Leighton, I., and Marx, P. J.: Glacier thermal regime
linked to processes of annual moraine formation at Midtdalsbreen, southern
Norway, Boreas, 42, 896–911, 2013.
Reinardy, B., Booth, A., Hughes, A. L. C., Boston, C. M., Akesson, H., Bakke,
J., Nesje, A., Giesen, R., and Pearce, D. M.: GPR dataset acquired around the
2014 margin of Norway's Midtdalsbreen glacier, Figshare Dataset,
https://doi.org/10.6084/m9.figshare.7695662.v1, 2019.
Rippin, D. M., Carrivick, J. L., and Williams, C.: Evidence towards a thermal
lag in the response of Kårsaglaciären, northern Sweden, to climate
change, J. Glaciol., 574, 895–903, 2011.
Roberson, S., Hubbard, B., Coulson, H., and Boomer, I.: Physical properties
and formation of flutes at a polythermal valley glacier: Midre
Lovénbreen, Svalbard, Geog. Ann. A, 93, 71–88, 2011.
Sharp, M.: Annual moraine ridges at Skálafellsjökull, southeast
Iceland, J. Glaciol., 30, 82–93, 1984.
Sollid, J. L. and Bjørkenes, A.: Glacial Geology of Midtdalsbreen.
1:5000, Norges Geografiske Oppmåling, Oslo, 1978.
Waller, R. I., Murton, J. B., and Kristensen, L.: Glacier-permafrost
interactions: Processes, products and glaciological implications, Sediment.
Geol., 255, 1–28, 2012.
Weertman, J.: Mechanism for the formation of inner moraines found near the
edge of cold ice caps and ice sheets, J. Glaciol., 3, 965–978, 1961.
Willis, I. C., Fitzsimmons, C. D., Melvold, K., Andreassen, L. M., and
Giesen, R. H.: Structure, morphology and water flux of a subglacial drainage
system, Midtdalsbreen, Norway, Hydrol. Process., 26, 3810–3829, 2015.
Winkler, S. and Matthews, J. A.: Observations on terminal moraine ridge
formation during recent advances of southern Norwegian glacier,
Geomorphology, 116, 87–106, 2010.
Short summary
Cold-ice processes may be widespread within temperate glacier systems but the role of cold-ice processes in temperate glacier systems is relatively unknown. Climate forcing is the main control on glacier mass balance but potential for heterogeneous thermal conditions at temperate glaciers calls for improved model assessments of future evolution of thermal conditions and impacts on glacier dynamics and mass balance. Cold-ice processes need to be included in temperate glacier land system models.
Cold-ice processes may be widespread within temperate glacier systems but the role of cold-ice...
