Journal ArticleDOI
High geothermal heat flow, Basal melt, and the origin of rapid ice flow in central Greenland.
TLDR
Age-depth relations from internal layering reveal a large region of rapid basal melting in Greenland, where the southern limit of melt coincides with magnetic anomalies and topography that suggest a volcanic origin.Abstract:
Age-depth relations from internal layering reveal a large region of rapid basal melting in Greenland. Melt is localized at the onset of rapid ice flow in the large ice stream that drains north off the summit dome and other areas in the northeast quadrant of the ice sheet. Locally, high melt rates indicate geothermal fluxes 15 to 30 times continental background. The southern limit of melt coincides with magnetic anomalies and topography that suggest a volcanic origin.read more
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High-resolution record of Northern Hemisphere climate extending into the last interglacial period.
Katrine Krogh Andersen,Nobuhiko Azuma,Jean-Marc Barnola,M. Bigler,Pierre E. Biscaye,Nicolas Caillon,Jérôme Chappellaz,H. B. Clausen,Dorthe Dahl-Jensen,Hubertus Fischer,Jacqueline Flückiger,Diedrich Fritzsche,Yoshiyuki Fujii,Kumiko Goto-Azuma,Karl Grönvold,Niels S. Gundestrup,Margareta Hansson,Christof Huber,Christine S. Hvidberg,Sigfus J Johnsen,Ulf Jonsell,Jean Jouzel,S. Kipfstuhl,Amaelle Landais,Markus Leuenberger,Regi D. Lorrain,Valérie Masson-Delmotte,Heinrich Miller,Hideaki Motoyama,Hideki Narita,Trevor Popp,Sune Olander Rasmussen,Dominique Raynaud,R. Röthlisberger,U. Ruth,Denis Samyn,Jakob Schwander,Hitoshi Shoji,M. L. Siggard-Andersen,Jørgen Peder Steffensen,Thomas F. Stocker,A. E. Sveinbjörnsdottir,Anders Svensson,Morimasa Takata,Jean-Louis Tison,T. Thorsteinsson,Okitsugu Watanabe,Frank Wilhelms,James W. C. White +48 more
TL;DR: An undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period, shows a slow decline in temperatures that marked the initiation of the last glacial period.
Journal ArticleDOI
A new bed elevation dataset for Greenland
Jonathan L. Bamber,J. A. Griggs,R. T. W. L. Hurkmans,Julian A. Dowdeswell,Sivaprasad Gogineni,Ian M. Howat,Jeremie Mouginot,John Paden,S. J. Palmer,Eric Rignot,Eric Rignot,Daniel Steinhage +11 more
TL;DR: In this paper, a new bed elevation dataset for Greenland derived from a combination of multiple airborne ice thickness surveys undertaken between the 1970s and 2012 is presented, with roughly 70% of this having been collected since the year 2000, when the last comprehensive compilation was undertaken.
Journal ArticleDOI
Oceans on Mars: An assessment of the observational evidence and possible fate
Michael H. Carr,James W. Head +1 more
TL;DR: The Vastitas Borealis Formation (VBF) as mentioned in this paper is interpreted as a sublimation residue from the ponded outflow channel effluents, which is a thin veneer of material of Upper Hesperian age.
Journal ArticleDOI
Heat flux anomalies in Antarctica revealed by satellite magnetic data.
TL;DR: It is found that the heat flux underneath the ice sheet varies from 40 to 185 megawatts per square meter and that areas of high heat flux coincide with known current volcanism and some areas known to have ice streams.
Oceans on Mars: An Assessment of the Observational Evidence and Possible Fate
Michael H. Carr,James W. Head +1 more
TL;DR: The Vastitas Borealis Formation (VBF) as mentioned in this paper is interpreted as a sublimation residue from the ponded outflow channel effluents, which is a thin veneer of material of Upper Hesperian age.
References
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Journal ArticleDOI
The heat flow through oceanic and continental crust and the heat loss of the Earth
TL;DR: In this paper, the authors used radiometric dates to estimate the amount of heat lost by the earth during the last orogenic event, the distribution of heat-producing elements, and erosion.
Journal ArticleDOI
The Greenland Ice Sheet Project 2 depth-age scale : Methods and results
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TL;DR: The Greenland Ice Sheet Project 2 (GISP2) depth-age scale is presented based on a multiparameter continuous count approach to a depth of 2800 m, using a systematic combination of parameters that have never been used to this extent before as mentioned in this paper.
Journal ArticleDOI
Temperature, accumulation, and ice sheet elevation in central Greenland through the last deglacial transition
Kurt M. Cuffey,Gary D. Clow +1 more
TL;DR: In this article, a combined heat-and ice-flow model is presented, constrained by measurements of temperature in the Greenland Ice Sheet Project 2 (GISP2) borehole and by the depth-age scale.
Journal ArticleDOI
The δ18O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability
S. Johnsen,Henrik Clausen,Willi Dansgaard,Niels S. Gundestrup,Claus U. Hammer,Uffe Strandby Andersen,Katrine Krogh Andersen,Christine S. Hvidberg,Dorthe Dahl-Jensen,Jørgen Peder Steffensen,Hitoshi Shoji,Arny E. Sveinbjörnsdottir,Jim White,Jean Jouzel,David A. Fisher +14 more
TL;DR: In this paper, a detailed and continuous δ8O profile has been obtained and is discussed in terms of past temperatures in Greenland, and a three-core stacked annual δ 8O profile for the past 917 years has been discussed.
Journal ArticleDOI
The Distribution of Stress and Velocity in Glaciers and Ice-Sheets
TL;DR: In this article, a general flow law is used throughout, and the equations for steady flow, with r allowed to be non-zero, are found, with different variations of density, temperature or flow law with depth.