Articles | Volume 14, issue 9
https://doi.org/10.5194/tc-14-2883-2020
© Author(s) 2020. 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-14-2883-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Sep 2020
Research article |
| 09 Sep 2020
| 09 Sep 2020
Revealing the former bed of Thwaites Glacier using sea-floor bathymetry: implications for warm-water routing and bed controls on ice flow and buttressing
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Robert D. Larter
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Alastair G. C. Graham
College of
Marine Science, University of South Florida, Saint Petersburg, FL 33701, USA
Robert Arthern
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
James D. Kirkham
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Scott Polar Research Institute, University of Cambridge, Lensfield
Road, Cambridge, CB2 1ER, UK
Rebecca L. Totten
Department of Geological Sciences, University of Alabama, Tuscaloosa,
AL 35487, USA
Tom A. Jordan
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Rachel Clark
Department of Earth and Atmospheric Sciences, University of Houston,
Houston, TX 77204, USA
Victoria Fitzgerald
Department of Geological Sciences, University of Alabama, Tuscaloosa,
AL 35487, USA
Anna K. Wåhlin
Department of Marine Sciences, University of Gothenburg, 40530
Göteborg, Sweden
John B. Anderson
Department of Earth Science, Rice University, Houston, TX 77005, USA
Claus-Dieter Hillenbrand
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Frank O. Nitsche
Lamont-Doherty Earth Observatory, Columbia University, Palisades, New
York, NY, USA
Lauren Simkins
Department of Environmental Sciences, University of Virginia,
Charlottesville, VA 22904, USA
James A. Smith
British Antarctic Survey, Natural Environment Research Council,
High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Karsten Gohl
Alfred Wegener Institute Helmholtz-Centre for Polar and Marine
Research, 27568 Bremerhaven, Germany
Jan Erik Arndt
Alfred Wegener Institute Helmholtz-Centre for Polar and Marine
Research, 27568 Bremerhaven, Germany
Jongkuk Hong
Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of
Korea
Julia Wellner
Department of Earth and Atmospheric Sciences, University of Houston,
Houston, TX 77204, USA
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The thickness of palaeo-ice on the calving front around the LGM was estimated to be at least 305 to 320 m.
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Romana Melis, Lucilla Capotondi, Fiorenza Torricella, Patrizia Ferretti, Andrea Geniram, Jong Kuk Hong, Gerhard Kuhn, Boo-Keun Khim, Sookwan Kim, Elisa Malinverno, Kyu Cheul Yoo, and Ester Colizza
J. Micropalaeontol., 40, 15–35, https://doi.org/10.5194/jm-40-15-2021, https://doi.org/10.5194/jm-40-15-2021, 2021
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Integrated micropaleontological (planktic and benthic foraminifera, diatoms, and silicoflagellates) analysis, together with textural and geochemical results of a deep-sea core from the Hallett Ridge (northwestern Ross Sea), provides new data for late Quaternary (23–2 ka) paleoenvironmental and paleoceanographic reconstructions of this region. Results allow us to identify three time intervals: the glacial–deglacial transition, the deglacial period, and the interglacial period.
Chris S. M. Turney, Richard T. Jones, Nicholas P. McKay, Erik van Sebille, Zoë A. Thomas, Claus-Dieter Hillenbrand, and Christopher J. Fogwill
Earth Syst. Sci. Data, 12, 3341–3356, https://doi.org/10.5194/essd-12-3341-2020, https://doi.org/10.5194/essd-12-3341-2020, 2020
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The Last Interglacial (129–116 ka) experienced global temperatures and sea levels higher than today. The direct contribution of warmer conditions to global sea level (thermosteric) are uncertain. We report a global network of sea surface temperatures. We find mean global annual temperature anomalies of 0.2 ± 0.1˚C and an early maximum peak of 0.9 ± 0.1˚C. Our reconstruction suggests warmer waters contributed on average 0.08 ± 0.1 m and a peak contribution of 0.39 ± 0.1 m to global sea level.
David R. Cox, Paul C. Knutz, D. Calvin Campbell, John R. Hopper, Andrew M. W. Newton, Mads Huuse, and Karsten Gohl
Sci. Dril., 28, 1–27, https://doi.org/10.5194/sd-28-1-2020, https://doi.org/10.5194/sd-28-1-2020, 2020
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A workflow is presented that uses 3D subsurface image (seismic) data to identify and avoid potential geological hazards, in order to increase safety and minimize the risk associated with selecting offshore scientific drilling locations. The workflow has been implemented for a scientific drilling expedition proposal within a challenging region offshore north-western Greenland and resulted in an improved understanding of subsurface hazards and a reduction of risk across all selected drill sites.
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.
Stephen L. Cornford, Helene Seroussi, Xylar S. Asay-Davis, G. Hilmar Gudmundsson, Rob Arthern, Chris Borstad, Julia Christmann, Thiago Dias dos Santos, Johannes Feldmann, Daniel Goldberg, Matthew J. Hoffman, Angelika Humbert, Thomas Kleiner, Gunter Leguy, William H. Lipscomb, Nacho Merino, Gaël Durand, Mathieu Morlighem, David Pollard, Martin Rückamp, C. Rosie Williams, and Hongju Yu
The Cryosphere, 14, 2283–2301, https://doi.org/10.5194/tc-14-2283-2020, https://doi.org/10.5194/tc-14-2283-2020, 2020
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We present the results of the third Marine Ice Sheet Intercomparison Project (MISMIP+). MISMIP+ is one in a series of exercises that test numerical models of ice sheet flow in simple situations. This particular exercise concentrates on the response of ice sheet models to the thinning of their floating ice shelves, which is of interest because numerical models are currently used to model the response to contemporary and near-future thinning in Antarctic ice shelves.
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.
Wei Wei, Donald D. Blankenship, Jamin S. Greenbaum, Noel Gourmelen, Christine F. Dow, Thomas G. Richter, Chad A. Greene, Duncan A. Young, SangHoon Lee, Tae-Wan Kim, Won Sang Lee, and Karen M. Assmann
The Cryosphere, 14, 1399–1408, https://doi.org/10.5194/tc-14-1399-2020, https://doi.org/10.5194/tc-14-1399-2020, 2020
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Getz Ice Shelf is the largest meltwater source from Antarctica of the Southern Ocean. This study compares the relative importance of the meltwater production of Getz from both ocean and subglacial sources. We show that basal melt rates are elevated where bathymetric troughs provide pathways for warm Circumpolar Deep Water to enter the Getz Ice Shelf cavity. In particular, we find that subshelf melting is enhanced where subglacially discharged fresh water flows across the grounding line.
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.
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
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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.
Robert McKay, Neville Exon, Dietmar Müller, Karsten Gohl, Michael Gurnis, Amelia Shevenell, Stuart Henrys, Fumio Inagaki, Dhananjai Pandey, Jessica Whiteside, Tina van de Flierdt, Tim Naish, Verena Heuer, Yuki Morono, Millard Coffin, Marguerite Godard, Laura Wallace, Shuichi Kodaira, Peter Bijl, Julien Collot, Gerald Dickens, Brandon Dugan, Ann G. Dunlea, Ron Hackney, Minoru Ikehara, Martin Jutzeler, Lisa McNeill, Sushant Naik, Taryn Noble, Bradley Opdyke, Ingo Pecher, Lowell Stott, Gabriele Uenzelmann-Neben, Yatheesh Vadakkeykath, and Ulrich G. Wortmann
Sci. Dril., 24, 61–70, https://doi.org/10.5194/sd-24-61-2018, https://doi.org/10.5194/sd-24-61-2018, 2018
Lauren M. Simkins, Sarah L. Greenwood, and John B. Anderson
The Cryosphere, 12, 2707–2726, https://doi.org/10.5194/tc-12-2707-2018, https://doi.org/10.5194/tc-12-2707-2018, 2018
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Using thousands of grounding line landforms in the Ross Sea, Antarctica, we observe two distinct landform types associated with contrasting styles of grounding line retreat. We characterise landform morphology, examine factors that control landform morphology and distribution, and explore drivers of grounding line (in)stability. This study highlights the importance of understanding thresholds which may destabilise a system and of controls on grounding line retreat over a range of timescales.
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
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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.
Yuribia P. Munoz and Julia S. Wellner
The Cryosphere, 12, 205–225, https://doi.org/10.5194/tc-12-205-2018, https://doi.org/10.5194/tc-12-205-2018, 2018
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We mapped submarine landforms in western Antarctic Peninsula bays. These landforms were formed by flowing ice and provide insight into the local controls on glacial ice advance and retreat. We combined data from various cruises to create seafloor maps. We conclude that the number of landforms found in the bays scales to the size of the bay, narrower bays tend to stabilize ice flow, and meltwater channels are abundant, and we hypothesize a recent glacial advance, likely the Little Ice Age.
Janin Schaffer, Ralph Timmermann, Jan Erik Arndt, Steen Savstrup Kristensen, Christoph Mayer, Mathieu Morlighem, and Daniel Steinhage
Earth Syst. Sci. Data, 8, 543–557, https://doi.org/10.5194/essd-8-543-2016, https://doi.org/10.5194/essd-8-543-2016, 2016
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The RTopo-2 data set provides consistent maps of global ocean bathymetry and ice surface topographies for Greenland and Antarctica at 30 arcsec grid spacing. We corrected data from earlier products in the areas of Petermann, Hagen Bræ, and Helheim glaciers, incorporated original data for the floating ice tongue of Nioghalvfjerdsfjorden Glacier, and applied corrections for the geometry of Getz, Abbot, and Fimbul ice shelf cavities. The data set is available from the PANGAEA database.
Anna Ruth W. Halberstadt, Lauren M. Simkins, Sarah L. Greenwood, and John B. Anderson
The Cryosphere, 10, 1003–1020, https://doi.org/10.5194/tc-10-1003-2016, https://doi.org/10.5194/tc-10-1003-2016, 2016
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Geomorphic features on the Ross Sea sea floor provide a record of ice-sheet behaviour during the Last Glacial Maximum and subsequent retreat. Based on extensive mapping of these glacial landforms, a large embayment formed in the eastern Ross Sea. This was followed by complex, late-stage retreat in the western Ross Sea where banks stabilised the ice sheet. Physiography and sea floor geology act as regional controls on ice-sheet dynamics across the Ross Sea.
