Synchronized terrestrial-atmospheric deglacial records around the North Atlantic

Svante Björck, Bernd Kromer, Sigfus Johnsen, Ole Bennike, Dan Hammarlund, Geoffrey Lemdahl, Göran Possnert, Tine Lander Rasmussen, Barbara Wohlfarth, Claus Uffe Hammer, Marco Spurk

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

491 Citationer (Scopus)

Abstrakt

On the basis of synchronization of three carbon-14 (14C)-dated lacustrine sequences from Sweden with tree ring and ice core records, the absolute age of the Younger Dryas-Preboreal climatic shift was determined to be 11,450 to 11,390 ± 80 years before the present. A 150-year-long cooling in the early Preboreal, associated with rising Δ14C values, is evident in all records and indicates an ocean ventilation change. This cooling is similar to earlier deglacial coolings, and box-model calculations suggest that they all may have been the result of increased freshwater forcing that inhibited the strength of the North Atlantic heat conveyor, although the Younger Dryas may have begun as an anomalous meltwater event.

OriginalsprogEngelsk
Sider (fra-til)1155-1160
Antal sider6
TidsskriftScience
Vol/bind274
Udgave nummer5290
DOI
StatusUdgivet - 15 nov. 1996

Programområde

  • Programområde 5: Natur og klima

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