Articles | Volume 17, issue 7
https://doi.org/10.5194/tc-17-2645-2023
© Author(s) 2023. 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-17-2645-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Jul 2023
Research article |
| 11 Jul 2023
| 11 Jul 2023
Towards modelling of corrugation ridges at ice-sheet grounding lines
British Antarctic Survey, Cambridge, UK
Katarzyna L. P. Warburton
Department of Applied Mathematics and Theoretical Physics, University
of Cambridge, Cambridge, UK
Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
Alastair G. C. Graham
College of Marine Science, University of South Florida, St Petersburg,
FL, USA
Jerome A. Neufeld
Department of Earth Sciences, University of Cambridge, Cambridge, UK
Department of Applied Mathematics and Theoretical Physics, University
of Cambridge, Cambridge, UK
Duncan R. Hewitt
Department of Mathematics, University College London, London, UK
Julian A. Dowdeswell
Scott Polar Research Institute, University of Cambridge, Cambridge, UK
Robert D. Larter
British Antarctic Survey, Cambridge, UK
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Tom A. Jordan, David Porter, Kirsty Tinto, Romain Millan, Atsuhiro Muto, Kelly Hogan, Robert D. Larter, Alastair G. C. Graham, and John D. Paden
The Cryosphere, 14, 2869–2882, https://doi.org/10.5194/tc-14-2869-2020, https://doi.org/10.5194/tc-14-2869-2020, 2020
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Linking ocean and ice sheet processes allows prediction of sea level change. Ice shelves form a floating buffer between the ice–ocean systems, but the water depth beneath is often a mystery, leaving a critical blind spot in our understanding of how these systems interact. Here, we use airborne measurements of gravity to reveal the bathymetry under the ice shelves flanking the rapidly changing Thwaites Glacier and adjacent glacier systems, providing new insights and data for future models.
Kelly A. Hogan, Robert D. Larter, Alastair G. C. Graham, Robert Arthern, James D. Kirkham, Rebecca L. Totten, Tom A. Jordan, Rachel Clark, Victoria Fitzgerald, Anna K. Wåhlin, John B. Anderson, Claus-Dieter Hillenbrand, Frank O. Nitsche, Lauren Simkins, James A. Smith, Karsten Gohl, Jan Erik Arndt, Jongkuk Hong, and Julia Wellner
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The sea-floor geometry around the rapidly changing Thwaites Glacier is a key control on warm ocean waters reaching the ice shelf and grounding zone beyond. This area was previously unsurveyed due to icebergs and sea-ice cover. The International Thwaites Glacier Collaboration mapped this area for the first time in 2019. The data reveal troughs over 1200 m deep and, as this region is thought to have only ungrounded recently, provide key insights into the morphology beneath the grounded ice sheet.
Kelly A. Hogan, Martin Jakobsson, Larry Mayer, Brendan T. Reilly, Anne E. Jennings, Joseph S. Stoner, Tove Nielsen, Katrine J. Andresen, Egon Nørmark, Katrien A. Heirman, Elina Kamla, Kevin Jerram, Christian Stranne, and Alan Mix
The Cryosphere, 14, 261–286, https://doi.org/10.5194/tc-14-261-2020, https://doi.org/10.5194/tc-14-261-2020, 2020
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Glacial sediments in fjords hold a key record of environmental and ice dynamic changes during ice retreat. Here we use a comprehensive geophysical survey from the Petermann Fjord system in NW Greenland to map these sediments, identify depositional processes and calculate glacial erosion rates for the retreating palaeo-Petermann ice stream. Ice streaming is the dominant control on glacial erosion rates which vary by an order of magnitude during deglaciation and are in line with modern rates.
James D. Kirkham, Kelly A. Hogan, Robert D. Larter, Neil S. Arnold, Frank O. Nitsche, Nicholas R. Golledge, and Julian A. Dowdeswell
The Cryosphere, 13, 1959–1981, https://doi.org/10.5194/tc-13-1959-2019, https://doi.org/10.5194/tc-13-1959-2019, 2019
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A series of huge (500 m wide, 50 m deep) channels were eroded by water flowing beneath Pine Island and Thwaites glaciers in the past. The channels are similar to canyon systems produced by floods of meltwater released beneath the Antarctic Ice Sheet millions of years ago. The spatial extent of the channels formed beneath Pine Island and Thwaites glaciers demonstrates significant quantities of water, possibly discharged from trapped subglacial lakes, flowed beneath these glaciers in the past.
Robert D. Larter, Kelly A. Hogan, Claus-Dieter Hillenbrand, James A. Smith, Christine L. Batchelor, Matthieu Cartigny, Alex J. Tate, James D. Kirkham, Zoë A. Roseby, Gerhard Kuhn, Alastair G. C. Graham, and Julian A. Dowdeswell
The Cryosphere, 13, 1583–1596, https://doi.org/10.5194/tc-13-1583-2019, https://doi.org/10.5194/tc-13-1583-2019, 2019
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We present high-resolution bathymetry data that provide the most complete and detailed imagery of any Antarctic palaeo-ice stream bed. These data show how subglacial water was delivered to and influenced the dynamic behaviour of the ice stream. Our observations provide insights relevant to understanding the behaviour of modern ice streams and forecasting the contributions that they will make to future sea level rise.
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The Brunt Ice Shelf in Antarctica is home to Halley VIa, the latest in a series of six British research stations that have occupied the ice shelf since 1956. A recent rapid growth of rifts in the Brunt Ice Shelf signals the onset of its largest calving event since records began. Here we consider whether this calving event will lead to a new steady state for the ice shelf or an unpinning from the bed, which could predispose it to accelerated flow or collapse.
Dominic A. Hodgson, Kelly Hogan, James M. Smith, James A. Smith, Claus-Dieter Hillenbrand, Alastair G. C. Graham, Peter Fretwell, Claire Allen, Vicky Peck, Jan-Erik Arndt, Boris Dorschel, Christian Hübscher, Andrew M. Smith, and Robert Larter
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We studied the Coats Land ice margin, Antarctica, providing a multi-disciplinary geophysical assessment of the ice sheet configuration through its last advance and retreat; a description of the physical constraints on the stability of the past and present ice and future margin based on its submarine geomorphology and ice-sheet geometry; and evidence that once detached from the bed, the ice shelves in this region were predisposed to rapid retreat back to coastal grounding lines.
Michael A. Cooper, Paulina Lewińska, William A. P. Smith, Edwin R. Hancock, Julian A. Dowdeswell, and David M. Rippin
The Cryosphere, 16, 2449–2470, https://doi.org/10.5194/tc-16-2449-2022, https://doi.org/10.5194/tc-16-2449-2022, 2022
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Here we use old photographs gathered several decades ago to expand the temporal record of glacier change in part of East Greenland. This is important because the longer the record of past glacier change, the better we are at predicting future glacier behaviour. Our work also shows that despite all these glaciers retreating, the rate at which they do this varies markedly. It is therefore important to consider outlet glaciers from Greenland individually to take account of this differing behaviour.