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. S. Wellner
Sci. Dril., 18, 11–11, https://doi.org/10.5194/sd-18-11-2014, https://doi.org/10.5194/sd-18-11-2014, 2014
K. Hochmuth, K. Gohl, G. Uenzelmann-Neben, and R. Werner
Solid Earth Discuss., https://doi.org/10.5194/sed-6-1863-2014, https://doi.org/10.5194/sed-6-1863-2014, 2014
Revised manuscript not accepted
B. Dorschel, J. Gutt, D. Piepenburg, M. Schröder, and J. E. Arndt
Biogeosciences, 11, 3797–3817, https://doi.org/10.5194/bg-11-3797-2014, https://doi.org/10.5194/bg-11-3797-2014, 2014
H. Fischer, J. Severinghaus, E. Brook, E. Wolff, M. Albert, O. Alemany, R. Arthern, C. Bentley, D. Blankenship, J. Chappellaz, T. Creyts, D. Dahl-Jensen, M. Dinn, M. Frezzotti, S. Fujita, H. Gallee, R. Hindmarsh, D. Hudspeth, G. Jugie, K. Kawamura, V. Lipenkov, H. Miller, R. Mulvaney, F. Parrenin, F. Pattyn, C. Ritz, J. Schwander, D. Steinhage, T. van Ommen, and F. Wilhelms
Clim. Past, 9, 2489–2505, https://doi.org/10.5194/cp-9-2489-2013, https://doi.org/10.5194/cp-9-2489-2013, 2013
F. O. Nitsche, K. Gohl, R. D. Larter, C.-D. Hillenbrand, G. Kuhn, J. A. Smith, S. Jacobs, J. B. Anderson, and M. Jakobsson
The Cryosphere, 7, 249–262, https://doi.org/10.5194/tc-7-249-2013, https://doi.org/10.5194/tc-7-249-2013, 2013
Related subject area
Discipline: Ice sheets | Subject: Antarctic
Thwaites Glacier thins and retreats fastest where ice-shelf channels intersect its grounding zone
Melt sensitivity of irreversible retreat of Pine Island Glacier
A model framework for atmosphere–snow water vapor exchange and the associated isotope effects at Dome Argus, Antarctica – Part 1: The diurnal changes
The long-term sea-level commitment from Antarctica
The influence of present-day regional surface mass balance uncertainties on the future evolution of the Antarctic Ice Sheet
How well can satellite altimetry and firn models resolve Antarctic firn thickness variations?
Feedback mechanisms controlling Antarctic glacial-cycle dynamics simulated with a coupled ice sheet–solid Earth model
The effect of ice shelf rheology on shelf edge bending
Hysteresis of idealized, instability-prone outlet glaciers in response to pinning-point buttressing variation
A physics-based Antarctic melt detection technique: combining Advanced Microwave Scanning Radiometer 2, radiative-transfer modeling, and firn modeling
Brief communication: Precision measurement of the index of refraction of deep glacial ice at radio frequencies at Summit Station, Greenland
Widespread increase in discharge from west Antarctic Peninsula glaciers since 2018
Surface dynamics and history of the calving cycle of Astrolabe Glacier (Adélie Coast, Antarctica) derived from satellite imagery
Detecting Holocene retreat and readvance in the Amundsen Sea sector of Antarctica: assessing the suitability of sites near Pine Island Glacier for subglacial bedrock drilling
Weak relationship between remotely detected crevasses and inferred ice rheological parameters on Antarctic ice shelves
Extensive palaeo-surfaces beneath the Evans–Rutford region of the West Antarctic Ice Sheet control modern and past ice flow
Towards the systematic reconnaissance of seismic signals from glaciers and ice sheets – Part 1: Event detection for cryoseismology
Towards the systematic reconnaissance of seismic signals from glaciers and ice sheets – Part 2: Unsupervised learning for source process characterization
Geometric amplification and suppression of ice-shelf basal melt in West Antarctica
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology
A fast and unified subglacial hydrological model applied to Thwaites Glacier, Antarctica
Impact of boundary conditions on the modeled thermal regime of the Antarctic ice sheet
The staggered retreat of grounded ice in the Ross Sea, Antarctica, since the Last Glacial Maximum (LGM)
The effect of landfast sea ice buttressing on ice dynamic speedup in the Larsen B embayment, Antarctica
ISMIP6-based Antarctic Projections to 2100: simulations with the BISICLES ice sheet model
Meteoric water and glacial melt in the southeastern Amundsen Sea: a time series from 1994 to 2020
Evaporative controls on Antarctic precipitation: an ECHAM6 model study using innovative water tracer diagnostics
Disentangling the drivers of future Antarctic ice loss with a historically calibrated ice-sheet model
Modelling GNSS-observed seasonal velocity changes of the Ross Ice Shelf, Antarctica, using the Ice-sheet and Sea-level System Model (ISSM)
Insights into the vulnerability of Antarctic glaciers from the ISMIP6 ice sheet model ensemble and associated uncertainty
Evaluation of four calving laws for Antarctic ice shelves
Oceanic gateways in Antarctica – Impact of relative sea-level change on sub-shelf melt
Englacial architecture of Lambert Glacier, East Antarctica
Mass changes of the northern Antarctic Peninsula Ice Sheet derived from repeat bi-static synthetic aperture radar acquisitions for the period 2013–2017
The evolution of future Antarctic surface melt using PISM-dEBM-simple
Characteristics and rarity of the strong 1940s westerly wind event over the Amundsen Sea, West Antarctica
Sensitivity of the MAR regional climate model snowpack to the parameterization of the assimilation of satellite-derived wet-snow masks on the Antarctic Peninsula
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica
Modes of Antarctic tidal grounding line migration revealed by Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) laser altimetry
Evaluating the impact of enhanced horizontal resolution over the Antarctic domain using a variable-resolution Earth system model
Statistically parameterizing and evaluating a positive degree-day model to estimate surface melt in Antarctica from 1979 to 2022
Widespread slowdown in thinning rates of West Antarctic ice shelves
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations
Revisiting temperature sensitivity: how does Antarctic precipitation change with temperature?
Cosmogenic-nuclide data from Antarctic nunataks can constrain past ice sheet instabilities
Exploring ice sheet model sensitivity to ocean thermal forcing and basal sliding using the Community Ice Sheet Model (CISM)
High mid-Holocene accumulation rates over West Antarctica inferred from a pervasive ice-penetrating radar reflector
Seasonal and interannual variability of the landfast ice mass balance between 2009 and 2018 in Prydz Bay, East Antarctica
Megadunes in Antarctica: migration and characterization from remote and in situ observations
Slowdown of Shirase Glacier, East Antarctica, caused by strengthening alongshore winds
Allison M. Chartrand, Ian M. Howat, Ian R. Joughin, and Benjamin E. Smith
The Cryosphere, 18, 4971–4992, https://doi.org/10.5194/tc-18-4971-2024, https://doi.org/10.5194/tc-18-4971-2024, 2024
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This study uses high-resolution remote-sensing data to show that shrinking of the West Antarctic Thwaites Glacier’s ice shelf (floating extension) is exacerbated by several sub-ice-shelf meltwater channels that form as the glacier transitions from full contact with the seafloor to fully floating. In mapping these channels, the position of the transition zone, and thinning rates of the Thwaites Glacier, this work elucidates important processes driving its rapid contribution to sea level rise.
Brad Reed, J. A. Mattias Green, Adrian Jenkins, and G. Hilmar Gudmundsson
The Cryosphere, 18, 4567–4587, https://doi.org/10.5194/tc-18-4567-2024, https://doi.org/10.5194/tc-18-4567-2024, 2024
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We use a numerical ice-flow model to simulate the response of a 1940s Pine Island Glacier to changes in melting beneath its ice shelf. A decadal period of warm forcing is sufficient to push the glacier into an unstable, irreversible retreat from its long-term position on a subglacial ridge to an upstream ice plain. This retreat can only be stopped when unrealistic cold forcing is applied. These results show that short warm anomalies can lead to quick and substantial increases in ice flux.
Tianming Ma, Zhuang Jiang, Minghu Ding, Pengzhen He, Yuansheng Li, Wenqian Zhang, and Lei Geng
The Cryosphere, 18, 4547–4565, https://doi.org/10.5194/tc-18-4547-2024, https://doi.org/10.5194/tc-18-4547-2024, 2024
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We constructed a box model to evaluate the isotope effects of atmosphere–snow water vapor exchange at Dome A, Antarctica. The results show clear and invisible diurnal changes in surface snow isotopes under summer and winter conditions, respectively. The model also predicts that the annual net effects of atmosphere–snow water vapor exchange would be overall enrichments in snow isotopes since the effects in summer appear to be greater than those in winter at the study site.
Ann Kristin Klose, Violaine Coulon, Frank Pattyn, and Ricarda Winkelmann
The Cryosphere, 18, 4463–4492, https://doi.org/10.5194/tc-18-4463-2024, https://doi.org/10.5194/tc-18-4463-2024, 2024
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We systematically assess the long-term sea-level response from Antarctica to warming projected over the next centuries, using two ice-sheet models. We show that this committed Antarctic sea-level contribution is substantially higher than the transient sea-level change projected for the coming decades. A low-emission scenario already poses considerable risk of multi-meter sea-level increase over the next millennia, while additional East Antarctic ice loss unfolds under the high-emission pathway.
Christian Wirths, Thomas F. Stocker, and Johannes C. R. Sutter
The Cryosphere, 18, 4435–4462, https://doi.org/10.5194/tc-18-4435-2024, https://doi.org/10.5194/tc-18-4435-2024, 2024
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We investigated the influence of several regional climate models on the Antarctic Ice Sheet when applied as forcing for the Parallel Ice Sheet Model (PISM). Our study shows that the choice of regional climate model forcing results in uncertainties of around a tenth of those in future sea level rise projections and also affects the extent of grounding line retreat in West Antarctica.
Maria T. Kappelsberger, Martin Horwath, Eric Buchta, Matthias O. Willen, Ludwig Schröder, Sanne B. M. Veldhuijsen, Peter Kuipers Munneke, and Michiel R. van den Broeke
The Cryosphere, 18, 4355–4378, https://doi.org/10.5194/tc-18-4355-2024, https://doi.org/10.5194/tc-18-4355-2024, 2024
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The interannual variations in the height of the Antarctic Ice Sheet (AIS) are mainly due to natural variations in snowfall. Precise knowledge of these variations is important for the detection of any long-term climatic trends in AIS surface elevation. We present a new product that spatially resolves these height variations over the period 1992–2017. The product combines the strengths of atmospheric modeling results and satellite altimetry measurements.
Torsten Albrecht, Meike Bagge, and Volker Klemann
The Cryosphere, 18, 4233–4255, https://doi.org/10.5194/tc-18-4233-2024, https://doi.org/10.5194/tc-18-4233-2024, 2024
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We performed coupled ice sheet–solid Earth simulations and discovered a positive (forebulge) feedback mechanism for advancing grounding lines, supporting a larger West Antarctic Ice Sheet during the Last Glacial Maximum. During deglaciation we found that the stabilizing glacial isostatic adjustment feedback dominates grounding-line retreat in the Ross Sea, with a weak Earth structure. This may have consequences for present and future ice sheet stability and potential rates of sea-level rise.
W. Roger Buck
The Cryosphere, 18, 4165–4176, https://doi.org/10.5194/tc-18-4165-2024, https://doi.org/10.5194/tc-18-4165-2024, 2024
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Standard theory predicts that the edge of an ice shelf should bend downward. Satellite observations show that the edges of many ice shelves bend upward. A new theory for ice shelf bending is developed that, for the first time, includes the kind of vertical variations in ice flow properties expected for ice shelves. Upward bending of shelf edges is predicted as long as the ice surface is very cold and the ice flow properties depend strongly on temperature.
