EGU22-11671
https://doi.org/10.5194/egusphere-egu22-11671
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Abrupt climate events recorded in speleothems from the ante penultimate glacial

Vanessa Skiba1, Martin Trüssel2, Birgit Plessen3, Christoph Spötl4, René Eichstädter5, Andrea Schröder-Ritzrau5, Tobias Braun1, Takahito Mitsui1,6, Norbert Frank5, Niklas Boers1,6,7, Norbert Marwan1, and Jens Fohlmeister1,3,8
Vanessa Skiba et al.
  • 1Potsdam Institute for Climate Impact Research, Potsdam, Germany (skiba@pik-potsdam.de)
  • 2Stiftung Naturerbe Karst und Höhlen Obwalden (NeKO), Alpnach, Switzerland
  • 3German Research Centre for Geosciences (GFZ), Climate Dynamics and Landscape Development, Potsdam, Germany
  • 4Institute of Geology, University of Innsbruck, Innsbruck, Austria
  • 5Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
  • 6Earth System Modelling, School of Engineering & Design, Technical University of Munich, Munich, Germany
  • 7Department of Mathematics and Global Systems Institute, University of Exeter, Exeter, United Kingdom
  • 8German Federal Office for Radiation Protection (BfS), Berlin, Germany

Millennial-scale climate variability, especially abrupt stadial-interstadial transitions, are a prominent feature of the last glacial as recorded in Greenland ice core records (Dansgaard-Oeschger events). Event abruptness and presence of statistical early warning signals before these transitions indicate that they involve repeated crossing of a tipping point of the climate system. However, only little information is available for periods before the last glacial period as Greenland ice cores and many other high-resolution records do not extent beyond the last glacial cycle. Given the lack of understanding of the triggering mechanism responsible for glacial millennial-scale variability with palaeoclimate data from the last glacial, it is essential to investigate this phenomenon during earlier glacial periods.

Here, we present a new highly resolved, precisely U-Th-dated speleothem oxygen isotope record from the Northern European Alps, a region which has been previously shown to resemble the glacial millennial-scale climate variability obtained from Greenland ice core records very well. Our new data covers the time interval from the ante-penultimate glacial to the penultimate glacial (MIS8-MIS6) with a high degree of replication. For both glacial periods, we find phases of pronounced millennial-scale variability but also several, ~10 ka long phases with the climate system being exclusively in stadial conditions. We compare our data with conceptual model results and investigate the occurrence and absence of abrupt climate transitions of the last 300,000 a.

How to cite: Skiba, V., Trüssel, M., Plessen, B., Spötl, C., Eichstädter, R., Schröder-Ritzrau, A., Braun, T., Mitsui, T., Frank, N., Boers, N., Marwan, N., and Fohlmeister, J.: Abrupt climate events recorded in speleothems from the ante penultimate glacial, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-11671, https://doi.org/10.5194/egusphere-egu22-11671, 2022.

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