Stable oxygen and carbon isotope ratios of Globigerina bulloides in sediment core MD95-2042 of the Iberian Margin, North Atlantic

A quantitative analysis of planktonic foraminifera in a core from the Iberian Margin allows a reconstruction of the evolution of oceanographic parameters during the last glacial cycle with a resolution of ~1000 years. A principal component analysis performed on 19 species allows the identification of 11 intervals characterized by increased abundances of the subpolar species. The youngest six of these intervals are correlated with the last 6 Heinrich events (HEs). The five cold events older than stage 4 are dated at 81, 90, 110, 129, and 140 ka, respectively. Paleotemperatures reconstructed using the modern analog technique indicate 4°C decreases during all even-numbered isotopic stages and stage 3. During the HEs, temperature decreases reach ~10°C and seawater delta18O anomalies reach ~1 per mil. […]

对伊比利亚边缘岩芯中浮游有孔虫的定量分析，使得我们能够以约1000年的分辨率重建过去冰期周期中海洋学参数的演变。通过对19种物种进行的主成分分析，识别出11个由亚极地物种丰度增加所特征化的时间段。其中最年轻的六个时间段与最后六个海因里希事件（HEs）相关。超过阶段4的五个冷事件分别定年于81、90、110、129和140千年前。采用现代类比技术重建的古温度表明，在所有偶数同位素阶段和阶段3期间，温度降低了4°C。在海因里希事件期间，温度下降可达约10°C，海水δ18O异常值达到约1‰。