Tom A. Jordan, David Porter, Kirsty Tinto, Romain Millan, Atsuhiro Muto, Kelly Hogan, Robert D. Larter, Alastair G. C. Graham, and John D. Paden
The Cryosphere, 14, 2869–2882, https://doi.org/10.5194/tc-14-2869-2020, https://doi.org/10.5194/tc-14-2869-2020, 2020
Short summary
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Linking ocean and ice sheet processes allows prediction of sea level change. Ice shelves form a floating buffer between the ice–ocean systems, but the water depth beneath is often a mystery, leaving a critical blind spot in our understanding of how these systems interact. Here, we use airborne measurements of gravity to reveal the bathymetry under the ice shelves flanking the rapidly changing Thwaites Glacier and adjacent glacier systems, providing new insights and data for future models.
Kelly A. Hogan, Robert D. Larter, Alastair G. C. Graham, Robert Arthern, James D. Kirkham, Rebecca L. Totten, Tom A. Jordan, Rachel Clark, Victoria Fitzgerald, Anna K. Wåhlin, John B. Anderson, Claus-Dieter Hillenbrand, Frank O. Nitsche, Lauren Simkins, James A. Smith, Karsten Gohl, Jan Erik Arndt, Jongkuk Hong, and Julia Wellner
The Cryosphere, 14, 2883–2908, https://doi.org/10.5194/tc-14-2883-2020, https://doi.org/10.5194/tc-14-2883-2020, 2020
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The sea-floor geometry around the rapidly changing Thwaites Glacier is a key control on warm ocean waters reaching the ice shelf and grounding zone beyond. This area was previously unsurveyed due to icebergs and sea-ice cover. The International Thwaites Glacier Collaboration mapped this area for the first time in 2019. The data reveal troughs over 1200 m deep and, as this region is thought to have only ungrounded recently, provide key insights into the morphology beneath the grounded ice sheet.
Jan Erik Arndt, Robert D. Larter, Claus-Dieter Hillenbrand, Simon H. Sørli, Matthias Forwick, James A. Smith, and Lukas Wacker
The Cryosphere, 14, 2115–2135, https://doi.org/10.5194/tc-14-2115-2020, https://doi.org/10.5194/tc-14-2115-2020, 2020
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We interpret landforms on the seabed and investigate sediment cores to improve our understanding of the past ice sheet development in this poorly understood part of Antarctica. Recent crack development of the Brunt ice shelf has raised concerns about its stability and the security of the British research station Halley. We describe ramp-shaped bedforms that likely represent ice shelf grounding and stabilization locations of the past that may reflect an analogue to the process going on now.
Kelly A. Hogan, Martin Jakobsson, Larry Mayer, Brendan T. Reilly, Anne E. Jennings, Joseph S. Stoner, Tove Nielsen, Katrine J. Andresen, Egon Nørmark, Katrien A. Heirman, Elina Kamla, Kevin Jerram, Christian Stranne, and Alan Mix
The Cryosphere, 14, 261–286, https://doi.org/10.5194/tc-14-261-2020, https://doi.org/10.5194/tc-14-261-2020, 2020
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Glacial sediments in fjords hold a key record of environmental and ice dynamic changes during ice retreat. Here we use a comprehensive geophysical survey from the Petermann Fjord system in NW Greenland to map these sediments, identify depositional processes and calculate glacial erosion rates for the retreating palaeo-Petermann ice stream. Ice streaming is the dominant control on glacial erosion rates which vary by an order of magnitude during deglaciation and are in line with modern rates.
James D. Kirkham, Kelly A. Hogan, Robert D. Larter, Neil S. Arnold, Frank O. Nitsche, Nicholas R. Golledge, and Julian A. Dowdeswell
The Cryosphere, 13, 1959–1981, https://doi.org/10.5194/tc-13-1959-2019, https://doi.org/10.5194/tc-13-1959-2019, 2019
Short summary
Short summary
A series of huge (500 m wide, 50 m deep) channels were eroded by water flowing beneath Pine Island and Thwaites glaciers in the past. The channels are similar to canyon systems produced by floods of meltwater released beneath the Antarctic Ice Sheet millions of years ago. The spatial extent of the channels formed beneath Pine Island and Thwaites glaciers demonstrates significant quantities of water, possibly discharged from trapped subglacial lakes, flowed beneath these glaciers in the past.
Robert D. Larter, Kelly A. Hogan, Claus-Dieter Hillenbrand, James A. Smith, Christine L. Batchelor, Matthieu Cartigny, Alex J. Tate, James D. Kirkham, Zoë A. Roseby, Gerhard Kuhn, Alastair G. C. Graham, and Julian A. Dowdeswell
The Cryosphere, 13, 1583–1596, https://doi.org/10.5194/tc-13-1583-2019, https://doi.org/10.5194/tc-13-1583-2019, 2019
Short summary
Short summary
We present high-resolution bathymetry data that provide the most complete and detailed imagery of any Antarctic palaeo-ice stream bed. These data show how subglacial water was delivered to and influenced the dynamic behaviour of the ice stream. Our observations provide insights relevant to understanding the behaviour of modern ice streams and forecasting the contributions that they will make to future sea level rise.
Dominic A. Hodgson, Tom A. Jordan, Jan De Rydt, Peter T. Fretwell, Samuel A. Seddon, David Becker, Kelly A. Hogan, Andrew M. Smith, and David G. Vaughan
The Cryosphere, 13, 545–556, https://doi.org/10.5194/tc-13-545-2019, https://doi.org/10.5194/tc-13-545-2019, 2019
Short summary
Short summary
The Brunt Ice Shelf in Antarctica is home to Halley VIa, the latest in a series of six British research stations that have occupied the ice shelf since 1956. A recent rapid growth of rifts in the Brunt Ice Shelf signals the onset of its largest calving event since records began. Here we consider whether this calving event will lead to a new steady state for the ice shelf or an unpinning from the bed, which could predispose it to accelerated flow or collapse.
Dominic A. Hodgson, Kelly Hogan, James M. Smith, James A. Smith, Claus-Dieter Hillenbrand, Alastair G. C. Graham, Peter Fretwell, Claire Allen, Vicky Peck, Jan-Erik Arndt, Boris Dorschel, Christian Hübscher, Andrew M. Smith, and Robert Larter
The Cryosphere, 12, 2383–2399, https://doi.org/10.5194/tc-12-2383-2018, https://doi.org/10.5194/tc-12-2383-2018, 2018
Short summary
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We studied the Coats Land ice margin, Antarctica, providing a multi-disciplinary geophysical assessment of the ice sheet configuration through its last advance and retreat; a description of the physical constraints on the stability of the past and present ice and future margin based on its submarine geomorphology and ice-sheet geometry; and evidence that once detached from the bed, the ice shelves in this region were predisposed to rapid retreat back to coastal grounding lines.
