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Wefer, Gerold; Berger, Wolfgang H; Bickert, Torsten; Donner, Barbara; Fischer, Gerhard; Kemle-von Mücke, Sylvia; Pätzold, Jürgen; Meinecke, Gerrit; Müller, Peter J; Mulitza, Stefan; Niebler, Hans-Stefan; Schmidt, Heike; Schneider, Ralph R; Segl, Monika (1996): Stable isotope record of planktonic foraminifera of the South Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.738529, Supplement to: Wefer, G et al. (1996): Late Quaternary surface circulation of the South Atlantic: The stable isotope record and implications for heat transport and productivity. In: Wefer, G; Berger, W H; Siedler, G & Webb, D (eds.), The South Atlantic: Present and Past Circulation, Springer, Berlin, Heidelberg, 461-502

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Abstract:
The central problem of late Quaternary circulation in the South Atlantic is its role in transfer of heat to the North Atlantic, as this modifies amplitude, and perhaps phase, of glacialinterglacial fluctuations. Here we attempt to define the problem and establish ways to attack it. We identify several crucial elements in the dynamics of heat export: (1) warm-water pile-up (and lack thereof) in the Western equatorial Atlantic, (2) general spin-up (or spin-down) of central gyre, tied to SE trades, (3) opening and closing of Cape Valve (Agulhas retroflection), (4) deepwater E-W asymmetry. Means for reconstruction are biogeography, stable isotopes, and productivity proxies. Main results concern overall glacial-interglacial contrast (less pile-up, more spin-up, Cape Valve closed, less NADW during glacial time), dominance of precessional signal in tropics, phase shifts in precessional response. To generate working hypotheses about the dynamics of surface water circulation in the South Atlantic we employ Croll's paradigm that glacial - interglacial fluctuations are analogous to seasonal fluctuations. Our general picture for the last 300 kyrs is that, as concerns the South Atlantic, intensity of surface water (heat) transport depends on the strength of the SE trades. From various lines of evidence it appears that strenger SE trades appeared during glacials and cold substages during interglacials, analogous to conditions in southern winter (August).
Project(s):
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
Coverage:
Median Latitude: -10.607458 * Median Longitude: -10.068213 * South-bound Latitude: -24.033333 * West-bound Longitude: -41.621667 * North-bound Latitude: 3.831667 * East-bound Longitude: 9.185833
Date/Time Start: 1988-03-02T00:00:00 * Date/Time End: 1991-05-17T00:00:00
Event(s):
GeoB1028-4 * Latitude: -20.099333 * Longitude: 9.177667 * Date/Time: 1988-03-02T00:00:00 * Elevation: -2215.0 m * Penetration: 0.37 m * Recovery: 0.35 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Karb.-sand, Forams.
GeoB1028-5 * Latitude: -20.104000 * Longitude: 9.185833 * Date/Time: 1988-03-02T00:00:00 * Elevation: -2209.0 m * Penetration: 12 m * Recovery: 10.79 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: Karb.-schl., sandig, For.
GeoB1031-1 * Latitude: -21.889167 * Longitude: 7.101667 * Date/Time: 1988-03-03T00:00:00 * Elevation: -3103.0 m * Penetration: 0.2 m * Recovery: 0.2 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-sand, weiß
Size:
10 datasets

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Datasets listed in this publication series

  1. Wefer, G; Berger, WH; Bickert, T et al. (1996): Distribution of planktonic foraminifera of site GeoB1105. https://doi.org/10.1594/PANGAEA.54710
  2. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of Globorotalia truncatulinoides of sediment core GeoB1523-1. https://doi.org/10.1594/PANGAEA.54615
  3. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of sediment core GeoB1032. https://doi.org/10.1594/PANGAEA.54655
  4. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of sediment core GeoB1523-2. https://doi.org/10.1594/PANGAEA.54618
  5. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1028. https://doi.org/10.1594/PANGAEA.54653
  6. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1031. https://doi.org/10.1594/PANGAEA.54654
  7. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1105. https://doi.org/10.1594/PANGAEA.54656
  8. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1112. https://doi.org/10.1594/PANGAEA.54657
  9. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1220. https://doi.org/10.1594/PANGAEA.54658
  10. Wefer, G; Berger, WH; Bickert, T et al. (1996): Stable carbon and oxygen isotope ratios of planktonic foraminifera of site GeoB1413. https://doi.org/10.1594/PANGAEA.54659