Johannes Feldmann, Anders Levermann, and Ricarda Winkelmann
The Cryosphere, 18, 4011–4028, https://doi.org/10.5194/tc-18-4011-2024, https://doi.org/10.5194/tc-18-4011-2024, 2024
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Here we show in simplified simulations that the (ir)reversibility of the retreat of instability-prone, Antarctica-type glaciers can strongly depend on the depth of the bed depression they rest on. If it is sufficiently deep, then the destabilized glacier does not recover from its collapsed state. Our results suggest that glaciers resting on a wide and deep bed depression, such as Antarctica's Thwaites Glacier, are particularly susceptible to irreversible retreat.
Marissa E. Dattler, Brooke Medley, and C. Max Stevens
The Cryosphere, 18, 3613–3631, https://doi.org/10.5194/tc-18-3613-2024, https://doi.org/10.5194/tc-18-3613-2024, 2024
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We developed an algorithm based on combining models and satellite observations to identify the presence of surface melt on the Antarctic Ice Sheet. We find that this method works similarly to previous methods by assessing 13 sites and the Larsen C ice shelf. Unlike previous methods, this algorithm is based on physical parameters, and updates to this method could allow the meltwater present on the Antarctic Ice Sheet to be quantified instead of simply detected.
Christoph Welling and The RNO-G Collaboration
The Cryosphere, 18, 3433–3437, https://doi.org/10.5194/tc-18-3433-2024, https://doi.org/10.5194/tc-18-3433-2024, 2024
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We report on the measurement of the index of refraction in glacial ice at radio frequencies. We show that radio echoes from within the ice can be associated with specific features of the ice conductivity and use this to determine the wave velocity. This measurement is especially relevant for the Radio Neutrino Observatory Greenland (RNO-G), a neutrino detection experiment currently under construction at Summit Station, Greenland.
Benjamin J. Davison, Anna E. Hogg, Carlos Moffat, Michael P. Meredith, and Benjamin J. Wallis
The Cryosphere, 18, 3237–3251, https://doi.org/10.5194/tc-18-3237-2024, https://doi.org/10.5194/tc-18-3237-2024, 2024
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Using a new dataset of ice motion, we observed glacier acceleration on the west coast of the Antarctic Peninsula. The speed-up began around January 2021, but some glaciers sped up earlier or later. Using a combination of ship-based ocean temperature observations and climate models, we show that the speed-up coincided with a period of unusually warm air and ocean temperatures in the region.
Floriane Provost, Dimitri Zigone, Emmanuel Le Meur, Jean-Philippe Malet, and Clément Hibert
The Cryosphere, 18, 3067–3079, https://doi.org/10.5194/tc-18-3067-2024, https://doi.org/10.5194/tc-18-3067-2024, 2024
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The recent calving of Astrolabe Glacier in November 2021 presents an opportunity to better understand the processes leading to ice fracturing. Optical-satellite imagery is used to retrieve the calving cycle of the glacier ice tongue and to measure the ice velocity and strain rates in order to document fracture evolution. We observed that the presence of sea ice for consecutive years has favoured the glacier extension but failed to inhibit the growth of fractures that accelerated in June 2021.
Joanne S. Johnson, John Woodward, Ian Nesbitt, Kate Winter, Seth Campbell, Keir A. Nichols, Ryan A. Venturelli, Scott Braddock, Brent M. Goehring, Brenda Hall, Dylan H. Rood, and Greg Balco
EGUsphere, https://doi.org/10.5194/egusphere-2024-1452, https://doi.org/10.5194/egusphere-2024-1452, 2024
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Determining where and when the Antarctic ice sheet was smaller than present requires recovery and exposure dating of subglacial bedrock. Here we use ice sheet model outputs and field data (geological and glaciological observations, bedrock samples and ground-penetrating radar from subglacial ridges) to assess the suitability for drilling of sites in the Hudson Mountains, West Antarctica. We find that no sites are perfect, but two are feasible, with the most suitable being Winkie Nunatak.
Cristina Gerli, Sebastian Rosier, G. Hilmar Gudmundsson, and Sainan Sun
The Cryosphere, 18, 2677–2689, https://doi.org/10.5194/tc-18-2677-2024, https://doi.org/10.5194/tc-18-2677-2024, 2024
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Recent efforts have focused on using AI and satellite imagery to track crevasses for assessing ice shelf damage and informing ice flow models. Our study reveals a weak connection between these observed products and damage maps inferred from ice flow models. While there is some improvement in crevasse-dense regions, this association remains limited. Directly mapping ice damage from satellite observations may not significantly improve the representation of these processes within ice flow models.
Charlotte M. Carter, Michael J. Bentley, Stewart S. R. Jamieson, Guy J. G. Paxman, Tom A. Jordan, Julien A. Bodart, Neil Ross, and Felipe Napoleoni
The Cryosphere, 18, 2277–2296, https://doi.org/10.5194/tc-18-2277-2024, https://doi.org/10.5194/tc-18-2277-2024, 2024
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We use radio-echo sounding data to investigate the presence of flat surfaces beneath the Evans–Rutford region in West Antarctica. These surfaces may be what remains of laterally continuous surfaces, formed before the inception of the West Antarctic Ice Sheet, and we assess two hypotheses for their formation. Tectonic structures in the region may have also had a control on the growth of the ice sheet by focusing ice flow into troughs adjoining these surfaces.
Rebecca B. Latto, Ross J. Turner, Anya M. Reading, and J. Paul Winberry
The Cryosphere, 18, 2061–2079, https://doi.org/10.5194/tc-18-2061-2024, https://doi.org/10.5194/tc-18-2061-2024, 2024
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The study of icequakes allows for investigation of many glacier processes that are unseen by typical reconnaissance methods. However, detection of such seismic signals is challenging due to low signal-to-noise levels and diverse source mechanisms. Here we present a novel algorithm that is optimized to detect signals from a glacier environment. We apply the algorithm to seismic data recorded in the 2010–2011 austral summer from the Whillans Ice Stream and evaluate the resulting event catalogue.
Rebecca B. Latto, Ross J. Turner, Anya M. Reading, Sue Cook, Bernd Kulessa, and J. Paul Winberry
The Cryosphere, 18, 2081–2101, https://doi.org/10.5194/tc-18-2081-2024, https://doi.org/10.5194/tc-18-2081-2024, 2024
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Seismic catalogues are potentially rich sources of information on glacier processes. In a companion study, we constructed an event catalogue for seismic data from the Whillans Ice Stream. Here, we provide a semi-automated workflow for consistent catalogue analysis using an unsupervised cluster analysis. We discuss the defining characteristics of identified signal types found in this catalogue and possible mechanisms for the underlying glacier processes and noise sources.
Jan De Rydt and Kaitlin Naughten
The Cryosphere, 18, 1863–1888, https://doi.org/10.5194/tc-18-1863-2024, https://doi.org/10.5194/tc-18-1863-2024, 2024
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The West Antarctic Ice Sheet is losing ice at an accelerating pace. This is largely due to the presence of warm ocean water around the periphery of the Antarctic continent, which melts the ice. It is generally assumed that the strength of this process is controlled by the temperature of the ocean. However, in this study we show that an equally important role is played by the changing geometry of the ice sheet, which affects the strength of the ocean currents and thereby the melt rates.
Edmund J. Lea, Stewart S. R. Jamieson, and Michael J. Bentley
The Cryosphere, 18, 1733–1751, https://doi.org/10.5194/tc-18-1733-2024, https://doi.org/10.5194/tc-18-1733-2024, 2024
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We use the ice surface expression of the Gamburtsev Subglacial Mountains in East Antarctica to map the horizontal pattern of valleys and ridges in finer detail than possible from previous methods. In upland areas, valleys are spaced much less than 5 km apart, with consequences for the distribution of melting at the bed and hence the likelihood of ancient ice being preserved. Automated mapping techniques were tested alongside manual approaches, with a hybrid approach recommended for future work.
Elise Kazmierczak, Thomas Gregov, Violaine Coulon, and Frank Pattyn
EGUsphere, https://doi.org/10.5194/egusphere-2024-466, https://doi.org/10.5194/egusphere-2024-466, 2024
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We introduce a new fast model for the water flow beneath the ice sheet capable of handling in a unified way various hydrological and bed conditions. Applying this model to Thwaites Glacier, we show that accounting for this water flow in ice-sheet model projections has the potential to greatly increase the contribution to future sea-level rise. We also demonstrate that the sensitivity of the ice sheet in response to external changes depends on both the efficiency of the drainage and the bed type.
In-Woo Park, Emilia Kyung Jin, Mathieu Morlighem, and Kang-Kun Lee
The Cryosphere, 18, 1139–1155, https://doi.org/10.5194/tc-18-1139-2024, https://doi.org/10.5194/tc-18-1139-2024, 2024
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This study conducted 3D thermodynamic ice sheet model experiments, and modeled temperatures were compared with 15 observed borehole temperature profiles. We found that using incompressibility of ice without sliding agrees well with observed temperature profiles in slow-flow regions, while incorporating sliding in fast-flow regions captures observed temperature profiles. Also, the choice of vertical velocity scheme has a greater impact on the shape of the modeled temperature profile.
Matthew A. Danielson and Philip J. Bart
The Cryosphere, 18, 1125–1138, https://doi.org/10.5194/tc-18-1125-2024, https://doi.org/10.5194/tc-18-1125-2024, 2024
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The post-Last Glacial Maximum (LGM) retreat of the West Antarctic Ice Sheet in the Ross Sea was more significant than for any other Antarctic sector. Here we combined the available dates of retreat with new mapping of sediment deposited by the ice sheet during overall retreat. Our work shows that the post-LGM retreat through the Ross Sea was not uniform. This uneven retreat can cause instability in the present-day Antarctic ice sheet configuration and lead to future runaway retreat.
Trystan Surawy-Stepney, Anna E. Hogg, Stephen L. Cornford, Benjamin J. Wallis, Benjamin J. Davison, Heather L. Selley, Ross A. W. Slater, Elise K. Lie, Livia Jakob, Andrew Ridout, Noel Gourmelen, Bryony I. D. Freer, Sally F. Wilson, and Andrew Shepherd
The Cryosphere, 18, 977–993, https://doi.org/10.5194/tc-18-977-2024, https://doi.org/10.5194/tc-18-977-2024, 2024
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Here, we use satellite observations and an ice flow model to quantify the impact of sea ice buttressing on ice streams on the Antarctic Peninsula. The evacuation of 11-year-old landfast sea ice in the Larsen B embayment on the East Antarctic Peninsula in January 2022 was closely followed by major changes in the calving behaviour and acceleration (30 %) of the ocean-terminating glaciers. Our results show that sea ice buttressing had a negligible direct role in the observed dynamic changes.
James F. O'Neill, Tamsin L. Edwards, Daniel F. Martin, Courtney Shafer, Stephen L. Cornford, Helene L. Seroussi, Sophie Nowicki, and Mira Adhikari
EGUsphere, https://doi.org/10.5194/egusphere-2024-441, https://doi.org/10.5194/egusphere-2024-441, 2024
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We use an ice sheet model to simulate the Antarctic contribution to sea level over the 21st century, under a range of future climates, varying how sensitive the ice sheet is to different processes. We find that, under stronger warming scenarios, ocean temperatures increases and more snow falls on the ice sheet. When the ice sheet is sensitive to ocean warming, ocean melting driven loss exceeds snowfall driven gains, so that the sea level contribution is greater with more climate warming.