Jan Erik Arndt, Robert D. Larter, Peter Friedl, Karsten Gohl, Kathrin Höppner, and the Science Team of Expedition PS104
The Cryosphere, 12, 2039–2050, https://doi.org/10.5194/tc-12-2039-2018, https://doi.org/10.5194/tc-12-2039-2018, 2018
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The calving line location of the Pine Island Glacier did not show any trend within the last 70 years until calving in 2015 led to unprecedented retreat. In February 2017 we accessed this previously ice-shelf-covered area with RV Polarstern and mapped the sea-floor topography for the first time. Satellite imagery of the last decades show how the newly mapped shoals affected the ice shelf development and highlights that sea-floor topography is an important factor in initiating calving events.
Johannes Jakob Fürst, Fabien Gillet-Chaulet, Toby J. Benham, Julian A. Dowdeswell, Mariusz Grabiec, Francisco Navarro, Rickard Pettersson, Geir Moholdt, Christopher Nuth, Björn Sass, Kjetil Aas, Xavier Fettweis, Charlotte Lang, Thorsten Seehaus, and Matthias Braun
The Cryosphere, 11, 2003–2032, https://doi.org/10.5194/tc-11-2003-2017, https://doi.org/10.5194/tc-11-2003-2017, 2017
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For the large majority of glaciers and ice caps, there is no information on the thickness of the ice cover. Any attempt to predict glacier demise under climatic warming and to estimate the future contribution to sea-level rise is limited as long as the glacier thickness is not well constrained. Here, we present a two-step mass-conservation approach for mapping ice thickness. Measurements are naturally reproduced. The reliability is readily assessible from a complementary map of error estimates.
Daniel Farinotti, Douglas J. Brinkerhoff, Garry K. C. Clarke, Johannes J. Fürst, Holger Frey, Prateek Gantayat, Fabien Gillet-Chaulet, Claire Girard, Matthias Huss, Paul W. Leclercq, Andreas Linsbauer, Horst Machguth, Carlos Martin, Fabien Maussion, Mathieu Morlighem, Cyrille Mosbeux, Ankur Pandit, Andrea Portmann, Antoine Rabatel, RAAJ Ramsankaran, Thomas J. Reerink, Olivier Sanchez, Peter A. Stentoft, Sangita Singh Kumari, Ward J. J. van Pelt, Brian Anderson, Toby Benham, Daniel Binder, Julian A. Dowdeswell, Andrea Fischer, Kay Helfricht, Stanislav Kutuzov, Ivan Lavrentiev, Robert McNabb, G. Hilmar Gudmundsson, Huilin Li, and Liss M. Andreassen
The Cryosphere, 11, 949–970, https://doi.org/10.5194/tc-11-949-2017, https://doi.org/10.5194/tc-11-949-2017, 2017
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ITMIX – the Ice Thickness Models Intercomparison eXperiment – was the first coordinated performance assessment for models inferring glacier ice thickness from surface characteristics. Considering 17 different models and 21 different test cases, we show that although solutions of individual models can differ considerably, an ensemble average can yield uncertainties in the order of 10 ± 24 % the mean ice thickness. Ways forward for improving such estimates are sketched.
Christopher N. Williams, Stephen L. Cornford, Thomas M. Jordan, Julian A. Dowdeswell, Martin J. Siegert, Christopher D. Clark, Darrel A. Swift, Andrew Sole, Ian Fenty, and Jonathan L. Bamber
The Cryosphere, 11, 363–380, https://doi.org/10.5194/tc-11-363-2017, https://doi.org/10.5194/tc-11-363-2017, 2017
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Knowledge of ice sheet bed topography and surrounding sea floor bathymetry is integral to the understanding of ice sheet processes. Existing elevation data products for Greenland underestimate fjord bathymetry due to sparse data availability. We present a new method to create physically based synthetic fjord bathymetry to fill these gaps, greatly improving on previously available datasets. This will assist in future elevation product development until further observations become available.
Evan J. Gowan, Paul Tregoning, Anthony Purcell, James Lea, Oscar J. Fransner, Riko Noormets, and J. A. Dowdeswell
Geosci. Model Dev., 9, 1673–1682, https://doi.org/10.5194/gmd-9-1673-2016, https://doi.org/10.5194/gmd-9-1673-2016, 2016
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We present a program that can create paleo-ice sheet reconstructions, using an assumed basal shear stress, margin location and basal topography as input. This allows for the quick determination of relatively realistic past ice sheet configurations without reliance on highly uncertain factors such as climate and ice dynamics. This is ideal for modelling Earth deformation due to the loading of ice sheets. The subsequent ice sheet configurations can be used as an input for climate modelling.
C. Lavoie, E. W. Domack, E. C. Pettit, T. A. Scambos, R. D. Larter, H.-W. Schenke, K. C. Yoo, J. Gutt, J. Wellner, M. Canals, J. B. Anderson, and D. Amblas
The Cryosphere, 9, 613–629, https://doi.org/10.5194/tc-9-613-2015, https://doi.org/10.5194/tc-9-613-2015, 2015
J. L. Bamber, J. A. Griggs, R. T. W. L. Hurkmans, J. A. Dowdeswell, S. P. Gogineni, I. Howat, J. Mouginot, J. Paden, S. Palmer, E. Rignot, and D. Steinhage
The Cryosphere, 7, 499–510, https://doi.org/10.5194/tc-7-499-2013, https://doi.org/10.5194/tc-7-499-2013, 2013
Related subject area
Discipline: Ice sheets | Subject: Subglacial Processes
Improved monitoring of subglacial lake activity in Greenland
Basal conditions of Denman Glacier from glacier hydrology and ice dynamics modeling
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Compensating errors in inversions for subglacial bed roughness: same steady state, different dynamic response
Drainage and refill of an Antarctic Peninsula subglacial lake reveal an active subglacial hydrological network
Filling and drainage of a subglacial lake beneath the Flade Isblink ice cap, northeast Greenland
Radar sounding survey over Devon Ice Cap indicates the potential for a diverse hypersaline subglacial hydrological environment
Grounding zone subglacial properties from calibrated active-source seismic methods
Subglacial lakes and hydrology across the Ellsworth Subglacial Highlands, West Antarctica
The role of electrical conductivity in radar wave reflection from glacier beds
Review article: Geothermal heat flow in Antarctica: current and future directions
Exceptionally high heat flux needed to sustain the Northeast Greenland Ice Stream
Subglacial roughness of the Greenland Ice Sheet: relationship with contemporary ice velocity and geology
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream
Louise Sandberg Sørensen, Rasmus Bahbah, Sebastian B. Simonsen, Natalia Havelund Andersen, Jade Bowling, Noel Gourmelen, Alex Horton, Nanna B. Karlsson, Amber Leeson, Jennifer Maddalena, Malcolm McMillan, Anne Solgaard, and Birgit Wessel
The Cryosphere, 18, 505–523, https://doi.org/10.5194/tc-18-505-2024, https://doi.org/10.5194/tc-18-505-2024, 2024
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Under the right topographic and hydrological conditions, lakes may form beneath the large ice sheets. Some of these subglacial lakes are active, meaning that they periodically drain and refill. When a subglacial lake drains rapidly, it may cause the ice surface above to collapse, and here we investigate how to improve the monitoring of active subglacial lakes in Greenland by monitoring how their associated collapse basins change over time.
