(Table S1) Age determination of sediment cores of the Azores Current System ...

• Main Authors: Schwab, Christian, Kinkel, Hanno, Weinelt, M, Repschläger, Janne
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Event label; DEPTH, sediment/rock; Age, dated; Age, dated standard deviation; Reservoir effect/correction; Age model; Piston corer; Calypso Corer; Age, 14C AMS; Age, 14C calibrated, CALIB 6.0 and Marine09 Reimer et al., 2009; GEOFAR; MD168; Le Noroit; Marion Dufresne 1995; Reimer; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.824858; https://doi.pangaea.de/10.1594/PANGAEA.824858

In order to test the sensitivity of marine primary productivity in the midlatitude open ocean North Atlantic to changes in the Atlantic Meridional Overturning Circulation (AMOC), we investigated two spliced sediment cores from a site south of the Azores Islands at the northern rim of the North Atlantic subtropical gyre. For this purpose we analyzed coccolithophore assemblages, diatom abundances, alkenones and conducted X-ray fluorescence (XRF) core scanning. During times of reduced AMOC, especially during Heinrich event 1 (H1) and the Younger Dryas, we observe a strong increase in productivity as evidenced by high coccolith accumulation rates, high alkenone concentrations/accumulation rates, high Ba/Ti-ratios, high abundances of diatoms and low abundances ofF. profunda. The increased productivity is partly caused by a more southern position of the Azores Front (AzF), and hence by a less northward extension of the subtropical gyre, as deduced from high abundances of the temperate coccolithophore species G. ... : AMS determination on monospecific planktonic foraminifera (Globigerinoides runber white or Globigerina bulloides). ...