A synchronized dating of three Greenland ice cores throughout the Holocene
Open accessAbstract
As part of the effort to create the new Greenland Ice Core Chronology 2005 (GICC05) a synchronized stratigraphical timescale for the Holocene parts of the DYE‐3, Greenland Ice Core Project (GRIP), and North Greenland Ice Core Project (NGRIP) ice cores is made by using volcanic reference horizons in electrical conductivity measurements to match the cores. The main annual layer counting is carried out on the most suited records only, exploiting that the three ice cores have been drilled at locations with different climatic conditions and differences in ice flow. However, supplemental counting on data from all cores has been performed between each set of reference horizons in order to verify the validity of the match. After the verification, the main dating is transferred to all records using the volcanic reference horizons as tie points. An assessment of the mean annual layer thickness in each core section confirms that the new synchronized dating is consistent for all three cores. The data used for the main annual layer counting of the past 7900 years are the DYE‐3, GRIP, and NGRIP stable isotope records. As the high accumulation rate at the DYE‐3 drill site makes the seasonal cycle in the DYE‐3 stable isotopes very resistant to firn diffusion, an effort has been made to extend the DYE‐3 Holocene record. The new synchronized dating relies heavily on this record of ∼75,000 stable isotope samples. The dating of the early Holocene consists of an already established part of GICC05 for GRIP and NGRIP which has now been transferred to the DYE‐3 core. GICC05 dates the Younger Dryas termination, as defined from deuterium excess, to 11,703 years before A. D. 2000 (b2k), 130 years earlier than the previous GRIP dating.
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Greenland ice cores show abrupt, brief cooling events at 11,400, 9,300 and 8,200 B.P., expressed as decreases in δ18O values.
“Greenland ice cores show abrupt, brief cooling events, expressed as decreases in δ 18 O values, at 11,400, 9,300 and 8,200 B.P. ( 77 ; Fig. 6A)”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [77]
The Results (§5, ¶39) identify events at 11.4, 9.3 and 8.2 ka as significant deviations in three Greenland ice-core δ18O records; §2.1 calls the 8.2 ka event a cold event. The text does not specify that δ18O decreased at all three events or describe all three as abrupt and brief. (LLM, conf=0.84)
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Research works printed but not linked: 4
- D13102 21562202d, 2006, D13, · DOI
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- Authors
- Vinther, B. M., Clausen, H. B., Johnsen, S. J., Rasmussen, S. O., Andersen, K. K., Buchardt, S. L., Dahl‐Jensen, D., Seierstad, I. K., Siggaard‐Andersen, M. ‐., Steffensen, J. P., Svensson, A., Olsen, J., & Heinemeier, J.
- Affiliations
- University of Copenhagen (DK)
- Aarhus University (DK)
- Corresponding author
- Vinther, B. M.
- ORCID
- Venue
- Journal of Geophysical Research: Atmospheres
- Publisher
- American Geophysical Union (AGU)
- Published
- 2006-07-04
- Volume
- 111
- Issue
- D13
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W2108952763
- Cited by
- 670
- References
- 25
- Citations by year
- 2026: 10 · 2025: 25 · 2024: 22 · 2023: 46 · 2022: 54 · 2021: 47 · 2020: 34 · 2019: 30 · 2018: 28 · 2017: 24 · 2016: 37 · 2015: 37 · 2014: 55 · 2013: 30 · 2012: 38
- FWCI
- 20.40
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Geophysical Research Atmospheres (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
- Funders
- University of East Anglia
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Cryospheric studies and observations
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Tree-ring climate responses
- Keywords
- Holocene, ice core chronology, GICC05, Dye 3 ice core, GRIP ice core, NGRIP ice core, electrical conductivity, annual layer counting, stable isotopes, deuterium excess, Greenland ice sheet, ice flow
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