Koi McArthur, Felicity S. McCormack, and Christine F. Dow
The Cryosphere, 17, 4705–4727, https://doi.org/10.5194/tc-17-4705-2023, https://doi.org/10.5194/tc-17-4705-2023, 2023
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Using subglacial hydrology model outputs for Denman Glacier, East Antarctica, we investigated the effects of various friction laws and effective pressure inputs on ice dynamics modeling over the same glacier. The Schoof friction law outperformed the Budd friction law, and effective pressure outputs from the hydrology model outperformed a typically prescribed effective pressure. We propose an empirical prescription of effective pressure to be used in the absence of hydrology model outputs.
Zhuo Wang, Ailsa Chung, Daniel Steinhage, Frédéric Parrenin, Johannes Freitag, and Olaf Eisen
The Cryosphere, 17, 4297–4314, https://doi.org/10.5194/tc-17-4297-2023, https://doi.org/10.5194/tc-17-4297-2023, 2023
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We combine radar-based observed internal layer stratigraphy of the ice sheet with a 1-D ice flow model in the Dome Fuji region. This results in maps of age and age density of the basal ice, the basal thermal conditions, and reconstructed accumulation rates. Based on modeled age we then identify four potential candidates for ice which is potentially 1.5 Myr old. Our map of basal thermal conditions indicates that melting prevails over the presence of stagnant ice in the study area.
Constantijn J. Berends, Roderik S. W. van de Wal, Tim van den Akker, and William H. Lipscomb
The Cryosphere, 17, 1585–1600, https://doi.org/10.5194/tc-17-1585-2023, https://doi.org/10.5194/tc-17-1585-2023, 2023
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The rate at which the Antarctic ice sheet will melt because of anthropogenic climate change is uncertain. Part of this uncertainty stems from processes occurring beneath the ice, such as the way the ice slides over the underlying bedrock.
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Dominic A. Hodgson, Tom A. Jordan, Neil Ross, Teal R. Riley, and Peter T. Fretwell
The Cryosphere, 16, 4797–4809, https://doi.org/10.5194/tc-16-4797-2022, https://doi.org/10.5194/tc-16-4797-2022, 2022
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This paper describes the drainage (and refill) of a subglacial lake on the Antarctic Peninsula resulting in the collapse of the overlying ice into the newly formed subglacial cavity. It provides evidence of an active hydrological network under the region's glaciers and close coupling between surface climate processes and the base of the ice.
Qi Liang, Wanxin Xiao, Ian Howat, Xiao Cheng, Fengming Hui, Zhuoqi Chen, Mi Jiang, and Lei Zheng
The Cryosphere, 16, 2671–2681, https://doi.org/10.5194/tc-16-2671-2022, https://doi.org/10.5194/tc-16-2671-2022, 2022
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Using multi-temporal ArcticDEM and ICESat-2 altimetry data, we document changes in surface elevation of a subglacial lake basin from 2012 to 2021. The long-term measurements show that the subglacial lake was recharged by surface meltwater and that a rapid drainage event in late August 2019 induced an abrupt ice velocity change. Multiple factors regulate the episodic filling and drainage of the lake. Our study also reveals ~ 64 % of the surface meltwater successfully descended to the bed.
Anja Rutishauser, Donald D. Blankenship, Duncan A. Young, Natalie S. Wolfenbarger, Lucas H. Beem, Mark L. Skidmore, Ashley Dubnick, and Alison S. Criscitiello
The Cryosphere, 16, 379–395, https://doi.org/10.5194/tc-16-379-2022, https://doi.org/10.5194/tc-16-379-2022, 2022
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Recently, a hypersaline subglacial lake complex was hypothesized to lie beneath Devon Ice Cap, Canadian Arctic. Here, we present results from a follow-on targeted aerogeophysical survey. Our results support the evidence for a hypersaline subglacial lake and reveal an extensive brine network, suggesting more complex subglacial hydrological conditions than previously inferred. This hypersaline system may host microbial habitats, making it a compelling analog for bines on other icy worlds.
Huw J. Horgan, Laurine van Haastrecht, Richard B. Alley, Sridhar Anandakrishnan, Lucas H. Beem, Knut Christianson, Atsuhiro Muto, and Matthew R. Siegfried
The Cryosphere, 15, 1863–1880, https://doi.org/10.5194/tc-15-1863-2021, https://doi.org/10.5194/tc-15-1863-2021, 2021
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The grounding zone marks the transition from a grounded ice sheet to a floating ice shelf. Like Earth's coastlines, the grounding zone is home to interactions between the ocean, fresh water, and geology but also has added complexity and importance due to the overriding ice. Here we use seismic surveying – sending sound waves down through the ice – to image the grounding zone of Whillans Ice Stream in West Antarctica and learn more about the nature of this important transition zone.
Felipe Napoleoni, Stewart S. R. Jamieson, Neil Ross, Michael J. Bentley, Andrés Rivera, Andrew M. Smith, Martin J. Siegert, Guy J. G. Paxman, Guisella Gacitúa, José A. Uribe, Rodrigo Zamora, Alex M. Brisbourne, and David G. Vaughan
The Cryosphere, 14, 4507–4524, https://doi.org/10.5194/tc-14-4507-2020, https://doi.org/10.5194/tc-14-4507-2020, 2020
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Subglacial water is important for ice sheet dynamics and stability. Despite this, there is a lack of detailed subglacial-water characterisation in West Antarctica (WA). We report 33 new subglacial lakes. Additionally, a new digital elevation model of basal topography was built and used to simulate the subglacial hydrological network in WA. The simulated subglacial hydrological catchments of Pine Island and Thwaites glaciers do not match precisely with their ice surface catchments.
Slawek M. Tulaczyk and Neil T. Foley
The Cryosphere, 14, 4495–4506, https://doi.org/10.5194/tc-14-4495-2020, https://doi.org/10.5194/tc-14-4495-2020, 2020
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Much of what we know about materials hidden beneath glaciers and ice sheets on Earth has been interpreted using radar reflection from the ice base. A common assumption is that electrical conductivity of the sub-ice materials does not influence the reflection strength and that the latter is controlled only by permittivity, which depends on the fraction of water in these materials. Here we argue that sub-ice electrical conductivity should be generally considered when interpreting radar records.
