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Raimund Muscheler

Raimund Muscheler

Professor

Raimund Muscheler

Synchronizing the Western Gotland Basin (Baltic Sea) and Lake Kälksjön (central Sweden) sediment records using common cosmogenic radionuclide production variations

Author

  • Markus Czymzik
  • Marcus Christl
  • Olaf Dellwig
  • Raimund Muscheler
  • Daniela Müller
  • Jérôme Kaiser
  • Markus J. Schwab
  • Carla K.M. Nantke
  • Achim Brauer
  • Helge W. Arz

Summary, in English

Multi-archive studies of climate events and archive-specific response times require synchronous time scales. Aligning common variations in the cosmogenic radionuclide production rate via curve fitting methods provides a tool for the continuous synchronization of natural environmental archives down to decadal precision. Based on this approach, we synchronize 10Be records from Western Gotland Basin (WGB, Baltic Sea) and Lake Kälksjön (KKJ, central Sweden) sediments to the 14C production time series from the IntCal20 calibration curve during the Mid-Holocene period ~6400 to 5200 a BP. Before the synchronization, we assess and reduce non-production variability in the 10Be records by using 10Be/9Be ratios and removing common variability with the TOC record from KKJ sediments based on regression analysis. The synchronizations to the IntCal20 14C production time scale suggest decadal to multi-decadal refinements of the WGB and KKJ chronologies. These refinements reduce the previously centennial chronological uncertainties of both archives to about ± 20 (WGB) and ±40 (KKJ) years. Combining proxy time series from the synchronized archives enables us to interpret a period of ventilation in the deep central Baltic Sea basins from ~6250 to 6000 a BP as possibly caused by inter-annual cooling reducing vertical water temperature gradients allowing deep water formation during exceptionally cold winters.

Department/s

  • Quaternary Sciences
  • MERGE: ModElling the Regional and Global Earth system

Publishing year

2024

Language

English

Pages

1128-1137

Publication/Series

Holocene

Volume

34

Issue

8

Document type

Journal article

Publisher

SAGE Publications

Topic

  • Geology

Keywords

  • Be
  • chronology
  • Mid-Holocene climate
  • sediment archives
  • time scale synchronization
  • western Baltic region

Status

Published

ISBN/ISSN/Other

  • ISSN: 0959-6836