Articles | Volume 17, issue 1
https://doi.org/10.5194/tc-17-157-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-17-157-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Jan 2023
Research article |
| 16 Jan 2023
| 16 Jan 2023
Glaciological history and structural evolution of the Shackleton Ice Shelf system, East Antarctica, over the past 60 years
Sarah S. Thompson
CORRESPONDING AUTHOR
Australian Antarctic Program Partnership, Institute for Marine and
Antarctic Studies, University of Tasmania, Hobart, Tasmania, 7001, Australia
School of Biosciences, Geography and Physics, Swansea University, Swansea, UK
Bernd Kulessa
School of Biosciences, Geography and Physics, Swansea University, Swansea, UK
School of Technology, Environments and Design, University of Tasmania,
Hobart, Tasmania, 7001, Australia
Adrian Luckman
School of Biosciences, Geography and Physics, Swansea University, Swansea, UK
Jacqueline A. Halpin
Oceans and Cryosphere, Institute for Marine and Antarctic Studies, University of Tasmania,
Hobart, Tasmania, 7001, Australia
Jamin S. Greenbaum
Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San
Diego, USA
Tyler Pelle
Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San
Diego, USA
Feras Habbal
Oden Institute for Computational Engineering and Sciences, University
of Texas at Austin, Austin, Texas, USA
Jingxue Guo
Polar Research Institute of China, Shanghai, China
Lenneke M. Jong
Ice Cores Group, Australian Antarctic Division, Kingston, Tasmania, Australia
Jason L. Roberts
Ice Cores Group, Australian Antarctic Division, Kingston, Tasmania, Australia
Bo Sun
Oden Institute for Computational Engineering and Sciences, University
of Texas at Austin, Austin, Texas, USA
Donald D. Blankenship
Institute for Geophysics, University of Texas at Austin, Austin, TX,
USA
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Physical features in ice cores provide unique records of past variability. We identified 1–2 mm ice layers without bubbles in surface ice cores from Law Dome, East Antarctica, occurring on average five times per year. The origin of these bubble-free layers is unknown. In this study, we investigate whether they have the potential to record past atmospheric processes and circulation. We find that the bubble-free layers are linked to accumulation hiatus events and meridional moisture transport.
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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.
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.
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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.
Lingwei Zhang, Tessa R. Vance, Alexander D. Fraser, Lenneke M. Jong, Sarah S. Thompson, Alison S. Criscitiello, and Nerilie J. Abram
The Cryosphere, 17, 5155–5173, https://doi.org/10.5194/tc-17-5155-2023, https://doi.org/10.5194/tc-17-5155-2023, 2023
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Physical features in ice cores provide unique records of past variability. We identified 1–2 mm ice layers without bubbles in surface ice cores from Law Dome, East Antarctica, occurring on average five times per year. The origin of these bubble-free layers is unknown. In this study, we investigate whether they have the potential to record past atmospheric processes and circulation. We find that the bubble-free layers are linked to accumulation hiatus events and meridional moisture transport.
Felicity S. McCormack, Jason L. Roberts, Bernd Kulessa, Alan Aitken, Christine F. Dow, Lawrence Bird, Benjamin K. Galton-Fenzi, Katharina Hochmuth, Richard S. Jones, Andrew N. Mackintosh, and Koi McArthur
The Cryosphere, 17, 4549–4569, https://doi.org/10.5194/tc-17-4549-2023, https://doi.org/10.5194/tc-17-4549-2023, 2023
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Changes in Antarctic surface elevation can cause changes in ice and basal water flow, impacting how much ice enters the ocean. We find that ice and basal water flow could divert from the Totten to the Vanderford Glacier, East Antarctica, under only small changes in the surface elevation, with implications for estimates of ice loss from this region. Further studies are needed to determine when this could occur and if similar diversions could occur elsewhere in Antarctica due to climate change.
Alice C. Frémand, Peter Fretwell, Julien A. Bodart, Hamish D. Pritchard, Alan Aitken, Jonathan L. Bamber, Robin Bell, Cesidio Bianchi, Robert G. Bingham, Donald D. Blankenship, Gino Casassa, Ginny Catania, Knut Christianson, Howard Conway, Hugh F. J. Corr, Xiangbin Cui, Detlef Damaske, Volkmar Damm, Reinhard Drews, Graeme Eagles, Olaf Eisen, Hannes Eisermann, Fausto Ferraccioli, Elena Field, René Forsberg, Steven Franke, Shuji Fujita, Yonggyu Gim, Vikram Goel, Siva Prasad Gogineni, Jamin Greenbaum, Benjamin Hills, Richard C. A. Hindmarsh, Andrew O. Hoffman, Per Holmlund, Nicholas Holschuh, John W. Holt, Annika N. Horlings, Angelika Humbert, Robert W. Jacobel, Daniela Jansen, Adrian Jenkins, Wilfried Jokat, Tom Jordan, Edward King, Jack Kohler, William Krabill, Mette Kusk Gillespie, Kirsty Langley, Joohan Lee, German Leitchenkov, Carlton Leuschen, Bruce Luyendyk, Joseph MacGregor, Emma MacKie, Kenichi Matsuoka, Mathieu Morlighem, Jérémie Mouginot, Frank O. Nitsche, Yoshifumi Nogi, Ole A. Nost, John Paden, Frank Pattyn, Sergey V. Popov, Eric Rignot, David M. Rippin, Andrés Rivera, Jason Roberts, Neil Ross, Anotonia Ruppel, Dustin M. Schroeder, Martin J. Siegert, Andrew M. Smith, Daniel Steinhage, Michael Studinger, Bo Sun, Ignazio Tabacco, Kirsty Tinto, Stefano Urbini, David Vaughan, Brian C. Welch, Douglas S. Wilson, Duncan A. Young, and Achille Zirizzotti
Earth Syst. Sci. Data, 15, 2695–2710, https://doi.org/10.5194/essd-15-2695-2023, https://doi.org/10.5194/essd-15-2695-2023, 2023
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This paper presents the release of over 60 years of ice thickness, bed elevation, and surface elevation data acquired over Antarctica by the international community. These data are a crucial component of the Antarctic Bedmap initiative which aims to produce a new map and datasets of Antarctic ice thickness and bed topography for the international glaciology and geophysical community.
