A first chronology for the East Greenland Ice-core Project (EGRIP) over the Holocene and last glacial termination
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Published:2020-11-27
Issue:6
Volume:16
Page:2359-2380
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Mojtabavi SeyedhamidrezaORCID, Wilhelms FrankORCID, Cook ElizaORCID, Davies Siwan M., Sinnl Giulia, Skov Jensen Mathias, Dahl-Jensen Dorthe, Svensson AndersORCID, Vinther Bo M., Kipfstuhl Sepp, Jones Gwydion, Karlsson Nanna B.ORCID, Faria Sergio Henrique, Gkinis VasileiosORCID, Kjær Helle AstridORCID, Erhardt TobiasORCID, Berben Sarah M. P., Nisancioglu Kerim H.ORCID, Koldtoft IbenORCID, Rasmussen Sune OlanderORCID
Abstract
Abstract. 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 ice-flow 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.
Funder
Københavns Universitet National Science Foundation Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research National Institute of Polar Research Universitetet i Bergen Bergens Forskningsstiftelse Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung Institut Polaire Français Paul Emile Victor Beijing Normal University Carlsbergfondet Ministerio de Ciencia e Innovación
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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