Talk by Prof. Dominik Fleitmann, University of Bern – Niels Bohr Institute - University of Copenhagen

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Talk by Prof. Dominik Fleitmann, University of Bern

Absolute timing of Dansgaard-Oeschger events in stalagmites


Abstract:
Speleothems, such as stalagmites, stalactites and flowstones, are a rich archive of terrestrial paleoclimate information. The full potential of these materials has come to realization only during the last decade creating a surge in speleothem-based research. This has led to focused and high-quality research that has utilised many of the more recently available state-of-the-art sampling (e.g. laser ablation mass spectrometry) and dating (e.g. multi-collector ICPMS) techniques. This wave of research has contributed to some of the more compelling paleoclimate records produced in this period and placed speleothems at the forefront of paleoenvironment reconstructions.

A particular strengths of speleothem records are their potential for constructing long (1000-100.000 years) and highly resolved records with very precise chronologies, leading to significant advances in identifying and dating major climatic events and transitions, such as Dansgaard-Oeschger (D-O) events or glacial-interglacial terminations. In my talk I will give an overview of stalagmite records showing well-expressed D-O events in their isotopic profiles. The timing of the D-O events in these records will be then compared to the most recent ice core chronology (GICC05) from Greenland.

 

Like ice cores, stalagmites reveal information from time periods far back in time.

Like ice cores, stalagmites reveal information from time periods far back in time.