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
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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The concentration of sodium and sulphate measured in Antarctic ice cores is related to changes in both sea ice and winds. Here we have compiled a database of sodium and sulphate records from 105 ice core sites in Antarctica. The records span all, or part, of the past 2000 years. The records will improve our understanding of how winds and sea ice have changed in the past, and how they have influenced the climate of Antarctica over the past 2000 years.
Takashi Obase, Ayako Abe-Ouchi, Fuyuki Saito, Shun Tsutaki, Shuji Fujita, Kenji Kawamura, and Hideaki Motoyama
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We use a one-dimensional ice flow model to examine the most suitable core location near Dome Fuji (DF), Antarctica. This model computes the temporal evolutions of age and temperature from past to present. We investigate the influence of different parameters of climate and ice sheet on the ice's basal age, and compare the results with ground radar surveys. We find that the local ice thickness primarily controls the age because it is critical to the basal melting, which can eliminate the old ice.
William Colgan, Christopher Shields, Paval Talalay, Xiaopeng Fan, Austin P. Lines, Joshua Elliott, Harihar Rajaram, Kenneth Mankoff, Morten Jensen, Mira Backes, Yunchen Liu, Xianzhe Wei, Nanna B. Karlsson, Henrik Spanggård, and Allan Ø. Pedersen
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Gary D. Clow
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T. Kobashi, T. Ikeda-Fukazawa, M. Suwa, J. Schwander, T. Kameda, J. Lundin, A. Hori, H. Motoyama, M. Döring, and M. Leuenberger
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G. D. Clow
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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
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Daniel H. Richards, Samuel S. Pegler, and Sandra Piazolo
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Falk M. Oraschewski and Aslak Grinsted
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Old snow (denoted as firn) accumulates in the interior of ice sheets and gets densified into glacial ice. Typically, this densification is assumed to only depend on temperature and accumulation rate. However, it has been observed that stretching of the firn by horizontal flow also enhances this process. Here, we show how to include this effect in classical firn models. With the model we confirm that softening of the firn controls firn densification in areas with strong horizontal stretching.
M. Reza Ershadi, Reinhard Drews, Carlos Martín, Olaf Eisen, Catherine Ritz, Hugh Corr, Julia Christmann, Ole Zeising, Angelika Humbert, and Robert Mulvaney
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Maria Zeitz, Anders Levermann, and Ricarda Winkelmann
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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
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Ernst-Jan N. Kuiper, Ilka Weikusat, Johannes H. P. de Bresser, Daniela Jansen, Gill M. Pennock, and Martyn R. Drury
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