Andrew N. Hennig, David A. Mucciarone, Stanley S. Jacobs, Richard A. Mortlock, and Robert B. Dunbar
The Cryosphere, 18, 791–818, https://doi.org/10.5194/tc-18-791-2024, https://doi.org/10.5194/tc-18-791-2024, 2024
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A total of 937 seawater paired oxygen isotope (δ18O)–salinity samples collected during seven cruises on the SE Amundsen Sea between 1994 and 2020 reveal a deep freshwater source with δ18O − 29.4±1.0‰, consistent with the signature of local ice shelf melt. Local mean meteoric water content – comprised primarily of glacial meltwater – increased between 1994 and 2020 but exhibited greater interannual variability than increasing trend.
Qinggang Gao, Louise C. Sime, Alison J. McLaren, Thomas J. Bracegirdle, Emilie Capron, Rachael H. Rhodes, Hans Christian Steen-Larsen, Xiaoxu Shi, and Martin Werner
The Cryosphere, 18, 683–703, https://doi.org/10.5194/tc-18-683-2024, https://doi.org/10.5194/tc-18-683-2024, 2024
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Antarctic precipitation is a crucial component of the climate system. Its spatio-temporal variability impacts sea level changes and the interpretation of water isotope measurements in ice cores. To better understand its climatic drivers, we developed water tracers in an atmospheric model to identify moisture source conditions from which precipitation originates. We find that mid-latitude surface winds exert an important control on moisture availability for Antarctic precipitation.
Violaine Coulon, Ann Kristin Klose, Christoph Kittel, Tamsin Edwards, Fiona Turner, Ricarda Winkelmann, and Frank Pattyn
The Cryosphere, 18, 653–681, https://doi.org/10.5194/tc-18-653-2024, https://doi.org/10.5194/tc-18-653-2024, 2024
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We present new projections of the evolution of the Antarctic ice sheet until the end of the millennium, calibrated with observations. We show that the ocean will be the main trigger of future ice loss. As temperatures continue to rise, the atmosphere's role may shift from mitigating to amplifying Antarctic mass loss already by the end of the century. For high-emission scenarios, this may lead to substantial sea-level rise. Adopting sustainable practices would however reduce the rate of ice loss.
Francesca Baldacchino, Nicholas R. Golledge, Huw Horgan, Mathieu Morlighem, Alanna V. Alevropoulos-Borrill, Alena Malyarenko, Alexandra Gossart, Daniel P. Lowry, and Laurine van Haastrecht
EGUsphere, https://doi.org/10.5194/egusphere-2023-2793, https://doi.org/10.5194/egusphere-2023-2793, 2023
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Understanding how the Ross Ice Shelf flow is changing in a warming world is important for monitoring mass changes. The flow displays an intra-annual variation; however, it is unclear what mechanisms drive this variability. Sensitivity maps are modelled showing areas of the ice shelf where changes in basal melt most influence the ice flow. We suggest that basal melting partly drives the flow variability along the calving front of the ice shelf and will continue to do so in a warming world.
Hélène Seroussi, Vincent Verjans, Sophie Nowicki, Antony J. Payne, Heiko Goelzer, William H. Lipscomb, Ayako Abe-Ouchi, Cécile Agosta, Torsten Albrecht, Xylar Asay-Davis, Alice Barthel, Reinhard Calov, Richard Cullather, Christophe Dumas, Benjamin K. Galton-Fenzi, Rupert Gladstone, Nicholas R. Golledge, Jonathan M. Gregory, Ralf Greve, Tore Hattermann, Matthew J. Hoffman, Angelika Humbert, Philippe Huybrechts, Nicolas C. Jourdain, Thomas Kleiner, Eric Larour, Gunter R. Leguy, Daniel P. Lowry, Chistopher M. Little, Mathieu Morlighem, Frank Pattyn, Tyler Pelle, Stephen F. Price, Aurélien Quiquet, Ronja Reese, Nicole-Jeanne Schlegel, Andrew Shepherd, Erika Simon, Robin S. Smith, Fiammetta Straneo, Sainan Sun, Luke D. Trusel, Jonas Van Breedam, Peter Van Katwyk, Roderik S. W. van de Wal, Ricarda Winkelmann, Chen Zhao, Tong Zhang, and Thomas Zwinger
The Cryosphere, 17, 5197–5217, https://doi.org/10.5194/tc-17-5197-2023, https://doi.org/10.5194/tc-17-5197-2023, 2023
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Mass loss from Antarctica is a key contributor to sea level rise over the 21st century, and the associated uncertainty dominates sea level projections. We highlight here the Antarctic glaciers showing the largest changes and quantify the main sources of uncertainty in their future evolution using an ensemble of ice flow models. We show that on top of Pine Island and Thwaites glaciers, Totten and Moscow University glaciers show rapid changes and a strong sensitivity to warmer ocean conditions.
Joel A. Wilner, Mathieu Morlighem, and Gong Cheng
The Cryosphere, 17, 4889–4901, https://doi.org/10.5194/tc-17-4889-2023, https://doi.org/10.5194/tc-17-4889-2023, 2023
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We use numerical modeling to study iceberg calving off of ice shelves in Antarctica. We examine four widely used mathematical descriptions of calving (
calving laws), under the assumption that Antarctic ice shelf front positions should be in steady state under the current climate forcing. We quantify how well each of these calving laws replicates the observed front positions. Our results suggest that the eigencalving and von Mises laws are most suitable for Antarctic ice shelves.
Moritz Kreuzer, Torsten Albrecht, Lena Nicola, Ronja Reese, and Ricarda Winkelmann
EGUsphere, https://doi.org/10.5194/egusphere-2023-2737, https://doi.org/10.5194/egusphere-2023-2737, 2023
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The study investigates how changing sea levels around Antarctica can potentially affect the floating ice shelves. It utilizes numerical models for both the Antarctic Ice Sheet and the solid Earth, investigating features like troughs and sills that control the flow of ocean water onto the continental shelf. The research finds that variations in sea level alone can significantly impact the melting rates of ice shelves.
Rebecca J. Sanderson, Kate Winter, S. Louise Callard, Felipe Napoleoni, Neil Ross, Tom A. Jordan, and Robert G. Bingham
The Cryosphere, 17, 4853–4871, https://doi.org/10.5194/tc-17-4853-2023, https://doi.org/10.5194/tc-17-4853-2023, 2023
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Ice-penetrating radar allows us to explore the internal structure of glaciers and ice sheets to constrain past and present ice-flow conditions. In this paper, we examine englacial layers within the Lambert Glacier in East Antarctica using a quantitative layer tracing tool. Analysis reveals that the ice flow here has been relatively stable, but evidence for former fast flow along a tributary suggests that changes have occurred in the past and could change again in the future.
Thorsten Seehaus, Christian Sommer, Thomas Dethinne, and Philipp Malz
The Cryosphere, 17, 4629–4644, https://doi.org/10.5194/tc-17-4629-2023, https://doi.org/10.5194/tc-17-4629-2023, 2023
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Existing mass budget estimates for the northern Antarctic Peninsula (>70° S) are affected by considerable limitations. We carried out the first region-wide analysis of geodetic mass balances throughout this region (coverage of 96.4 %) for the period 2013–2017 based on repeat pass bi-static TanDEM-X acquisitions. A total mass budget of −24.1±2.8 Gt/a is revealed. Imbalanced high ice discharge, particularly at former ice shelf tributaries, is the main driver of overall ice loss.
Julius Garbe, Maria Zeitz, Uta Krebs-Kanzow, and Ricarda Winkelmann
The Cryosphere, 17, 4571–4599, https://doi.org/10.5194/tc-17-4571-2023, https://doi.org/10.5194/tc-17-4571-2023, 2023
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We adopt the novel surface module dEBM-simple in the Parallel Ice Sheet Model (PISM) to investigate the impact of atmospheric warming on Antarctic surface melt and long-term ice sheet dynamics. As an enhancement compared to traditional temperature-based melt schemes, the module accounts for changes in ice surface albedo and thus the melt–albedo feedback. Our results underscore the critical role of ice–atmosphere feedbacks in the future sea-level contribution of Antarctica on long timescales.
Gemma K. O'Connor, Paul R. Holland, Eric J. Steig, Pierre Dutrieux, and Gregory J. Hakim
The Cryosphere, 17, 4399–4420, https://doi.org/10.5194/tc-17-4399-2023, https://doi.org/10.5194/tc-17-4399-2023, 2023
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Glaciers in West Antarctica are rapidly melting, but the causes are unknown due to limited observations. A leading hypothesis is that an unusually large wind event in the 1940s initiated the ocean-driven melting. Using proxy reconstructions (e.g., using ice cores) and climate model simulations, we find that wind events similar to the 1940s event are relatively common on millennial timescales, implying that ocean variability or climate trends are also necessary to explain the start of ice loss.
Thomas Dethinne, Quentin Glaude, Ghislain Picard, Christoph Kittel, Patrick Alexander, Anne Orban, and Xavier Fettweis
The Cryosphere, 17, 4267–4288, https://doi.org/10.5194/tc-17-4267-2023, https://doi.org/10.5194/tc-17-4267-2023, 2023
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We investigate the sensitivity of the regional climate model
Modèle Atmosphérique Régional(MAR) to the assimilation of wet-snow occurrence estimated by remote sensing datasets. The assimilation is performed by nudging the MAR snowpack temperature. The data assimilation is performed over the Antarctic Peninsula for the 2019–2021 period. The results show an increase in the melt production (+66.7 %) and a decrease in surface mass balance (−4.5 %) of the model for the 2019–2020 melt season.
Nora Hirsch, Alexandra Zuhr, Thomas Münch, Maria Hörhold, Johannes Freitag, Remi Dallmayr, and Thomas Laepple
The Cryosphere, 17, 4207–4221, https://doi.org/10.5194/tc-17-4207-2023, https://doi.org/10.5194/tc-17-4207-2023, 2023
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Stable water isotopes from firn cores provide valuable information on past climates, yet their utility is hampered by stratigraphic noise, i.e. the irregular deposition and wind-driven redistribution of snow. We found stratigraphic noise on the Antarctic Plateau to be related to the local accumulation rate, snow surface roughness and slope inclination, which can guide future decisions on sampling locations and thus increase the resolution of climate reconstructions from low-accumulation areas.
Bryony I. D. Freer, Oliver J. Marsh, Anna E. Hogg, Helen Amanda Fricker, and Laurie Padman
The Cryosphere, 17, 4079–4101, https://doi.org/10.5194/tc-17-4079-2023, https://doi.org/10.5194/tc-17-4079-2023, 2023
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We develop a method using ICESat-2 data to measure how Antarctic grounding lines (GLs) migrate across the tide cycle. At an ice plain on the Ronne Ice Shelf we observe 15 km of tidal GL migration, the largest reported distance in Antarctica, dominating any signal of long-term migration. We identify four distinct migration modes, which provide both observational support for models of tidal ice flexure and GL migration and insights into ice shelf–ocean–subglacial interactions in grounding zones.
