Articles | Volume 12, issue 7
https://doi.org/10.5194/tc-12-2461-2018
© Author(s) 2018. 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-12-2461-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Jul 2018
Research article |
| 26 Jul 2018
| 26 Jul 2018
Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere–ocean variability
Frazer D. W. Christie
CORRESPONDING AUTHOR
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
Robert G. Bingham
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
Noel Gourmelen
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
Eric J. Steig
Department of Earth & Space Sciences, University of Washington,
Seattle, WA 98195-1310, USA
Rosie R. Bisset
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
Hamish D. Pritchard
NERC British Antarctic Survey, Cambridge, CB3 0ET, UK
Kate Snow
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
Simon F. B. Tett
School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
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An updated Last Millennium Reanalysis is presented, using an expanded multi-proxy database, and proxy models representing the seasonal characteristics of proxy records, in addition to the dual sensitivity to temperature and moisture of tree-ring-width chronologies. We show enhanced skill in spatial reconstructions of key climate variables in the updated reanalysis, compared to an earlier version, resulting from the combined influences of the enhanced proxy network and improved proxy modeling.
Christophe Bellisario, Helen E. Brindley, Simon F. B. Tett, Rolando Rizzi, Gianluca Di Natale, Luca Palchetti, and Giovanni Bianchini
Atmos. Chem. Phys., 19, 7927–7937, https://doi.org/10.5194/acp-19-7927-2019, https://doi.org/10.5194/acp-19-7927-2019, 2019
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We explore the possibility of inferring far-infrared downwelling radiances from mid-infrared observations to better constrain radiation schemes in climate models. Our results imply that while it is feasible to use this type of approach, the quality of the extension will be strongly dependent on the noise characteristics of the observations and on the accurate characterisation of the atmospheric state.
Damon Davies, Robert G. Bingham, Edward C. King, Andrew M. Smith, Alex M. Brisbourne, Matteo Spagnolo, Alastair G. C. Graham, Anna E. Hogg, and David G. Vaughan
The Cryosphere, 12, 1615–1628, https://doi.org/10.5194/tc-12-1615-2018, https://doi.org/10.5194/tc-12-1615-2018, 2018
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This paper investigates the dynamics of ice stream beds using repeat geophysical surveys of the bed of Pine Island Glacier, West Antarctica; 60 km of the bed was surveyed, comprising the most extensive repeat ground-based geophysical surveys of an Antarctic ice stream; 90 % of the surveyed bed shows no significant change despite the glacier increasing in speed by up to 40 % over the last decade. This result suggests that ice stream beds are potentially more stable than previously suggested.
Nancy A. N. Bertler, Howard Conway, Dorthe Dahl-Jensen, Daniel B. Emanuelsson, Mai Winstrup, Paul T. Vallelonga, James E. Lee, Ed J. Brook, Jeffrey P. Severinghaus, Taylor J. Fudge, Elizabeth D. Keller, W. Troy Baisden, Richard C. A. Hindmarsh, Peter D. Neff, Thomas Blunier, Ross Edwards, Paul A. Mayewski, Sepp Kipfstuhl, Christo Buizert, Silvia Canessa, Ruzica Dadic, Helle A. Kjær, Andrei Kurbatov, Dongqi Zhang, Edwin D. Waddington, Giovanni Baccolo, Thomas Beers, Hannah J. Brightley, Lionel Carter, David Clemens-Sewall, Viorela G. Ciobanu, Barbara Delmonte, Lukas Eling, Aja Ellis, Shruthi Ganesh, Nicholas R. Golledge, Skylar Haines, Michael Handley, Robert L. Hawley, Chad M. Hogan, Katelyn M. Johnson, Elena Korotkikh, Daniel P. Lowry, Darcy Mandeno, Robert M. McKay, James A. Menking, Timothy R. Naish, Caroline Noerling, Agathe Ollive, Anaïs Orsi, Bernadette C. Proemse, Alexander R. Pyne, Rebecca L. Pyne, James Renwick, Reed P. Scherer, Stefanie Semper, Marius Simonsen, Sharon B. Sneed, Eric J. Steig, Andrea Tuohy, Abhijith Ulayottil Venugopal, Fernando Valero-Delgado, Janani Venkatesh, Feitang Wang, Shimeng Wang, Dominic A. Winski, V. Holly L. Winton, Arran Whiteford, Cunde Xiao, Jiao Yang, and Xin Zhang
Clim. Past, 14, 193–214, https://doi.org/10.5194/cp-14-193-2018, https://doi.org/10.5194/cp-14-193-2018, 2018
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Temperature and snow accumulation records from the annually dated Roosevelt Island Climate Evolution (RICE) ice core show that for the past 2 700 years, the eastern Ross Sea warmed, while the western Ross Sea showed no trend and West Antarctica cooled. From the 17th century onwards, this dipole relationship changed. Now all three regions show concurrent warming, with snow accumulation declining in West Antarctica and the eastern Ross Sea.
Barbara Stenni, Mark A. J. Curran, Nerilie J. Abram, Anais Orsi, Sentia Goursaud, Valerie Masson-Delmotte, Raphael Neukom, Hugues Goosse, Dmitry Divine, Tas van Ommen, Eric J. Steig, Daniel A. Dixon, Elizabeth R. Thomas, Nancy A. N. Bertler, Elisabeth Isaksson, Alexey Ekaykin, Martin Werner, and Massimo Frezzotti
Clim. Past, 13, 1609–1634, https://doi.org/10.5194/cp-13-1609-2017, https://doi.org/10.5194/cp-13-1609-2017, 2017
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Within PAGES Antarctica2k, we build an enlarged database of ice core water stable isotope records. We produce isotopic composites and temperature reconstructions since 0 CE for seven distinct Antarctic regions. We find a significant cooling trend from 0 to 1900 CE across all regions. Since 1900 CE, significant warming trends are identified for three regions. Only for the Antarctic Peninsula is this most recent century-scale trend unusual in the context of last-2000-year natural variability.
Peter Kuipers Munneke, Daniel McGrath, Brooke Medley, Adrian Luckman, Suzanne Bevan, Bernd Kulessa, Daniela Jansen, Adam Booth, Paul Smeets, Bryn Hubbard, David Ashmore, Michiel Van den Broeke, Heidi Sevestre, Konrad Steffen, Andrew Shepherd, and Noel Gourmelen
The Cryosphere, 11, 2411–2426, https://doi.org/10.5194/tc-11-2411-2017, https://doi.org/10.5194/tc-11-2411-2017, 2017
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How much snow falls on the Larsen C ice shelf? This is a relevant question, because this ice shelf might collapse sometime this century. To know if and when this could happen, we found out how much snow falls on its surface. This was difficult, because there are only very few measurements. Here, we used data from automatic weather stations, sled-pulled radars, and a climate model to find that melting the annual snowfall produces about 20 cm of water in the NE and over 70 cm in the SW.
Simon F. B. Tett, Kuniko Yamazaki, Michael J. Mineter, Coralia Cartis, and Nathan Eizenberg
Geosci. Model Dev., 10, 3567–3589, https://doi.org/10.5194/gmd-10-3567-2017, https://doi.org/10.5194/gmd-10-3567-2017, 2017
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The paper shows it is possible to automatically calibrate the parameters in the atmospheric component of two climate models. The resulting atmosphere–ocean models are often, but not always, stable and realistic. The computational cost to do this is feasible. The implications are that it is possible to generate multiple configurations of a single model with different parameter values but which all look similar to the standard model and that the techniques could be used to calibrate other models.
Darren Slevin, Simon F. B. Tett, Jean-François Exbrayat, A. Anthony Bloom, and Mathew Williams
Geosci. Model Dev., 10, 2651–2670, https://doi.org/10.5194/gmd-10-2651-2017, https://doi.org/10.5194/gmd-10-2651-2017, 2017
Tyler R. Jones, James W. C. White, Eric J. Steig, Bruce H. Vaughn, Valerie Morris, Vasileios Gkinis, Bradley R. Markle, and Spruce W. Schoenemann
Atmos. Meas. Tech., 10, 617–632, https://doi.org/10.5194/amt-10-617-2017, https://doi.org/10.5194/amt-10-617-2017, 2017
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New measurement systems have been developed that continuously melt ice core samples, in contrast to other methods that analyze a single sample at a time. These newer systems are capable of reducing analysis time by many years and improving data set resolution. In this study, we introduce improved methodologies that optimize the speed, accuracy, and precision of a water isotope continuous-flow system. The presented system will be used for Antarctic and Greenland ice core projects.
