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

• Published in: Quaternary Science Reviews
• Main Authors: Andersen, Nils, Lauterbach, Stefan, Erlenkeuser, Helmut, Danielopol, Dan, Namiotko, Tadeusz, Hüls, Matthias, Belmecheri, Soumaya, Dulski, Peter, Nantke, Carla, Meyer, Hanno, Chapligin, Bernhard, Von Grafenstein, Ulrich, Brauer, Achim
• Other Authors: Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-University, German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), University of Innsbruck, Karl-Franzens-Universität Graz, Autriche, Laboratory of Limnozoology, Department of Genetics, University of Gdańsk (UG), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Alfred Wegener Institute Potsdam, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: anthro-bio; envir; North Atlantic
• Online Access: https://doi.org/10.1016/j.quascirev.2017.08.001; https://hal.archives-ouvertes.fr/hal-02461927/file/Andersen_2017_QSR.pdf; https://hal.archives-ouvertes.fr/hal-02461927

International audience 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 (d 18 O) record for the interval between 7.7 and 8.7 ka BP (10 3 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 d 18 O 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.