Rajashree Tri Datta, Adam Herrington, Jan T. M. Lenaerts, David P. Schneider, Luke Trusel, Ziqi Yin, and Devon Dunmire
The Cryosphere, 17, 3847–3866, https://doi.org/10.5194/tc-17-3847-2023, https://doi.org/10.5194/tc-17-3847-2023, 2023
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Precipitation over Antarctica is one of the greatest sources of uncertainty in sea level rise estimates. Earth system models (ESMs) are a valuable tool for these estimates but typically run at coarse spatial resolutions. Here, we present an evaluation of the variable-resolution CESM2 (VR-CESM2) for the first time with a grid designed for enhanced spatial resolution over Antarctica to achieve the high resolution of regional climate models while preserving the two-way interactions of ESMs.
Yaowen Zheng, Nicholas R. Golledge, Alexandra Gossart, Ghislain Picard, and Marion Leduc-Leballeur
The Cryosphere, 17, 3667–3694, https://doi.org/10.5194/tc-17-3667-2023, https://doi.org/10.5194/tc-17-3667-2023, 2023
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Positive degree-day (PDD) schemes are widely used in many Antarctic numerical ice sheet models. However, the PDD approach has not been systematically explored for its application in Antarctica. We have constructed a novel grid-cell-level spatially distributed PDD (dist-PDD) model and assessed its accuracy. We suggest that an appropriately parameterized dist-PDD model can be a valuable tool for exploring Antarctic surface melt beyond the satellite era.
Fernando S. Paolo, Alex S. Gardner, Chad A. Greene, Johan Nilsson, Michael P. Schodlok, Nicole-Jeanne Schlegel, and Helen A. Fricker
The Cryosphere, 17, 3409–3433, https://doi.org/10.5194/tc-17-3409-2023, https://doi.org/10.5194/tc-17-3409-2023, 2023
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We report on a slowdown in the rate of thinning and melting of West Antarctic ice shelves. We present a comprehensive assessment of the Antarctic ice shelves, where we analyze at a continental scale the changes in thickness, flow, and basal melt over the past 26 years. We also present a novel method to estimate ice shelf change from satellite altimetry and a time-dependent data set of ice shelf thickness and basal melt rates at an unprecedented resolution.
Cyrille Mosbeux, Laurie Padman, Emilie Klein, Peter D. Bromirski, and Helen A. Fricker
The Cryosphere, 17, 2585–2606, https://doi.org/10.5194/tc-17-2585-2023, https://doi.org/10.5194/tc-17-2585-2023, 2023
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Antarctica's ice shelves (the floating extension of the ice sheet) help regulate ice flow. As ice shelves thin or lose contact with the bedrock, the upstream ice tends to accelerate, resulting in increased mass loss. Here, we use an ice sheet model to simulate the effect of seasonal sea surface height variations and see if we can reproduce observed seasonal variability of ice velocity on the ice shelf. When correctly parameterised, the model fits the observations well.
Lena Nicola, Dirk Notz, and Ricarda Winkelmann
The Cryosphere, 17, 2563–2583, https://doi.org/10.5194/tc-17-2563-2023, https://doi.org/10.5194/tc-17-2563-2023, 2023
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For future sea-level projections, approximating Antarctic precipitation increases through temperature-scaling approaches will remain important, as coupled ice-sheet simulations with regional climate models remain computationally expensive, especially on multi-centennial timescales. We here revisit the relationship between Antarctic temperature and precipitation using different scaling approaches, identifying and explaining regional differences.
Anna Ruth W. Halberstadt, Greg Balco, Hannah Buchband, and Perry Spector
The Cryosphere, 17, 1623–1643, https://doi.org/10.5194/tc-17-1623-2023, https://doi.org/10.5194/tc-17-1623-2023, 2023
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This paper explores the use of multimillion-year exposure ages from Antarctic bedrock outcrops to benchmark ice sheet model predictions and thereby infer ice sheet sensitivity to warm climates. We describe a new approach for model–data comparison, highlight an example where observational data are used to distinguish end-member models, and provide guidance for targeted sampling around Antarctica that can improve understanding of ice sheet response to climate warming in the past and future.
Mira Berdahl, Gunter Leguy, William H. Lipscomb, Nathan M. Urban, and Matthew J. Hoffman
The Cryosphere, 17, 1513–1543, https://doi.org/10.5194/tc-17-1513-2023, https://doi.org/10.5194/tc-17-1513-2023, 2023
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Contributions to future sea level from the Antarctic Ice Sheet remain poorly constrained. One reason is that ice sheet model initialization methods can have significant impacts on how the ice sheet responds to future forcings. We investigate the impacts of two key parameters used during model initialization. We find that these parameter choices alone can impact multi-century sea level rise by up to 2 m, emphasizing the need to carefully consider these choices for sea level rise predictions.
Julien A. Bodart, Robert G. Bingham, Duncan A. Young, Joseph A. MacGregor, David W. Ashmore, Enrica Quartini, Andrew S. Hein, David G. Vaughan, and Donald D. Blankenship
The Cryosphere, 17, 1497–1512, https://doi.org/10.5194/tc-17-1497-2023, https://doi.org/10.5194/tc-17-1497-2023, 2023
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Estimating how West Antarctica will change in response to future climatic change depends on our understanding of past ice processes. Here, we use a reflector widely visible on airborne radar data across West Antarctica to estimate accumulation rates over the past 4700 years. By comparing our estimates with current atmospheric data, we find that accumulation rates were 18 % greater than modern rates. This has implications for our understanding of past ice processes in the region.
Na Li, Ruibo Lei, Petra Heil, Bin Cheng, Minghu Ding, Zhongxiang Tian, and Bingrui Li
The Cryosphere, 17, 917–937, https://doi.org/10.5194/tc-17-917-2023, https://doi.org/10.5194/tc-17-917-2023, 2023
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The observed annual maximum landfast ice (LFI) thickness off Zhongshan (Davis) was 1.59±0.17 m (1.64±0.08 m). Larger interannual and local spatial variabilities for the seasonality of LFI were identified at Zhongshan, with the dominant influencing factors of air temperature anomaly, snow atop, local topography and wind regime, and oceanic heat flux. The variability of LFI properties across the study domain prevailed at interannual timescales, over any trend during the recent decades.
Giacomo Traversa, Davide Fugazza, and Massimo Frezzotti
The Cryosphere, 17, 427–444, https://doi.org/10.5194/tc-17-427-2023, https://doi.org/10.5194/tc-17-427-2023, 2023
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Megadunes are fields of huge snow dunes present in Antarctica and on other planets, important as they present mass loss on the leeward side (glazed snow), on a continent characterized by mass gain. Here, we studied megadunes using remote data and measurements acquired during past field expeditions. We quantified their physical properties and migration and demonstrated that they migrate against slope and wind. We further proposed automatic detections of the glazed snow on their leeward side.
Bertie W. J. Miles, Chris R. Stokes, Adrian Jenkins, Jim R. Jordan, Stewart S. R. Jamieson, and G. Hilmar Gudmundsson
The Cryosphere, 17, 445–456, https://doi.org/10.5194/tc-17-445-2023, https://doi.org/10.5194/tc-17-445-2023, 2023
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Satellite observations have shown that the Shirase Glacier catchment in East Antarctica has been gaining mass over the past 2 decades, a trend largely attributed to increased snowfall. Our multi-decadal observations of Shirase Glacier show that ocean forcing has also contributed to some of this recent mass gain. This has been caused by strengthening easterly winds reducing the inflow of warm water underneath the Shirase ice tongue, causing the glacier to slow down and thicken.
Cited articles
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.
Alley, R. B., Blankenship, D. D., Rooney, S. T., and Bentley, C. R.:
Sedimentation beneath ice shelves – the view from ice stream B, Mar. Geol., 85, 101–120, 1989.
Arndt, J. E., Larter, R. D., Friedl, P., Gohl, K., Höppner, K., and the Science Team of Expedition PS104: Bathymetric controls on calving processes at Pine Island Glacier, The Cryosphere, 12, 2039–2050, https://doi.org/10.5194/tc-12-2039-2018, 2018.
Arndt, J. E., Schenke, H. W., Jakobsson, M., Nitsche, F. O., Buys, G.,
Goleby, B., Rebesco, M., Bohoyo, F., Hong, J., Black, J., Greku, R.,
Udintsev, G., Barrios, F., Reynoso-Peralta, W., Taisei, M., and Wigley, R.:
The International Bathymetric Chart of the Southern Ocean (IBCSO) Version
1.0 – A new bathymetric compilation covering circum-Antarctic waters,
Geophys. Res. Lett., 40, 3111–3117, https://doi.org/10.1002/grl.50413, 2013.
Arthern, R. J., Hindmarsh, R. C. A., and Williams, C. R.: Flow speed within
the Antarctic ice sheet and its controls inferred from satellite
observations, J. Geophys. Res.-Earth, 120,
1171–1188, 2015.
Bellwald, B., Hjelstuen, B. O., Sejrup, H. P., Stokowy, T., and Kuvås,
J.: Holocene mass movements in west and mid-Norwegian fjords and lakes,
Mar. Geol., 407, 192–212, 2019.
Benn, D. I. and Evans, D. J. A.: Glaciers and Glaciation, 2nd Edn., Hodder,
Education, London, 802 pp., ISBN 978-0-340-905791, 2010.
Berger, S., Favier, L., Drews, R., Derwael, J.-J., and Pattyn, F.: The
control of an uncharted pinning point on the flow of an Antarctic ice shelf, J. Glaciol., 62, 37–45, 2016.
Bingham, R. G., Vaughan, D. G., King, E. C., Davies, D., Cornford, S. L.,
Smith, A. M., Arthern, R. J., Brisbourne, A. M., De Rydt, J., Graham, A. G.
C., Spagnolo, M., Marsh, O. J., and Shean, D. E.: Diverse landscapes beneath
Pine Island Glacier influence ice flow, Nat. Commun., 8, 1618,
2017.
Caress, D. W. and Chayes, D. N.: Improved processing of Hydrosweep DS
multibeam data on the R/V Maurice Ewing, Mar. Geophys. Res., 18,
631–650, 1996.
Caress, D. W., Chayes, D. N., and Ferreira, C.: MB-System Seafloor Mapping Software, available at:
https://www.mbari.org/products/research-software/mb-system/, last access:
12 February 2020.
Clark, C. D., Tulaczyk, S. M., Stokes, C. R., and Canals, M.: A
groove-ploughing theory for the production of mega-scale glacial lineations,
and implications for ice-stream mechanics, J. Glaciol., 49,
240–256, 2003.
Davies, D., Bingham, R. G., Graham, A. G. C., Spagnolo, M., Dutrieux, P.,
Vaughan, D. G., Jenkins, A., and Nitsche, F. O.: High-resolution
sub-ice-shelf seafloor records of twentieth century ungrounding and retreat
of Pine Island Glacier, West Antarctica, J. Geophys. Res.-Earth, 122, 1698–1714, 2017.
De Rydt, J. and Gudmundsson, G. H.: Coupled ice shelf-ocean modeling and
complex grounding line retreat from a seabed ridge, J. Geophys. Res.-Earth, 121, 865–880, 2016.
De Rydt, J., Holland, P. R., Dutrieux, P., and Jenkins, A.: Geometric and
oceanographic controls on melting beneath Pine Island Glacier, J. Geophys. Res.-Oceans, 119, 2420–2438, 2014.
