1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica
Frédéric Parrenin,Gabrielle Dreyfus,Geoffroy Durand,Geoffroy Durand,Shuji Fujita,Olivier Gagliardini,F. Gillet,Jean Jouzel,Kenji Kawamura,Nicolas Lhomme,Valérie Masson-Delmotte,Catherine Ritz,Jakob Schwander,Hitoshi Shoji,Ryu Uemura,Okitsugu Watanabe,Naohiro Yoshida +16 more
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One-dimensional (1-D) ice flow models are used to construct the age scales at the Dome C and Dome Fuji drilling sites (East Antarctica) as discussed by the authors, where poorly constrained glaciological parameters at each site are recovered by fitting independent age markers identified within each core.Abstract:
One-dimensional (1-D) ice flow models are used to construct the age scales at the Dome C and Dome Fuji drilling sites (East Antarctica) The poorly constrained glaciological parameters at each site are recovered by fitting independent age markers identified within each core We reconstruct past accumulation rates, that are larger than those modelled using the classical vapour saturation pressure relationship during glacial periods by up to a factor 15 During the Early Holocene, changes in reconstructed accumulation are not linearly related to changes in ice isotopic composition A simple model of past elevation changes is developed and shows an amplitude variation of 110–120 m at both sites We suggest that there is basal melting at Dome C (056±019 mm/yr) The reconstructed velocity profile is highly non-linear at both sites, which suggests complex ice flow effects This induces a non-linear thinning function in both drilling sites, which is also characterized by bumps corresponding to variations in ice thickness with timeread more
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Orbital and Millennial Antarctic Climate Variability over the Past 800,000 Years
Jean Jouzel,Valérie Masson-Delmotte,O. Cattani,Gabrielle Dreyfus,S. Falourd,G. P. Hoffmann,Bénédicte Minster,Julius Nouet,Jean-Marc Barnola,Jérôme Chappellaz,Hubertus Fischer,J. C. Gallet,Sigfus J Johnsen,Sigfus J Johnsen,Markus Leuenberger,L. Loulergue,D. Luethi,Hans Oerter,Frédéric Parrenin,Grant M. Raisbeck,Dominique Raynaud,Adrian Schilt,Jakob Schwander,Enricomaria Selmo,Roland Souchez,Renato Spahni,Bernhard Stauffer,Jørgen Peder Steffensen,Barbara Stenni,Thomas F. Stocker,Jean-Louis Tison,Martin Werner,Eric W. Wolff +32 more
TL;DR: It is suggested that the interplay between obliquity and precession accounts for the variable intensity of interglacial periods in ice core records.
Orbital and millenial antarctic climate variability over the last 800 000 years
Jean Jouzel,Jean-Louis Tison +1 more
TL;DR: A high-resolution deuterium profile is available along the entire European Project for Ice Coring in Antarctica Dome C ice core, extending this climate record back to marine isotope stage 20.2, ∼800,000 years ago.
Journal ArticleDOI
A reconciled estimate of ice-sheet mass balance
Andrew Shepherd,Erik R. Ivins,Geruo A,Valentina R. Barletta,Michael J. Bentley,Srinivas Bettadpur,Kate Briggs,David H. Bromwich,René Forsberg,Natalia Galin,Martin Horwath,S. S. Jacobs,Ian Joughin,Matt A. King,Matt A. King,Jan T. M. Lenaerts,Jilu Li,Stefan R. M. Ligtenberg,Adrian Luckman,Scott B. Luthcke,Malcolm McMillan,Rakia Meister,Glenn A. Milne,Jeremie Mouginot,Alan Muir,Julien P. Nicolas,John Paden,Antony J. Payne,Hamish D. Pritchard,Eric Rignot,Eric Rignot,Helmut Rott,Louise Sandberg Sørensen,Ted Scambos,Bernd Scheuchl,Ernst Schrama,Ben Smith,Aud Venke Sundal,Jan H. van Angelen,Willem Jan van de Berg,Michiel R. van den Broeke,David G. Vaughan,Isabella Velicogna,Isabella Velicogna,John Wahr,Pippa L. Whitehouse,Duncan J. Wingham,Donghui Yi,Duncan A. Young,H. Jay Zwally +49 more
TL;DR: There is good agreement between different satellite methods—especially in Greenland and West Antarctica—and that combining satellite data sets leads to greater certainty, and the mass balance of Earth’s polar ice sheets is estimated by combining the results of existing independent techniques.
Supplementary Materials for A Reconciled Estimate of Ice-Sheet Mass Balance
Andrew Shepherd,Erik R. Ivins,Geruo A,Valentina R. Barletta,Michael J. Bentley,Srinivas Bettadpur,Kate Briggs,David H. Bromwich,René Forsberg,Natalia Galin,Martin Horwath,Stan Jacobs,Ian Joughin,Matt A. King,Jan T. M. Lenaerts,Jilu Li,Stefan R. M. Ligtenberg,Adrian Luckman,Scott B. Luthcke,Malcolm McMillan,Glenn A. Milne,Jeremie Mouginot,Alan Muir,Julien Nicolas,John Paden,A. J. Payne,Hamish D. Pritchard,Eric Rignot,Helmut Rott,Ted Scambos,Bernd Scheuchl,Ernst Schrama,Ben Smith,Jan H. van Angelen,Willem Jan van de Berg,Michiel van den Broeke,Isabella Velicogna,John Wahr,Pippa L. Whitehouse,Duncan J. Wingham,Donghui Yi,Duncan Young,H. Jay Zwally +42 more
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Target atmospheric CO2: Where should humanity aim?