Benjamin E. Smith, Noel Gourmelen, Alexander Huth, and Ian Joughin
The Cryosphere, 11, 451–467, https://doi.org/10.5194/tc-11-451-2017, https://doi.org/10.5194/tc-11-451-2017, 2017
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In this paper we investigate elevation changes of Thwaites Glacier, West Antarctica, one of the main sources of excess ice discharge into the ocean. We find that in early 2013, four subglacial lakes separated by 100 km drained suddenly, discharging more than 3 km3 of water under the fastest part of the glacier in less than 6 months. Concurrent ice-speed measurements show only minor changes, suggesting that ice dynamics are not strongly sensitive to changes in water flow.
J. Kropáček, N. Neckel, B. Tyrna, N. Holzer, A. Hovden, N. Gourmelen, C. Schneider, M. Buchroithner, and V. Hochschild
Nat. Hazards Earth Syst. Sci., 15, 2425–2437, https://doi.org/10.5194/nhess-15-2425-2015, https://doi.org/10.5194/nhess-15-2425-2015, 2015
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The supraglacial lake basin was mapped by DGPS and the SFM approach from terrestrial photographs. The maximum filling capacity of the lake was estimated, with a maximum discharge of 77.8 m3/s, calculated using an empirical relation. The flooded area in the valley was delineated by employing a raster-based hydraulic model. A coincidence of the GLOF events with high values of cumulative above-zero temperature and precipitation calculated from the HAR data set was revealed.
J. J. Fürst, G. Durand, F. Gillet-Chaulet, N. Merino, L. Tavard, J. Mouginot, N. Gourmelen, and O. Gagliardini
The Cryosphere, 9, 1427–1443, https://doi.org/10.5194/tc-9-1427-2015, https://doi.org/10.5194/tc-9-1427-2015, 2015
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We present a comprehensive high-resolution assimilation of Antarctic surface velocities with a flow model. The inferred velocities are in very good agreement with observations, even when compared to recent studies on individual shelves. This quality allows to identify a pattern in the velocity mismatch that points at pinning points not present in the input geometry. We identify seven potential pinning points around Antarctica, for now uncharted, providing prominent resistance to the ice flow.
E. C. Turner, H.-T. Lee, and S. F. B. Tett
Atmos. Chem. Phys., 15, 6561–6575, https://doi.org/10.5194/acp-15-6561-2015, https://doi.org/10.5194/acp-15-6561-2015, 2015
K. C. Rose, N. Ross, T. A. Jordan, R. G. Bingham, H. F. J. Corr, F. Ferraccioli, A. M. Le Brocq, D. M. Rippin, and M. J. Siegert
Earth Surf. Dynam., 3, 139–152, https://doi.org/10.5194/esurf-3-139-2015, https://doi.org/10.5194/esurf-3-139-2015, 2015
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We use ice-penetrating-radar data to identify a laterally continuous, gently sloping topographic block, comprising two surfaces separated by a distinct break in slope, preserved beneath the Institute and Möller ice streams, West Antarctica. We interpret these features as extensive erosion surfaces, showing that ancient (pre-glacial) surfaces can be preserved at low elevations beneath ice sheets. Different erosion regimes (e.g. fluvial and marine) may have formed these surfaces.
D. Slevin, S. F. B. Tett, and M. Williams
Geosci. Model Dev., 8, 295–316, https://doi.org/10.5194/gmd-8-295-2015, https://doi.org/10.5194/gmd-8-295-2015, 2015
C. Buizert, K. M. Cuffey, J. P. Severinghaus, D. Baggenstos, T. J. Fudge, E. J. Steig, B. R. Markle, M. Winstrup, R. H. Rhodes, E. J. Brook, T. A. Sowers, G. D. Clow, H. Cheng, R. L. Edwards, M. Sigl, J. R. McConnell, and K. C. Taylor
Clim. Past, 11, 153–173, https://doi.org/10.5194/cp-11-153-2015, https://doi.org/10.5194/cp-11-153-2015, 2015
L. Geng, J. Cole-Dai, B. Alexander, J. Erbland, J. Savarino, A. J. Schauer, E. J. Steig, P. Lin, Q. Fu, and M. C. Zatko
Atmos. Chem. Phys., 14, 13361–13376, https://doi.org/10.5194/acp-14-13361-2014, https://doi.org/10.5194/acp-14-13361-2014, 2014
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Examinations on snowpit and firn core results from Summit, Greenland suggest that there are two mechanisms leading to the observed double nitrate peaks in some years in the industrial era: 1) long-rang transport of nitrate and 2) enhanced local photochemical production of nitrate. Both of these mechanisms are related to pollution transport, as the additional nitrate from either direct transport or enhanced local photochemistry requires enhanced nitrogen sources from anthropogenic emissions.
A. P. Wright, A. M. Le Brocq, S. L. Cornford, R. G. Bingham, H. F. J. Corr, F. Ferraccioli, T. A. Jordan, A. J. Payne, D. M. Rippin, N. Ross, and M. J. Siegert
The Cryosphere, 8, 2119–2134, https://doi.org/10.5194/tc-8-2119-2014, https://doi.org/10.5194/tc-8-2119-2014, 2014
E. J. Steig, V. Gkinis, A. J. Schauer, S. W. Schoenemann, K. Samek, J. Hoffnagle, K. J. Dennis, and S. M. Tan
Atmos. Meas. Tech., 7, 2421–2435, https://doi.org/10.5194/amt-7-2421-2014, https://doi.org/10.5194/amt-7-2421-2014, 2014
B. Medley, I. Joughin, B. E. Smith, S. B. Das, E. J. Steig, H. Conway, S. Gogineni, C. Lewis, A. S. Criscitiello, J. R. McConnell, M. R. van den Broeke, J. T. M. Lenaerts, D. H. Bromwich, J. P. Nicolas, and C. Leuschen
The Cryosphere, 8, 1375–1392, https://doi.org/10.5194/tc-8-1375-2014, https://doi.org/10.5194/tc-8-1375-2014, 2014
E. D. Sofen, B. Alexander, E. J. Steig, M. H. Thiemens, S. A. Kunasek, H. M. Amos, A. J. Schauer, M. G. Hastings, J. Bautista, T. L. Jackson, L. E. Vogel, J. R. McConnell, D. R. Pasteris, and E. S. Saltzman
Atmos. Chem. Phys., 14, 5749–5769, https://doi.org/10.5194/acp-14-5749-2014, https://doi.org/10.5194/acp-14-5749-2014, 2014
M. J. Siegert, N. Ross, H. Corr, B. Smith, T. Jordan, R. G. Bingham, F. Ferraccioli, D. M. Rippin, and A. Le Brocq
The Cryosphere, 8, 15–24, https://doi.org/10.5194/tc-8-15-2014, https://doi.org/10.5194/tc-8-15-2014, 2014
P. Fretwell, H. D. Pritchard, D. G. Vaughan, J. L. Bamber, N. E. Barrand, R. Bell, C. Bianchi, R. G. Bingham, D. D. Blankenship, G. Casassa, G. Catania, D. Callens, H. Conway, A. J. Cook, H. F. J. Corr, D. Damaske, V. Damm, F. Ferraccioli, R. Forsberg, S. Fujita, Y. Gim, P. Gogineni, J. A. Griggs, R. C. A. Hindmarsh, P. Holmlund, J. W. Holt, R. W. Jacobel, A. Jenkins, W. Jokat, T. Jordan, E. C. King, J. Kohler, W. Krabill, M. Riger-Kusk, K. A. Langley, G. Leitchenkov, C. Leuschen, B. P. Luyendyk, K. Matsuoka, J. Mouginot, F. O. Nitsche, Y. Nogi, O. A. Nost, S. V. Popov, E. Rignot, D. M. Rippin, A. Rivera, J. Roberts, N. Ross, M. J. Siegert, A. M. Smith, D. Steinhage, M. Studinger, B. Sun, B. K. Tinto, B. C. Welch, D. Wilson, D. A. Young, C. Xiangbin, and A. Zirizzotti
The Cryosphere, 7, 375–393, https://doi.org/10.5194/tc-7-375-2013, https://doi.org/10.5194/tc-7-375-2013, 2013
Related subject area
Discipline: Ice sheets | Subject: Antarctic
Brief communication: Sensitivity of Antarctic ice shelf melting to ocean warming across basal melt models
Automatic grounding line delineation of DInSAR interferograms using deep learning
The impact of regional-scale upper-mantle heterogeneity on glacial isostatic adjustment in West Antarctica
Bathymetry-constrained warm-mode melt estimates derived from analysing oceanic gateways in Antarctica
Satellite data reveal details of glacial isostatic adjustment in the Amundsen Sea Embayment, West Antarctica
Review article: Feature tracing in radio-echo sounding products of terrestrial ice sheets and planetary bodies
Viscoelastic mechanics of tidally induced lake drainage in the grounding zone
A facet-based numerical model to retrieve ice sheet topography from Sentinel-3 altimetry
Current reversal leads to regime change in the Amery Ice Shelf cavity in the 21st century
Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith, and Kohler region of West Antarctica
Changes in Antarctic surface conditions and potential for ice shelf hydrofracturing from 1850 to 2200
A reconstruction of the ice thickness of the Antarctic Peninsula Ice Sheet north of 70° S
Bathymetry-constrained impact of relative sea-level change on basal melting in Antarctica
Age–depth distribution in western Dronning Maud Land, East Antarctica, and Antarctic-wide comparisons of internal reflection horizons
Assessing the sensitivity of the Vanderford Glacier, East Antarctica, to basal melt and calving
A history-matching analysis of the Antarctic Ice Sheet since the Last Interglacial – Part 1: Ice sheet evolution
Gravity-derived Antarctic bathymetry using the Tomofast-x open-source code: a case study of Vincennes Bay
Totten Ice Shelf history over the past century interpreted from satellite imagery
ISMIP6-based Antarctic projections to 2100: simulations with the BISICLES ice sheet model
Assessing the suitability of sites near Pine Island Glacier for subglacial bedrock drilling aimed at detecting Holocene retreat–readvance
Capturing Solid Earth and Ice Sheet Interactions: Insights from Reinforced Ridges in Thwaites Glacier
Modelling GNSS-observed seasonal velocity changes of the Ross Ice Shelf, Antarctica, using the Ice-sheet and Sea-level System Model (ISSM)
The surface mass balance and near-surface climate of the Antarctic ice sheet in RACMO2.4p1
Monitoring Shear-Zone Weakening in East Antarctic Outlet Glaciers through Differential InSAR Measurements
A fast and simplified subglacial hydrological model for the Antarctic Ice Sheet and outlet glaciers
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
Review Article: Antarctica’s internal architecture: Towards a radiostratigraphically-informed age–depth model of the Antarctic ice sheets
A thicker, rather than thinner, East Antarctic Ice Sheet plateau during the Last Glacial Maximum
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
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
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
Meteoric water and glacial melt in the southeastern Amundsen Sea: a time series from 1994 to 2020
Erwin Lambert and Clara Burgard
The Cryosphere, 19, 2495–2505, https://doi.org/10.5194/tc-19-2495-2025, https://doi.org/10.5194/tc-19-2495-2025, 2025
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The effect of ocean warming on Antarctic ice-sheet melting is a major source of uncertainty in estimates of future sea level rise. We compare five melt models to show that ocean warming strongly increases melting. Despite their calibration based on present-day melting, the models disagree on the amount of melt increase. In some important regions, the difference reaches a factor 100. We conclude that using various melt models is important to accurately estimate uncertainties in future sea level rise.