Dowdeswell, J. A., Batchelor, C. L., Montelli, A., Ottesen, D., Christie, F.
D. W., Dowdeswell, E. K., and Evans, J.: Delicate seafloor landforms reveal
past Antarctic grounding-line retreat of kilometers per year, Science, 368,
1020, 2020.
Dowdeswell, E. K., Todd, B. J., and Dowdeswell, J. A.: Crag-and-tail
features: convergent ice flow through Eclipse Sound, Baffin Island, Arctic
Canada, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., and Hogan, K. A., Geological Society, London, Memoirs, 46, 55–56, https://doi.org/10.1144/M46.106, 2016.
Dowdeswell, J. A. and Fugelli, E. M. G.: The seismic architecture and
geometry of grounding-zone wedges formed at the marine margins of past ice
sheets, Geol. Soc. Am. Bull., 124, 1750–1761, 2012.
Dutrieux, P., De Rydt, J., Jenkins, A., Holland, P. R., Ha, H. K., Lee, S. H., Steig, E. J., Ding, Q., Abrahamsen, E. P., and Schröder, M.: Strong Sensitivity of Pine Island Ice-Shelf Melting to Climatic Variability, Science, 343, 174–178, https://doi.org/10.1126/science.1244341, 2014.
Evans, J., Dowdeswell, J. A., Ó Cofaigh, C., Benham, T. J., and
Anderson, J. B.: Extent and dynamics of the West Antarctic Ice Sheet on the
outer continental shelf of Pine Island Bay during the last glaciation,
Mar. Geol., 230, 53–72, 2006.
Falcini, F. M., Rippin, D. M., Krabbendam, M., and Selby, K. A.: Quantifying
bed roughness beneath contemporary and palaeo-ice streams, J. Glaciol., 64, 822–834, 2018.
Favier, L., Durand, G., Cornford, S. L., Gudmundsson, G. H., Gagliardini,
O., Gillet-Chaulet, F., Zwinger, T., Payne, A. J., and Le Brocq, A. M.:
Retreat of Pine Island Glacier controlled by marine ice-sheet instability,
Nat. Clim. Change, 4, 117–121, 2014.
Favier, L., Pattyn, F., Berger, S., and Drews, R.: Dynamic influence of pinning points on marine ice-sheet stability: a numerical study in Dronning Maud Land, East Antarctica, The Cryosphere, 10, 2623–2635, https://doi.org/10.5194/tc-10-2623-2016, 2016.
Ferrigno, J. G., Lucchitta, B. K., Mullins, K. F., Allison, A. L., Allen, R.
J., and Gould, W. G.: Velocity measurements and changes in position of
Thwaites Glacier/iceberg tongue from aerial photography, Landsat images and
NOAA AVHRR data, Ann. Glaciol., 17, 239–244, 1993.
Fowler, A. C. and Nye, J. F.: A sliding law for glaciers of constant
viscosity in the presence of subglacial cavitation, P. R. Soc.-Math. Phys. Sc., 407, 147–170,
1986.
Gales, J. A., Larter, R. D., Mitchell, N. C., and Dowdeswell, J. A.:
Geomorphic signature of Antarctic submarine gullies: Implications for
continental slope processes, Mar. Geol., 337, 112–124, 2013.
Glen, J. W. and Perutz, M. F.: The creep of polycrystalline ice, P. R. Soc.-Math. Phys. Sc., 228, 519–538, 1955.
Gohl, K.: Basement control on past ice sheet dynamics in the Amundsen Sea
Embayment, West Antarctica, Palaeogeogr. Palaeocl., 335–336, 35–41, 2012.
Gohl, K., Denk, A., Eagles, G., and Wobbe, F.: Deciphering tectonic phases
of the Amundsen Sea Embayment shelf, West Antarctica, from a magnetic
anomaly grid, Tectonophysics, 585, 113–123, 2013.
Graham, A. G. C. and Hogan, K. A.: Crescentic scours on palaeo-ice stream
beds, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., and Hogan, K. A., Memoirs, Geological Society, London, 46, 221–222, https://doi.org/10.1144/M46.166, 2016.
Graham, A. G. C., Larter, R. D., Gohl, K., Hillenbrand, C.-D., Smith, J. A.,
and Kuhn, G.: Bedform signature of a West Antarctic palaeo-ice stream
reveals a multi-temporal record of flow and substrate control, Quaternary Sci. Rev., 28, 2774–2793, 2009.
Graham, A. G. C., Larter, R. D., Gohl, K., Dowdeswell, J. A., Hillenbrand, C.-D., Smith, J. A., Evans, J., Kuhn, G., and
Deen, T.: Flow and retreat of the Late Quaternary Pine Island‐Thwaites palaeo‐ice stream, West Antarctica, J. Geophys.
Res., 115, F03025, https://doi.org/10.1029/2009JF001482, 2010.
Greenwood, S. L., Simkins, L. M., Halberstadt, A. R. W., Prothro, L. O., and
Anderson, J. B.: Holocene reconfiguration and readvance of the East
Antarctic Ice Sheet, Nat. Commun., 9, 3176, 2018.
Ha, H. K., Wåhlin, A. K., Kim, T. W., Lee, S. H., Lee, J. H., Lee, H.
J., Hong, C. S., Arneborg, L., Björk, G., and Kalén, O.: Circulation
and Modification of Warm Deep Water on the Central Amundsen Shelf, J. Phys. Oceanogr., 44, 1493–1501, 2014.
Heywood, K. J., Biddle, L. C., Boehme, L., Dutrieux, P., Fedak, M., Jenkins,
A., Jones, R. W., Kaiser, J., Mallett, H., Garabato, A. C. N., Renfrew, I.
A., Stevens, D. P., and Webber, B. G. M.: Between the Devil and the Deep Blue Sea: The Role of the Amundsen Sea Continental Shelf in Exchanges Between Ocean and Ice Shelves, Oceanography, 29, 118–129, 2016.
Hillenbrand, C.-D., Kuhn, G., Smith, J. A., Gohl, K., Graham, A. G. C.,
Larter, R. D., Klages, J. P., Downey, R., Moreton, S. G., Forwick, M., and
Vaughan, D. G.: Grounding-line retreat of the West Antarctic Ice Sheet from
inner Pine Island Bay, Geology, 41, 35–38, 2013.
Hogan, K. A., Dowdeswell, J. A., and Mienert, J.: New insights into slide
processes and seafloor geology revealed by side-scan imagery of the massive
Hinlopen Slide, Arctic Ocean margin, Geo-Mar. Lett., 33, 325–343, 2013.
Hogan, K. A., Larter, R. D., Graham, A. G. C., Nitsche, F. O., Kirkham, J. D., Totten Minzoni, R., Clark, R., Fitzgerald, V., Anderson, J. B., Hillenbrand, C.-D., Simkins, L., Smith, J. A., Gohl, K., Arndt, J. E., Hong, J., Heywood, K. J., Abrahamsen, E. P., Thompson, A. F., Dunbar, R., and Wellner, J. S.: A multibeam-bathymetric compilation for the southern Amundsen Sea shelf, 1999–2019 (Version 1.0) [Data set], UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation, https://doi.org/10.5285/F2DFEDA9-BF44-4EF5-89A3-EE5E434A385C, 2020.
Holschuh, N., Christianson, K., Paden, J., Alley, R. B., and Anandakrishnan,
S.: Linking postglacial landscapes to glacier dynamics using swath radar
imaging at Thwaites Glacier, Antarctica, Geology, 48, 268–272, 2020.
Holt, J. W., Blankenship, D. D., Morse, D. L., Young, D. A., Peters, M. E.,
Kempf, S. D., Richter, T. G., Vaughan, D. G., and Corr, H. F. J.: New
boundary conditions for the West Antarctic Ice Sheet: Subglacial topography
of the Thwaites and Smith glacier catchments, Geophys. Res. Lett.,
33, L09502, https://doi.org/10.1029/2005GL025561, 2006.
Hubbard, B., Siegert, M. J., and McCarroll, D.: Spectral roughness of
glaciated bedrock geomorphic surfaces: Implications for glacier sliding,
J. Geophys. Res.-Sol. Ea., 105, 21295–21303, 2000.
Hughes, T. J.: The weak underbelly of the West Antarctic ice sheet, J. Glaciol., 27, 518–525, 1981.
Jacobs, S., Giulivi, C., Dutrieux, P., Rignot, E., Nitsche, F., and
Mouginot, J.: Getz Ice Shelf melting response to changes in ocean forcing,
J. Geophys. Res.-Oceans, 118, 4152–4168, 2013.
Jacobs, S., Jenkins, A., Hellmer, H., Giulivi, C., Nitsche, F., Huber, B.,
and Guerrero, R.: The Amundsen Sea and the Antarctic Ice Sheet,
Oceanography, 25, 154–163, 2012.
Jacobs, S. S., Hellmer, H. H., and Jenkins, A.: Antarctic Ice Sheet melting
in the southeast Pacific, Geophys. Res. Lett., 23, 957–960, 1996.
Jakobsson, M., Anderson, J. B., Nitsche, F. O., Gyllencreutz, R., Kirshner,
A. E., Kirchner, N., O'Regan, M., Mohammad, 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, 2012.
Jakobsson, M., Nilsson, J., O'Regan, M., Backman, J., Löwemark, L.,
Dowdeswell, J. A., Mayer, L., Polyak, L., Colleoni, F., Anderson, L.,
Björk, G., Darby, D., Eriksson, B., Hanslik, D., Hell, B., Marcussen,
C., Sellén, E., and Wallin, Å.: An Arctic Ocean ice shelf during MIS
6 constrained by new geophysical and geological data, Quaternary Sci. Rev., 29, 3505–3517, 2010.
Jenkins, A., Dutrieux, P., Jacobs, S. S., McPhail, S. D., Perrett, J. R.,
Webb, A. T., and White, D.: Observations beneath Pine Island Glacier in
West Antarctica and implications for its retreat, Nat. Geosci., 3,
468–472, 2010.
Jenkins, A., Dutrieux, P., Jacobs, S., Steig, E. J., Gudmundsson, G. H.,
Smith, J., and Heywood, K. J.: Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea, Oceanography, 29, 106–117, 2016.
Jezek, K., Wu, X., Gogineni, P., Rodríguez, E., Freeman, A.,
Rodriguez-Morales, F., and Clark, C. D.: Radar images of the bed of the
Greenland Ice Sheet, Geophys. Res. Lett., 38, 1–5, https://doi.org/10.1029/2010GL045519, 2011.
Johnson, J. S., Smith, J. A., Schaefer, J.
M., Young, N. E., Goehring, B. M., Hillenbrand, C.-D., Lamp, J. L., Finkel,
R. C., and Gohl, K.: The last glaciation of Bear Peninsula, central Amundsen
Sea Embayment of Antarctica: Constraints on timing and duration revealed by
in situ cosmogenic 14C and 10Be dating, Quaternary Sci. Rev., 178,
77–88, 2017.
