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

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

169 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
Sider (fra-til)1107-1110
Antal sider4
TidsskriftGeology
Vol/bind29
Udgave nummer12
DOI
StatusUdgivet - dec. 2001
Udgivet eksterntJa

Programområde

  • Programområde 5: Natur og klima

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