Sindhu Ramanath, Lukas Krieger, Dana Floricioiu, Codruț-Andrei Diaconu, and Konrad Heidler
The Cryosphere, 19, 2431–2455, https://doi.org/10.5194/tc-19-2431-2025, https://doi.org/10.5194/tc-19-2431-2025, 2025
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Grounding lines are geophysical features that divide ice masses on the bedrock and floating ice shelves. Their accurate location is required for calculating the mass balance of ice sheets and glaciers in Antarctica and Greenland. Human experts still manually detect them in satellite-based interferometric radar images, which is inefficient given the growing volume of data. We have developed an artificial-intelligence-based automatic detection algorithm to generate Antarctica-wide grounding lines.
Erica M. Lucas, Natalya Gomez, and Terry Wilson
The Cryosphere, 19, 2387–2405, https://doi.org/10.5194/tc-19-2387-2025, https://doi.org/10.5194/tc-19-2387-2025, 2025
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We investigate the effects of incorporating regional-scale lateral variability (ca. 50–100 km) in upper-mantle structure into models of Earth deformation and sea level change associated with ice mass changes in West Antarctica. Regional-scale variability in upper-mantle structure is found to impact relative sea level and crustal rate predictions for modern (last ca. 25–125 years) and projected (next ca. 300 years) ice mass changes, especially in coastal regions that undergo rapid ice mass loss.
Lena Nicola, Ronja Reese, Moritz Kreuzer, Torsten Albrecht, and Ricarda Winkelmann
The Cryosphere, 19, 2263–2287, https://doi.org/10.5194/tc-19-2263-2025, https://doi.org/10.5194/tc-19-2263-2025, 2025
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We identify potential oceanic gateways to Antarctic grounding lines based on high-resolution bathymetry data and examine the effect of access depths on ice-shelf melt rates. These gateways manifest the deepest topographic features that could channel warm water masses to the base of the ice sheet. We identify oceanic gateways in several Antarctic regions and estimate an upper bound of melt rate changes in case all warm water masses gain access to the cavities.
Matthias O. Willen, Bert Wouters, Taco Broerse, Eric Buchta, and Veit Helm
The Cryosphere, 19, 2213–2227, https://doi.org/10.5194/tc-19-2213-2025, https://doi.org/10.5194/tc-19-2213-2025, 2025
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Collapse of the West Antarctic Ice Sheet in the Amundsen Sea Embayment is likely in the near future. Vertical uplift of bedrock due to glacial isostatic adjustment stabilizes the ice sheet and may delay its collapse. So far, only spatially and temporally sparse GPS measurements have been able to observe this bedrock motion. We have combined satellite data and quantified a region-wide bedrock motion that independently matches GPS measurements. This can improve ice sheet predictions.
Hameed Moqadam and Olaf Eisen
The Cryosphere, 19, 2159–2196, https://doi.org/10.5194/tc-19-2159-2025, https://doi.org/10.5194/tc-19-2159-2025, 2025
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This is an overview of methodologies that have been applied to map the internal reflection horizons, or ice-layer boundaries, of ice sheets on Earth and other planets. We briefly explain radar applications in glaciology and the methods which have been used and published. There are summaries of the published work of the last 2 decades. Finally, we conclude by introducing the gaps and opportunities for further advancement in this field, and we present possible future directions.
Hanwen Zhang, Richard F. Katz, and Laura A. Stevens
The Cryosphere, 19, 2087–2103, https://doi.org/10.5194/tc-19-2087-2025, https://doi.org/10.5194/tc-19-2087-2025, 2025
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In Antarctica, supraglacial lakes often form near grounding lines due to surface melting. We model viscoelastic tidal flexure in these regions to assess its contribution to lake drainage via hydrofracturing. Results show that tidal flexure and lake-water pressure jointly control drainage near unconfined grounding lines. Sensitivity analysis indicates the importance of the Maxwell time of ice in modulating the tidal response.
Jérémie Aublanc, François Boy, Franck Borde, and Pierre Féménias
The Cryosphere, 19, 1937–1954, https://doi.org/10.5194/tc-19-1937-2025, https://doi.org/10.5194/tc-19-1937-2025, 2025
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In this study we developed a novel processing chain to derive the ice sheet topography from Sentinel-3 altimetry measurements (named "AMPLI"). The major innovation lies in the use of numerical simulations to geolocate the radar impact point on the ground. The performance improvement is substantial compared to ground segment processing. Furthermore, with AMPLI we show that Sentinel-3 estimates the surface elevation change of the Antarctic ice sheet with a high level of agreement with ICESat-2.
Jing Jin, Antony J. Payne, and Christopher Y. S. Bull
The Cryosphere, 19, 1873–1896, https://doi.org/10.5194/tc-19-1873-2025, https://doi.org/10.5194/tc-19-1873-2025, 2025
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The Amery Ice Shelf cavity is one of the largest cold cavities filled by relatively cold Dense Shelf Water. However, in this study, we show that warm intrusion of modified Circumpolar Deep Water flushes the Amery cavity, which changes it from a cold cavity to a warm cavity and leads to an abrupt increase in the basal melt rate in the 2060s. The shift to a warm cavity is attributed to a freshening-driven current reversal in front of the ice shelf.
Heather L. Selley, Anna E. Hogg, Benjamin J. Davison, Pierre Dutrieux, and Thomas Slater
The Cryosphere, 19, 1725–1738, https://doi.org/10.5194/tc-19-1725-2025, https://doi.org/10.5194/tc-19-1725-2025, 2025
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We used satellite observations to measure recent changes in ice speed and flow direction in the Pope, Smith, and Kohler region of West Antarctica (2005–2022). We found substantial speed-up on seven ice streams of up to 87 %. However, Kohler West Glacier has slowed by 10 %, due to the redirection of ice flow into its rapidly thinning neighbour. This process of “ice piracy” has not previously been directly observed on this rapid timescale and may influence future ice shelf and sheet mass changes.
Nicolas C. Jourdain, Charles Amory, Christoph Kittel, and Gaël Durand
The Cryosphere, 19, 1641–1674, https://doi.org/10.5194/tc-19-1641-2025, https://doi.org/10.5194/tc-19-1641-2025, 2025
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A mixed statistical–physical approach is used to reproduce the behaviour of a regional climate model. From that, we estimate the contribution of snowfall and melting at the surface of the Antarctic Ice Sheet to changes in global mean sea level. We also investigate the impact of surface melting in a warmer climate on the stability of the Antarctic ice shelves that provide back stress on the ice flow to the ocean.
