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Correlation of Swedish glacial varves with the Greenland (GRIP) oxygen isotope record
Ansvarig organisation
1999 (Engelska)Ingår i: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 14, nr 4, s. 361-371Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A mean varve thickness curve has been constructed for a part of the Swedish varve chronology from the northwestern Baltic proper. The mean varve thickness curve has been correlated with the delta(18)O record from the GRIP ice-core using the Younger Dryas-Preboreal climate shift. This climate shift was defined by pollen analyses. The Scandinavian ice-sheet responded to a warming at the end of the Younger Dryas, ca. 10 995 to 10 700 clay-varve yr BP. Warming is recorded as a sequence of increasing mean varve thickness and ice-rafted debris suggesting intense calving of the ice front. The Younger Dryas-Preboreal climatic shift is dated to ca. 10 650 clay-varve yr BP, about 40 yr after the final drainage of the Baltic Ice Lake. Both the pollen spectra and a drastic increase in varve thickness reflect this climatic shift. A climate deterioration, correlated with the Preboreal oscillation, is dated to ca. 10 440 to 10 320 clay-varve yr BP and coincides with the brackish water phase of the Yoldia Sea stage. The ages of the climatic oscillations at the Younger Dryas-Preboreal transition show an 875 yr discrepancy compared with the GRIP record, suggesting a large error in the Swedish varve chronology in the part younger than ca. 10 300 clay-varve yr BP.

Ort, förlag, år, upplaga, sidor
1999. Vol. 14, nr 4, s. 361-371
Nyckelord [en]
Sweden, Baltic proper, clay-varve chronology, pollen analysis, GRIP ice-core, Younger Dryas, Preboreal oscillation
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:polar:diva-1875DOI: 10.1002/(SICI)1099-1417(199907)14:4<361::AID-JQS446>3.0.CO;2-ROAI: oai:DiVA.org:polar-1875DiVA, id: diva2:766194
Tillgänglig från: 2011-02-03 Skapad: 2014-11-26 Senast uppdaterad: 2017-12-05

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Andrén, Thomas
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