Timing of the first drainage of the Baltic Ice Lake synchronous with the onset of Greenland Stadial 1

Muschitiello, F., Lea, J. M., Greenwood, S. L., Nick, F. M., Brunnberg, L., MacLeod, A. and Wohlfarth, B. (2016) Timing of the first drainage of the Baltic Ice Lake synchronous with the onset of Greenland Stadial 1. Boreas, 45 (2). pp. 322-334. ISSN 0300-9483 doi: 10.1111/bor.12155

Abstract/Summary

Glacial varves can give significant insights into recession and melting rates of decaying ice sheets. Moreover, varve chronologies can provide an independent means of comparison to other annually resolved climatic archives, which ultimately help to assess the timing and response of an ice sheet to changes across rapid climate transitions. Here we report a composite 1257-year long varve chronology from south-eastern Sweden spanning the regional late Allerød-late Younger Dryas pollen zone. The chronology was correlated to the Greenland Ice Core Chronology 2005 using the time-synchronous Vedde Ash volcanic marker, which can be found in both successions. For the first time, this enables secure placement of the Lateglacial Swedish varve chronology in absolute time. Geochemical analysis from new varve successions indicate a marked change in sedimentation regime accompanied by an interruption of ice-rafted debris deposition synchronous with the onset of Greenland Stadial 1 (GS-1; 12 846 years before 1950 AD). With the support of a simple ice flow/calving model, we suggest that slowdown of sediment transfer can be explained by ice-sheet margin stabilisation/advance in response to a significant drop of the Baltic Ice Lake level. A reassessment of chronological evidence from central-western and southern Sweden further supports the hypothesis of synchronicity between the first (penultimate) catastrophic drainage of the Baltic Ice Lake and the start of GS-1 in Greenland ice cores. Our results may therefore provide the first chronologically robust evidence linking continental meltwater forcing to rapid atmosphere-ocean circulation changes in the North Atlantic.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/77198
Identification Number/DOI	10.1111/bor.12155
Refereed	Yes
Divisions	No Reading authors. Back catalogue items Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Publisher	Wiley
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