Benthic Foraminiferal Assemblages and the δ13C-Signal in the Atlantic Sector of the Southern Ocean: Glacial-to-Interglacial Contrasts
作者： A. Mackensen , H. Grobe , H.-W. Hubberten , G. Kuhn
DOI: 10.1007/978-3-642-78737-9_6
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摘要: We use benthic foraminiferal assemblages and δ13C to interpret glacial-to-interglacial contrasts in two gravity cores from the lower bathyal Antarctic continental margin at 69°S, abyssal Agulhas Basin 43°S. As a recent analogue, sediment surface samples an eastern Atlantic Ocean Weddell Sea transect between 20°–70°S are discussed. In investigated area, reflect both ocean circulation productivity. Also most stations belt with seasonally high productivity 48°S–55°S, values of epibenthic Cibicidoides spp., including F. wuellerstorfi depleted relative bottom water δ13C∑CO2 hence do not follow 1:1 relationship established for more northern areas. This bears implications interpretation large glacial-interglacial 513C shifts Southern Ocean: Significant parts this shift can be caused by northward migration belts associated Polar Front winter sea-ice limit rather than indicating nutrient-rich glacial deep water.
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