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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2019-143
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-143
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Dec 2019

Submitted as: research article | 05 Dec 2019

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This preprint is currently under review for the journal CP.

A first chronology for the East GReenland Ice–core Project (EGRIP) over the Holocene and last glacial termination

Seyedhamidreza Mojtabavi1,2, Frank Wilhelms1,2, Eliza Cook3, Siwan Davies4, Giulia Sinnl3, Mathias Skov Jensen3, Dorthe Dahl-Jensen3, Anders Svensson3, Bo Vinther3, Sepp Kipfstuhl1,3, Gwydion Jones4, Nanna B. Karlsson1,5, Sergio Henrique Faria6,7,8, Vasileios Gkinis3, Helle Kjær3, Tobias Erhardt9, Sarah M. P. Berben10, Kerim H. Nisancioglu10,11, Iben Koldtoft3, and Sune Olander Rasmussen3 Seyedhamidreza Mojtabavi et al.
  • 1Alfred–Wegener–Institut Helmholtz–Zentrum für Polar– und Meeresforschung, Bremerhaven, Germany
  • 2Department of Crystallography, Geoscience Centre, University of Göttingen, 37073 Göttingen, Germany
  • 3Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Denmark
  • 4Department of Geography, College of Science, Swansea University, Swansea, Wales, UK
  • 5Geological Survey of Denmark and Greenland, Copenhagen, Denmark
  • 6Basque Centre for Climate Change (BC3), 48940 Leioa, Spain
  • 7Nagaoka University of Technology, 940-2188 Nagaoka, Japan
  • 8IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
  • 9Climate and Environmental Physics, Physics Institute and Oeschger Center for Climate Change Research, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
  • 10Department of Earth Science, University of Bergen, Bjerknes Centre for Climate Research, Allégaten 41, 5007, Bergen, Norway
  • 11Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway

Abstract. This paper provides the first chronology for the deep ice core from the East GReenland Ice-core Project (EGRIP) over the Holocene and late last glacial period. We rely mainly on volcanic events and common patterns of peaks in dielectric profiling (DEP), electrical conductivity measurements (ECM) and tephra records for the synchronization between the EGRIP, NEEM and NGRIP ice cores in Greenland. We transfer the annual-layer-counted Greenland Ice Core Chronology 2005 (GICC05) timescale from the NGRIP core to the EGRIP ice core by means of 373 match points. The NEEM ice core is only used for supporting match-point identification. We name our EGRIP time scale GICC05-EGRIP-1. Over the uppermost 1383.84 m, we establish a depth–age relationship dating back to 14,965 a b2k (years before the year 2000 CE). Tephra horizons provide an independent validation of our match points. In addition, we compare the ratio of annual layer thicknesses between ice cores in-between the match points to assess our results in view of the different ice-flow patterns and accumulation regimes of the different periods and geographical regions. This initial timescale is the basis of interpretation and refinement of the presently derived EGRIP high-resolution data sets of chemical impurities.

Seyedhamidreza Mojtabavi et al.

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Seyedhamidreza Mojtabavi et al.

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