Jordan, T. A., Porter, D., Tinto, K., Millan, R., Muto, A., Hogan, K., Larter, R. D.,
Graham, A. G. C., and Pade, J. D.:
New gravity-derived bathymetry for the Thwaites, Crosson, and
Dotson ice shelves revealing two ice shelf populations,
The Cryosphere, 14, 2869–2882, https://doi.org/10.5194/tc-14-2869-2020, 2020.
Jordan, T. M., Cooper, M. A., Schroeder, D. M., Williams, C. N., Paden, J. D., Siegert, M. J., and Bamber, J. L.: Self-affine subglacial roughness: consequences for radar scattering and basal water discrimination in northern Greenland, The Cryosphere, 11, 1247–1264, https://doi.org/10.5194/tc-11-1247-2017, 2017.
Joughin, I., Tulaczyk, S., Bamber, J. L., Blankenship, D., Holt, J. W., Scambos, T., and Vaughan, D. G.: Basal conditions for Pine Island and Thwaites Glaciers, West Antarctica, determined using satellite and airborne data, J. Glaciol., 55, 245–257, 2009.
Joughin, I., Smith, B. E., and Holland, D. M.: Sensitivity of 21st century
sea level to ocean-induced thinning of Pine Island Glacier, Antarctica,
Geophys. Res. Lett., 37, L20502, https://doi.org/10.1029/2010GL044819, 2010.
Joughin, I., Smith, B. E., and Medley, B.: Marine Ice Sheet Collapse
Potentially Under Way for the Thwaites Glacier Basin, West Antarctica,
Science, 344, 735, 2014.
Kamb, B.: Sliding motion of glaciers: theory and observation, Reviews of
Geophysics and Space Physics, 8, 673–728, 1970.
Kim, J.-W., Kim, D.-j., Kim, S. H., Ha, H. K., and Lee, S. H.:
Disintegration and acceleration of Thwaites Ice Shelf on the Amundsen Sea
revealed from remote sensing measurements, Gisci. Remote Sens.,
52, 498–509, 2015.
King, E. C., Pritchard, H. D., and Smith, A. M.: Subglacial landforms
beneath Rutford Ice Stream, Antarctica: detailed bed topography from
ice-penetrating radar, Earth Syst. Sci. Data, 8, 151–158, 2016.
Kirkham, J. D., Hogan, K. A., Larter, R. D., Arnold, N. S., Nitsche, F. O., Golledge, N. R., and Dowdeswell, J. A.: Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica, The Cryosphere, 13, 1959–1981, https://doi.org/10.5194/tc-13-1959-2019, 2019.
Kirshner, A., Anderson, J.B., Jakobsson, M., O'Regan, M., Majewski, W., and
Nitsche, F.: Post-LGM deglaciation in Pine island Bay, west Antarctica.
Quaternary Sci. Rev., 38, 11–26, 2012.
Kuhn, G., Hillenbrand, C.-D., Kasten, S., Smith, J. A., Nitsche, F. O.,
Frederichs, T., Wiers, S., Ehrmann, W., Klages, J. P., and Mogollón, J.
M.: Evidence for a palaeo-subglacial lake on the Antarctic continental
shelf, Nat. Commun., 8, 15591, https://doi.org/10.1038/ncomms15591, 2017.
Larter, R. D., Gohl, K., Hillenbrand, C.-D., Kuhn, G., Deen, T. J., Dietrich, R., Eagles, G., Johnson, J. S., Livermore, R. A., Nitsche, F. O., Pudsey, C. J., Schenke, H.-W., Smith, J. A., Udintsev, G., and Uenzelmann-Neben, G.: West Antarctic Ice Sheet change since the Last Glacial Period, Eos T. Am. Geophys. Un., 88, 189–190, 2007.
Larter, R. D., Graham, A. G. C., Gohl, K., Kuhn, G., Hillenbrand, C.-D.,
Smith, J. A., Deen, T. J., Livermore, R. A., and Schenke, H.-W.: Subglacial
bedforms reveal complex basal regime in a zone of paleo–ice stream
convergence, Amundsen Sea embayment, West Antarctica, Geology, 37, 411–414,
2009.
Larter, R. D., Anderson, J. B., Graham, A. G. C., Gohl, K., Hillenbrand, C-.
D., Jakobsson, M., Johnson, J. S., Kuhn, G., Nitsche, F. O., Smith, J. A.,
Witus, A. E., Bentley, M. J., Dowdeswell, J. A., Ehrmann, W., Klages, J. P.,
Lindow, J., O Cofaigh, C., and Spiegel, C.: Reconstruction of changes in the
Amundsen Sea ad Bellingshausen Sea sector of the West Antarctic Ice Sheet
since the Last Glacial Maximum, Quaternary Sci. Rev., 100, 55–86,
2014.
Larter, R. D., Queste, B. Y., Boehme, L., Braddock, S., Wåhlin, A. K.,
Graham, A. G. C., Hogan, K. A., Totten Minzoni, R., Barham, M., Bortolotto
de'Oliveira, G., Clark, R., Fitzgerald, V., Karam, S., Kirkham, J. D.,
Mazur, A., Sheehan, P., Spoth, M., Stedt, P., Welzenbach, L. Zheng, Y.,
Andersson, J., Rolandsson, J., Beeler, C., Goodell, J., Rush, and Snow, T.:
CRUISE REPORT RV/IB Nathaniel B. Palmer Cruise NBP19-02, January-March 2019: First research cruise of the International Thwaites
Glacier Collaboration,
http://get.rvdata.us/cruise/NBP1902/doc/NBP1902_report_final.pdf (last access: 11 June 2020), 2020.
Larter, R. D. and Vanneste, L. E.: Relict subglacial deltas on the Antarctic
Peninsula outer shelf, Geology, 23, 33–36, 1995.
Livingstone, S. J., Cofaigh, C. Ó., Stokes, C. R., Hillenbrand, C.-D.,
Vieli, A., and Jamieson, S. S. R.: Glacial geomorphology of Marguerite Bay
Palaeo-Ice stream, western Antarctic Peninsula, J. Maps, 9, 558–572,
2013.
Liu, E. W., Räss, L., Suckale, J., Herman, F., and Podladchikov, Y.:
Spontaneous Formation of Internal Shear Zone in Ice Flowing over a
Topographically Variable Bed, EGU General Assembly 2020, Online, 4–8 May
2020, EGU2020-12602,
https://doi.org/10.5194/egusphere-egu2020-12602, 2020.
Lowe, A. L. and Anderson, J. B.: Evidence for abundant subglacial meltwater
beneath the paleo-ice sheet in Pine Island Bay, Antarctica, J. Glaciol., 49, 125–138, 2003.
Lowe, A. L. and Anderson, J. B.: Reconstruction of the West Antarctic ice
sheet in Pine Island Bay during the Last Glacial Maximum and its subsequent
retreat history, Quaternary Sci. Rev., 21, 1879–1897, 2002.
MacAyeal, D. R.: Large-scale ice flow over a viscous basal sediment: Theory
and application to ice stream B, Antarctica, J. Geophys. Res.-Sol. Ea., 94, 4071–4087, 1989.
MacGregor, J. A., Catania, G. A., Markowski, M. S., and Andrews, A. G.:
Widespread rifting and retreat of ice-shelf margins in the eastern Amundsen
Sea Embayment between 1972 and 2011, J. Glaciol., 58, 458–466,
2012.
MacLean, B., Blasco, S., Bennett, R., Hughes Clarke, J. E., and Patton, E.:
Crag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., and Hogan, K. A., Memoirs, Geological Society, London, 46, 53–54, https://doi.org/10.1144/M46.84, 2016.
Matsuoka, K., Hindmarsh, R. C. A., Moholdt, G., Bentley, M. J., Pritchard,
H. D., Brown, J., Conway, H., Drews, R., Durand., G., Goldberg, D.,
Hattermann, T., Kingslake, J., Lenaerts, J. T. M., Martín, C.,
Mulvaney, R., Nicholss, K. W., Pattyn, F., Ross, N., Scambos, T., and
Whitehouse, P. L.: Antarctic ice rises and rumples: Their properties and
significance for ice-sheet dynamics and evolution, Earth Sci. Rev.,
150, 724–745, 2015.
Mayer, L. A., Paton, M., Gee, L., Gardner, S. V., and Ware, C.: Interactive
3-D visualization: a tool for seafloor navigation, exploration and
engineering, in: Proceedings of the OCEANS 2000 MTS/IEEE Conference and Exhibition, Providence, USA, 11–14 September 200, 913–919, 2000.
McMillan, M., Shepherd, A., Sundal, A., Briggs, K., Muir, A., Ridout, A.,
Hogg, A., and Wingham, D.: Increased ice losses from Antarctica detected by
CryoSat-2, Geophys. Res. Lett., 41, 3899–3905, 2014.
Milillo, P., Rignot, E., Rizzoli, P., Scheuchl, B., Mouginot, J.,
Bueso-Bello, J., and Prats-Iraola, P.: Heterogeneous retreat and ice melt of
Thwaites Glacier, West Antarctica, Science Advances, 5, eaau3433, https://doi.org/10.1126/sciadv.aau3433, 2019.
Millan, R., Rignot, E., Bernier, V., Morlighem, M., and Dutrieux, P.:
Bathymetry of the Amundsen Sea Embayment sector of West Antarctica from
Operation IceBridge gravity and other data, Geophys. Res. Lett.,
44, 1360–1368, 2017.
Morlighem, M., Rignot, E., Binder, T., Blankenship, D., Drews, R., Eagles,
G., Eisen, O., Ferraccioli, F., Forsberg, R., Fretwell, P., Goel, V.,
Greenbaum, J. S., Gudmundsson, H., Guo, J., Helm, V., Hofstede, C., Howat,
I., Humbert, A., Jokat, W., Karlsson, N. B., Lee, W. S., Matsuoka, K.,
Millan, R., Mouginot, J., Paden, J., Pattyn, F., Roberts, J., Rosier, S.,
Ruppel, A., Seroussi, H., Smith, E. C., Steinhage, D., Sun, B., Broeke, M.
R. v. d., Ommen, T. D. v., Wessem, M. v., and Young, D. A.: Deep glacial
troughs and stabilizing ridges unveiled beneath the margins of the Antarctic
ice sheet, Nat. Geosci., 13, 132–137, https://doi.org/10.1038/s41561-019-0510-8, 2019.
Mouginot, J., Rignot, E., and Scheuchl, B.: Continent-Wide, Interferometric
SAR Phase, Mapping of Antarctic Ice Velocity, Geophys. Res. Lett.,
46, 9710–9718, 2019.
Mouginot, J., Rignot, E., and Scheuchl, B.: Sustained increase in ice
discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to
2013, Geophys. Res. Lett., 41, 1576–1584, 2014.
Muto, A., Alley, R. B., Parizek, B. R., and Anandakrishnan, S.: Bed-type
variability and till (dis)continuity beneath Thwaites Glacier, West
Antarctica, Ann. Glaciol., 60, 82–90, https://doi.org/10.1017/aog.2019.32, 2019a.
Muto, A., Anandakrishnan, S., Alley, R. B., Horgan, H. J., Parizek, B. R.,
Koellner, S., Christianson, K., and Holschuh, N.: Relating bed character and
subglacial morphology using seismic data from Thwaites Glacier, West
Antarctica, Earth Planet Sc. Lett., 507, 199–206, 2019b.
