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)本研究共获取12组加速器质谱法（accelerator mass spectrometry, AMS）¹⁴C测年数据，测年材料为浮游有孔虫粗厚新抱球虫（左旋型，Neogloboquadrina pachyderma (sinistral)）的钙质壳体。上述测年分析由德国基尔莱布尼茨年代测定与同位素研究实验室（Leibniz Labor für Altersbestimmung und Isotopenforschung）的加速器质谱仪完成。研究人员使用CALIB（rev 5.0.1）软件（Stuiver与Reimer, 1993）结合Marine04校准数据集（Hughen等, 2004），将放射性碳年龄转换为日历年代。所有测年数据均采用400年的恒定表层储库年龄进行校准。0 cm深度的样品因严重混入超过100%的现代碳百分比（percent modern carbon, pMC）而出现年龄误差，结合北大西洋地区炸弹放射性碳水平升高的背景，推测其年代晚于公元1962年。该岩芯采集于2006年。岩芯上部12 cm沉积物中的铯异常峰值结合²¹⁰Pb测年结果，证实其年代晚于公元1964年。