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

Type Article
Date 2017-09
Language English
Author(s) Andersen Nils1, Lauterbach Stefan2, 3, Erlenkeuser Helmut1, Danielopol Dan L.4, 10, Namiotko TadeuszORCID5, Huels Matthias1, Belmecheri Soumaya6, 8, Dulski Peter2, Nantke Carla2, 9, Meyer HannoORCID7, Chapligin Bernhard7, von Grafenstein UlrichORCID6, Brauer Achim2
Affiliation(s) 1 : Univ Kiel, Leibniz Lab Radiometr Dating & Stable Isotope Res, D-24118 Kiel, Germany.
2 : GFZ German Res Ctr Geosci, Sect 5 2, Climate Dynam & Landscape Evolut, D-14473 Potsdam, Germany.
3 : Univ Innsbruck, Inst Geol, A-6020 Innsbruck, Austria.
4 : Karl Franzens Univ Graz, Inst Earth Sci Geol & Palaeontol, A-8010 Graz, Austria.
5 : Univ Gdansk, Fac Biol, Dept Genet, Lab Limnozool, PL-80308 Gdansk, Poland.
6 : CNRS, CEA, UMR 8212, Lab Sci Climat & Environm,UVSQ, F-91191 Gif Sur Yvette, France.
7 : Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Periglacial Res Sect, D-14473 Potsdam, Germany.
8 : Univ Arizona, Lab Tree Ring Res, Tucson, AZ 85721 USA.
9 : Lund Univ, Dept Geol, S-22362 Lund, Sweden.
10 : Austrian Acad Sci, Inst Limnol, A-5310 Mondsee, Austria.
Source Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-09 , Vol. 172 , P. 96-108
DOI 10.1016/j.quascirev.2017.08.001
WOS© Times Cited 10
Keyword(s) Holocene, Palaeoclimatology, Europe, Stable isotopes, 8.2 ka event, Lake sediments

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 (5180) 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 delta O-18 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.

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Andersen Nils, Lauterbach Stefan, Erlenkeuser Helmut, Danielopol Dan L., Namiotko Tadeusz, Huels Matthias, Belmecheri Soumaya, Dulski Peter, Nantke Carla, Meyer Hanno, Chapligin Bernhard, von Grafenstein Ulrich, 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, 96-108. Publisher's official version : https://doi.org/10.1016/j.quascirev.2017.08.001 , Open Access version : https://archimer.ifremer.fr/doc/00504/61597/