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

• Main Authors: Cayre, Olivia, Vincent, Edith, Lancelot, Yves, Hall, Michael A
• Format: Dataset
• Language: English
• Published: PANGAEA 1999
• Subjects: CALYPSO; Calypso Corer; DEPTH; sediment/rock; Globigerina bulloides; δ13C; δ18O; IMAGES; IMAGES I; International Marine Global Change Study; Marge Ibérique; Marion Dufresne (1995); Mass spectrometer VG SIRA; MD101; MD952042; MD95-2042; Sira; North Atlantic; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.60829; https://doi.org/10.1594/PANGAEA.60829

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. Temperature and salinity reconstructions indicate that the environment of the Iberian Margin has been under the combined influence of global factors such as the migration of the polar front and iceberg discharge and of regional factors such as the precipitation/evaporation regime on both oceanic and continental area.