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Grain size parameter of sediment core PS2513-3

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.56015
Keywords
  • Ant-Xi/2
  • Awi_Paleo
  • Calculated
  • Grain Size
  • Sedigraph 5000
  • Mean
  • Grain Size
  • Paleoenvironmental Reconstructions From Marine Sediments @ Awi
  • Piston Corer (Bgr Type)
  • Polarstern
  • Ps2513-3
  • Ps28
  • Ps28/373
  • Scotia Sea
  • Southwest Atlantic
  • Silt
  • Mean
  • Standard Deviation
  • Silt-Mean
  • Size Fraction > 0
  • 010 Mm
Disciplines
  • Archaeology
  • Earth Science
  • Ecology

Abstract

Microsoft Word - bonn-.doc original reference: Palaeoproductivity at the Antarctic continental margin: opal and barium records for the last 400 ka Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 139, Issues 3-4, May 1998, Pages 195-211 Paleoproductivity at the Antarctic continental margin: opal and barium records for the last 400 ka Wolfgang J. Bonn1, Franz X. Gingele2, Hannes Grobe1, Andreas Mackensen1 and Dieter K. Fütterer1 1: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27515 Bremerhaven, Germany 2: Baltic Sea Research Institute, Seestrasse 15, 18119 Rostock- Warnemuende, Germany 2 Abstract 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 paleoproductivity 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 dissolution of opal in the water column and the sediment does not obscure the surface productivity signal. Therefore, in this area biogenic opal in combination with other proxies, can be used for pa

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