Articles | Volume 14, issue 11
https://doi.org/10.5194/tc-14-4021-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-4021-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Nov 2020
Research article |
| 14 Nov 2020
| 14 Nov 2020
Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica
Polar Research Center, Institute for Polar Science and Engineering,
Jilin University, 130021 Changchun, China
Yazhou Li
CORRESPONDING AUTHOR
Polar Research Center, Institute for Polar Science and Engineering,
Jilin University, 130021 Changchun, China
Laurent Augustin
Division Technique de l'INSU, CNRS, 83507 La Seyne sur Mer, France
Gary D. Clow
Institute of Arctic and Alpine Research, University of Colorado
Boulder, Boulder, Colorado, USA
Jialin Hong
Polar Research Center, Institute for Polar Science and Engineering,
Jilin University, 130021 Changchun, China
Eric Lefebvre
Université Grenoble Alpes, CNRS, IRD, IGE, 38000 Grenoble, France
Alexey Markov
Polar Research Center, Institute for Polar Science and Engineering,
Jilin University, 130021 Changchun, China
Hideaki Motoyama
National Institute of Polar Research, Tokyo, Japan
Catherine Ritz
Université Grenoble Alpes, CNRS, IRD, IGE, 38000 Grenoble, France
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Our research introduces technology for exploring subglacial lakes while keeping them isolated from surface contamination. The RECoverable Autonomous Sonde (RECAS) can drill ice both downward and upward, allowing clean water sampling. In some cases, the sonde should drill at specific angles to follow a trajectory, maintain verticality, or bypass obstacles. This paper describes the general principles of steering the RECAS by adjusting the drill's heat distribution and the experimental results.
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G. D. Clow
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Y. Motizuki, Y. Nakai, K. Takahashi, M. Igarashi, H. Motoyama, and K. Suzuki
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Discipline: Ice sheets | Subject: Ice Physics
Evolution of crystallographic preferred orientations of ice sheared to high strains by equal-channel angular pressing
Anisotropic Scattering in Radio-Echo Sounding: Insights from Northeast Greenland
Failure strength of glacier ice inferred from Greenland crevasses
Grain growth of natural and synthetic ice at 0 °C
Ice fabrics in two-dimensional flows: beyond pure and simple shear
Modeling enhanced firn densification due to strain softening
Polarimetric radar reveals the spatial distribution of ice fabric at domes and divides in East Antarctica
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry
Observation of an optical anisotropy in the deep glacial ice at the geographic South Pole using a laser dust logger
Using a composite flow law to model deformation in the NEEM deep ice core, Greenland – Part 1: The role of grain size and grain size distribution on deformation of the upper 2207 m
Using a composite flow law to model deformation in the NEEM deep ice core, Greenland – Part 2: The role of grain size and premelting on ice deformation at high homologous temperature
The role of subtemperate slip in thermally driven ice stream margin migration
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Qinyu Wang, Sheng Fan, Daniel H. Richards, Rachel Worthington, David J. Prior, and Chao Qi
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Sheng Fan, David J. Prior, Brent Pooley, Hamish Bowman, Lucy Davidson, David Wallis, Sandra Piazolo, Chao Qi, David L. Goldsby, and Travis F. Hager
The Cryosphere, 17, 3443–3459, https://doi.org/10.5194/tc-17-3443-2023, https://doi.org/10.5194/tc-17-3443-2023, 2023
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Daniel H. Richards, Samuel S. Pegler, and Sandra Piazolo
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Understanding the orientation of ice grains is key for predicting ice flow. We explore the evolution of these orientations using a new efficient model. We present an exploration of the patterns produced under a range of temperatures and 2D deformations, including for the first time a universal regime diagram. We do this for deformations relevant to ice sheets but not studied in experiments. These results can be used to understand drilled ice cores and improve future modelling of ice sheets.
Falk M. Oraschewski and Aslak Grinsted
The Cryosphere, 16, 2683–2700, https://doi.org/10.5194/tc-16-2683-2022, https://doi.org/10.5194/tc-16-2683-2022, 2022
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M. Reza Ershadi, Reinhard Drews, Carlos Martín, Olaf Eisen, Catherine Ritz, Hugh Corr, Julia Christmann, Ole Zeising, Angelika Humbert, and Robert Mulvaney
The Cryosphere, 16, 1719–1739, https://doi.org/10.5194/tc-16-1719-2022, https://doi.org/10.5194/tc-16-1719-2022, 2022
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Radio waves transmitted through ice split up and inform us about the ice sheet interior and orientation of single ice crystals. This can be used to infer how ice flows and improve projections on how it will evolve in the future. Here we used an inverse approach and developed a new algorithm to infer ice properties from observed radar data. We applied this technique to the radar data obtained at two EPICA drilling sites, where ice cores were used to validate our results.