Kristian Chan, Cyril Grima, Anja Rutishauser, Duncan A. Young, Riley Culberg, and Donald D. Blankenship
The Cryosphere, 17, 1839–1852, https://doi.org/10.5194/tc-17-1839-2023, https://doi.org/10.5194/tc-17-1839-2023, 2023
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Climate warming has led to more surface meltwater produced on glaciers that can refreeze in firn to form ice layers. Our work evaluates the use of dual-frequency ice-penetrating radar to characterize these ice layers on the Devon Ice Cap. Results indicate that they are meters thick and widespread, and thus capable of supporting lateral meltwater runoff from the top of ice layers. We find that some of this meltwater runoff could be routed through supraglacial rivers in the ablation zone.
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.
Lejiang Yu, Shiyuan Zhong, Timo Vihma, Cuijuan Sui, and Bo Sun
Atmos. Chem. Phys., 23, 345–353, https://doi.org/10.5194/acp-23-345-2023, https://doi.org/10.5194/acp-23-345-2023, 2023
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Previous studies have noted a significant relationship between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices, but little is known about the stability of their relationship. We found a significant positive correlation between the two indices prior to the year 2000 but an insignificant correlation afterwards.
Sophie Goliber, Taryn Black, Ginny Catania, James M. Lea, Helene Olsen, Daniel Cheng, Suzanne Bevan, Anders Bjørk, Charlie Bunce, Stephen Brough, J. Rachel Carr, Tom Cowton, Alex Gardner, Dominik Fahrner, Emily Hill, Ian Joughin, Niels J. Korsgaard, Adrian Luckman, Twila Moon, Tavi Murray, Andrew Sole, Michael Wood, and Enze Zhang
The Cryosphere, 16, 3215–3233, https://doi.org/10.5194/tc-16-3215-2022, https://doi.org/10.5194/tc-16-3215-2022, 2022
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Terminus traces have been used to understand how Greenland's glaciers have changed over time; however, manual digitization is time-intensive, and a lack of coordination leads to duplication of efforts. We have compiled a dataset of over 39 000 terminus traces for 278 glaciers for scientific and machine learning applications. We also provide an overview of an updated version of the Google Earth Engine Digitization Tool (GEEDiT), which has been developed specifically for the Greenland Ice Sheet.
Lenneke M. Jong, Christopher T. Plummer, Jason L. Roberts, Andrew D. Moy, Mark A. J. Curran, Tessa R. Vance, Joel B. Pedro, Chelsea A. Long, Meredith Nation, Paul A. Mayewski, and Tas D. van Ommen
Earth Syst. Sci. Data, 14, 3313–3328, https://doi.org/10.5194/essd-14-3313-2022, https://doi.org/10.5194/essd-14-3313-2022, 2022
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Ice core records from Law Dome in East Antarctica, collected over the the last 3 decades, provide high-resolution data for studies of the climate of Antarctica, Australia and the Southern and Indo-Pacific oceans. Here, we present a set of annually dated records from Law Dome covering the last 2000 years. This dataset provides an update and extensions both forward and back in time of previously published subsets of the data, bringing them together into a coherent set with improved dating.
Douglas I. Benn, Adrian Luckman, Jan A. Åström, Anna J. Crawford, Stephen L. Cornford, Suzanne L. Bevan, Thomas Zwinger, Rupert Gladstone, Karen Alley, Erin Pettit, and Jeremy Bassis
The Cryosphere, 16, 2545–2564, https://doi.org/10.5194/tc-16-2545-2022, https://doi.org/10.5194/tc-16-2545-2022, 2022
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Thwaites Glacier (TG), in West Antarctica, is potentially unstable and may contribute significantly to sea-level rise as global warming continues. Using satellite data, we show that Thwaites Eastern Ice Shelf, the largest remaining floating extension of TG, has started to accelerate as it fragments along a shear zone. Computer modelling does not indicate that fragmentation will lead to imminent glacier collapse, but it is clear that major, rapid, and unpredictable changes are underway.
Johannes Oerlemans, Jack Kohler, and Adrian Luckman
The Cryosphere, 16, 2115–2126, https://doi.org/10.5194/tc-16-2115-2022, https://doi.org/10.5194/tc-16-2115-2022, 2022
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Tunabreen is a 26 km long tidewater glacier. It is the most frequently surging glacier in Svalbard, with four documented surges in the past 100 years. We have modelled this glacier to find out how it reacts to future climate change. Careful calibration was done against the observed length record for the past 100 years. For a 50 m increase in the equilibrium line altitude (ELA) the length of the glacier will be shortened by 10 km after about 100 years.
Anja Rutishauser, Donald D. Blankenship, Duncan A. Young, Natalie S. Wolfenbarger, Lucas H. Beem, Mark L. Skidmore, Ashley Dubnick, and Alison S. Criscitiello
The Cryosphere, 16, 379–395, https://doi.org/10.5194/tc-16-379-2022, https://doi.org/10.5194/tc-16-379-2022, 2022
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Recently, a hypersaline subglacial lake complex was hypothesized to lie beneath Devon Ice Cap, Canadian Arctic. Here, we present results from a follow-on targeted aerogeophysical survey. Our results support the evidence for a hypersaline subglacial lake and reveal an extensive brine network, suggesting more complex subglacial hydrological conditions than previously inferred. This hypersaline system may host microbial habitats, making it a compelling analog for bines on other icy worlds.
