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

This paper provides the first chronology for the deep ice core from the East Greenland Ice-core Project (EGRIP) over the Holocene and the late last glacial period. We rely mainly on volcanic events and common peak patterns recorded by dielectric profiling (DEP) and electrical conductivity measuremen...

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Bibliographic Details
Published in:Climate of the Past
Main Authors: Mojtabavi, F., Cook, E., Davies, S.M., Sinnl, G., Skov Jensen, M., Dahl-Jensen, D., Svensson, A., Vinther, B.M., Kipfstuhl, S., Jones, G., Karlsson, N.B., Henrique Faria, S., Gkinis, V., Astrid Kjær, H., Erhardt, T., Berben, S.M.P., Nisancioglu, K.H., Koldtoft, I., Olander Rasmussen, S.
Format: Article in Journal/Newspaper
Language:English
Published: Climate of the Past 2020
Subjects:
chronology
data set
Eemian
electrical conductivity
GRIP
Holocene
ice core
ice flow
Last Glacial
model validation
paleoclimate
proxy climate record
reconstruction
tephra
Arctic
East Greenland
Greenland
Bergen
Paul-Emile Victor
Alfred Wegener Institute
East Greenland Ice-core Project
Greenland ice core
Greenland Ice core Project
National Institute of Polar Research
National Science Foundation Office of Polar Programs
NGRIP
North Greenland
North Greenland Ice Core Project
Online Access:http://hdl.handle.net/10810/51914
https://doi.org/10.5194/cp-16-2359-2020
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Summary:This paper provides the first chronology for the deep ice core from the East Greenland Ice-core Project (EGRIP) over the Holocene and the late last glacial period. We rely mainly on volcanic events and common peak patterns recorded by dielectric profiling (DEP) and electrical conductivity measurement (ECM) for the synchronization between the EGRIP, North Greenland Eemian Ice Drilling (NEEM) and North Greenland Ice Core Project (NGRIP) ice cores in Greenland. We transfer the annual-layer-counted Greenland Ice Core Chronology 2005 (GICC05) from the NGRIP core to the EGRIP ice core by means of 381 match points, typically spaced less than 50 years apart. The NEEM ice core has previously been dated in a similar way and is only included to support the match-point identification. We name our EGRIP timescale GICC05-EGRIP-1. Over the uppermost 1383.84 m, we establish a depth-Age relationship dating back to 14 967 years b2k (years before the year 2000 CE). Tephra horizons provide an independent validation of our match points. In addition, we compare the ratio of the annual layer thickness between ice cores in between the match points to assess our results in view of the different iceflow patterns and accumulation regimes of the different periods and geographical regions. For the next years, this initial timescale will be the basis for climatic reconstructions from EGRIP high-resolution proxy data sets, e.g. stable water isotopes, chemical impurity or dust records. © 2020 BioMed Central Ltd. All rights reserved. This research has been supported by the A. P. Møller Foundation, University of Copenhagen; US National Science Foundation, Office of Polar Programs; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research; National Institute of Polar Research and Arctic Challenge for Sustainability, Japan; University of Bergen and Bergen Research Foundation; Swiss National Science Foundation (SNFS); French Polar Institute Paul-Emile Victor, Institute for Geosciences and Environmental research; Chinese Academy of ...

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