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The Preboreal climate reversal and a subsequent solar-forced climate shift

Author:
  • J Van der Plicht
  • B Van Geel
  • SJP Bohncke
  • JAA Bos
  • M Blaauw
  • AOM Speranza
  • Raimund Muscheler
  • Svante Björck
Publishing year: 2004
Language: English
Pages: 263-269
Publication/Series: Journal of Quaternary Science
Volume: 19
Issue: 3
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

Accurate chronologies are essential for linking palaeoclimate archives. Carbon-14 wiggle-match dating was used to produce an accurate chronology for part of an early Holocene peat sequence from the Borchert (The Netherlands). Following the Younger Dryas-Preboreal transition, two climatic shifts could be inferred. Around 11 400 cal. yr BP the expansion of birch (Betula) forest was interrupted by a dry continental phase with dominantly open grassland vegetation, coeval with the PBO (Preboreal Oscillation), as observed in the GRIP ice core. At 11 250 cal. yr BP a sudden shift to a humid climate occurred. This second change appears to be contemporaneous with: (i) a sharp increase of atmospheric C-14; (ii) a temporary decline of atmospheric CO2; and (iii) an increase in the GRIP Be-10 flux. The close correspondence with excursions of cosmogenic nuclides points to a decline in solar activity, which may have forced the changes in climate and vegetation at around 11 250 cal. yr BP. Copyright (C) 2004 John Wiley Sons, Ltd.

Keywords

  • Geology
  • wiggle-match dating
  • peat
  • climate change
  • Preboreal
  • solar forcing
  • C-14
  • Be-10
  • O-18

Other

Published
  • ISSN: 1099-1417
Raimund Muscheler
E-mail: raimund.muscheler [at] geol.lu.se

Professor

Quaternary Sciences

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