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A multi-ice-core, a...
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Sinnl, GiuliaNiels Bohr Institute
(författare)
A multi-ice-core, annual-layer-counted Greenland ice-core chronology for the last 3800 years : GICC21
- Artikel/kapitelEngelska2022
Förlag, utgivningsår, omfång ...
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2022-05-24
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Copernicus GmbH,2022
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26 s.
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LIBRIS-ID:oai:lup.lub.lu.se:93382c79-e637-4247-9f9c-0d7143eadda3
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https://lup.lub.lu.se/record/93382c79-e637-4247-9f9c-0d7143eadda3URI
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https://doi.org/10.5194/cp-18-1125-2022DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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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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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Winstrup, MaiTechnical University of Denmark
(författare)
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Erhardt, TobiasAlfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven,University of Bern
(författare)
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Cook, ElizaNiels Bohr Institute
(författare)
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Jensen, Camilla MarieUniversity of Bern
(författare)
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Svensson, AndersNiels Bohr Institute
(författare)
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Vinther, Bo MøllesøeNiels Bohr Institute
(författare)
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Muscheler, RaimundLund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology(Swepub:lu)geol-rmu
(författare)
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Rasmussen, Sune OlanderNiels Bohr Institute
(författare)
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Niels Bohr InstituteTechnical University of Denmark
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Climate of the Past: Copernicus GmbH18:5, s. 1125-11501814-93241814-9332
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