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Howard, William R; Prell, Warren L (1992): Planktonic foraminifera, stable isotopes and sea surface temperature reconstruction of Southern Indian Ocean sediment cores. PANGAEA, https://doi.org/10.1594/PANGAEA.733700, Supplement to: Howard, WR; Prell, WL (1992): Late Quaternary surface circulation of the southern Indian Ocean and its relationship to orbital variations. Paleoceanography, 7(1), 79-118, https://doi.org/10.1029/91PA02994

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Abstract:
The paleoceanographic history of the Southern Indian Ocean is reflected by the movement of two prominent dynamical features of the Southern Ocean: the Subtropical Convergence (STC) and the Antarctic Polar Front (APF). These fronts, and their associated sea surface temperature (SST) signatures, are well delineated by planktonic foraminiferal faunas in surface sediments of the southern Indian Ocean. Using a transect of piston cores between 42°S and 48°S at about 90°E, we have reconstructed the latitudinal distribution of planktonic foraminiferal faunas over the past 500,000 years. These faunal variations imply changes in the paleolatitudes of the STC and APF and the surface isotherms associated with the fronts. Stratigraphic and chronologic control is provided by delta18O, %CaCO3, and biostratigraphy. Our reconstruction indicates that the STC has been equatorward of its present position (~40°S) for most of the past 500,000 years and has been poleward of that position for only four relatively brief (~10,000-year) intervals during that time. We estimate six equatorward excursions of the APF over the same period, with a maximum total range of about six degrees of latitude. The average paleo-position of the APF is about 46°S, about 4°north of its present position (~50°S). Ice-rafted debris, another indicator of APF position, occurs as far north as 45°S during glacial intervals. Latitudinal gradients in SST show little glacial-interglacial change between 42° and 48°S, suggesting that surface isotherms were displaced uniformly or that compression of SST gradients occurred outside the transect. Time series analyses of the SST records in this transect reveal statistically significant concentrations of variance in the primary orbital frequency bands. SST variations in these bands are coherent with orbital variations and with changes in delta18O. SST in the subantarctic Indian Ocean slightly precedes changes in delta18O occurring in the eccentricity, obliquity, and precession bands, and lag orbital variations in the obliquity and precession bands. These results place important constraints on possible mechanisms of interhemispheric climatic timing. The similarities in temporal patterns and timing among Southern Ocean SST, atmospheric CO2, and relative flux of North Atlantic Deep Water implicate atmospheric carbon dioxide and deep water circulation as possible interhemispheric pacing mechanisms.
Coverage:
Median Latitude: -45.600000 * Median Longitude: 94.638429 * South-bound Latitude: -48.280000 * West-bound Longitude: 79.867000 * North-bound Latitude: -42.185000 * East-bound Longitude: 106.518000
Date/Time Start: 1967-04-18T00:00:00 * Date/Time End: 1971-01-01T00:00:00
Event(s):
ELT45.029-PC * Latitude: -44.877000 * Longitude: 106.518000 * Date/Time: 1970-01-01T00:00:00 * Elevation: -3867.0 m * Recovery: 11.74 m * Campaign: ELT45 * Basis: Eltanin * Device: Piston corer (PC)
ELT49.017-PC * Latitude: -48.280000 * Longitude: 90.247000 * Date/Time: 1971-01-01T00:00:00 * Elevation: -3546.0 m * Recovery: 18.11 m * Campaign: ELT49 * Basis: Eltanin * Device: Piston corer (PC)
ELT49.018-PC * Latitude: -46.050000 * Longitude: 90.155000 * Date/Time: 1971-01-01T00:00:00 * Elevation: -3282.0 m * Recovery: 16.76 m * Campaign: ELT49 * Basis: Eltanin * Device: Piston corer (PC)
Size:
21 datasets

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Datasets listed in this publication series

  1. Howard, WR; Prell, WL (1992): (Table 2a) Stable carbon and oxygen isotope ratios of Globigerina bulloides from sediment core ELT49.021-PC. https://doi.org/10.1594/PANGAEA.733660
  2. Howard, WR; Prell, WL (1992): (Table 2b) Stable carbon and oxygen isotope ratios of Globigerina bulloides from sediment core ELT45.029-PC. https://doi.org/10.1594/PANGAEA.733657
  3. Howard, WR; Prell, WL (1992): (Table 2c) Stable carbon and oxygen isotope ratios of Globigerina bulloides from sediment core ELT49.018-PC. https://doi.org/10.1594/PANGAEA.733659
  4. Howard, WR; Prell, WL (1992): (Table 2d) Stable carbon and oxygen isotope ratios of Globigerina bulloides from sediment core ELT49.017-PC. https://doi.org/10.1594/PANGAEA.733658
  5. Howard, WR; Prell, WL (1992): (Table 2e) Stable carbon and oxygen isotope ratios of Globigerina bulloides from sediment core ELT49.023-PC. https://doi.org/10.1594/PANGAEA.733661
  6. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core ELT45.029-PC. https://doi.org/10.1594/PANGAEA.263943
  7. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core ELT49.017-PC. https://doi.org/10.1594/PANGAEA.263944
  8. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core ELT49.018-PC. https://doi.org/10.1594/PANGAEA.263945
  9. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core ELT49.021-PC. https://doi.org/10.1594/PANGAEA.263946
  10. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core ELT49.023-PC. https://doi.org/10.1594/PANGAEA.263947
  11. Howard, WR; Prell, WL (1992): (Table 3) Age model of sediment core RC11-120. https://doi.org/10.1594/PANGAEA.263940
  12. Howard, WR; Prell, WL (1992): (Table 6) Faunal dissimilarity and sea surface temperture estimates for sediment core ELT45.029. https://doi.org/10.1594/PANGAEA.733683
  13. Howard, WR; Prell, WL (1992): (Table 6) Faunal dissimilarity and sea surface temperture estimates for sediment core ELT49.017-PC. https://doi.org/10.1594/PANGAEA.733684
  14. Howard, WR; Prell, WL (1992): (Table 6) Faunal dissimilarity and sea surface temperture estimates for sediment core ELT49.018-PC. https://doi.org/10.1594/PANGAEA.733685
  15. Howard, WR; Prell, WL (1992): (Table 6) Faunal dissimilarity and sea surface temperture estimates for sediment core ELT49.021-PC. https://doi.org/10.1594/PANGAEA.733686
  16. Howard, WR; Prell, WL (1992): (Table 6) Faunal dissimilarity and sea surface temperture estimates for sediment core ELT49.023-PC. https://doi.org/10.1594/PANGAEA.733687
  17. Howard, WR; Prell, WL (1992): Planktic foraminifera assemblage of sediment core ELT45.029-PC. https://doi.org/10.1594/PANGAEA.51613
  18. Howard, WR; Prell, WL (1992): Planktic foraminifera assemblage of sediment core ELT49.017-PC. https://doi.org/10.1594/PANGAEA.51614
  19. Howard, WR; Prell, WL (1992): Planktic foraminifera assemblage of sediment core ELT49.018-PC. https://doi.org/10.1594/PANGAEA.51615
  20. Howard, WR; Prell, WL (1992): Planktic foraminifera assemblage of sediment core ELT49.021-PC. https://doi.org/10.1594/PANGAEA.51616
  21. Howard, WR; Prell, WL (1992): Planktic foraminifera assemblage of sediment core ELT49.023-PC. https://doi.org/10.1594/PANGAEA.51617