Lin Li, Aiguo Zhao, Tiantian Feng, Xiangbin Cui, Lu An, Ben Xu, Shinan Lang, Liwen Jing, Tong Hao, Jingxue Guo, Bo Sun, and Rongxing Li
The Cryosphere Discuss., https://doi.org/10.5194/tc-2021-332, https://doi.org/10.5194/tc-2021-332, 2021
Preprint withdrawn
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No subglacial lakes have been reported in Princess Elizabeth Land (PEL), East Antarctica. In this study, thanks to a new suite of airborne geophysical observations in PEL, including RES and gravity data collected during the Chinese National Antarctic Research Expedition, we detected a large subglacial lake of ~45 km in length, ~11 km in width, and ~250 m in depth. These findings will help us understand ice sheet stability in the PEL region.
Karen E. Alley, Christian T. Wild, Adrian Luckman, Ted A. Scambos, Martin Truffer, Erin C. Pettit, Atsuhiro Muto, Bruce Wallin, Marin Klinger, Tyler Sutterley, Sarah F. Child, Cyrus Hulen, Jan T. M. Lenaerts, Michelle Maclennan, Eric Keenan, and Devon Dunmire
The Cryosphere, 15, 5187–5203, https://doi.org/10.5194/tc-15-5187-2021, https://doi.org/10.5194/tc-15-5187-2021, 2021
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We present a 20-year, satellite-based record of velocity and thickness change on the Thwaites Eastern Ice Shelf (TEIS), the largest remaining floating extension of Thwaites Glacier (TG). TG holds the single greatest control on sea-level rise over the next few centuries, so it is important to understand changes on the TEIS, which controls much of TG's flow into the ocean. Our results suggest that the TEIS is progressively destabilizing and is likely to disintegrate over the next few decades.
Marie G. P. Cavitte, Duncan A. Young, Robert Mulvaney, Catherine Ritz, Jamin S. Greenbaum, Gregory Ng, Scott D. Kempf, Enrica Quartini, Gail R. Muldoon, John Paden, Massimo Frezzotti, Jason L. Roberts, Carly R. Tozer, Dustin M. Schroeder, and Donald D. Blankenship
Earth Syst. Sci. Data, 13, 4759–4777, https://doi.org/10.5194/essd-13-4759-2021, https://doi.org/10.5194/essd-13-4759-2021, 2021
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We present a data set consisting of ice-penetrating-radar internal stratigraphy: 26 internal reflecting horizons that cover the greater Dome C area, East Antarctica, the most extensive IRH data set to date in the region. This data set uses radar surveys collected over the span of 10 years, starting with an airborne international collaboration in 2008 to explore the region, up to the detailed ground-based surveys in support of the European Beyond EPICA – Oldest Ice (BE-OI) project.
Yaowen Zheng, Lenneke M. Jong, Steven J. Phipps, Jason L. Roberts, Andrew D. Moy, Mark A. J. Curran, and Tas D. van Ommen
Clim. Past, 17, 1973–1987, https://doi.org/10.5194/cp-17-1973-2021, https://doi.org/10.5194/cp-17-1973-2021, 2021
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South West Western Australia has experienced a prolonged drought in recent decades. The causes of this drought are unclear. We use an ice core from East Antarctica to reconstruct changes in rainfall over the past 2000 years. We find that the current drought is unusual, with only two other droughts of similar severity having occurred during this period. Climate modelling shows that greenhouse gas emissions during the industrial era are likely to have contributed to the recent drying trend.
Camilla K. Crockart, Tessa R. Vance, Alexander D. Fraser, Nerilie J. Abram, Alison S. Criscitiello, Mark A. J. Curran, Vincent Favier, Ailie J. E. Gallant, Christoph Kittel, Helle A. Kjær, Andrew R. Klekociuk, Lenneke M. Jong, Andrew D. Moy, Christopher T. Plummer, Paul T. Vallelonga, Jonathan Wille, and Lingwei Zhang
Clim. Past, 17, 1795–1818, https://doi.org/10.5194/cp-17-1795-2021, https://doi.org/10.5194/cp-17-1795-2021, 2021
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We present preliminary analyses of the annual sea salt concentrations and snowfall accumulation in a new East Antarctic ice core, Mount Brown South. We compare this record with an updated Law Dome (Dome Summit South site) ice core record over the period 1975–2016. The Mount Brown South record preserves a stronger and inverse signal for the El Niño–Southern Oscillation (in austral winter and spring) compared to the Law Dome record (in summer).
Steven J. Phipps, Jason L. Roberts, and Matt A. King
Geosci. Model Dev., 14, 5107–5124, https://doi.org/10.5194/gmd-14-5107-2021, https://doi.org/10.5194/gmd-14-5107-2021, 2021
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Simplified schemes, known as parameterisations, are sometimes used to describe physical processes within numerical models. However, the values of the parameters are uncertain. This introduces uncertainty into the model outputs. We develop a simple approach to identify plausible ranges for model parameters. Using a model of the Antarctic Ice Sheet, we find that the value of one parameter can depend on the values of others. We conclude that a single optimal set of parameter values does not exist.