Alex Burton-Johnson, Ricarda Dziadek, and Carlos Martin
The Cryosphere, 14, 3843–3873, https://doi.org/10.5194/tc-14-3843-2020, https://doi.org/10.5194/tc-14-3843-2020, 2020
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The Antarctic ice sheet is the largest source for sea level rise. However, one key control on ice sheet flow remains poorly constrained: the effect of heat from the rocks beneath the ice sheet (known as
geothermal heat flow). Although this may not seem like a lot of heat, beneath thick, slow ice this heat can control how well the ice flows and can lead to melting of the ice sheet. We discuss the methods used to estimate this heat, compile existing data, and recommend future research.
Silje Smith-Johnsen, Basile de Fleurian, Nicole Schlegel, Helene Seroussi, and Kerim Nisancioglu
The Cryosphere, 14, 841–854, https://doi.org/10.5194/tc-14-841-2020, https://doi.org/10.5194/tc-14-841-2020, 2020
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The Northeast Greenland Ice Stream (NEGIS) drains a large part of Greenland and displays fast flow far inland. However, the flow pattern is not well represented in ice sheet models. The fast flow has been explained by abnormally high geothermal heat flux. The heat melts the base of the ice sheet and the water produced may lubricate the bed and induce fast flow. By including high geothermal heat flux and a hydrology model, we successfully reproduce NEGIS flow pattern in an ice sheet model.
Michael A. Cooper, Thomas M. Jordan, Dustin M. Schroeder, Martin J. Siegert, Christopher N. Williams, and Jonathan L. Bamber
The Cryosphere, 13, 3093–3115, https://doi.org/10.5194/tc-13-3093-2019, https://doi.org/10.5194/tc-13-3093-2019, 2019
Robert D. Larter, Kelly A. Hogan, Claus-Dieter Hillenbrand, James A. Smith, Christine L. Batchelor, Matthieu Cartigny, Alex J. Tate, James D. Kirkham, Zoë A. Roseby, Gerhard Kuhn, Alastair G. C. Graham, and Julian A. Dowdeswell
The Cryosphere, 13, 1583–1596, https://doi.org/10.5194/tc-13-1583-2019, https://doi.org/10.5194/tc-13-1583-2019, 2019
Short summary
Short summary
We present high-resolution bathymetry data that provide the most complete and detailed imagery of any Antarctic palaeo-ice stream bed. These data show how subglacial water was delivered to and influenced the dynamic behaviour of the ice stream. Our observations provide insights relevant to understanding the behaviour of modern ice streams and forecasting the contributions that they will make to future sea level rise.
Cited articles
Alley, R. B., Blankenship, D. D., Bentley, C. R., and Rooney, S.:
Deformation of till beneath ice stream B, West Antarctica, Nature, 322,
57–59, 1986.
Alley, R. B., Blankenship, D., Rooney, S., and Bentley, C.: Sedimentation
beneath ice shelves – the view from ice stream B, Mar. Geol., 85,
101–120, 1989.
Alley, R. B., Anandakrishnan, S., Dupont, T. K., Parizek, B. R., and
Pollard, D.: Effect of sedimentation on ice-sheet grounding-line stability,
Science, 315, 1838–1841, 2007.
Anandakrishnan, S., Catania, G. A., Alley, R. B., and Horgan, H. J.:
Discovery of till deposition at the grounding line of Whillans Ice Stream,
Science, 315, 1835–1838, 2007.
Anderson, J. B., Kurtz, D. D., Domack, E. W., and Balshaw, K. M.: Glacial
and glacialmarine sediments of the Antarctic continental shelf, J.
Geol., 27, 399e414, https://doi.org/10.1086/628524, 1980.
Batchelor, C. L., Montelli, A., Ottesen, D., Evans, J., Dowdeswell, E. K.,
Christie, F. D. W., and Dowdeswell, J. A.: New insights into the formation
of submarine glacial landforms from high-resolution Autonomous Underwater
Vehicle data, Geomorphology, 370, 107396,
https://doi.org/10.1016/j.geomorph.2020.107396, 2020.
Batchelor, C. L., Christie, F. D. W., Ottesen, D., Montelli, A., Evans, J.,
Dowdeswell, E. K., Bjarnadóttir, L. R., and Dowdeswell, J. A.: Rapid,
buoyancy-driven ice-sheet retreat of hundreds of metres per day, Nature, 617,
105–110,
https://doi.org/10.1038/s41586-023-05876-1, 2023.
Begeman, C. B., Tulaczyk, S., Padman, L., King, M., Siegfried, M. R.,
Hodson, T. O., and Fricker, H. A.: Tidal Pressurization of the Ocean Cavity
Near an Antarctic Ice Shelf Grounding Line, J. Geophys. Res.-Oceans, 125, e2019JC015562, https://doi.org/10.1029/2019JC015562, 2020.
Boulton, G.: Push-moraines and glacier-contact fans in marine and
terrestrial environments, Sedimentology, 33, 677–698, 1986.
Boulton, G. S. and Hindmarsh, R. C. A.: Sediment deformation beneath glaciers: Rheology and geological consequences, J. Geophys. Res., 92, 9059–9082, https://doi.org/10.1029/JB092iB09p09059, 1987.
Boulton, G. and Jones Paul, M.: The influence of genetic processes on some
geotechnical properties of glacial tills, Q. J. Eng.
Geol., 9, 159–194, 1976.
Brunt, K. M., Fricker, H. A., and Laurie, P.: Analysis of ice plains of the Filchner-Ronne Ice Shelf, Antarctica, using ICESat laser altimetry, J. Glaciol., 57, 965–975, 2011.
Burton, D. J., Dowdeswell, J. A., Hogan, K. A., and Noormets, R.: Marginal
Fluctuations of a Svalbard Surge-Type Tidewater Glacier, Blomstrandbreen,
Since the Little Ice Age: A Record of Three Surges, Arct. Antarct.
Alp. Res., 48, 411–426, https://doi.org/10.1657/AAAR0014-094, 2016.
Chen, H., Rignot, E., Scheuchl, B., and Ehrenfeucht, S.: Grounding zone of
Amery Ice Shelf, Antarctica, from differential synthetic-aperture radar
interferometry, Geophys. Res. Lett., 50, e2022GL102430,
https://doi.org/10.1029/2022GL102430, 2023.
Christ, A. J., Bierman, P. R., Schaefer, J. M., Dahl-Jensen, D., Steffensen,
J. P., Corbett, L. B., Peteet, D. M., Thomas, E. K., Steig, E. J., and
Rittenour, T. M.: A multimillion-year-old record of Greenland vegetation and
glacial history preserved in sediment beneath 1.4 km of ice at Camp Century,
P. Natl. Acad. Sci. USA, 118, e2021442118, https://doi.org/10.1073/pnas.2021442118, 2021.
Clarke, G. K.: Subglacial till: a physical framework for its properties and
processes, J. Geophys. Res.-Sol. Ea., 92, 9023–9036,
1987.