Kaian Shahateet, Johannes J. Fürst, Francisco Navarro, Thorsten Seehaus, Daniel Farinotti, and Matthias Braun
The Cryosphere, 19, 1577–1597, https://doi.org/10.5194/tc-19-1577-2025, https://doi.org/10.5194/tc-19-1577-2025, 2025
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In the present work, we provide a new ice thickness reconstruction of the Antarctic Peninsula Ice Sheet north of 70º S using inversion modeling. This model consists of two steps: the first uses basic assumptions of the rheology of the glacier, and the second uses mass conservation to improve the reconstruction where the assumptions made previously are expected to fail. Validation with independent data showed that our reconstruction improved compared to other reconstructions that are available.
Moritz Kreuzer, Torsten Albrecht, Lena Nicola, Ronja Reese, and Ricarda Winkelmann
The Cryosphere, 19, 1181–1203, https://doi.org/10.5194/tc-19-1181-2025, https://doi.org/10.5194/tc-19-1181-2025, 2025
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The study investigates how changing sea levels around Antarctica can potentially affect the melting of 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 compared to climatic changes, the effect of relative sea level on ice-shelf melting is small.
Steven Franke, Daniel Steinhage, Veit Helm, Alexandra M. Zuhr, Julien A. Bodart, Olaf Eisen, and Paul Bons
The Cryosphere, 19, 1153–1180, https://doi.org/10.5194/tc-19-1153-2025, https://doi.org/10.5194/tc-19-1153-2025, 2025
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The study presents internal reflection horizons (IRHs) over an area of 450 000 km² from western Dronning Maud Land, Antarctica, spanning 4.8–91 ka. Using radar and ice core data, nine IRHs were dated and correlated with volcanic events. The data enhance our understanding of the ice sheet's age–depth architecture, accumulation, and dynamics. The findings inform ice flow models and contribute to Antarctic-wide comparisons of IRHs, supporting efforts toward a 3D age–depth ice sheet model.
Lawrence A. Bird, Felicity S. McCormack, Johanna Beckmann, Richard S. Jones, and Andrew N. Mackintosh
The Cryosphere, 19, 955–973, https://doi.org/10.5194/tc-19-955-2025, https://doi.org/10.5194/tc-19-955-2025, 2025
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Vanderford Glacier is the fastest-retreating glacier in East Antarctica and may have important implications for future ice loss from the Aurora Subglacial Basin. Our ice sheet model simulations suggest that grounding line retreat is driven by sub-ice-shelf basal melting, in which warm ocean waters melt ice close to the grounding line. We show that current estimates of basal melt are likely too low, highlighting the need for improved estimates and direct measurements of basal melt in the region.
Benoit S. Lecavalier and Lev Tarasov
The Cryosphere, 19, 919–953, https://doi.org/10.5194/tc-19-919-2025, https://doi.org/10.5194/tc-19-919-2025, 2025
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We present the evolution of the Antarctic Ice Sheet (AIS) over the last 200 kyr by means of a history-matching analysis where an updated observational database constrained ~ 10 000 model simulations. During peak glaciation at the Last Glacial Maximum (LGM), the best-fitting sub-ensemble of AIS simulations reached an excess grounded ice volume relative to the present of 9.2 to 26.5 m equivalent sea level relative to the present. The LGM AIS volume can help resolve the LGM missing-ice problem.
Lawrence A. Bird, Vitaliy Ogarko, Laurent Ailleres, Lachlan Grose, Jeremie Giraud, Felicity S. McCormack, David E. Gwyther, Jason L. Roberts, Richard S. Jones, and Andrew N. Mackintosh
EGUsphere, https://doi.org/10.5194/egusphere-2025-211, https://doi.org/10.5194/egusphere-2025-211, 2025
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The terrain of the seafloor has important controls on the access of warm water to below floating ice shelves around Antarctica. Here, we present an open-source method to infer what the seafloor looks like around the Antarctic continent, and within these ice shelf cavities, using measurements of the Earth’s gravitational field. We present an improved seafloor map for the Vincennes Bay region in East Antarctica and assess its impact on ice melt rates.
Bertie W. J. Miles, Tian Li, and Robert G. Bingham
EGUsphere, https://doi.org/10.5194/egusphere-2024-3964, https://doi.org/10.5194/egusphere-2024-3964, 2025
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Totten Glacier is the largest source of mass loss in the East Antarctic Ice Sheet, with thinning detected since the 1990s, though the onset remains unclear. Ice-speed anomalies show no acceleration since 1973, confirming imbalance by the 1970s. A century-long record of surface undulations from Landsat imagery, linked to basal melt variability, reveals an anomalous mid-20th-century period with persistently high melt rates, possibly indicating the onset time of ice shelf thinning.
James F. O'Neill, Tamsin L. Edwards, Daniel F. Martin, Courtney Shafer, Stephen L. Cornford, Hélène L. Seroussi, Sophie Nowicki, Mira Adhikari, and Lauren J. Gregoire
The Cryosphere, 19, 541–563, https://doi.org/10.5194/tc-19-541-2025, https://doi.org/10.5194/tc-19-541-2025, 2025
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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 and varying how sensitive the ice sheet is to different processes. We find that ocean temperatures increase and more snow falls on the ice sheet under stronger warming scenarios. When the ice sheet is sensitive to ocean warming, ocean melt-driven loss exceeds snowfall-driven gains, meaning that the sea level contribution is greater with more climate warming.
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
The Cryosphere, 19, 303–324, https://doi.org/10.5194/tc-19-303-2025, https://doi.org/10.5194/tc-19-303-2025, 2025
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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) to assess the suitability for subglacial 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 (74.86°S, 99.77°W).
Luc Houriez, Eric Larour, Lambert Caron, Nicole-Jeanne Schlegel, Surendra Adhikari, Erik Ivins, Tyler Pelle, Hélène Seroussi, Eric Darve, and Martin Fischer
EGUsphere, https://doi.org/10.5194/egusphere-2024-4136, https://doi.org/10.5194/egusphere-2024-4136, 2025
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We studied how interactions between the ice sheet and the Earth’s evolving surface affect the future of Thwaites Glacier in Antarctica. We find that small features in the bedrock play a major role in these interactions which can delay the glacier’s retreat by decades or even centuries. This can significantly reduce sea-level rise projections. Our work highlights resolution requirements for similar ice—earth models, and the importance of bedrock mapping efforts in Antarctica.
Francesca Baldacchino, Nicholas R. Golledge, Mathieu Morlighem, Huw Horgan, Alanna V. Alevropoulos-Borrill, Alena Malyarenko, Alexandra Gossart, Daniel P. Lowry, and Laurine van Haastrecht
The Cryosphere, 19, 107–127, https://doi.org/10.5194/tc-19-107-2025, https://doi.org/10.5194/tc-19-107-2025, 2025
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Understanding how the Ross Ice Shelf flow is changing in a warming world is important for predicting ice sheet change. Field measurements show clear intra-annual variations in ice flow; however, it is unclear what mechanisms drive this variability. We show that local perturbations in basal melt can have a significant impact on ice flow speed, but a combination of forcings is likely driving the observed variability in ice flow.
Christiaan T. van Dalum, Willem Jan van de Berg, Michiel R. van den Broeke, and Maurice van Tiggelen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3728, https://doi.org/10.5194/egusphere-2024-3728, 2025
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In this study, we present a new surface mass balance (SMB) and near-surface climate product for Antarctica with the regional climate model RACMO2.4p1. We assess the impact of major model updates on the climate of Antarctica. Locally, the SMB has changed substantially, but also agrees well with observations. In addition, we show that the SMB components, surface energy budget, albedo, pressure, temperature and wind speed compare well with in-situ and remote sensing observations.
Christian T. Wild, Reinhard Drews, Niklas Neckel, Joohan Lee, Sihyung Kim, Hyangsun Han, Won Sang Lee, Veit Helm, Sebastian Harry Reid Rosier, Oliver J. Marsh, and Wolfgang Rack
EGUsphere, https://doi.org/10.5194/egusphere-2024-3593, https://doi.org/10.5194/egusphere-2024-3593, 2024
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The stability of the Antarctic Ice Sheet depends on how resistance along the sides of large glaciers slows down the flow of ice into the ocean. We present a method to map ice strength using the effect of ocean tides on floating ice shelves. Incorporating weaker ice in shear zones improves the accuracy of model predictions compared to satellite observations. This demonstrates the untapped potential of radar satellites to map ice stiffness in the most critical areas for ice sheet stability.
