Little, Mark G; Schneider, Ralph R; Kroon, Dick; Price, B; Bickert, Torsten; Wefer, Gerold (1997): Planktonic foraminiferal faunas and stable isotope ratios of sediments from the Benguela Upwelling System. PANGAEA, https://doi.org/10.1594/PANGAEA.734360, Supplement to: Little, MG et al. (1997): Rapid paleoceanographic changes in the Benguela Upwelling System for the last 160,000 years as indicated by abundances of planktonic foraminifera. Palaeogeography, Palaeoclimatology, Palaeoecology, 130(1-4), 135-161, https://doi.org/10.1016/S0031-0182(96)00136-8
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Two sediment cores retrieved from the continental slope in the Benguela Upwelling System, GeoB 1706 (19°33.7'S 11°10.5'E) and GeoB 1711 (23°18.9'S, 12°22.6'E), reveal striking variations in planktonic foraminiferal abundances during the last 160,000 years. These fluctuations are investigated to assess changes in the intensity and position of the upwelling centres off Namibia. Four species make up over 95% of the variation within the core, and enable the record to be divided into episodes characterized by particular planktonic foraminiferal assemblages. The fossil assemblages have meaningful ecological significance when compared to those of the modern day and the relationship to their environment. The cold-water planktonic foraminifer, Neogloboquadrina pachyderma sinistral [N. pachyderma (s)], dominates the modern-day, coastal upwelling centres, and Neogloboquadrina pachyderma dextral and Globigerina bulloides characterize the fringes of the upwelling cells. Globorotalia inflata is representative of the offshore boundary between newly upwelled waters and the transitional, reduced nutrient levels of the subtropical waters. In the fossil record, episodes of high N. pachyderma (s) abundances are interpreted as evidence of increased upwelling intensity, and the associated increase in nutrients. The N. pachyderma (s) record suggests temporal shifts in the intensity of upwelling, and corresponding trophic domains, that do not follow the typical glacial-interglacial pattern. Periods of high N. pachyderma (s) abundance describe rapid, discrete events dominating isotope stages 3 and 2. The timing of these events correlates to the temporal shifts of the Angola-Benguela Front (Jansen et al., 1997) situated to the north of the Walvis Ridge. Absence of high abundances of N. pachyderma (s) from the continental slope of the southern Cape Basin indicates that Southern Ocean surface water advection has not exerted a major influence on the Benguela Current System. The coincidence of increased upwelling intensity with the movement of the Angola-Benguela Front can be interpreted mainly by changes in strength and zonality of the trade wind system.
Median Latitude: -21.907708 * Median Longitude: 11.926250 * South-bound Latitude: -23.316667 * West-bound Longitude: 11.175000 * North-bound Latitude: -19.561667 * East-bound Longitude: 12.378333
Date/Time Start: 1992-01-08T00:00:00 * Date/Time End: 1992-01-11T00:00:00
GeoB1706-2 * Latitude: -19.561667 * Longitude: 11.175000 * Date/Time: 1992-01-08T00:00:00 * Elevation: -980.0 m * Recovery: 11.2 m * Location: Walvis Ridge * Campaign: M20/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: Tonschlamm, olivgrün, Forams, H2S
GeoB1711-4 (GeoB1711) * Latitude: -23.315000 * Longitude: 12.376667 * Date/Time: 1992-01-11T00:00:00 * Elevation: -1967.0 m * Recovery: 10.66 m * Location: Namibia continental slope * Campaign: M20/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: Tonschl., olive, H2S, Foram.
Datasets listed in this publication series
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A1) Stable oxygen isotope ratio of Cibicidoides wuellerstorfi from sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.218245
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A2) Stable carbon and oxygen isotope ratio of Globorotalia inflata from sediment core GeoB1706-2. https://doi.org/10.1594/PANGAEA.218244
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A3) Stable carbon and oxygen isotope ratio of Globigerina inflata from sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.52469
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A4) Relative abundances of planktonic foraminifera of sediment core GeoB1706-2. https://doi.org/10.1594/PANGAEA.52470
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A5) Relative abundances of planktonic foraminifera of sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.218246
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Appendix A5) Relative abundances of planktonic foraminifera of sediment core GeoB1711-5. https://doi.org/10.1594/PANGAEA.218247
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Table 1) Age control-points for the oxygen-isotope curve of sediment core GeoB1706-2. https://doi.org/10.1594/PANGAEA.734358
- Little, MG; Schneider, RR; Kroon, D et al. (1997): (Table 1) Age control-points for the oxygen-isotope curve of sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.734359