Suzanne L. Bevan, Adrian J. Luckman, Douglas I. Benn, Susheel Adusumilli, and Anna Crawford
The Cryosphere, 15, 3317–3328, https://doi.org/10.5194/tc-15-3317-2021, https://doi.org/10.5194/tc-15-3317-2021, 2021
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The stability of the West Antarctic ice sheet depends on the behaviour of the fast-flowing glaciers, such as Thwaites, that connect it to the ocean. Here we show that a large ocean-melted cavity beneath Thwaites Glacier has remained stable since it first formed, implying that, in line with current theory, basal melt is now concentrated close to where the ice first goes afloat. We also show that Thwaites Glacier continues to thin and to speed up and that continued retreat is therefore likely.
X. Cui, S. Lang, L. Li, and B. Sun
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B3-2021, 449–453, https://doi.org/10.5194/isprs-archives-XLIII-B3-2021-449-2021, https://doi.org/10.5194/isprs-archives-XLIII-B3-2021-449-2021, 2021
Lisa Craw, Adam Treverrow, Sheng Fan, Mark Peternell, Sue Cook, Felicity McCormack, and Jason Roberts
The Cryosphere, 15, 2235–2250, https://doi.org/10.5194/tc-15-2235-2021, https://doi.org/10.5194/tc-15-2235-2021, 2021
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Ice sheet and ice shelf models rely on data from experiments to accurately represent the way ice moves. Performing experiments at the temperatures and stresses that are generally present in nature takes a long time, and so there are few of these datasets. Here, we test the method of speeding up an experiment by running it initially at a higher temperature, before dropping to a lower target temperature to generate the relevant data. We show that this method can reduce experiment time by 55 %.
Lucas H. Beem, Duncan A. Young, Jamin S. Greenbaum, Donald D. Blankenship, Marie G. P. Cavitte, Jingxue Guo, and Sun Bo
The Cryosphere, 15, 1719–1730, https://doi.org/10.5194/tc-15-1719-2021, https://doi.org/10.5194/tc-15-1719-2021, 2021
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Radar observation collected above Titan Dome of the East Antarctic Ice Sheet is used to describe ice geometry and test a hypothesis that ice beneath the dome is older than 1 million years. An important climate transition occurred between 1.25 million and 700 thousand years ago, and if ice old enough to study this period can be removed as an ice core, new insights into climate dynamics are expected. The new observations suggest the ice is too young – more likely 300 to 800 thousand years old.
Guitao Shi, Hongmei Ma, Zhengyi Hu, Zhenlou Chen, Chunlei An, Su Jiang, Yuansheng Li, Tianming Ma, Jinhai Yu, Danhe Wang, Siyu Lu, Bo Sun, and Meredith G. Hastings
The Cryosphere, 15, 1087–1095, https://doi.org/10.5194/tc-15-1087-2021, https://doi.org/10.5194/tc-15-1087-2021, 2021
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It is important to understand atmospheric chemistry over Antarctica under a changing climate. Thus snow collected on a traverse from the coast to Dome A was used to investigate variations in snow chemistry. The non-sea-salt fractions of K+, Mg2+, and Ca2+ are associated with terrestrial inputs, and nssCl− is from HCl. In general, proportions of non-sea-salt fractions of ions to the totals are higher in the interior areas than on the coast, and the proportions are higher in summer than in winter.
Rupert Gladstone, Benjamin Galton-Fenzi, David Gwyther, Qin Zhou, Tore Hattermann, Chen Zhao, Lenneke Jong, Yuwei Xia, Xiaoran Guo, Konstantinos Petrakopoulos, Thomas Zwinger, Daniel Shapero, and John Moore
Geosci. Model Dev., 14, 889–905, https://doi.org/10.5194/gmd-14-889-2021, https://doi.org/10.5194/gmd-14-889-2021, 2021
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Retreat of the Antarctic ice sheet, and hence its contribution to sea level rise, is highly sensitive to melting of its floating ice shelves. This melt is caused by warm ocean currents coming into contact with the ice. Computer models used for future ice sheet projections are not able to realistically evolve these melt rates. We describe a new coupling framework to enable ice sheet and ocean computer models to interact, allowing projection of the evolution of melt and its impact on sea level.
Anna L. Flack, Anthony S. Kiem, Tessa R. Vance, Carly R. Tozer, and Jason L. Roberts
Hydrol. Earth Syst. Sci., 24, 5699–5712, https://doi.org/10.5194/hess-24-5699-2020, https://doi.org/10.5194/hess-24-5699-2020, 2020
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Palaeoclimate information was analysed for eastern Australia to determine when (and where) there was agreement about the timing of wet and dry epochs in the pre-instrumental period (1000–1899). The results show that instrumental records (~1900–present) underestimate the full range of rainfall variability that has occurred. When coupled with projected impacts of climate change and growing demands, these results highlight major challenges for water resource management and infrastructure.
Lejiang Yu, Shiyuan Zhong, Cuijuan Sui, and Bo Sun
Atmos. Chem. Phys., 20, 13753–13770, https://doi.org/10.5194/acp-20-13753-2020, https://doi.org/10.5194/acp-20-13753-2020, 2020
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The recent increasing trend of "warm Arctic, cold continents" has attracted much attention, but it remains debatable as to what forces are behind this phenomenon. Sea surface temperature (SST) over the central North Pacific and the North Atlantic oceans influences the trend. On an interdecadal timescale, the recent increase in the occurrences of the warm Arctic–cold Eurasia pattern is a fragment of the interdecadal variability of SST over the Atlantic Ocean and over the central Pacific Ocean.