Elise Kazmierczak, Thomas Gregov, Violaine Coulon, and Frank Pattyn
The Cryosphere, 18, 5887–5911, https://doi.org/10.5194/tc-18-5887-2024, https://doi.org/10.5194/tc-18-5887-2024, 2024
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We introduce a new fast model for water flow beneath the ice sheet capable of handling various hydrological and bed conditions in a unified way. 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 the efficiency of the drainage and the bed type.
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.
Robert G. Bingham, Julien A. Bodart, Marie G. P. Cavitte, Ailsa Chung, Rebecca J. Sanderson, Johannes C. R. Sutter, Olaf Eisen, Nanna B. Karlsson, Joseph A. MacGregor, Neil Ross, Duncan A. Young, David W. Ashmore, Andreas Born, Winnie Chu, Xiangbin Cui, Reinhard Drews, Steven Franke, Vikram Goel, John W. Goodge, A. Clara J. Henry, Antoine Hermant, Benjamin H. Hills, Nicholas Holschuh, Michelle R. Koutnik, Gwendolyn J.-M. C. Leysinger Vieli, Emma J. Mackie, Elisa Mantelli, Carlos Martín, Felix S. L. Ng, Falk M. Oraschewski, Felipe Napoleoni, Frédéric Parrenin, Sergey V. Popov, Therese Rieckh, Rebecca Schlegel, Dustin M. Schroeder, Martin J. Siegert, Xueyuan Tang, Thomas O. Teisberg, Kate Winter, Shuai Yan, Harry Davis, Christine F. Dow, Tyler J. Fudge, Tom A. Jordan, Bernd Kulessa, Kenichi Matsuoka, Clara J. Nyqvist, Maryam Rahnemoonfar, Matthew R. Siegfried, Shivangini Singh, Verjan Višnjević, Rodrigo Zamora, and Alexandra Zuhr
EGUsphere, https://doi.org/10.5194/egusphere-2024-2593, https://doi.org/10.5194/egusphere-2024-2593, 2024
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The ice sheets covering Antarctica have built up over millenia through successive snowfall events which become buried and preserved as internal surfaces of equal age detectable with ice-penetrating radar. This paper describes an international initiative to work together on this archival data to build a comprehensive 3-D picture of how old the ice is everywhere across Antarctica, and how this will be used to reconstruct past and predict future ice and climate behaviour.
Cari Rand, Richard S. Jones, Andrew N. Mackintosh, Brent Goehring, and Kat Lilly
EGUsphere, https://doi.org/10.5194/egusphere-2024-2674, https://doi.org/10.5194/egusphere-2024-2674, 2024
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In this study, we determine how recently samples from a mountain in East Antarctica were last covered by the East Antarctic ice sheet. By examining concentrations of carbon-14 in rock samples, we determined that all but the summit of the mountain was buried under glacial ice within the last 15 thousand years. Other methods of estimating past ice thicknesses are not sensitive enough to capture ice cover this recent, so we were previously unaware that ice at this site was thicker at this time.
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.
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.
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.
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.
Cited articles
Anandakrishnan, S., Voigt, D. E., Alley R. B., and King, M. A.: Ice Stream D
flow speed is strongly modulated by the tide beneath the Ross Ice Shelf,
Geophys. Res. Lett., 30, 1361, https://doi.org/10.1029/2002GL016329, 2003.
Arneborg, L., Wåhlin, A. K., Björk, G., Liljebladh, B., and Orsi, A.
H.: Persistent inflow of warm water onto the central Amundsen shelf, Nat.
Geosci., 5, 876–880, https://doi.org/10.1038/NGEO1644, 2012.
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.
Asay-Davis, X. S., Jourdain, N. C., and Nakayama, Y.: Developments in
simulating and parameterizing interactions between the Southern Ocean and the
Antarctic Ice Sheet, Curr. Clim. Change Rep., 3, 316–329,
https://doi.org/10.1007/s40641-017-0071-0, 2017.
Assman, K. M. and Timmerman, R.: Variability of dense water formation in
the Ross Sea, Ocean Dyn., 55, 68–87, https://doi.org/10.1007/s10236-004-0106-7, 2005.
Baines, P. G.: A model for the structure of the Antarctic Slope Front,
Deep-Sea Res. Pt II., 56, 859–873, https://doi.org/10.1016/j.dsr2.2008.10.030, 2009.
Bindschadler, R., Choi, H., Wichlacz, A., Bingham, R., Bohlander, J., Brunt,
K., Corr, H., Drews, R., Fricker, H., Hall, M., Hindmarsh, R., Kohler, J.,
Padman, L., Rack, W., Rotschky, G., Urbini, S., Vornberger, P., and Young,
N.: Getting around Antarctica: new high-resolution mappings of the grounded
and freely-floating boundaries of the Antarctic ice sheet created for the
International Polar Year, The Cryosphere, 5, 569–588,
https://doi.org/10.5194/tc-5-569-2011, 2011.
Bingham, R. G., Ferraccioli, F., King, E. C., Larter, R. D., Pritchard, H.
D., Smith, A. M., and Vaughan, D. G.: Inland thinning of West Antarctic Ice
Sheet steered along subglacial rifts, Nature, 487, 468–471,
https://doi.org/10.1038/nature11292, 2012.
Brunt, K., Fricker, H. A., Padman, L., Scambos, T., and O'Neel, S.: Mapping
the grounding zone of the Ross Ice Shelf, Antarctica, using ICESat laser
altimetry, Ann. Glaciol., 51, 71–79, https://doi.org/10.3189/172756410791392790, 2010.
Brunt, K. M., Fricker, H. A., and Padman, L.: Analysis of ice plains of the
Filchner-Ronne Ice Shelf, Antarctica, using ICESat laser altimetry, J.
Glaciol., 57, 965–975, 2011.
Christie, F. D. W., Bingham, R. G., Gourmelen, N., Tett, S. F. B., and Muto,
A.: Four-decade record of pervasive grounding line retreat along the
Bellingshausen margin of West Antarctica, Geophys. Res. Lett., 43,
5741–5749, https://doi.org/10.1002/2016GL068972, 2016.
Christie, F. D. W., Bingham, R. G., and Bisset, R. R.: Grounding line, ice
frontal position and coastal ice masks for the Marie Byrd Land Sector of West
Antarctica, 2003–2015, PANGAEA, available at:
https://doi.org/10.1594/PANGAEA.884782, 2018.
Chuter, S. J., Martin-Esañol, A., Wouters, B., and Bamber, J. L.: Mass
balance reassessment of glaciers draining into the Abbot and Getz Ice Shelves
of West Antarctica, Geophys. Res. Lett., 44, 7328–7337,
https://doi.org/10.1002/2017GL073087, 2017.
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P.,
Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P.,
Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N.,
Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S.
B., Hersbach, H., Hólm, E. V., Isaksen, L, Kållberg, P., Köhler,
M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J.,
Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and
Vitart, F.: The ERA-Interim reanalysis: configuration and performance of the
data assimilation system, Q. J. R. Meteorol. Soc., 137, 553–597,
https://doi.org/10.1002/qj.828, 2011.
Dehecq, A., Gourmelen, N., and Trouveì, E.: Deriving large-scale glacier
velocities from a complete satellite archive: Application to the
Pamir-Karakoram-Himalaya, Remote Sens. Environ., 162, 55–66,
https://doi.org/10.1016/j.rse.2015.01.031, 2015.
Depoorter, M. A., Bamber, J. L., Griggs, J. A., Lenaerts, J. T. M.,
Ligtenberg, S. R. M., van den Broeke, M. R., and Moholdt, G.: Calving fluxes
and basal melt rates of Antarctic ice shelves, Nature, 502, 89–92,
https://doi.org/10.1038/nature12567, 2013.
Dotto, T. S., Garabato, A. N., Bacon, S., Tsamados, M., Holland P. R.,
Hooley, J., Frajka-Williams, E., Ridout, A., and Meredith, M. P.: Variability
of the Ross Gyre, Southern Ocean: drivers and responses revealed by satellite
altimetry, Geophys. Res. Lett., 45, 6195–6204, https://doi.org/10.1029/2018GL078607,
2018.
Durand, G., Gagliardini, O., Favier, L., Zwinger, T., and le Meur, E.:
Impact of bedrock description on modeling ice sheet dynamics, Geophys. Res.
Lett., 38, L20501, https://doi.org/10.1029/2011GL048892, 2011.
Dutrieux, P., Vaughan, D. G., Corr, H. F. J., Jenkins, A., Holland, P. R.,
Joughin, I., and Fleming, A. H.: Pine Island Glacier Ice Shelf melt
distributed at kilometre scales, The Cryosphere, 7, 1543–1555,
https://doi.org/10.5194/tc-7-1543-2013, 2013.
Dutrieux, P., De Rydt, J., Jenkins, A., Holland, P. R., Ha, H. K., Lee, S.H.,
Steig, E. J., Ding, Q., E. Abrahamsen, E. P., and Schröder, M.: Strong sensitivity of Pine Island Glacier melting to climatic variability,
Science, 343, 174–178, https://doi.org/10.1126/science.1244341, 2014.
