Oxygen isotope (δ¹⁸O) values of benthic ostracods from varved sediments from Mondsee (Austria) for the interval 7.7-8.7 ka BP

• Main Authors: 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, Brauer, Achim
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: AGE; AWI_Envi; DEPTH; sediment/rock; Lake Mondsee; European Alps; Mo05; Ostracoda; δ18O; PCUWI; Piston corer; UWITEC; Polar Terrestrial Environmental Systems @ AWI; Reconstructed; Varve age; water; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.880316; https://doi.org/10.1594/PANGAEA.880316

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 (d18O) record for the interval between 7.7 and 8.7 ka BP, 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 d18O 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.