Xiangbin Cui, Hafeez Jeofry, Jamin S. Greenbaum, Jingxue Guo, Lin Li, Laura E. Lindzey, Feras A. Habbal, Wei Wei, Duncan A. Young, Neil Ross, Mathieu Morlighem, Lenneke M. Jong, Jason L. Roberts, Donald D. Blankenship, Sun Bo, and Martin J. Siegert
Earth Syst. Sci. Data, 12, 2765–2774, https://doi.org/10.5194/essd-12-2765-2020, https://doi.org/10.5194/essd-12-2765-2020, 2020
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We present a topographic digital elevation model (DEM) for Princess Elizabeth Land (PEL), East Antarctica. The DEM covers an area of approximately 900 000 km2 and was built from radio-echo sounding data collected in four campaigns since 2015. Previously, to generate the Bedmap2 topographic product, PEL’s bed was characterised from low-resolution satellite gravity data across an otherwise large (>200 km wide) data-free zone.
Suzanne Bevan, Adrian Luckman, Harry Hendon, and Guomin Wang
The Cryosphere, 14, 3551–3564, https://doi.org/10.5194/tc-14-3551-2020, https://doi.org/10.5194/tc-14-3551-2020, 2020
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In February 2020, along with record-breaking high temperatures in the region, satellite images showed that the surface of the largest remaining ice shelf on the Antarctic Peninsula was experiencing a lot of melt. Using archived satellite data we show that this melt was greater than any in the past 40 years. The extreme melt followed unusual weather patterns further north, highlighting the importance of long-range links between the tropics and high latitudes and the impact on ice-shelf stability.
Syed Abdul Salam, Jason L. Roberts, Felicity S. McCormack, Richard Coleman, and Jacqueline A. Halpin
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2020-146, https://doi.org/10.5194/essd-2020-146, 2020
Publication in ESSD not foreseen
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Accurate estimates of englacial temperature and geothermal heat flux are incredibly important
for constraining model simulations of ice dynamics (e.g. viscosity is temperature-dependent) and sliding. However, we currently have few direct measurements of vertical temperature (i.e. only at boreholes/ice domes) and geothermal heat flux in Antarctica. This method derives attenuation rates, that can then be mapped directly to englacial temperatures and geothermal heat flux.
Hélène Seroussi, 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, Roderik S. W. van de Wal, Ricarda Winkelmann, Chen Zhao, Tong Zhang, and Thomas Zwinger
The Cryosphere, 14, 3033–3070, https://doi.org/10.5194/tc-14-3033-2020, https://doi.org/10.5194/tc-14-3033-2020, 2020
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The Antarctic ice sheet has been losing mass over at least the past 3 decades in response to changes in atmospheric and oceanic conditions. This study presents an ensemble of model simulations of the Antarctic evolution over the 2015–2100 period based on various ice sheet models, climate forcings and emission scenarios. Results suggest that the West Antarctic ice sheet will continue losing a large amount of ice, while the East Antarctic ice sheet could experience increased snow accumulation.
Cited articles
Adusumilli, S., Fricker, H. A., Medley, B., Padman, L., and Siegfried, M. R.:
Interannual variations in meltwater input to the Southern Ocean from
Antarctic ice shelves, Nat. Geosci., 13, 616–620,
https://doi.org/10.1038/s41561-020-0616-z, 2020.
Arndt, J. E., Schenke, H. W., Jakobsson, M., Nitsche, F., Buys, G., Goleby,
B., Rebesco, M., Bohoyo, F., Hong, J. K., Black, J., Greku, R., Udintsev,
G., Barrios, F., Reynoso-Peralta, W., Morishita, T., 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.
Arthur, J. F., Stokes, C. R., Jamieson, S. S. R., Carr, J. R., and Leeson, A. A.: Distribution and seasonal evolution of supraglacial lakes on Shackleton Ice Shelf, East Antarctica, The Cryosphere, 14, 4103–4120, https://doi.org/10.5194/tc-14-4103-2020, 2020.
Bell, R. E., Banwell, A. F., Trusel, L. D., and Kingslake, J.: Antarctic
surface hydrology and impacts on ice-sheet mass balance, Nat. Clim. Change,
8, 1044–1052, https://doi.org/10.1038/s41558-018-0326-3, 2018.
Benn, D. I., Jones, R. L., Luckman, A., Fürst, J. J., Hewitt, I., and
Sommer, C.: Mass and enthalpy budget evolution during the surge of a
polythermal glacier: a test of theory, J. Glaciol., 65, 717–731,
https://doi.org/10.1017/JOG.2019.63, 2019.
Brancato, V., Rignot, E., Milillo, P., Morlighem, M., Mouginot, J., An, L.,
Scheuchl, B., Jeong, S., Rizzoli, P., Bueso Bello, J. L., and Prats-Iraola,
P.: Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With
COSMO-SkyMed Radar Interferometry Data, Geophys. Res. Lett., 47,
e2019GL086291, https://doi.org/10.1029/2019GL086291, 2020.
Campbell, S., Courville, Z., Sinclair, S., and Wilner, J.: Brine, englacial
structure and basal properties near the terminus of McMurdo Ice Shelf,
Antarctica, Ann. Glaciol., 58, 1–11, https://doi.org/10.1017/aog.2017.26, 2017.
Cook, S., Galton-Fenzi, B. K., Ligtenberg, S. R. M., and Coleman, R.: Brief communication: widespread potential for seawater infiltration on Antarctic ice shelves, The Cryosphere, 12, 3853–3859, https://doi.org/10.5194/tc-12-3853-2018, 2018.
Cui, X., Greenbaum, J. S., Beem, L. H., Guo, J., Ng, G., Li, L.,
Blankenship, D., and Sun, B.: The First Fixed-wing Aircraft for Chinese
Antarctic Expeditions: Airframe, modifications, Scientific Instrumentation
and Applications, J. Environ. Eng. Geophys., 23, 1–13,
https://doi.org/10.2113/JEEG23.1.1/ASSET/IMAGES/LARGE/I1083-1363-23-1-1-F01.JPEG, 2018.