Foresta, L., Gourmelen, N., Pálsson, F., Nienow, P., Björnsson, H.,
and Shepherd, A.: Surface elevation change and mass balance of Icelandic ice
caps derived from swath mode CryoSat-2 altimetry, Geophys. Res. Lett., 43,
138–12, 145, https://doi.org/10.1002/2016GL071485, 2016.
Fretwell, P., Pritchard, H. D., Vaughan, D. G., Bamber, J. L., Barrand, N.
E., Bell, R., Bianchi, C., Bingham, R. G., Blankenship, D. D., Casassa, G.,
Catania, G., Callens, D., Conway, H., Cook, A. J., Corr, H. F. J., Damaske,
D., Damm, V., Ferraccioli, F., Forsberg, R., Fujita, S., Gim, Y., Gogineni,
P., Griggs, J. A., Hindmarsh, R. C. A., Holmlund, P., Holt, J. W., Jacobel,
R. W., Jenkins, A., Jokat, W., Jordan, T., King, E. C., Kohler, J., Krabill,
W., Riger-Kusk, M., Langley, K. A., Leitchenkov, G., Leuschen, C., Luyendyk,
B. P., Matsuoka, K., Mouginot, J., Nitsche, F. O., Nogi, Y., Nost, O. A.,
Popov, S. V., Rignot, E., Rippin, D. M., Rivera, A., Roberts, J., Ross, N.,
Siegert, M. J., Smith, A. M., Steinhage, D., Studinger, M., Sun, B., Tinto,
B. K., Welch, B. C., Wilson, D., Young, D. A., Xiangbin, C., and Zirizzotti,
A.: Bedmap2: improved ice bed, surface and thickness datasets for Antarctica,
The Cryosphere, 7, 375–393, https://doi.org/10.5194/tc-7-375-2013, 2013.
Fricker, H. A. and Padman, L.: Ice shelf grounding zone structure from ICESat
laser altimetry, Geophys. Res. Lett., 33, L15502, https://doi.org/10.1029/2006GL026907,
2006.
Fricker, H. A., Coleman, R., Padman, L., Scambos, T. A., Bohlander, J., and
Brunt, K. M.: Mapping the grounding zone of the Amery Ice Shelf, East
Antarctica using DInSAR, MODIS and ICESat, Antarct. Sci., 21, 515–532,
https://doi.org/10.1017/S095410200999023X, 2009.
Gardner, A. S., Moholdt, G., Scambos, T., Fahnstock, M., Ligtenberg, S., van
den Broeke, M., and Nilsson, J.: Increased West Antarctic and unchanged East
Antarctic ice discharge over the last 7 years, The Cryosphere, 12, 521–547,
https://doi.org/10.5194/tc-12-521-2018, 2018.
Good, S. A., Martin, M. J., and Rayner, N. A.: EN4: Quality controlled ocean
temperature and salinity profiles and monthly objective analyses with
uncertainty estimates, J. Geophys. Res.-Oceans, 118, 6704–6716,
https://doi.org/10.1002/2013JC009067, 2013.
Gouretski, V. and Reseghetti, F.: On depth and temperature biases in
bathythermograph data: development of a new correction scheme based on
analysis of a global ocean database, Deep-Sea Res. Pt. I, 57, 812–833,
https://doi.org/10.1016/j.dsr.2010.03.011, 2010.
Gourmelen, N., Goldberg, D., Snow, K., Henley, S., Bingham, R., Kimura, S.,
Hogg, A., Shepherd, A., Mouginot, J., Lenearts, J., Ligtenberg, S., and van
de Berg, W.: Channelized melting drives thinning under a rapidly melting
Antarctic ice shelf, Geophys. Res. Lett., 44, 9796–9804,
https://doi.org/10.1002/2017GL074929, 2017a.
Gourmelen, N., Escorihuela, M., Shepherd, A., Foresta, L., Muir, A.,
Garcia-Mondejar, A., Roca, M., Baker, S., and Drinkwater, M. R.: CryoSat-2
swath interferometric altimetry for mapping ice elevation and elevation
change, Adv. Space Res., https://doi.org/10.1016/j.asr.2017.11.014, 2017b.
Graham, A. G. C., Nitsche, F. O., and Larter, R. D.: An improved bathymetry
compilation for the Bellingshausen Sea, Antarctica, to inform ice-sheet and
ocean models, The Cryosphere, 5, 95–106, https://doi.org/10.5194/tc-5-95-2011, 2011.
Haran, T., Bohlander, J., Scambos, T., Painter, T., and Fahnestock, M.:
MODIS Mosaic of Antarctica 2008–2009 (MOA2009) Image Map, digital media,
National Snow Ice Data Center, Boulder, https://doi.org/10.7265/N5KP8037, 2014.
Helm, V., Humbert, A., and Miller, H.: Elevation and elevation change of
Greenland and Antarctica derived from CryoSat-2, The Cryosphere, 8,
1539–1559, https://doi.org/10.5194/tc-8-1539-2014, 2014.
Holland, P. R., Jenkins, A., and Holland, D. M.: Ice and ocean processes in
the Bellingshausen Sea, Antarctica, J. Geophys. Res., 115, C05020,
https://doi.org/10.1029/2008JC005219, 2010.
Jacobs, S. S.: On the nature and significance of the Antarctic Slope Front,
Mar. Chem., 35, 9–24, https://doi.org/10.1016/S0304-4203(09)90005-6, 1991.
Jacobs, S. S., Jenkins, A., Giulivi, C. F., and Dutrieux, P: Stronger ocean
circulation and increased melting under Pine Island Glacier ice shelf, Nat.
Geosci., 4, 519–523, https://doi.org/10.1038/NGEO1188, 2011.
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., 9, 4152–4168, https://doi.org/10.1002/jgrc.20298, 2013.
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,
https://doi.org/10.5670/oceanog.2016.103, 2016.
Joughin, I., Shean, D. E., Smith, B. E., and Dutrieux, P.: Grounding line
variability and subglacial lake drainage on Pine Island Glacier, Antarctica,
Geophys. Res. Lett., 43, 9093–9102, https://doi.org/10.1002/2016GL070259, 2016.
Kim, T. W., Ha, H. K., Wåhlin, A. K., Lee, S. H., Kim, C. S., Lee, J. H.,
and Cho, Y. K.: Is Ekman pumping responsible for the seasonal variation of
warm circumpolar deep water in the Amundsen Sea?, Cont. Shelf Res., 132,
38–48, https://doi.org/10.1017/CBO9781107415324.004, 2017.
Konrad, H., Gilbert, L., Cornford, S. L., Payne, A., Hogg, A., Muir, A., and
Shepherd, A.: Uneven onset and pace of ice-dynamical imbalance in the
Amundsen Sea Embayment, West Antarctica, Geophys. Res. Lett., 44, 910–918,
https://doi.org/10.1002/2016GL070733, 2017.
Lee, M. M. and Coward, A. C.: Eddy mass transport for the Southern Ocean in
an eddy-permitting global ocean model, Ocean Model., 5, 249–266,
https://doi.org/10.1016/S1463-5003(02)00044-6, 2003.
Lenaerts, J. T. M., van den Broeke, M. R., van de Berg, W. J., van
Meijgaard, E., and Kuipers Menneke, P.: A new, high-resolution surface mass
balance map of Antarctica (1979–2010) based on regional atmospheric climate
modelling, Geophys. Res. Lett., 39, GL050713, https://doi.org/10.1029/2011GL050713,
2012.
Lenaerts, J. T. M., Ligtenberg, S. R. M., Van De Berg, W. J., Van Den Broeke,
M. R., and Medley, B.: Coastal climate of West Antarctica resolved by
high-resolution climate modeling, The West Antarctic Ice Sheet Initiative
23rd Annual WAIS Workshop, Sterling, VA, USA, 3–6 October 2016, 271, 2016.
Lenaerts, J. T. M., Ligtenberg, S. R. M., Medley, B., Van De Berg, W. J.,
Konrad, H., Nicolas, J. P., Van Wessem, J. M., Trusel, L. D., Mulvaney, R.,
Tuckwell, R. J., Hogg, A. E., and Thomas, E. R.: Climate and surface mass
balance of coastal West Antarctica resolved by regional climate modelling,
Ann. Glaciol., https://doi.org/10.1017/aog.2017.42, 2017.
Ligtenberg, S. R. M., Helsen, M. M., and van den Broeke, M. R.: An improved
semi-empirical model for the densification of Antarctic firn, The Cryosphere,
5, 809–819, https://doi.org/10.5194/tc-5-809-2011, 2011.