Maria Zeitz, Anders Levermann, and Ricarda Winkelmann
The Cryosphere, 14, 3537–3550, https://doi.org/10.5194/tc-14-3537-2020, https://doi.org/10.5194/tc-14-3537-2020, 2020
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The flow of ice drives mass losses in the large ice sheets. Sea-level rise projections rely on ice-sheet models, solving the physics of ice flow and melt. Unfortunately the parameters in the physics of flow are uncertain. Here we show, in an idealized setup, that these uncertainties can double flow-driven mass losses within the possible range of parameters. It is possible that this uncertainty carries over to realistic sea-level rise projections.
Martin Rongen, Ryan Carlton Bay, and Summer Blot
The Cryosphere, 14, 2537–2543, https://doi.org/10.5194/tc-14-2537-2020, https://doi.org/10.5194/tc-14-2537-2020, 2020
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We report on the observation of a directional anisotropy in the intensity of backscattered light. The measurement was performed using a laser dust logger in the SPC14 drill hole at the geographic South Pole. We find the anisotropy axis to be compatible with the ice flow direction. It is discussed in comparison to a similar anisotropy observed by the IceCube Neutrino Observatory. In future, the measurement principle may provide a continuous record of crystal properties along entire drill holes.
Ernst-Jan N. Kuiper, Ilka Weikusat, Johannes H. P. de Bresser, Daniela Jansen, Gill M. Pennock, and Martyn R. Drury
The Cryosphere, 14, 2429–2448, https://doi.org/10.5194/tc-14-2429-2020, https://doi.org/10.5194/tc-14-2429-2020, 2020
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A composite flow law model applied to crystal size distributions from the NEEM deep ice core predicts that fine-grained layers in ice from the last Glacial period localize deformation as internal shear zones in the Greenland ice sheet deforming by grain-size-sensitive creep. This prediction is consistent with microstructures in Glacial age ice.
Ernst-Jan N. Kuiper, Johannes H. P. de Bresser, Martyn R. Drury, Jan Eichler, Gill M. Pennock, and Ilka Weikusat
The Cryosphere, 14, 2449–2467, https://doi.org/10.5194/tc-14-2449-2020, https://doi.org/10.5194/tc-14-2449-2020, 2020
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Fast ice flow occurs in deeper parts of polar ice sheets, driven by high stress and high temperatures. Above 262 K ice flow is further enhanced, probably by the formation of thin melt layers between ice crystals. A model applying an experimentally derived composite flow law, using temperature and grain size values from the deepest 540 m of the NEEM ice core, predicts that flow in fine-grained layers is enhanced by a factor of 10 compared to coarse-grained layers in the Greenland ice sheet.
Marianne Haseloff, Christian Schoof, and Olivier Gagliardini
The Cryosphere, 12, 2545–2568, https://doi.org/10.5194/tc-12-2545-2018, https://doi.org/10.5194/tc-12-2545-2018, 2018
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The widths of the Siple Coast ice streams evolve on decadal to centennial timescales. We investigate how the rate of thermally driven ice stream widening depends on heat dissipation in the ice stream margin and at the bed, and on the inflow of cold ice from the ice ridge. As determining the migration rate requires resolving heat transfer processes on very small scales, we derive a parametrization of the migration rate in terms of parameters that are available from large-scale model outputs.
Johanna Kerch, Anja Diez, Ilka Weikusat, and Olaf Eisen
The Cryosphere, 12, 1715–1734, https://doi.org/10.5194/tc-12-1715-2018, https://doi.org/10.5194/tc-12-1715-2018, 2018
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We investigate the effect of crystal anisotropy on seismic velocities in glacier ice by calculating seismic phase velocities using the exact c axis angles to describe the crystal orientations in ice-core samples for an alpine and a polar ice core. Our results provide uncertainty estimates for earlier established approximative calculations. Additionally, our findings highlight the variation in seismic velocity at non-vertical incidence as a function of the horizontal azimuth of the seismic plane.
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