De Almeida Ribeiro, I., Gomes De Aguiar Veiga, R. and De Koning, M.: Effect
of Sodium Chloride on Internal Quasi-Liquid Layers in Ice Ih, J. Phys. Chem.
C, 125, 18526–18535, https://doi.org/10.1021/acs.jpcc.1c05461, 2021.
Dow, C. F., McCormack, F. S., Young, D. A., Greenbaum, J. S., Roberts, J. L.,
and Blankenship, D. D.: Totten Glacier subglacial hydrology determined from
geophysics and modeling, Earth Planet. Sci. Lett., 531, 115961,
https://doi.org/10.1016/j.epsl.2019.115961, 2020.
Flament, T. and Rémy, F.: Dynamic thinning of Antarctic glaciers from
along-track repeat radar altimetry, J. Glaciol., 58, 830–840,
https://doi.org/10.3189/2012JoG11J118, 2012.
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.
Fürst, J. J., Durand, G., Gillet-Chaulet, F., Merino, N., Tavard, L., Mouginot, J., Gourmelen, N., and Gagliardini, O.: Assimilation of Antarctic velocity observations provides evidence for uncharted pinning points, The Cryosphere, 9, 1427–1443, https://doi.org/10.5194/tc-9-1427-2015, 2015.
Fürst, J. J., Durand, G., Gillet-chaulet, F., Tavard, L., Rankl, M.,
Braun, M., and Gagliardini, O.: The safety band of Antarctic ice shelves,
Nat. Clim. Chang., 6, 2014–2017, https://doi.org/10.1038/NCLIMATE2912, 2016.
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.
Gardner, A. S., Fahnestock, M. A., and Scambos, T. A.: ITS_LIVE Regional Glacier and Ice Sheet Surface Velocities, Data Arch. Natl.
Snow Ice Data Cent. [data set], https://doi.org/10.5067/6II6VW8LLWJ7, 2019.
Glasser, N. F., Kulessa, B., Luckman, A., Jansen, D., King, E. C., Sammonds,
P. R., Scambos, T. A., and Jezek, K. C.: Surface structure and stability of
the Larsen C ice shelf, Antarctic Peninsula, J. Glaciol., 55, 400–410,
https://doi.org/10.3189/002214309788816597, 2009.
Greenbaum, J. S., Blankenship, D. D., Young, D. A., Richter, T. G., Roberts,
J. L., Aitken, A. R. A., Legresy, B., Schroeder, D. M., Warner, R. C., van
Ommen, T. D., and Siegert, M. J.: Ocean access to a cavity beneath Totten
Glacier in East Antarctica, Nat. Geosci., 8, 294–298,
https://doi.org/10.1038/ngeo2388, 2015.
Greene, C. A., Gardner, A. S., Schlegel, N.-J., and Fraser, A. D.: Antarctic
calving loss rivals ice-shelf thinning, Nature, 2022, 1–6,
https://doi.org/10.1038/s41586-022-05037-w, 2022.
Grima, C., Greenbaum, J. S., Lopez Garcia, E. J., Soderlund, K. M., Rosales,
A., Blankenship, D. D., and Young, D. A.: Radar detection of the brine extent
at McMurdo Ice Shelf, Antarctica, and its control by snow accumulation,
Geophys. Res. Lett., 43, 7011–7018, https://doi.org/10.1002/2016GL069524, 2016.
Gudmundsson, G. H., Paolo, F. S., Adusumilli, S., and Fricker, H. A.:
Instantaneous Antarctic ice sheet mass loss driven by thinning ice shelves,
Geophys. Res. Lett., 46, 13903–13909, https://doi.org/10.1029/2019GL085027, 2019.
Heine, A. J.: Brine in ihe McMurdo ice shelf, Antarctica, New Zeal. J. Geol.
Geophys., 11, 829–839, https://doi.org/10.1080/00288306.1968.10420755, 1968.
Herraiz-Borreguero, L. and Naveira Garabato, A. C.: Poleward shift of
Circumpolar Deep Water threatens the East Antarctic Ice Sheet, Nat. Clim.
Change, 128, 728–734, https://doi.org/10.1038/s41558-022-01424-3, 2022.
Hoffman, M. J., Perego, M., Andrews, L. C., Price, S. F., Neumann, T. A.,
Johnson, J. V., Catania, G., and Lüthi, M. P.: Widespread Moulin
Formation During Supraglacial Lake Drainages in Greenland, Geophys. Res.
Lett., 45, 778–788, https://doi.org/10.1002/2017GL075659, 2018.
Hogg, A. E., Gilbert, L., Shepherd, A., Muir, A. S., and McMillan, M.:
Extending the record of Antarctic ice shelf thickness change, from 1992 to
2017, Adv. Sp. Res., 68, 724–731, https://doi.org/10.1016/J.ASR.2020.05.030, 2021.
Inoue, M., Curran, M. A. J., Moy, A. D., van Ommen, T. D., Fraser, A. D., Phillips, H. E., and Goodwin, I. D.: A glaciochemical study of the 120 m ice core from Mill Island, East Antarctica, Clim. Past, 13, 437–453, https://doi.org/10.5194/cp-13-437-2017, 2017.
Jenkins, A.: Convection-Driven Melting near the Grounding Lines of Ice
Shelves and Tidewater Glaciers, J. Phys. Oceanogr., 41, 2279–2294,
https://doi.org/10.1175/jpo-d-11-03.1, 2011.