Marshall, J. and Plumb, R. A.: Atmosphere, Ocean and Climate Dynamics: An
Introductory Text, 1st Edn., Volume 93, in: the International Geophysics
Series, edited by: Dmowska, R., Hartmann, D., and Rossby, T., Elsevier,
Burlington, California, London, 344 pp., 2008.
McGregor, S., Gupta, A. S., and England, M. E.: Constraining wind stress
products with sea surface height observations and implications for Pacific
Ocean sea level trend attribution, J. Clim., 25, 8164–9176,
https://doi.org/10.1175/JCLI-D-12-00105.1, 2012.
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, 3988–3905, https://doi.org/10.1002/2014GL060111,
2014.
Miles, B. W. J., Stokes, C. R., and Jamieson, S. S. R.: Pan-ice-sheet glacier
terminus change in East Antarctica reveals sensitivity of Wilkes Land to
sea-ice changes, Sci. Adv., 2, 1–8, https://doi.org/10.1126/sciadv.1501350, 2016.
Milillo, P., Rignot, E., Mouginot, J., Scheuchl, B., Morlighem, M., Li, X.,
and Salzer, J. T.: On the short-term grounding zone dynamics of Pine Island
glacier, West Antarctica observed with COSMO-SkyMed interferometric data,
Geophys. Res. Lett., 44, 10436–10444, https://doi.org/10.1002/2017GL074320, 2017.
Moholdt, G., Padman, L. and Fricker, H. A.: Basal mass budget of Ross and
Filchner-Ronne ice shelves, Antarctica, derived from Lagrangian analysis of
ICESat altimetry, J. Geophys. Res., 119, 2361–2380,
doi:10.1002/2014JF003171,2015.
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, https://doi.org/10.1002/2013GL059069, 2014.
Nakayama, Y., Timmermann, R., Rodehacke, C. B., Schröder, M., and
Hellmer, H. H.: Modeling the spreading of glacial meltwater from the
Amundsen and Bellingshausen Seas, Geophys. Res. Lett., 41, 7942–7949,
https://doi.org/10.1002/2014GL061600, 2014.
Nias, I. J., Cornford, S. L., and Payne, T.: Contrasting the modelled
sensitivity of the Amundsen Sea Embayment ice streams. J. Glaciol., 62,
552–562, https://doi.org/10.1017/jog.2016.40, 2016.
Nihashi, S. and Ohshima, K.: Circumpolar mapping of Antarctic coastal
polynyas and landfast sea ice: Relationship and variability, J. Clim., 28,
3650–3670, https://doi.org/10.1175/JCLI-D-14-00369.1, 2015.
Nihashi, S., Ohshima, K., and Tamura, T.: Sea-ice production in Antarctic
coastal polynyas estimated from AMSR2 data and its validation using AMSR-E
and SSM/I SSMIS data, IEEE J. Sel. Top. Appl., 10, 3912–3922,
https://doi.org/10.1109/JSTARS.2017.2731995, 2017.
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. Geophys. Geosyst., 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, in: Atlas of Submarine Glacial Landforms: Modern, Quaternary and
Ancient, edited by: Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B.
J., Dowdeswell, E. K. and Hogan, K. A., Geological Society, London,
199–200, 2016.
Orsi, A. H., Whitworth, T. III., and Nowlin Jr, W. D.: On the meridional
extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Res. I, 42,
64–673, 1995.
Ó Cofaigh, C. O., Dowdeswell, J. A., Evans, J., Hillenbrand, C. D.,
Larter, R. D., Morris, P., and Pudsey, C. J.: Flow of the West Antarctic
ice-sheet on the continental margin of the Bellingshausen Sea at the Last
Glacial Maximum, J. Geophys. Res., 110, B11103, https://doi.org/10.1029/2005JB003619,
2005.
Padman, L., Fricker, H. A., Coleman, R., Howard, S., and Erofeeva, S. Y.: A
new tidal model for the Antarctic ice shelves and seas, Ann. Glaciol., 34,
247–254, https://doi.org/10.3189/172756402781817752, 2002.
Paolo, F. S., Fricker, H. A., and Padman, L.: Volume loss from Antarctic ice
shelves is accelerating, Science, 348, 327–331,
https://doi.org/10.1126/science.aaa0940, 2015.
Paolo, F. S., Padman, L., Fricker, H. A., Adusumilli, S., Howard, S., and
Siegfried, M. R.: Response of Pacific-sector Antarctic ice shelves to the El
Niño/Southern Oscillation, Nat. Geosci., 11, 121–126,
https://doi.org/10.1038/s41561-017-0033-0, 2018.
Park, J. W., Gourmelen, N., Shepherd, A., Kim, S. W., Vaughan, D. G, and
Wingham, D. J.: Sustained retreat of the Pine Island Glacier, Geophys. Res.
Lett., 40, 2137–2142, https://doi.org/10.1002/grl.50379, 2013.
Parizek, B. R., Christianson, K., Anandakrishnan, S., Alley, R. B., Walker,
R. T., Edwards, R. A., Wolfe, D. S., Bertini, G. T., Rinehart, S. K.,
Bindschadler, R. A., and Nowicki, S. M. J.: Dynamic (in)stability of
Thwaites Glacier, West Antarctica, J. Geophys. Res., 118, 638–655,
https://doi.org/10.1002/jgrf.20044, 2013.
Pritchard, H. D., Arthern, R. J., Vaughan, D. G., and Edwards, L. A.:
Extensive dynamic thinning on the margins of the Greenland and Antarctic ice
sheets, Nature, 461, 971–975, https://doi.org/10.1038/nature08471, 2009.
Pritchard, H. D., Ligtenberg, S. R. M., Fricker, H. A., Vaughan, D. G., van
den Broeke, M. R., and Padman, L.: Antarctic ice-sheet loss driven by basal
melting of ice-sheets, Nature, 484, 502–505, https://doi.org/10.1038/nature10968, 2012.
Rignot, E., Bamber, J. L., van den Broeke, M. R., Davis, C., Li, Y., van de
Berg, W. J., and van Meijgaard, E.: Recent Antarctic ice mass loss from
radar interferometry and regional climate modelling, Nat. Geosci., 1,
106–110, https://doi.org/10.1038/ngeo102, 2008.
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., and Scheuchl, B.: MEaSUREs InSAR-Based Antarctica
Ice Velocity Map, Version 2, Boulder, Colorado USA, NASA National Snow and
Ice Data Center Distributed Active Archive Center, https://doi.org/10.5067/D7GK8F5J8M8R,
2017.
Rignot, E., Jacobs, S., Mouginot, J., and Scheuchl, B.: Ice-Shelf Melting
Around Antarctica, Science, 341, 266–270, https://doi.org/10.1126/science.1235798, 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., 421, 3502–3509, https://doi.org/10.1002/2014GL060140, 2014.
Scambos, T. A., Haran, T. M., Fahnestock, M. A., Painter, T. H., and
Bohlander, J.: MODIS-based Mosaic of Antarctica (MOA) data sets:
Continent-wide surface morphology and snow grain size, Remote Sens.
Environ., 111, 242–257, https://doi.org/10.1016/j.rse.2006.12.020, 2007.
Schoof, C.: Ice sheet grounding line dynamics: Steady states, stability, and
hysteresis, J. Geophys. Res., 112, F03S28, https://doi.org/10.1029/2006JF000664, 2007.
Schmidtko, S., Heywood, K. J., Thompson, A. F., and Aoki, S.: Multidecadal
warming of Antarctic waters, Science, 346, 1227–1231,
https://doi.org/10.1126/science.1256117, 2014.
Scheuchl, B., Mouginot, J., Rignot, E., Morlighem, M., and Khazendar, A.:
Grounding line retreat of Pope, Smith, and Kohler Glaciers, West Antarctica,
measured with Sentinel-1a radar interferometry data, Geophys. Res. Lett.,
43, 8572–8579, https://doi.org/10.1002/2016GL069287, 2016.
Shepherd, A., Wingham, D., Wallis, D., Giles, K., Laxon, S., and Sundal, A.
V.: Recent loss of floating ice and the consequent sea level contribution,
Geophys. Res. Lett., 37, L13503, https://doi.org/10.1029/2010GL042496, 2010.
Shepherd, A., Ivins, E. R., Geruo, A., Barletta, V. R., Bentley, M. J.,
Bettadpur, S., Briggs, K. H., Bromwich, D. H., Forsberg, R., Galin, N.,
Horwath, M., Jacobs, S., Joughin, I., King, M. A., Lenaerts, J. T. M., Li,
J., Ligtenberg, S. R. M., Luckman, A., Luthcke, S. B., McMillan, M., Meister,
R., Milne, G., Mouginot, J., Muir, A., Nicolas, J. P., Paden, J., Payne, A.
J., Pritchard, H., Rignot, E., Rott, H., Sørensen, L. S., Scambos, T. A.,
Scheuchl, B., Schrama, E. J. O., Smith, B., Sundal, A. V., van Angelen, J.
