Evidence for higher-than-average air temperatures after the 8.2 ka event provided by a Central European δ18O record.

Andersen, Nils, Lauterbach, Stefan, Erlenkeuser, Helmut, Danielopol, Dan L., Namiotko, Tadeusz, Hüls, Matthias, Belmecheri, Soumaya, Dulski, Peter, Nantke, Carla, Meyer, Hanno, Chapligin, Bernhard, von Grafenstein, Ulrich and Brauer, Achim (2017) Evidence for higher-than-average air temperatures after the 8.2 ka event provided by a Central European δ18O record. Quaternary Science Reviews, 172 . pp. 96-108. DOI 10.1016/j.quascirev.2017.08.001.

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Abstract

The so-called 8.2 ka event represents one of the most prominent cold climate anomalies during the Holocene warm period. Accordingly, several studies have addressed its trigger mechanisms, absolute dating and regional characteristics so far. However, knowledge about subsequent climate recovery is still limited although this might be essential for the understanding of rapid climatic changes. Here we present a new sub-decadally resolved and precisely dated oxygen isotope (δ18O) record for the interval between 7.7 and 8.7 ka BP (103 calendar years before AD 1950), derived from the calcareous valves of benthic ostracods preserved in the varved lake sediments of pre-Alpine Mondsee (Austria). Besides a clear reflection of the 8.2 ka event, showing a good agreement in timing, duration and magnitude with other regional stable isotope records, the high-resolution Mondsee lake sediment record provides evidence for a 75-year-long interval of higher-than-average δ18O values directly after the 8.2 ka event, possibly reflecting increased air temperatures in Central Europe. This observation is consistent with evidence from other proxy records in the North Atlantic realm, thus most probably reflecting a hemispheric-scale climate signal rather than a local phenomenon. As a possible trigger we suggest an enhanced resumption of the Atlantic meridional overturning circulation (AMOC), supporting assumptions from climate model simulations.

Document Type: Article
Keywords: Holocene, Palaeoclimatology, Europe, Stable isotopes, 8.2 ka event, Lake sediments
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.quascirev.2017.08.001
ISSN: 0277-3791
Projects: Future Ocean
Date Deposited: 23 Feb 2018 09:48
Last Modified: 23 Sep 2019 21:42
URI: http://oceanrep.geomar.de/id/eprint/41994

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