Kovacs, A., Gow, A. J., Cragin, J. H., and Morey, R. M.: The brine zone in
the McMurdo Ice Shelf, Antarctica, Ann. Glaciol., 3, 1–982,
https://doi.org/10.3189/s0260305500002718, 1982.
Kuipers Munneke, P., Ligtenberg, S. R. M., Van Den Broeke, M. R., and
Vaughan, D. G.: Firn air depletion as a precursor of Antarctic ice-shelf
collapse, J. Glaciol., 60, 205–214, https://doi.org/10.3189/2014JoG13J183, 2014.
Kuipers Munneke, P., McGrath, D., Medley, B., Luckman, A., Bevan, S., Kulessa, B., Jansen, D., Booth, A., Smeets, P., Hubbard, B., Ashmore, D., Van den Broeke, M., Sevestre, H., Steffen, K., Shepherd, A., and Gourmelen, N.: Observationally constrained surface mass balance of Larsen C ice shelf, Antarctica, The Cryosphere, 11, 2411–2426, https://doi.org/10.5194/tc-11-2411-2017, 2017.
Kulessa, B., Jansen, D., Luckman, A. J., King, E. C., and Sammonds, P. R.:
Marine ice regulates the future stability of a large Antarctic ice shelf,
Nat. Commun., 5, 3707, https://doi.org/10.1038/ncomms4707, 2014.
Kulessa, B., Booth, A. D., O'Leary, M., McGrath, D., King, E. C., Luckman,
A. J., Holland, P. R., Jansen, D., Bevan, S. L., Thompson, S. S., and
Hubbard, B.: Seawater softening of suture zones inhibits fracture
propagation in Antarctic ice shelves, Nat. Commun., 10, 1–12,
https://doi.org/10.1038/s41467-019-13539-x, 2019.
Larour, E., Rignot, E., Poinelli, M., and Scheuchl, B.: Physical processes
controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the
calving of iceberg A68, P. Natl. Acad. Sci. USA, 118, 2105080118,
https://doi.org/10.1073/pnas.2105080118, 2021.
Liang, Q., Zhou, C., and Zheng, L.: Mapping Basal Melt under the Shackleton
Ice Shelf, East Antarctica, from CryoSat-2 Radar Altimetry, IEEE J. Sel.
Top. Appl., 14, 5091–5099,
https://doi.org/10.1109/JSTARS.2021.3077359, 2021.
Liang, Q. I., Zhou, C., Howat, I. A. N. M., Jeong, S., Liu, R., and Chen, Y.:
Ice flow variations at Polar Record Glacier, East Antarctica, J. Glaciol.,
65, 279–287, https://doi.org/10.1017/JOG.2019.6, 2019.
Luckman, A., Quincey, D., and Bevan, S.: The potential of satellite radar
interferometry and feature tracking for monitoring flow rates of Himalayan
glaciers, Remote Sens. Environ., 111, 172–181,
https://doi.org/10.1016/j.rse.2007.05.019, 2007.
McGrath, D., Steffen, K., Holland, P. R., Scambos, T., Rajaram, H.,
Abdalati, W., Rignot, E., Steffen, K., McGrath, D., Scambos, T., and
Abdalati, W.: The structure and effect of suture zones in the Larsen C Ice
Shelf, Antarctica, J. Geophys. Res.-Earth, 119, 588–602,
https://doi.org/10.1002/2013jf002935, 2014.
Miles, B. W. J., Jordan, J. R., Stokes, C. R., Jamieson, S. S. R., Gudmundsson, G. H., and Jenkins, A.: Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration, The Cryosphere, 15, 663–676, https://doi.org/10.5194/tc-15-663-2021, 2021.
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., van den Broeke, M.
R., van Ommen, T. D., van Wessem, M., 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,
2020.
Mouginot, J., Scheuch, B., and Rignot, E.: Mapping of Ice Motion in
Antarctica Using Synthetic-Aperture Radar Data, Remote Sens., 4,
2753–2767, https://doi.org/10.3390/RS4092753, 2012.
Mouginot, J., Rignot, E., and Scheuchl, B.: Continent-Wide, Interferometric
SAR Phase, Mapping of Antarctic Ice Velocity, Geophys. Res. Lett., 46,
9710–9718, https://doi.org/10.1029/2019GL083826, 2019.
Neal, C. S.: The Dynamics of the Ross Ice Shelf Revealed by Radio
Echo-Sounding, J. Glaciol., 24, 295–307, https://doi.org/10.3189/s0022143000014817,
1979.
Peters, M. E., Blankenship, D. D., Carter, S. P., Kempf, S. D., Young, D. A.,
and Holt, J. W.: Along-track focusing of airborne radar sounding data from
west antarctica for improving basal reflection analysis and layer detection,
IEEE T. Geosci. Remote, 45, 2725–2736,
https://doi.org/10.1109/TGRS.2007.897416, 2007.
Rignot, E., Mouginot, J., and Scheuchl, B.: Ice Flow of the Antarctic Ice
Sheet, Science, 333, 1427–1430, https://doi.org/10.1126/science.1208336,
2011.
Rignot, E., Jacobs, S., Mouginot, J., Scheuchl, B., 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., and Popov, S. V.:
Ice-shelf melting around Antarctica, Science, 341, 266–270,
https://doi.org/10.1126/science.1235798, 2013.
Rignot, E., Mouginot J., and Scheuchl, B.: MEaSUREs InSAR-Based Antarctica
Ice Velocity Map, Version 2, NASA Natl. Snow Ice Data Cent. Distrib. Act.
Arch. Cent. [data set], https://doi.org/10.5067/D7GK8F5J8M8R, 2017.
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, 1095–1103,
https://doi.org/10.1073/pnas.1812883116, 2019.