H., van de Berg,W. J., van den Broeke, M. R., Vaughan, D. G., Velicogna, I.,
Wahr, J., Whitehouse, P. L., Wingham, D. J., Yi, D., Young, D., and Zwally,
H. J.: A reconciled estimate of ice sheet mass balance, Science, 338,
1183–1189, https://doi.org/10.1126/science.1228102, 2012.
Smith, B. E., Gourmelen, N., Huth, A., and Joughin, I.: Connected subglacial
lake drainage beneath Thwaites Glacier, West Antarctica, The Cryosphere, 11,
451–467, https://doi.org/10.5194/tc-11-451-2017, 2017.
Smith, S. D.: Coefficients for sea surface wind stress, heat flux, and wind
profiles as a function of wind speed and temperature, J. Geophys. Res., 93,
15467–15472, https://doi.org/10.1029/JC093iC12p15467, 1988.
Steig, E. J., Ding, Q., Battisti, D. S., and Jenkins, A.: Tropical forcing
of Circumpolar Deep Water Inflow and outlet glacier thinning in the Amundsen
Sea Embayment, West Antarctica, Ann. Glaciol. 53, 19–28,
https://doi.org/10.3189/2012AoG60A110, 2012.
Stewart, A. L. and Thompson, A. F.: Eddy-mediated transport of warm
Circumpolar Deep Water across the Antarctic Shelf Break, Geophys. Res. Lett.,
42, 432–440, https://doi.org/10.1002/2014GL062281, 2015.
St-Laurent, P., Klinck, J. M., and Dinniman, M. S.: On the role of coastal
troughs in the circulation of warm Circumpolar Deep Water on Antarctic ice
shelves, J. Phys. Oceanogr., 43, 51–64, https://doi.org/10.1175/JPO-D-11-0237.1, 2013.
Sutterley, T. C., Velicogna, I., Rignot, E., Mouginot, J., Flament, T., van
den Broeke, M. R., van Wessem, J. M., and Reijmer, C. H.: Mass loss of the
Amundsen Sea Embayment of West Antarctica from four independent techniques,
Geophys. Res. Lett., 41, 8421–8428, https://doi.org/10.1002/2014GL061940, 2014.
Swithinbank, C., Williams Jr., R. S., Ferrigno, J. G., Foley, K. M., and
Rosanova, C. E.: Coastal-change and glaciological map of the Bakutis Coast
area, Antarctica: 1972–2002: U.S. Geological Survey Geologic Investigations
Series Map, I-2600-F; scale: 1 : 1 000 000, with accompanying pamphlet
(10 pp.), 2003a.
Swithinbank, C., Williams Jr, R. S., Ferrigno, J. G., Foley, K. M., Hallam,
C. A., and Rosanova, C. E.: Coastal-change and glaciological map of the
Saunders Coast area, Antarctica: 1972–1997: U.S. Geological Survey Geologic
Investigations Series Map, I-2600-G; scale: 1 : 1 000 000, with
accompanying pamphlet (9 pp.), 2003b.
Thoma, M., Jenkins, A., Holland, D., and Jacobs, S.: Modelling Circumpolar
Deep Water intrusions on the Amundsen Sea continental shelf, Antarctica,
Geophys. Res. Lett., 35, L18602, https://doi.org/10.1029/2008GL034939, 2008.
Thomas, E. R., Marshall, G., and McConnell, J.: A doubling in snow
accumulation in the western Antarctic Peninsula since 1850, Geophys. Res.
Lett., 35, L01706, https://doi.org/10.1029/2007GL032529, 2008.
Thompson, A. F.: The atmospheric ocean: eddies and jets in the Antarctic
Circumpolar Current, Phil. Trans. R. Soc. A, 366, 4529–4541,
https://doi.org/10.1098/rsta.2008.0196, 2008.
Turner, J., Orr, A., Gudmundsson, G. H., Jenkins, A., Bingham, R. G.,
Hillenbrand, C.-D., and Bracegirdle, T. J.: Atmosphere-ocean-ice interactions
in the Amundsen Sea Embayment, West Antarctica, Rev. Geophys., 55, 235–276,
https://doi.org/10.1002/2016RG000532, 2017.
Wåhlin, A. K., Yuan, X., Björk, G., and Nohr, C.: Inflow of Warm
Circumpolar Deep Water in the Central Amundsen Shelf, J. Phys. Oceanogr., 40,
1427–1434, https://doi.org/10.1175/2010JPO4431.1, 2010.
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.
Walker, D. P., Jenkins, A., Assmann, K. M., Shoosmith, D. R., and Brandon, M.
A.: Oceanographic observations at the shelf break of the Amundsen Sea,
Antarctica, J. Geophys. Res.-Oceans, 118, 2906–2918, https://doi.org/10.1002/jgrc.20212,
2013.
Webber, B. G. M., Haywood, K. J., Stevens, D. P., Dutrieux, P., Abrahamsen,
E. P., Jenkins, A., Jacobs, S. S., Ha, H. K., Lee, S. H., and Kim, T. W.:
Mechanisms driving variability in the ocean forcing of Pine Island Glacier,
Nat. Commun., 8, 14507, https://doi.org/10.1038/ncomms14507, 2017.
Whitworth III, T., Orsi, A. H., Kim, S.-J., and Nowlin Jr., W. D.: Water
masses and mixing near the Antarctic Slope Front, in: Ocean, Ice and
Atmosphere: Interactions at the Antarctic Continental Margin, Antarctic Res.
Ser., vol. 75, edited by: Jacobs, S. S. and Weiss, R. F., 1–27, AGU,
Washington, D.C., https://doi.org/10.1029/AR075p0001, 1998.
Wouters, B., Martin-Español, A., Helm, V., Flament, T., van Wessem, J.
M., Ligtenberg, S. R. M., van den Broeke, M. R., and Bamber, J. L.: Dynamic
thinning of glaciers on the Southern Antarctic Peninsula, Science, 348,
899–903, https://doi.org/10.1126/science.aaa5727, 2015.
Van Wessem, J. M., Reijmer, C. H., Morlighem, M., Mouginot, J., Rignot, E.,
Medley, B., Joughin, I., Wouters, B., Depoorter, M. A., Bamber, J. L.,
Lenaerts, J. T. M., Van De Berg, W. J., Van Den Broeke, M. R., and Van
Meijgaard, E.: Improved representation of East Antarctic surface mass balance
in a regional atmospheric climate model, J. Glaciol., 60, 761–770,
https://doi.org/10.3189/2014JoG14J051, 2014.
Van Wessem, J. M., Ligtenberg, S. R. M., Reijmer, C. H., van de Berg, W. J.,
van den Broeke, M. R., Barrand, N. E., Thomas, E. R., Turner, J., Wuite, J.,
Scambos, T. A., and van Meijgaard, E.: The modelled surface mass balance of
the Antarctic Peninsula at 5.5 km horizontal resolution, The Cryosphere, 10,
271–285, https://doi.org/10.5194/tc-10-271-2016, 2016.
Van Wyk de Vries, M., Bingham, R. G., and Hein, A. S.: A new volcanic
province: an inventory of subglacial volcanoes in West Antarctica, in:
Exploration of Subsurface Antarctica: Uncovering Past Changes and Modern Processes, edited by: Siegert, M. J., Jamieson, S. S. R., and White, D. A., Geol.
Soc., London, 461, 2017.
Vaughan, D. G., Comiso, J. C., Allison, I., Carrasco, J., Kaser, G., Kwok,
R., Mote, P., Murray, T., Paul, F., Ren, J., Rignot, E., Solomina, O.,
Steffen, K., and Zhang, T.: Observations: Cryosphere, in: Climate Change
2013: The Physical Science Basis. Contribution of Working Group I to the
Fifth Assessment Report of the Intergovernmental Panel on Climate Change,
edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S.
K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge
University Press, Cambridge, United Kingdom and New York, NY, USA, 65 pp.,
2013.
Zhang, X., Thompson, A. F., Flexas, M. M., Roquet, F., and Bornemann, H.:
Circulation and meltwater distribution in the Bellingshausen Sea: From shelf
break to coast, Geophys. Res. Lett., 43, 6402–6409,
https://doi.org/10.1002/2016GL068998, 2016.
Short summary
With a focus on the hitherto little-studied Marie Byrd Land coastline linking Antarctica's more comprehensively studied Amundsen and Ross Sea Embayments, this paper uses both satellite remote sensing (Landsat, ASTER, ICESat, and CryoSat2) and climate and ocean records (i.e. ERA-Interim, Met Office EN4 data) to examine links between ice recession, inter-decadal atmosphere-ocean forcing and other influences acting upon the Pacific-facing coastline of West Antarctica.
With a focus on the hitherto little-studied Marie Byrd Land coastline linking Antarctica's more...
