Opal and barium records of six sediment cores for the last 400 ka ...

• Main Authors: Bonn, Wolfgang J, Gingele, Franz, Grobe, Hannes, Mackensen, Andreas, Fütterer, Dieter K
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1998
• Subjects: Gravity corer Kiel type; ANT-IV/3; ANT-V/4; ANT-VI/3; ANT-VIII/6; ANT-IX/3; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Silicon Cycling in the World Ocean SINOPS; Antarc*; Antarctic; Antarctic Ocean; NADW; North Atlantic Deep Water; North Atlantic; Sea ice; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.728665; https://doi.pangaea.de/10.1594/PANGAEA.728665

Records of biogenic opal and barium were measured in sediment cores at the Antarctic continental margin in the area of the Weddell, Lazarev and Cosmonaut seas. These records provide a qualitative and quantitative tool to estimate changes in palaeoproductivity over the last 400 ka. The stratigraphy of the investigated cores is calibrated to a lithostratigraphy, adjusted to a stable isotope record from the eastern Weddell Sea, which is supported by a Th-dating method. We present evidence that interglacial productivity along the Antarctic continental margin is twice as high compared to subantarctic sites near South Orkney. A glacial/interglacial pattern with high productivity during peak warm stages can be observed back to 400 ka. High interglacial productivity is linked to a reduced sea-ice coverage, which is regulated by the heat flux introduced by North Atlantic Deep Water (NADW) to the Antarctic Ocean. Generally, good correlations between the barium and opal records of the sediment cores indicate that ... : Supplement to: Bonn, Wolfgang J; Gingele, Franz; Grobe, Hannes; Mackensen, Andreas; Fütterer, Dieter K (1998): Palaeoproductivity at the Antarctic continental margin: opal and barium records for the last 400 ka. Palaeogeography, Palaeoclimatology, Palaeoecology, 139(3-4), 195-211 ...