High-resolution analyses of an early Holocene climate event may imply decreased solar forcing as an important climate trigger

Svante Björck, Raimund Muscheler, Bernd Kromer, Camilla S. Andresen, Jan Heinemeier, Sigfus J. Johnsen, Daniel Conley, Nalan Koç, Marco Spurk, Siim Veski

Research output: Contribution to journalArticleResearchpeer-review

170 Citations (Scopus)

Abstract

Early Holocene lacustrine, tree-ring, ice-core, and marine records reveal that the Northern Hemisphere underwent a short cooling event at 10 300 calendar yr B.P. (9100 14C yr B.P.). The records were compared on a common high-resolution time scale and show that the event lasted less than 200 yr, with a cooling peak of 50 yr, and the event coincides with a distinct Holocene thermohaline disturbance recognized in the North Atlantic Ocean. In spite of well-known freshwater forcings at the time of the event, the negligible difference between the modeled Δ14C record, based on the GISP2 (Greenland Ice Sheet Project 2) 10Be data, and the measured values, does not allow for detectable Δ14C changes related to global ocean ventilation. We can, however, show that the onset of the cooling coincides with the onset of one of the largest Holocene 10Be flux peaks. This finding may imply that the climate system is more sensitive to solar-related changes than previously thought and that such changes may be an important underlying mechanism for sub-Milankovitch climate variability.

Original languageEnglish
Pages (from-to)1107-1110
Number of pages4
JournalGeology
Volume29
Issue number12
DOIs
Publication statusPublished - Dec 2001
Externally publishedYes

Keywords

  • ΔC
  • Be
  • C modeling
  • Holocene
  • Ice-core proxies
  • Lake sediments
  • Marine records
  • Solar forcing
  • Sub-Milankovitch cooling event
  • Tree rings

Programme Area

  • Programme Area 5: Nature and Climate

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