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Schmiedl, Gerhard; Mackensen, Andreas (1997): Benthic foraminifera analysis of two sediments cores from the northern Cape Basin in the eastern South Atlantic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.728744, Supplement to: Schmiedl, G; Mackensen, A (1997): Late Quaternary paleoproductivity and deep water circulation in the eastern South Altantic Ocean: Evidence from benthic foraminifera. Palaeogeography, Palaeoclimatology, Palaeoecology, 130(1-4), 43-80, https://doi.org/10.1016/S0031-0182(96)00137-X

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Abstract:
Two late Quaternary sediment cores from the northern Cape Basin in the eastern South Atlantic Ocean were analyzed for their benthic foraminiferal content and benthic stable carbon isotope composition. The locations of the cores were selected such that both of them presently are bathed by North Atlantic Deep Water (NADW) and past changes in deep water circulation should be recorded simultaneously at both locations. However, the areas are different in terms of primary production. One core was recovered from the nutrient-depleted Walvis Ridge area, whereas the other one is from the continental slope just below the coastal upwelling mixing area where present day organic matter fluxes are shown to be moderately high. Recent data served as the basis for the interpretation of the late Quaternary faunal fluctuations and the paleoceanographic reconstruction.
During the last 450,000 years, NADW flux into the eastern South Atlantic Ocean has been restricted to interglacial periods, with the strongest dominance of a NADW-driven deep water circulation during interglacial stages 1, 9 and 11. At the continental margin, high productivity faunas and very low epibenthic d13C values indicate enhanced fluxes of organic matter during glacial periods. This can be attributed to a glacial increase and lateral extension of coastal upwelling. The long term glacial-interglacial paleoproductivity cycles are superimposed by high-frequency variations with a period of about 23,000 yr. Enhanced productivity in surface waters above the Walvis Ridge, far from the coast, is indicated during glacial stages 8, 10 and 12. During these periods, cold, nutrient-rich filaments from the mixing area were probably driven as far as to the southeastern flank of the Walvis Ridge.
Project(s):
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
Coverage:
Median Latitude: -24.060833 * Median Longitude: 9.469167 * South-bound Latitude: -24.690000 * West-bound Longitude: 7.240000 * North-bound Latitude: -23.431667 * East-bound Longitude: 11.698333
Date/Time Start: 1990-03-22T00:00:00 * Date/Time End: 1992-01-11T00:00:00
Event(s):
GeoB1214-1 * Latitude: -24.690000 * Longitude: 7.240000 * Date/Time: 1990-03-22T00:00:00 * Elevation: -3210.0 m * Recovery: 5.08 m * Location: Cape Basin * Campaign: M12/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC KS, weiß
GeoB1710-3 * Latitude: -23.431667 * Longitude: 11.698333 * Date/Time: 1992-01-11T00:00:00 * Elevation: -2987.0 m * Recovery: 10.45 m * Location: Namibia continental slope * Campaign: M20/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: Karbonatschl., weißgrün
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
10 datasets

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Datasets listed in this publication series

  1. Schmiedl, G; Mackensen, A (1997): Table A1. Age model of sediment core GeoB1214-1. https://doi.org/10.1594/PANGAEA.52769
  2. Schmiedl, G; Mackensen, A (1997): Table A4. Benthic foraminifera counts, accumulation rates, and statistical analysis of sediment core GeoB1214-1. https://doi.org/10.1594/PANGAEA.52772
  3. Schmiedl, G; Mackensen, A (1997): Table A2. Benthic foraminifera assemblage of sediment core GeoB1214-1. https://doi.org/10.1594/PANGAEA.53157
  4. Schmiedl, G; Mackensen, A (1997): Table A6. Statistical analysis of late Quaternary benthic foraminiferal assemblages of sediment core GeoB1214-1. https://doi.org/10.1594/PANGAEA.728742
  5. Schmiedl, G; Mackensen, A (1997): Fig. 2. Stable isotope analysis on C. wuellerstorfi from sediment core GeoB1214-1. https://doi.org/10.1594/PANGAEA.52770
  6. Schmiedl, G; Mackensen, A (1997): Table A1. Age model of sediment core GeoB1710-3. https://doi.org/10.1594/PANGAEA.728683
  7. Schmiedl, G; Mackensen, A (1997): Table A5. Benthic foraminifera counts, accumulation rates, and statistical analysis of sediment core GeoB1710-3. https://doi.org/10.1594/PANGAEA.52773
  8. Schmiedl, G; Mackensen, A (1997): Table A3. Benthic foraminifera assemblage of sediment core GeoB1710-3. https://doi.org/10.1594/PANGAEA.53158
  9. Schmiedl, G; Mackensen, A (1997): Table A7. Statistical analysis of late Quaternary benthic foraminiferal assemblages of sediment core GeoB1720-3. https://doi.org/10.1594/PANGAEA.728743
  10. Schmiedl, G; Mackensen, A (1997): Fig. 2. Stable isotope analysis on C. wuellerstorfi from sediment core GeoB1710-3. https://doi.org/10.1594/PANGAEA.52771