Davis, P. E. D., Nicholls, K. W., Holland, D. M., Schmidt, B. E., Washam,
P., Riverman, K. L., Arthern, R. J., Vaňková, I., Eayrs, C., Smith,
J. A., Anker, P. G. D., Mullen, A. D., Dichek, D., Lawrence, J. D., Meister,
M. M., Clyne, E., Basinski-Ferris, A., Rignot, E., Queste, B. Y., Boehme,
L., Heywood, K. J., Anandakrishnan, S., and Makinson, K.: Suppressed basal
melting in the eastern Thwaites Glacier grounding zone, Nature, 614,
479–485,
https://doi.org/10.1038/s41586-022-05586-0,
2023.
Dawson, G. and Bamber, J.: Antarctic Grounding Line Mapping From CryoSat-2
Radar Altimetry, Geophys. Res. Lett., 44, 11886–811893, 2017.
Demet, B. P., Nittrouer, J. A., Anderson, J. B., and Simkins, L. M.:
Sedimentary processes at ice sheet grounding-zone wedges revealed by
outcrops, Washington State (USA), Earth Surf. Proc. Land., 44,
1209–1220, 2019.
Domack, E. W.: Laminated terrigenous sediments from the Antarctic Peninsula: the role of subglacial and marine processes, Geological Society, London, Special Publications 53, 91–103, 1990.
Domack, E. W. and Harris, P. T.: A new depositional model for ice shelves,
based upon sediment cores from the Ross Sea and the Mac. Robertson shelf,
Antarctica, Ann. Glaciol., 27, 281–284, 1998.
Domack, E. W., Jacobson, E. A., Shipp, S., and Anderson, J. B.: Late
Pleistocene–Holocene retreat of the West Antarctic Ice-Sheet system in the
Ross Sea: Part 2 – Sedimentologic and stratigraphic signature, GSA Bulletin,
111, 1517–1536, 1999.
Dowdeswell, J. and Fugelli, E.: The seismic architecture and geometry of
grounding-zone wedges formed at the marine margins of past ice sheets,
Bulletin, 124, 1750–1761, 2012.
Dowdeswell, J., Batchelor, C., Montelli, A., Ottesen, D., Christie, F.,
Dowdeswell, E., and Evans, J.: Delicate seafloor landforms reveal past
Antarctic grounding-line retreat of kilometres per year, Science, 368,
1020–1024, 2020.
Dowdeswell, J. A., Cofaigh, C. O., and Pudsey, C. J.: Thickness and extent
of the subglacial till layer beneath an Antarctic paleo–ice stream,
Geology, 32, 13–16, 2004.
Drews, R., Wild, C. T., Marsh, O. J., Rack, T. A.,Ehlers, N., and Helm, V.: Grounding-Zone Flow Variability of Priestley Glacier, Antarctica, in a Diurnal Tidal Regime, Geophys. Res. Lett., 48, e2021GL093853, https://doi.org/10.1029/2021GL093853, 2021.
Engelhardt, H. and Kamb, B.: Basal hydraulic system of a West Antarctic ice
stream: constraints from borehole observations, J. Glaciol., 43,
207–230, 1997.
Engelhardt, H., Humphrey, N., Kamb, B., and Fahnestock, M.: Physical
conditions at the base of a fast moving Antarctic ice stream, Science, 248,
57–59, 1990.
Evans, D. J. A., Phillips, E., Hiemstra, J., and Auton, C.: Subglacial till:
formation, sedimentary characteristics and classification, Earth-Sci.
Rev., 78, 115–176, 2006.
Evans, D. J. A., Hiemstra, J. F., and Ó Cofaigh, C.: An assessment of clast
macrofabrics in glacigenic sediments based on A/B plane data, Geogr. Ann., 89, 103–120,
2007.
Evans, D. J. A., Ewertowski, M., and Orton, C., Fláajökull (north
lobe), Iceland: active temperate piedmont lobe glacial landsystem, J.
Maps, 12, 777–789, https://doi.org/10.1080/17445647.2015.1073185, 2016.
Eyles, N., Eyles, C. H., and Miall, A. D.: Lithofacies types and vertical
profile models; an alternative approach to the description and environmental
interpretation of glacial diamict and diamictite sequences, Sedimentology,
30, 393–410, 1983.
Graham, A.: Gridded multibeam bathymetry data from “The Bump” at Thwaites Glacier, collected by “Ran” Kongsberg Hugin AUV (Kongsberg EM2040), on the RV Nathaniel B. Palmer during cruise NBP19-02 (2019), figshare [data set], https://doi.org/10.6084/m9.figshare.20359920.v1, 2022.
Graham, A. G., Dutrieux, P., Vaughan, D. G., Nitsche, F. O., Gyllencreutz,
R., Greenwood, S. L., Larter, R. D., and Jenkins, A.: Seabed corrugations
beneath an Antarctic ice shelf revealed by autonomous underwater vehicle
survey: origin and implications for the history of Pine Island Glacier,
J. Geophys. Res.-Earth, 118, 1356–1366, 2013.
Graham, A. G. C., Wåhlin, A., Hogan, K. A., Nitsche, F. O., Heywood, K.
J., Minzoni, R., Smith, J. A., Hillenbrand, C.-D., Simkins, L., Wellner, J.
S., and Larter, R. D.: Rapid tidally-modulated retreat of Thwaites Glacier
from a pinning point in the pre-satellite era, Nat. Geosci., 15,
706–713, https://doi.org/10.1038/s41561-022-01019-9, 2022.
Gudmundsson, G. H., Krug, J., Durand, G., Favier, L., and Gagliardini, O.: The stability of grounding lines on retrograde slopes, The Cryosphere, 6, 1497–1505, https://doi.org/10.5194/tc-6-1497-2012, 2012.
Hamilton, E. L. and Bachman, R. T.: Sound velocity and related properties of
marine sediments, J. Acoust. Soc. Am., 72, 1891–1904, 1982.
Hillenbrand, C.-D., Grobe, H., Diekmann, B., Kuhn, G. and D. Fütterer:
Distribution of clay minerals and proxies for productivity in surface
sediments of the Bellingshausen and Amundsen seas (West Antarctica) - Relation to modern environmental conditions, Mar. Geol., 193, 253e271, https://doi.org/10.1016/S0025-3227(02)00659-X,
2003.
Hogan, K. A., Dowdeswell, J. A., and Cofaigh, C. Ó.: Glacimarine sedimentary processes and depositional environments in an embayment fed by West Greenland ice streams, Mar. Geol., 311, 1–16, 2012.
Hogan, K. A., Jakobsson, M., Mayer, L., Reilly, B. T., Jennings, A. E., Stoner, J. S., Nielsen, T., Andresen, K. J., Nørmark, E., Heirman, K. A., Kamla, E., Jerram, K., Stranne, C., and Mix, A.: Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland, The Cryosphere, 14, 261–286, https://doi.org/10.5194/tc-14-261-2020, 2020a.