Nakayama, Y., Manucharyan, G., Zhang, H., Dutrieux, P., Torres, H. S.,
Klein, P., Seroussi, H., Schodlok, M., Rignot, E., and Menemenlis, D.:
Pathways of ocean heat towards Pine Island and Thwaites grounding lines,
Sci. Rep., 9, 16649, https://doi.org/10.1038/s41598-019-53190-6, 2019.
Nakayama, Y., Schröder, M., and Hellmer, H. H.: From circumpolar deep
water to the glacial meltwater plume on the eastern Amundsen Shelf, Deep-Sea
Res. Pt. I, 77, 50–62, 2013.
Nitsche, F. O., Gohl, K., Larter, R. D., Hillenbrand, C.-D., Kuhn, G., Smith, J. A., Jacobs, S., Anderson, J. B., and Jakobsson, M.: Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica, The Cryosphere, 7, 249–262, https://doi.org/10.5194/tc-7-249-2013, 2013.
Nitsche, F. O., Jacobs, S. S., Larter, R. D., and Gohl, K.: Bathymetry of
the Amundsen Sea continental shelf: Implications for geology, oceanography,
and glaciology, Geochem. Geophy. Geosy., 8, Q10009, https://doi.org/10.1029/2007GC001694, 2007.
Nitsche, F. O., Larter, R. D., Gohl, K., Graham, A. G. C., and Kuhn, G.:
Crag-and-tail features on the Amundsen Sea continental shelf, West
Antarctica, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., and Hogan, K. A., Memoirs, Geological Society, London, 46, 199–200, https://doi.org/10.1144/M46.2, 2016.
Noormets, R., Dowdeswell, J. A., Larter, R. D., Ó Cofaigh, C., and
Evans, J.: Morphology of the upper continental slope in the Bellingshausen
and Amundsen Seas - Implications for sedimentary processes at the shelf edge
of West Antarctica, Mar. Geol., 258, 100–114, 2009.
Noormets, R., Kirchner, N., Flink, A. E., and Dowdeswell, J. A.: Possible
iceberg-produced submarine terraces in Hambergbukta, Spitsbergen, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., and Hogan, K. A., Memoirs, Geolhttps://doi.org/10.1144/M46.121, 2016.
Nye, J. F.: Glacier sliding without cavitation in a linear viscous
approximation, P. Roy. Soc. A-Math. Phy., 315, 381–403,
1970.
Ó Cofaigh, C., Dowdeswell, J. A., Allen, C. S., Hiemstra, J. F., Pudsy,
C., J., Evans, J., Evans, D. J. A.: Flow dynamics and till genesis
associated with a marine-based Antarctic palaeo-ice stream, Quaternary Sci. Rev., 24, 709–740, 2005.
Paden, J., Akins, T., Dunson, D., Allen, C., and Gogineni, P.: Ice-sheet bed
3-D tomography, J. Glaciol., 56, 3–11, https://doi.org/10.3189/002214310791190811, 2010.
Parizek, B. R. and Walker, R. T.: Implications of initial conditions and
ice–ocean coupling for grounding-line evolution, Earth Planet Sc. Lett., 300, 351–358, 2010.
Pattyn, F. and Van Huele, W.: Power law or power flaw?, Earth Surface
Processes and Landforms, 23, 761–767, 1998.
Post, A. L., O'Brien, P. E., Edwards, S., Carroll, A. G., Malakoff, K., and
Armand, L. K.: Upper slope processes and seafloor ecosystems on the Sabrina
continental slope, East Antarctica, Mar. Geol., 422, 106091,
https://doi.org/10.1016/j.margeo.2019.106091, 2020.
Rabus, B. T., Lang, O., and Adolphs, U.: Interannual velocity variations and
recent calving of Thwaites Glacier Tongue, West Antarctica, Ann. Glaciol., 36, 215–224, 2003.
Rignot, E.: Evidence for rapid retreat and mass loss of Thwaites Glacier,
West Antarctica, J. Glaciol., 47, 213–222, 2001.
Rignot, E., Jacobs, S., Mouginot, J., and Scheuchl, B.: Ice-Shelf Melting
Around Antarctica, Science, 341, 266–270, 2013.
Rignot, E., Mouginot, J., Morlighem, M., Seroussi, H., and Scheuchl, B.:
Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith,
and Kohler glaciers, West Antarctica, from 1992 to 2011, Geophys. Res. Lett., 41, 3502–3509, 2014.
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., Mouginot, J., Scheuchl, B., van den Broeke, M., van Wessem, M.
J., and Morlighem, M.: Four decades of Antarctic Ice Sheet mass balance from
1979–2017, P. Natl. Acad. Sci. USA, 116, 1095,
2019.
Rippin, D. M., Vaughan, D. G., and Corr, H. F. J.: The basal roughness of
Pine Island Glacier, West Antarctica, J. Glaciol., 57, 67–76,
2011.
Scambos, T. A., Bell, R. E., Alley, R. B., Anandakrishnan, S., Bromwich, D.
H., Brunt, K., Christianson, K., Creyts, T., Das, S. B., DeConto, R.,
Dutrieux, P., Fricker, H. A., Holland, D., MacGregor, J., Medley, B.,
Nicolas, J. P., Pollard, D., Siegfried, M. R., Smith, A. M., Steig, E. J.,
Trusel, L. D., Vaughan, D. G., and Yager, P. L.: How much, how fast?: A
science review and outlook for research on the instability of Antarctica's
Thwaites Glacier in the 21st century, Global Planet. Change, 153,
16–34, 2017.
Schoof, C.: Basal perturbations under ice streams: form drag and surface
expression, J. Glaciol., 48, 407–416, 2002.
Schoof, C.: The effect of cavitation on glacier sliding, P. Roy. Soc. A-Math. Phy., 461,
609–627, 2005.
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.
Schroeder, D. M., Blankenship, D. D., and Young, D. A.: Evidence for a water
system transition beneath Thwaites Glacier, West Antarctica, P. Natl. Acad. Sci. USA, 110, 12225, 2013.
Schroeder, D. M., Blankenship, D. D., Young, D. A., Witus, A. E., and
Anderson, J. B.: Airborne radar sounding evidence for deformable sediments
and outcropping bedrock beneath Thwaites Glacier, West Antarctica,
Geophys. Res. Lett., 41, 7200–7208, 2014.
Shepherd, A., Gilbert, L., Muir, A. S., Konrad, H., McMillan, M., Slater,
T., Briggs, K. H., Sundal, A. V., Hogg, A. E., and Engdahl, M. E.: Trends in
Antarctic Ice Sheet Elevation and Mass, Geophys. Res. Lett., 46,
8174–8183, 2019.
Siegert, M. J., Taylor, J., Payne, A. J., and Hubbard, B.: Macro-scale bed
roughness of the Siple Coast ice streams in west Antarctica, Earth Surface
Processes and Landforms, 29, 1591–1596, 2004.
Spagnolo, M., Clark, C. D., Ely, J. C., Stokes, C. R., Anderson, J. B.,
Andreassen, K., Graham, A. G. C., and King, E. C.: Size, shape and spatial
arrangement of mega-scale glacial lineations from a large and diverse
dataset, Earth Surface Processes and Landforms, 39, 1432–1448, 2014.
Spagnolo, M., Bartholomaus, T. C., Clark, C. D., Stokes, C. R., Atkinson,
N., Dowdeswell, J. A., Ely, J. C., Graham, A. G. C., Hogan, K. A., King, E.
C., Larter, R. D., Livingstone, S. J., and Pritchard, H. D.: The periodic
topography of ice stream beds: Insights from the Fourier spectra of
mega-scale glacial lineations, J. Geophys. Res.-Earth, 122, 1355–1373, 2017.
Spiegel, C., Lindow, J., Kamp, P. J. J., Meisel, O., Mukasa, S., Lisker, F.,
Kuhn, G., and Gohl, K.: Tectonomorphic evolution of Marie Byrd Land –
Implications for Cenozoic rifting activity and onset of West Antarctic
glaciation, Global Planet. Change, 145, 98–115, 2016.
Tinto, K. J. and Bell, R. E.: Progressive unpinning of Thwaites Glacier from
newly identified offshore ridge: Constraints from aerogravity, Geophys. Res. Lett., 38, L20503, https://doi.org/10.1029/2011GL049026, 2011.
Tinto, K., Bell, R. E., and Cochran, J. R.: IceBridge Sander AIRGrav L1B Geolocated Free Air Gravity Anomalies, Version 1.05, NASA National Snow and Ice Data Center Distributed Active Archive Center, Boulder, Colorado USA, https://doi.org/10.5067/R1RQ6NRIJV89, 2010 (updated 2019).
Vanneste, M., Mienert, J., and Bünz, S.: The Hinlopen Slide: A giant,
submarine slope failure on the northern Svalbard margin, Arctic Ocean, Earth Planet Sc. Lett., 245, 373–388, 2006.
Vaughan, D. G. and Arthern, R.: Why Is It Hard to Predict the Future of Ice
Sheets?, Science, 315, 1503, 2007.
Vaughan, D. G., Smith, A.M., Corr, H. F. J., Jenkins, A., Bentley, C. R., Stenoien, M. D., Jacobs, S. S., Kellogg, T. B., Rignot, E., and Lucchitta, B. K.: A Review of Pine Island Glacier, West Antarctica: Hypotheses of Instability vs. Observations of Change, American Geophysical Union, Washington, D.C., Antarctic Research Series, 77, 237–256, 2001.
Vogt, P. R., Crane, K., and Sundvor, E.: Deep Pleistocene iceberg plowmarks
on the Yermak Plateau: sidescan and 3.5 kHz evidence for thick calving ice
fronts and a possible marine ice sheet in the Arctic Ocean, Geology, 22,
403–406, 1994.
Walker, D. P., Brandon, M. A., Jenkins, A., Allen, J. T., Dowdeswell, J. A.,
and Evans, J.: Oceanic heat transport onto the Amundsen Sea shelf through a
submarine glacial trough, Geophys. Res. Lett., 34, L02602, https://doi.org/10.1029/2006GL028154, 2007.
Weertman, J.: On the Sliding of Glaciers, J. Glaciol., 3, 33–38,
1957.
Weertman, J.: Stability of the junction between an ice sheet and an ice
shelf, J. Glaciol., 13, 3–11, 1974.
Welch, P. D.: The Use of Fast Fourier Transform for the Estimation of Power
Spectra: A Method Based on Time Averaging Over Short, Modified Periodograms,
IEEE T. Acoust. Speech., 15, 70–73, 1967.
Wellner, J. S., Heroy, D. C., and Anderson, J. B.: The death mask of the
Antarctic ice sheet: Comparison of glacial geomorphic features across the
continental shelf, Geomorphology, 75, 157–171, 2006.
Whitehouse, P. L., Bentley, M. J., Milne, G. A., King, M. A. and Thomas, I.
D.: A new glacial isostatic adjustment model for Antarctica: calibrated and
tested using observations of relative sea-level change and present-day
uplift rates, Geophys. J. Int., 190, 1464–1482, 2012.
Short summary
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.
The sea-floor geometry around the rapidly changing Thwaites Glacier is a key control on warm...