Risk, G. F. and Hochstein, M. P.: Subsurface Measurements on the Mcmurdo Ice
Shelf, Antarctica, New Zeal. J. Geol. Geophys., 10, 484–497,
https://doi.org/10.1080/00288306.1967.10426753, 1967.
Scambos, T., Fricker, H. A., Liu, C. C., Bohlander, J., Fastook, J.,
Sargent, A., Massom, R. and Wu, A. M.: Ice shelf disintegration by plate
bending and hydro-fracture: Satellite observations and model results of the
2008 Wilkins ice shelf break-ups, Earth Planet. Sci. Lett., 280,
51–60, https://doi.org/10.1016/J.EPSL.2008.12.027, 2009.
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.
Silvano, A., Rintoul, S., and Herraiz-Borreguero, L.: Ocean-Ice Shelf
Interaction in East Antarctica, Oceanography, 29, 130–143,
https://doi.org/10.5670/oceanog.2016.105, 2016.
Smith, B. M. E. and Evans, S.: Radio Echo Sounding: Absorption and
Scattering by Water Inclusion and Ice Lenses, J. Glaciol., 11, 133–146,
https://doi.org/10.3189/s0022143000022541, 1972.
Stål, T., Reading, A. M., Halpin, J. A., and Whittaker, J. M.: Antarctic
Geothermal Heat Flow Model: Aq1, Geochem. Geophy. Geosy., 22, 2020GC009428,
https://doi.org/10.1029/2020GC009428, 2021.
Stephenson, S. N., Boulevard, F., and Zwally, H. J.: Ice-shelf topography and
structure determined using satellite-radar altimetry and landsat imagery,
Ann. Glaciol., 12, 162–169, 1989.
Stokes, C. R., Sanderson, J. E., Miles, B. W. J., Jamieson, S. S. R., and
Leeson, A. A.: Widespread distribution of supraglacial lakes around the
margin of the East Antarctic Ice Sheet, Sci. Rep., 9, 1–14,
https://doi.org/10.1038/s41598-019-50343-5, 2019.
Sundal, A. V., Shepherd, A., Nienow, P., Hanna, E., Palmer, S., and
Huybrechts, P.: Melt-induced speed-up of Greenland ice sheet offset by
efficient subglacial drainage, Nature, 469, 521–524,
https://doi.org/10.1038/nature09740, 2011.
Thomas, R. H.: Liquid Brine in Ice Shelves, J. Glaciol., 14, 125–136,
https://doi.org/10.3189/s0022143000013459, 1975.
Trusel, L. D., Frey, K. E., Das, S. B., Munneke, P. K., and Van Den Broeke,
M. R.: Satellite-based estimates of Antarctic surface meltwater fluxes,
Geophys. Res. Lett., 40, 6148–6153, https://doi.org/10.1002/2013GL058138, 2013.
Vaughan, D. G., Mantripp, D. R., Sievers, J., and Doake, C. S. M.: A
synthesis of remote sensing data on Wilkins Ice Shelf, Antarctica, Ann.
Glaciol., 17, 211–218, https://doi.org/10.3189/s0260305500012866, 1993.
Walford, M. E. R.: Radio echo sounding through an ice shelf, Nature,
204, 317–319, https://doi.org/10.1038/204317a0, 1964.
Watkins, R. H., Bassis, J. N., and Thouless, M. D.: Roughness of Ice Shelves Is Correlated With Basal Melt Rates, Geophys. Res. Lett., 48, e2021GL094743, https://doi.org/10.1029/2021GL094743, 2021.
Wei, W., Blankenship, D. D., Greenbaum, J. S., Gourmelen, N., Dow, C. F., Richter, T. G., Greene, C. A., Young, D. A., Lee, S., Kim, T.-W., Lee, W. S., and Assmann, K. M.: Getz Ice Shelf melt enhanced by freshwater discharge from beneath the West Antarctic Ice Sheet, The Cryosphere, 14, 1399–1408, https://doi.org/10.5194/tc-14-1399-2020, 2020.
van Wijk, E. M., Rintoul, S. R., Wallace, L. O., Ribeiro, N., and
Herraiz-Borreguero, L.: Vulnerability of Denman Glacier to Ocean Heat Flux
Revealed by Profiling Float Observations, Geophys. Res. Lett., 49, 2022GL100460,
https://doi.org/10.1029/2022GL100460, 2022.
Young, D. A., Wright, A. P., Roberts, J. L., Warner, R. C., Young, N. W.,
Greenbaum, J. S., Schroeder, D. M., Holt, J. W., Sugden, D. E., Blankenship,
D. D., van Ommen, T. D., and Siegert, M. J.: A dynamic early East Antarctic
Ice Sheet suggested by ice-covered fjord landscapes, Nature, 474, 10114, https://doi.org/10.1038/nature10114, 2011.
Young, N.: Surface velocities of Denman Glacier, Antarctica, derived from
Landsat imagery, Ann. Glaciol., 12, 218, https://doi.org/10.3189/S0260305500007497, 1989.
Zheng, L., Zhou, C., Liu, R., and Sun, Q.: Antarctic snowmelt detected by
diurnal variations of AMSR-E brightness temperature, Remote Sens., 10, 1319,
https://doi.org/10.3390/rs10091391, 2018.
Short summary
We use satellite imagery and ice penetrating radar to investigate the stability of the Shackleton system in East Antarctica. We find significant changes in surface structures across the system and observe a significant increase in ice flow speed (up to 50 %) on the floating part of Scott Glacier. We conclude that knowledge remains woefully insufficient to explain recent observed changes in the grounded and floating regions of the system.
We use satellite imagery and ice penetrating radar to investigate the stability of the...
