Age determination of sediment core GS06-144-03@en

We obtained a total of 12 accelerator mass spectrometry (AMS) 14C dates, based on the calcareous shells of the planktonic foraminifera Neogloboquadrina pachyderma (sinistral). The dates were analyzed on the Accelerator Mass Spectrometer at the Leibniz Labor für Altersbestimmung und Isotopenforschung in Kiel, Germany. Radiocarbon ages have been converted into calendar years using the CALIB (rev 5.0.1) software (Stuiver and Reimer, 1993) in conjunction with the Marine04 calibration dataset (Hughen et al., 2004). All dates were calibrated with a constant surface reservoir age of 400 years. The sample at 0 cm showed erroneous age because of severe addition of more than 100% modern carbon (pMC) and is assumed to be post-AD 1962 (relative to the increase in bomb radiocarbon levels in the North Atlantic region). Core was collected in 2006. (Cesium spike in 210Pb in upper 12 cm of the core sediments confirm post-AD 1964 age)