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Raimund Muscheler

Raimund Muscheler

Professor

Raimund Muscheler

High-precision dating and correlation of ice, marine and terrestrial sequences spanning Heinrich Event 3 : Testing mechanisms of interhemispheric change using New Zealand ancient kauri (Agathis australis)

Författare

  • Chris S M Turney
  • Jonathan Palmer
  • Christopher Bronk Ramsey
  • Florian Adolphi
  • Raimund Muscheler
  • Konrad A. Hughen
  • Richard A. Staff
  • Richard T. Jones
  • Zoë A. Thomas
  • Christopher J. Fogwill
  • Alan Hogg
Visa allt

Summary, in English

Robustly testing hypotheses of geographic synchroneity of abrupt and extreme change during the late Pleistocene (60,000 to 11,650 years ago) requires a level of chronological precision often lacking in ice, marine and terrestrial sequences. Here we report a bidecadally-resolved New Zealand kauri (Agathis australis) tree-ring sequence spanning two millennia that preserves a record of atmospheric radiocarbon (14C) during ice-rafted debris event Heinrich Event 3 (HE3) in the North Atlantic and Antarctic Isotope Maximum 4 (AIM4) in the Southern Hemisphere. Using 14C in the marine Cariaco Basin and 10Be preserved in Greenland ice, the kauri 14C sequence allows us to precisely align sequences across this period. We observe no significant difference between atmospheric and marine 14C records during HE3, suggesting no stratification of surface waters and collapse in Atlantic Meridional Overturning Circulation (AMOC). Instead our results support recent evidence for a weakened AMOC across at least two millennia of the glacial period. Our work adds to a growing body of literature confirming that Heinrich events are not the cause of stadial cooling and suggests changes in the AMOC were not the primary driver of antiphase temperature trends between the hemispheres. Decadally-resolved 14C in ancient kauri offers a powerful new (and complementary) approach to polar ice core CH4 alignment for testing hypotheses of abrupt and extreme climate change.

Avdelning/ar

  • Kvartärgeologi
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2016-04-01

Språk

Engelska

Sidor

126-134

Publikation/Tidskrift/Serie

Quaternary Science Reviews

Volym

137

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Nyckelord

  • Abrupt climate change
  • Antarctic Isotope Maximum-4 (AIM4)
  • Atmospheric radiocarbon (C)
  • Bipolar seesaw
  • Extreme events
  • Heinrich-3 (H3)
  • Tree-ring

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0277-3791