Hogan, K. A., Larter, R. D., Graham, A. G. C., Arthern, R., Kirkham, J. D., Totten, R. L., Jordan, T. A., Clark, R., Fitzgerald, V., Wåhlin, A. K., Anderson, J. B., Hillenbrand, C.-D., Nitsche, F. O., Simkins, L., Smith, J. A., Gohl, K., Arndt, J. E., Hong, J., and Wellner, J.: Revealing the former bed of Thwaites Glacier using sea-floor bathymetry: implications for warm-water routing and bed controls on ice flow and buttressing, The Cryosphere, 14, 2883–2908, https://doi.org/10.5194/tc-14-2883-2020, 2020b.
Horgan, H. J., Alley, R. B., Christianson, K., Jacobel, R. W.,
Anandakrishnan, S., Muto, A., Beem, L. H., and Siegfried, M. R.: Estuaries
beneath ice sheets, Geology, 41, 1159–1162, 2013.
Horgan, H. J., van Haastrecht, L., Alley, R. B., Anandakrishnan, S., Beem, L. H., Christianson, K., Muto, A., and Siegfried, M. R.: Grounding zone subglacial properties from calibrated active-source seismic methods, The Cryosphere, 15, 1863–1880, https://doi.org/10.5194/tc-15-1863-2021, 2021.
Howard, S. L., Erofeeva, S., and Padman, L.: CATS2008: Circum-Antarctic
Tidal Simulation version 2008, U.S. Antarctic Program (USAP) Data Center [data set],
https://doi.org/10.15784/601235, 2019.
Jakobsson, M., Anderson, J. B., Nitsche, F. O., Dowdeswell, J. A.,
Gyllencreutz, R., Kirchner, N., Mohammad, R., O'Regan, M., Alley, R. B., and
Anandakrishnan, S.: Geological record of ice shelf break-up and grounding
line retreat, Pine Island Bay, West Antarctica, Geology, 39, 691–694, 2011.
Jakobsson, M., Anderson, J. B., Nitsche, F. O., Gyllencreutz, R., Kirshner, A. E., Kirchner, N., O'Regan, M., Mohammed, R., and Eriksson, B.: Ice sheet retreat dynamics inferred from glacial morphology of the central Pine Island Bay Trough, West Antarctica, Quaternary Sci. Rev., 38, 1–10, https://doi.org/10.1016/j.quascirev.2011.12.017, 2012.
Jamieson, S., Vieli, A., Livingstone, S., O Cofaigh, C., Stokes, C., Hillenbrand, C-. D., and Dowdeswell, J. A.: Ice-stream stability on a reverse bed slope. Nature Geosci., 5, 799–802, https://doi.org/10.1038/ngeo1600, 2012.
Kamb, B.: Basal zone of the West Antarctic ice streams and its role in
lubrication of their rapid motion, The West Antarctic ice sheet: behavior
and environment, Antarctic Research Series, 77, 157–199, 2001.
Kirshner, A. E., Anderson, J. B., Jakobsson, M., O'Regan, M., Majewski, W.,
and Nitsche, F. O.: Post-LGM deglaciation in Pine island Bay, west
Antarctica, Quaternary Sci. Rev., 38, 11–26, 2012.
Kowal, K. and Worster, M.: The formation of grounding zone wedges: Theory and experiments, J. Fluid Mech., 898, A12, https://doi.org/10.1017/jfm.2020.393, 2020.
Lindén, M. and Möller, P.: Marginal formation of De Geer moraines
and their implications to the dynamics of grounding-line recession, J.
Quaternary Sci.,
20, 113–133, 2005.
Lurton, X. and Lamarche, G. (Eds): Backscatter measurements by
seafloor-mapping sonars. Guidelines and Recommendations, 200 pp., https://geohab.org/wp-content/uploads/2018/09/BWSG-REPORT-MAY2015.pdf (last access: 14 June 2023), 2015.
McCave, I. N. and Hall, I. R.: Size sorting in marine muds: Processes,
pitfalls, and prospects for paleoflow-speed proxies, Geochem. Geophy.
Geosy., 7, Q10N05, https://doi.org/10.1029/2006GC001284, 2006.
McNeil, J., Taylor, C., and Lick, W.: Measurements of Erosion of Undisturbed
Bottom Sediments with Depth, J. Hydraul. Eng., 122, 316–324,
1996.
Menzies, J.: Micromorphological analyses of microfabrics and microstructures indicative of deformation processes in glacial sediments, Geological Society, London, Special Publications, 176, 24–257, 2000.
Mier, J. M. and Garcia, M. H.: Erosion of glacial till from the St. Clair
River (Great Lakes basin), J. Great Lakes Res., 37, 399–410,
2011.
Milillo, P., Rignot, E., Rizzoli, P., Scheuchl, B., Mouginot, J.,
Bueso-Bello, J. L., Prats-Iraola, P., and Dini, L. J. N. G.: Rapid glacier
retreat rates observed in West Antarctica, Nat. Geosci., 15, 48–53, 2022.
Mohajerani, Y., Jeong, S., Scheuchl, B., Velicogna, I., Rignot, E., and
Milillo, P.: Automatic delineation of glacier grounding lines in
differential interferometric synthetic-aperture radar data using deep
learning, Sci. Rep., 11, 1–10, 2021.
Ottesen, D. and Dowdeswell, J. A.: Assemblages of submarine landforms
produced by tidewater glaciers in Svalbard, J. Geophys. Res.-Earth, 111, F01016, https://doi.org/10.1029/2005JF000330, 2006.
Padman, L., Fricker, H. A., Coleman, R., Howard, S., and Erofeeva, L.: A new
tide model for the Antarctic ice shelves and seas, Ann. Glaciol., 34,
247–254, 2002.
Pegler, S. and Worster, M.: An experimental and theoretical study of the
dynamics of grounding lines, J. Fluid Mech., 728, 5–28,
https://doi.org/10.1017/jfm.2013.269, 2013.
Pike, L., Gaskin, S., and Ashmore, P.: Flume tests on fluvial erosion
mechanisms in till-bed channels, Earth Surf. Proc.
Land., 43, 259–270, 2018.
Powell, R. D., Dawber, M., McInnes, J. N., and Pyne, A. R.: Observations of
the grounding-line area at a floating glacier terminus, Ann.
Glaciol., 22, 217–223, 1996.
Pritchard, H., Ligtenberg, S. R., Fricker, H. A., Vaughan, D. G., van den
Broeke, M. R., and Padman, L.: Antarctic ice-sheet loss driven by basal
melting of ice shelves, Nature, 484, 502–505, 2012.
