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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 (2017): Oxygen isotope (δ¹⁸O) values of benthic ostracods from varved sediments from Mondsee (Austria) for the interval 7.7-8.7 ka BP. PANGAEA, https://doi.org/10.1594/PANGAEA.880316, Supplement to: Andersen, N et al. (2017): Evidence for higher-than-average air temperatures after the 8.2 ka event provided by a Central European d18O record. Quaternary Science Reviews, 172, 96-108, https://doi.org/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 (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.
Coverage:
Latitude: 47.811400 * Longitude: 13.402500
Minimum DEPTH, sediment/rock: 8.960 m * Maximum DEPTH, sediment/rock: 9.690 m
Event(s):
Mo05 * Latitude: 47.811400 * Longitude: 13.402500 * Elevation: 481.0 m * Lake water depth: 62 m * Recovery: 15 m * Location: Lake Mondsee, European Alps * Method/Device: Piston corer, UWITEC (PCUWI) * Comment: Composite profile consisting of two parallel cores Mo05_01 and Mo05_P3/Mo05_02 (13.89 and 11.72 m); DEPTH are given as composite depth.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmLauterbach, StefanGeocode – composite core depth, sample base
2Varve ageVarve agea BPLauterbach, Stefan
3AGEAgeka BPLauterbach, StefanGeocode
4Ostracoda, δ18OOstrac δ18O‰ PDBLauterbach, Stefan
5δ18O, waterδ18O H2O‰ SMOWLauterbach, StefanReconstructedlake water d18O
Size:
441 data points

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