James Hansen,Makiko Sato,Pushker Kharecha,David J. Beerling,Robert A. Berner,Valérie Masson-Delmotte,Mark Pagani,Maureen E. Raymo,Dana L. Royer,James C Zachos +9 more
TL;DR: In this paper, the authors show that the current CO2 level can be reduced to at most 350 ppm by phasing out coal use except where CO2 is captured and adopting agricultural and forestry practices that sequester carbon.
References
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A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records
TL;DR: In this paper, a 53-Myr stack (LR04) of benthic δ18O records from 57 globally distributed sites aligned by an automated graphic correlation algorithm is presented.
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Eight glacial cycles from an Antarctic ice core
Laurent Augustin,Carlo Barbante,Piers R. F. Barnes,J. M. Barnola,Matthias Bigler,Emiliano Castellano,Olivier Cattani,Jérôme Chappellaz,Dorthe Dahl-Jensen,Barbara Delmonte,Gabrielle Dreyfus,Gaël Durand,S. Falourd,Hubertus Fischer,Jacqueline Flückiger,Margareta Hansson,Philippe Huybrechts,Gérard Jugie,Sigfus J Johnsen,Jean Jouzel,Patrik R Kaufmann,Josef Kipfstuhl,Fabrice Lambert,Vladimir Ya. Lipenkov,Geneviève C Littot,Antonio Longinelli,Reginald Lorrain,Valter Maggi,Valérie Masson-Delmotte,Heinz Miller,Robert Mulvaney,Johannes Oerlemans,Hans Oerter,Giuseppe Orombelli,Frédéric Parrenin,David A. Peel,J. R. Petit,Dominique Raynaud,Catherine Ritz,Urs Ruth,Jakob Schwander,Urs Siegenthaler,Roland Souchez,Bernhard Stauffer,Jørgen Peder Steffensen,Barbara Stenni,Thomas F. Stocker,Ignazio Tabacco,Roberto Udisti,Roderik S. W. van de Wal,Michiel R. van den Broeke,Jérôme Weiss,Frank Wilhelms,Jan-Gunnar Winther,Eric W. Wolff,Mario Zucchelli +55 more
TL;DR: The recovery of a deep ice core from Dome C, Antarctica, that provides a climate record for the past 740,000 years is reported, suggesting that without human intervention, a climate similar to the present one would extend well into the future.
Journal ArticleDOI
A new Greenland ice core chronology for the last glacial termination
Sune Olander Rasmussen,Katrine Krogh Andersen,Anders Svensson,Jørgen Peder Steffensen,Bo Møllesøe Vinther,Henrik Clausen,Marie-Louise Siggaard-Andersen,Marie-Louise Siggaard-Andersen,Sigfus J Johnsen,L. B. Larsen,Dorthe Dahl-Jensen,M. Bigler,M. Bigler,Regine Röthlisberger,Regine Röthlisberger,Hubertus Fischer,Kumiko Goto-Azuma,Margareta Hansson,Urs Ruth +18 more
TL;DR: In this paper, a new common stratigraphic timescale for the North Greenland Ice Core Project (NGRIP) and GRIP ice cores is presented, which covers the period 7.9-14.8 kyr before present and includes the Bolling, Allerod, Younger Dryas, and early Holocene periods.
Journal ArticleDOI
Timing of Millennial-Scale Climate Change in Antarctica and Greenland During the Last Glacial Period
Thomas Blunier,Edward J. Brook +1 more
TL;DR: A precise relative chronology for Greenland and West Antarctic paleotemperature is extended to 90,000 years ago, based on correlation of atmospheric methane records from the Greenland Ice Sheet Project 2 and Byrd ice cores, to provide further evidence for the operation of a "bipolar see-saw" in air temperatures and an oceanic teleconnection between the hemispheres on millennial time scales.
Journal ArticleDOI
Oxygen isotope and palaeotemperature records from six Greenland ice‐core stations: Camp Century, Dye‐3, GRIP, GISP2, Renland and NorthGRIP
Sigfus J Johnsen,Sigfus J Johnsen,Dorthe Dahl-Jensen,Niels S. Gundestrup,Jørgen Peder Steffensen,Henrik Clausen,Heinz Miller,Valérie Masson-Delmotte,Arny E. Sveinbjörnsdottir,James W. C. White +9 more
TL;DR: In this article, a new record of Holocene isotope variations obtained from the NorthGRIP ice-core matches the GRIP short-term isotope record, and also shows similar long-term trends to the Dye-3 and GRIP inverted temperature data.
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