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Dan Hammarlund

Dan Hammarlund

Professor

Dan Hammarlund

Synchronous or Not? The Timing of the Younger Dryas and Greenland Stadial-1 Reviewed Using Tephrochronology

Author

  • Simon A. Larsson
  • Malin E. Kylander
  • A. Britta K. Sannel
  • Dan Hammarlund

Summary, in English

The exact spatial and temporal behaviour of rapid climate shifts during the Last Glacial– Interglacial Transition are still not entirely understood. In order to investigate these events, it is necessary to have detailed palaeoenvironmental reconstructions at geographically spread study sites combined with reliable correlations between them. Tephrochronology, i.e., using volcanic ash deposits in geological archives as a dating and correlation tool, offers opportunities to examine the timing of events across wider regional scales. This study aims to review the posited asynchrony of the Younger Dryas stadial in comparison with Greenland Stadial-1 by correlating new proxy data from southernmost Sweden to previous palaeoclimate reconstructions in Europe based on the presence of the Hässeldalen Tephra, the Vedde Ash, and the Laacher See Tephra. µ-XRF core-scanning data were projected using a recently published age–depth model based on these tephras and several radiocarbon dates, and compared to previous findings, including by adapting previous chronologies to the recently proposed earlier date of the Laacher See Tephra (13,006 ± 9 cal. a BP). Although the results to some extent support the idea of a more synchronous Younger Dryas event than previously assumed, this issue requires further high-resolution proxy studies to overcome limitations of temporal precision.

Department/s

  • MERGE: ModElling the Regional and Global Earth system
  • Department of Geology

Publishing year

2022-06

Language

English

Publication/Series

Quaternary

Volume

5

Issue

2

Document type

Journal article

Publisher

MDPI AG

Topic

  • Climate Research
  • Geology

Keywords

  • Hässeldalen Tephra
  • Laacher See Tephra
  • LGIT
  • palaeoclimate
  • Scandinavia
  • tephrostratigraphy
  • Vedde Ash
  • XRF

Status

Published

ISBN/ISSN/Other

  • ISSN: 2571-550X