Cited by 57Geology and Paleoclimatology ResearchCryospheric studies and observationsTree-ring climate responses

A multi-ice-core, annual-layer-counted Greenland ice-core chronology for the last 3800 years: GICC21

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Sinnl, Giulia, Winstrup, Mai, Erhardt, Tobias, Cook, Eliza, Jensen, Camilla Marie, Svensson, Anders, Vinther, Bo Møllesøe, Muscheler, Raimund +1 more·2022·Climate of the Past

Published version of a preprint

Abstract

Ice-core timescales are vital for the understanding of past climate; hence they should be updated whenever significant amounts of new data become available. Here, the Greenland ice-core chronology GICC05 was revised for the last 3835 years by synchronizing six deep ice cores and three shallow ice cores from the central Greenland ice sheet. A new method was applied by combining automated counting of annual layers on multiple parallel proxies and manual fine-tuning. A layer counting bias was found in all ice cores because of site-specific signal disturbances; therefore the manual comparison of all ice cores was deemed necessary to increase timescale accuracy. After examining sources of error and their correlation lengths, the uncertainty rate was quantified to be 1 year per century. The new timescale is younger than GICC05 by about 13 years at 3835 years ago. The most recent 800 years are largely unaffected by the revision. Between 800 and 2000 years ago, the offset between timescales increases steadily, with the steepest offset occurring between 800 and 1100 years ago. Moreover, offset oscillations of about 5 years around the average are observed between 2500 and 3800 years ago. The non-linear offset behavior is attributed to previous mismatches of volcanic eruptions, to the much more extensive dataset available to this study, and to the finer resolution of the new ice-core ammonium matching. By analysis of the common variations in cosmogenic radionuclides, the new ice-core timescale is found to be in alignment with the IntCal20 curve (Reimer et al., 2020).

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Crossref · 10.5194/cp-18-1125-2022

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  • The NS1-2011 and DRI_NGRIP2 chronologies are within errors consistent with the GICC21 chronology, but are more precise during the period 700-1000 CE because of additional age constraints.

    “Both chronologies are within errors consistent with the GICC21 chronology 107 , but are more precise during the period 700-1000 CE because of the additional age constraints.”

    From Decadal-to-centennial increases of volcanic aerosols from Iceland challenge the concept of a Medieval Quiet Period (2024) · cites this paper as [107]

    Section 4.2 (page unavailable) says NS1-2011 and DRI_NGRIP2 fall within GICC21’s uncertainties, supporting the agreement claim. Section 1.5 describes additional dated constraints for NS1-2011, but the cited paper does not establish that both chronologies are more precise than GICC21 during 700–1000 CE or that additional constraints make them so. (LLM, conf=0.86)

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Research works printed but not linked: 3

  1. Johnsen, S.: Stable isotope homogenization of polar firn and ice, in: Proc. of Symp. on Isotopes and Impurities in Snow and Ice, Int. Ass. of Hydrol. Sci., Commission of Snow and Ice, I.U.G.G. XVI, General Assembly, Grenoble, August–September 1975, IAHS-AISH Publ., 388–392, http://hydrologie.org/redbooks/a118/iahs_118_0210.pdf (last access: 19 April 2022), 1977.
  2. Muscheler, R.: 14C and 10Be around 1650 cal BC, in: Time’s Up! – Dating the Minoan Eruption of Santorini, Acts of the Minoan Eruption Chronology Workshop, Sandbjerg November 2007, edited by: Heinemeier, J. and Friedrich, W., Monographs of the Danish Institute at Athens, Bd. 10, Aarhus University Press, 275–284, ISBN 978-87-7934-024-4, 2009.
  3. Winstrup, M.: An automated method for annual layer counting in ice cores: and an application to visual stratigraphy data from the ngrip ice core, Doctoral dissertation, Københavns Universitet, Niels Bohr Institutet, 2011.

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Authors
Sinnl, G., Winstrup, M., Erhardt, T., Cook, E., Jensen, C. M., Svensson, A., Vinther, B. M., Muscheler, R., & Rasmussen, S. O.
Affiliations
  • University of Copenhagen (DK)
  • DTU Space (DK)
  • University of Bern (CH)
  • Lund University (SE)
Corresponding author
  • Winstrup, Mai
  • Erhardt, Tobias
  • Cook, Eliza
  • Jensen, Camilla Marie
  • Svensson, Anders
  • Muscheler, Raimund
  • Rasmussen, Sune Olander
Venue
Climate of the Past
Published
2022-05-24
Volume
18
Issue
5
Pages
1125-1150
ISSN
  • 1814-9324 (ISSN-L)
  • 1814-9332
OpenAlex
W4281400956
Cited by
50
References
124
Citations by year
2026: 4 · 2025: 5 · 2024: 11 · 2023: 16 · 2022: 5 · 2021: 9
FWCI
4.21
Type
journal article
Language
en
Open access
Locations
  • Climate of the past (publishedVersion, cc-by)
  • Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Lund University Publications (Lund University) (submittedVersion)
  • Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) (submittedVersion, cc-by)
Funders
  • Carlsbergfondet (ChronoClimate)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (20Fi21_164190)
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
annual layer counting, cosmogenic nuclides, IntCal20

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