A stacked mixing sequence at the base of the Dye 3 Core, Greenland

International audience This paper documents, by a detailed isotopic and gas composition study of the basal ice from the Dye 3 core, a large degree of flow‐induced mixing at the ice sheet base. This mixing results most probably from circular motion in troughs of bedrock undulations and flow separatio...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Souchez, R., Bouzette, A., Clausen, H., Johnsen, S., Jouzel, J.
Other Authors: Université libre de Bruxelles (ULB), Niels Bohr Institute Copenhagen (NBI), Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 1998
Subjects:
Online Access:https://hal.archives-ouvertes.fr/hal-03110386
https://hal.archives-ouvertes.fr/hal-03110386/document
https://hal.archives-ouvertes.fr/hal-03110386/file/98GL01411.pdf
https://doi.org/10.1029/98GL01411
Description
Summary:International audience This paper documents, by a detailed isotopic and gas composition study of the basal ice from the Dye 3 core, a large degree of flow‐induced mixing at the ice sheet base. This mixing results most probably from circular motion in troughs of bedrock undulations and flow separations with some entrainment of the underlying ice. The measured distribution of isotopes and gases in the basal ice is the consequence of successive mixing events having occurred upglacier from the site in an area of very rough bedrock topography. The deformation produced makes it possible for the basal part of the ice sheet to cross the subglacial valley existing in the Dye 3 area.