期刊
CLIMATE OF THE PAST
卷 16, 期 6, 页码 2359-2380出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/cp-16-2359-2020
关键词
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资金
- A. P. Moller Foundation
- University of Copenhagen
- US National Science Foundation, Office of Polar Programs
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research
- Swiss National Science Foundation (SNFS)
- University of Bergen
- Bergen Research Foundation
- French Polar Institute Paul-Emile Victor
- Institute for Geosciences and Environmental research
- Chinese Academy of Sciences
- Beijing Normal University
- Carlsberg Foundation (project ChronoClimate)
- Spanish Ministry of Science, Innovation, the Spanish Government through the Maria de Maeztu excellence accreditation 2018-2022 [MDM-2017-0714]
- Basque Government (BERC 2018-2021 programme)
- Oeschger Center for Climate Change Research
- National Institute of Polar Research, Japan
- Arctic Challenge for Sustainability, Japan
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.
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