Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic ...

• Main Authors: Mackensen, Andreas, Rudolph, Miriam, Kuhn, Gerhard
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2001
• Subjects: Gravity corer Kiel type; Piston corer BGR type; ANT-XI/2; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Southern Ocean; Andreas; Rudolph
• Online Access: https://dx.doi.org/10.1594/pangaea.728242; https://doi.pangaea.de/10.1594/PANGAEA.728242

We present three new benthic foraminiferal delta13C, delta18O, and total organic carbon time series from the eastern Atlantic sector of the Southern Ocean between 41°S and 47°S. The measured glacial delta13C values belong to the lowest hitherto reported. We demonstrate a coincidence between depleted late Holocene (LH) delta13C values and positions of sites relative to ocean surface productivity. A correction of +0.3 to +0.4 [per mil VPDB] for a productivity-induced depletion of Last Glacial Maximum (LGM) benthic delta13C values of these cores is suggested. The new data are compiled with published data from 13 sediment cores from the eastern Atlantic Ocean between 19°S and 47°S, and the regional deep and bottom water circulation is reconstructed for LH (4-0 ka) and LGM (22-16 ka) times. This extends earlier eastern Atlantic-wide synoptic reconstructions which suffered from the lack of data south of 20°S. A conceptual model of LGM deep-water circulation is discussed that, after correction of southernmost cores ... : Supplement to: Mackensen, Andreas; Rudolph, Miriam; Kuhn, Gerhard (2001): Late Pleistocene deep-water circulation in the subantarctic eastern Atlantic. Global and Planetary Change, 30(3-4), 197-229 ...