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  • Adolphi, FlorianLund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,University of Bern (author)

Connecting the Greenland ice-core and U/Th timescales via cosmogenic radionuclides : Testing the synchroneity of Dansgaard-Oeschger events

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-11-20
  • Copernicus GmbH,2018
  • 27 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:c0498044-e079-4eb2-9478-11e22b593c4a
  • https://lup.lub.lu.se/record/c0498044-e079-4eb2-9478-11e22b593c4aURI
  • https://doi.org/10.5194/cp-14-1755-2018DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • During the last glacial period Northern Hemisphere climate was characterized by extreme and abrupt climate changes, so-called Dansgaard-Oeschger (DO) events. Most clearly observed as temperature changes in Greenland ice-core records, their climatic imprint was geographically widespread. However, the temporal relation between DO events in Greenland and other regions is uncertain due to the chronological uncertainties of each archive, limiting our ability to test hypotheses of synchronous change. In contrast, the assumption of direct synchrony of climate changes forms the basis of many timescales. Here, we use cosmogenic radionuclides (10Be, 36Cl, 14C) to link Greenland ice-core records to U=Th-dated speleothems, quantify offsets between the two timescales, and improve their absolute dating back to 45 000 years ago. This approach allows us to test the assumption that DO events occurred synchronously between Greenland ice-core and tropical speleothem records with unprecedented precision. We find that the onset of DO events occurs within synchronization uncertainties in all investigated records. Importantly, we demonstrate that local discrepancies remain in the temporal development of rapid climate change for specific events and speleothems. These may either be related to the location of proxy records relative to the shifting atmospheric fronts or to underestimated U=Th dating uncertainties. Our study thus highlights the potential for misleading interpretations of the Earth system when applying the common practice of climate wiggle matching.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Bronk Ramsey, ChristopherUniversity of Oxford (author)
  • Erhardt, TobiasUniversity of Bern (author)
  • Lawrence Edwards, R.Xi'an Jiaotong University (author)
  • Cheng, HaiXi'an Jiaotong University,University of Minnesota (author)
  • Turney, Chris S.M.University of New South Wales (author)
  • Cooper, AlanUniversity of Adelaide (author)
  • Svensson, AndersUniversity of Copenhagen (author)
  • Rasmussen, Sune O.University of Copenhagen (author)
  • Fischer, HubertusUniversity of Bern (author)
  • 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 (author)
  • KvartärgeologiGeologiska institutionen (creator_code:org_t)

Related titles

  • In:Climate of the Past: Copernicus GmbH14:11, s. 1755-17811814-93241814-9332

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