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

• DOI: 10.1111/bor.12155
• Publication Date: 2015-12-15T05:41:58Z
• Authors: Francesco Muschit...; James M. Lea; Sarah L. Greenwood; Faezeh M. Nick; Lars Brunnberg; Alison MacLeod; Barbara Wohlfarth
• Keywords: Stadial; Chronology; Varve; Greenland ice sheet; Ice core; Meltwater

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