Pritchard, H. D., Arthern, R. J., Vaughan, D. G., and Edwards, L. A.:
Extensive dynamic thinning on the margins of the Greenland and Antarctic ice
sheets, Nature, 461, 971–975, 2009.
Rea, B. R. and Evans, D. J. A.: An assessment of surge-induced crevassing
and the formation of crevasse squeeze ridges, J. Geophys.
Res.-Earth, 116, F04005, https://doi.org/10.1029/2011JF001970, 2011.
Reinardy, B. T., Larter, R. D., Hillenbrand, C. D., Murray, T., Hiemstra, J. F.
and Booth, A. D.: Streaming flow of an Antarctic Peninsula palaeo-ice stream,
both by basal sliding and deformation of substrate, J.
Glaciol., 57, 596–608, 2011.
Rignot, E., Mouginot, J., and Scheuchl, B.: Antarctic grounding line mapping
from differential satellite radar interferometry, Geophys. Res.
Lett., 38, L10504, https://doi.org/10.1029/2011GL047109, 2011.
Rignot, E., Jacobs, S., Mouginot, J., and Scheuchl, B.: Ice-shelf melting
around Antarctica, Science, 341, 266–270, 2013.
Robel, A. A., Schoof, C., and Tziperman, E.: Rapid grounding line migration
induced by internal ice stream variability, J. Geophys. Res.-Earth, 119, 2430–2447, 2014.
Robel, A., Tsai, V., Minchew, B., and Simons, M.: Tidal modulation of ice shelf
buttressing stresses, Ann. Glaciol., 58, 12–20,
https://doi.org/10.1017/aog.2017.22, 2017.
Sayag, R. and Worster, M. G.: Elastic dynamics and tidal migration of
grounding lines modify subglacial lubrication and melting, Geophys.
Res. Lett., 40, 5877–5881, 2013.
Sayag, R. and Worster, M. G.: Elastic response of a grounded ice sheet
coupled to a floating ice shelf, Phys. Rev. E, 84, 036111, https://doi.org/10.1103/PhysRevE.84.036111, 2011.
Schoof, C.: Ice sheet grounding line dynamics: Steady states, stability, and
hysteresis, J. Geophys. Res.-Earth, 112, F03S28, https://doi.org/10.1029/2006JF000664, 2007.
Shackleton, C. S., Winsborrow, M. C., Andreassen, K., Lucchi, R. G., and
Bjarnadóttir, L. R.: Ice-margin retreat and grounding-zone dynamics
during initial deglaciation of the Storfjordrenna Ice Stream, western
Barents Sea, Boreas, 49, 38–51, 2020.
Simkins, L. M., Greenwood, S. L., and Anderson, J. B.: Diagnosing ice sheet grounding line stability from landform morphology, The Cryosphere, 12, 2707–2726, https://doi.org/10.5194/tc-12-2707-2018, 2018.
Smith, B., Fricker, H. A., Gardner, A. S., Medley, B., Nilsson, J., Paolo,
F. S., Holschuh, N., Adusumilli, S., Brunt, K., Csatho, B., Harbeck, K.,
Markus, T., Neumann, T., Siegfried, M. R., and Zwally, H. J.: Pervasive ice
sheet mass loss reflects competing ocean and atmosphere processes, Science, 368,
1239–1242, 2020.
Smith, J. A., Hillenbrand, C.-D., Kuhn, G., Larter, R. D., Graham, A. G. C.,
Ehrmann, W., Moreton, S. G., and Forwick, M.: Deglacial history of the West
Antarctic Ice Sheet in the western Amundsen Sea Embayment, Quaternary
Sci. Rev., 30, 488–505, 2011.
Smith, J. A., Hillenbrand, C.-D., Kuhn, G., Klages, J. P., Graham, A. G. C.,
Larter, R. D., Ehrmann, W., Moreton, S. G., Wiers, S., and Frederichs, T.:
New constraints on the timing of West Antarctic Ice Sheet retreat in the
eastern Amundsen Sea since the Last Glacial Maximum, Global Planet.
Change, 122, 224–237, https://doi.org/10.1016/j.gloplacha.2014.07.015, 2013.
Smith, J. A., Graham, A. G., Post, A. L., Hillenbrand, C.-D., Bart, P. J.,
and Powell, R. D.: The marine geological imprint of Antarctic ice shelves,
Nat. Commun., 10, 1–16, 2019.
Sugiyama, S., Sawagaki, T., Fukuda, T., and Aoki, S.: Active water exchange
and life near the grounding line of an Antarctic outlet glacier, Earth
Planet. Sc. Lett., 399, 52–60, 2014.
Thomas, R. H.: The dynamics of marine ice sheets, J. Glaciol., 24,
167–177, 1979.
Todd, B. J., Valentine, P. C., Longva, O., And Shaw, J.: Glacial landforms
on German Bank, Scotian Shelf: evidence for Late Wisconsinan ice-sheet
dynamics and implications for the formation of De Geer moraines, Boreas, 36,
148–169, 2007.
Tsai, V. C. and Gudmundsson, G. H.: An improved model for tidally modulated
grounding-line migration, J. Glaciol., 61, 216–222, 2015.
Tulaczyk, S., Kamb, B., Scherer, R. P., and Engelhardt, H. F.: Sedimentary
processes at the base of a West Antarctic ice stream; constraints from
textural and compositional properties of subglacial debris, J.
Sediment. Res., 68, 487–496, 1998.
van der Meer, J. J., Menzies, J., and Rose, J.: Subglacial till: the
deforming glacier bed, Quaternary Sci. Rev., 22, 1659–1685, 2003.
Walker, R. T., Parizek, B. R., Alley, R. B., Anandakrishnan, S., Riverman, K. L., and Christianson, K.: Ice-shelf tidal flexure and subglacial pressure variations, Earth Planet. Sc. Lett., 361, 422–428, https://doi.org/10.1016/j.epsl.2012.11.08, 2013.
Warburton, K., Hewitt, D., and Neufeld, J.: Research data supporting Towards modelling of corrugation ridges at ice-sheet grounding lines, Apollo – University of Cambridge Repository [data set], https://doi.org/10.17863/CAM.96524, 2023.
Warburton, K. L. P., Hewitt, D. R., and Neufeld, J. A.: Tidal Grounding-Line
Migration Modulated by Subglacial Hydrology, Geophys. Res. Lett.,
47, e2020GL089088, https://doi.org/10.1029/2020GL089088, 2020.
Short summary
Delicate sea floor ridges – corrugation ridges – that form by tidal motion at Antarctic grounding lines record extremely fast retreat of ice streams in the past. Here we use a mathematical model, constrained by real-world observations from Thwaites Glacier, West Antarctica, to explore how corrugation ridges form. We identify
till extrusion, whereby deformable sediment is squeezed out from under the ice like toothpaste as it settles down at each low-tide position, as the most likely process.
Delicate sea floor ridges – corrugation ridges – that form by tidal motion at Antarctic...
