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Charles, Christopher D; Froelich, Philip N; Zibello, Michael A; Mortlock, Richard A; Morley, Joseph J (1991): Biogenic opal, carbonat concentrations and stable oxygen isotope ratios of foraminifera from sediment cores of the Southern Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.727615, Supplement to: Charles, CD et al. (1991): Biogenic opal in southern ocean sediments over the last 450,000 years: implications for surface water chemistry and circulation. Paleoceanography, 6(6), 697-728, https://doi.org/10.1029/91PA02477

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Abstract:
We present records of biogenic opal percentage and burial rate in 12 piston cores from the Atlantic and Indian sectors of the Southern Ocean. These records provide a detailed, quantitative description of changing patterns of opal deposition over the last 450 kyr. The striking regional coherence of these records suggests that dissolution in the deep sea and sediment pore waters does not obscure the surface productivity signal, and therefore these opal time series can be used in combination with other surface water tracers to make inferences about the chemistry and circulation of the Southern Ocean under different global climate conditions. Three broad depositional patterns can be distinguished. Northernmost records (39°-42°S latitude) are characterized by enhanced opal burial during glacial periods and strong 41 kyr periodicity. Records from cores just north of the present Antarctic Polar Front (46°-49°S) show even larger increases in opal burial rate during glacial intervals, but have variance concentrated in the 100 and 23 kyr bands. Southernmost records (51°-55°S) are completely out of phase with those to the north, with greatly reduced opal burial rates during glacial periods. Taken as a whole, the opal records show no evidence for the increased total Antarctic productivity predicted by recent geochemical models of atmospheric CO2 variability. The areal expansion of Southern Ocean sea ice over the present zone of high siliceous productivity provides one plausible explanation for the glacial-interglacial opal patterns. The excess silica not taken up in this zone during glacial periods would contribute to greater nutrient availability and thus higher productivity in the subantarctic region. However, local circulation changes may act to modify this basic signal, possibly accounting for the observed differences in the opal variance spectra.
Coverage:
Median Latitude: -46.703500 * Median Longitude: 43.278833 * South-bound Latitude: -53.880000 * West-bound Longitude: -20.860000 * North-bound Latitude: -42.980000 * East-bound Longitude: 106.518000
Date/Time Start: 1966-04-05T00:00:00 * Date/Time End: 1972-01-22T00:00:00
Event(s):
ELT45.029-TC * Latitude: -44.877000 * Longitude: 106.518000 * Date/Time: 1970-01-01T00:00:00 * Elevation: -3867.0 m * Recovery: 0.95 m * Campaign: ELT45 * Basis: Eltanin * Device: Gravity corer (GC)
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:
12 datasets

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Datasets listed in this publication series

  1. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A1) CaCO3 and opal content of sediment core RC11-120. https://doi.org/10.1594/PANGAEA.52463
  2. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A10) Opal content of sediment core ELT49.018-PC. https://doi.org/10.1594/PANGAEA.52436
  3. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A11) Opal content and stable oxygen isotope ratios of Cibicides spp. from sediment core ELT49.019-PC. https://doi.org/10.1594/PANGAEA.712442
  4. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A12) Opal content of sediment core ELT49.023-PC. https://doi.org/10.1594/PANGAEA.52437
  5. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A2) CaCO3, opal, and stable oxygen isotope ratios of Neogloboquadrina pachyderma from sediment core RC13-259. https://doi.org/10.1594/PANGAEA.52428
  6. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A3) Opal content and stable oxygen isotope ratios of Neogloboquadrina pachyderma from sediment core RC13-271. https://doi.org/10.1594/PANGAEA.52429
  7. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A4) CaCO3, opal, and stable oxygen isotope ratios of Neogloboquadrina pachyderma from sediment core RC13-254. https://doi.org/10.1594/PANGAEA.52430
  8. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A5) Opal content and stable oxygen isotope ratios of foramninifera from sediment core RC15-93. https://doi.org/10.1594/PANGAEA.52431
  9. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A6) Opal content and stable oxygen isotope ratios of foraminifera from sediment core RC15-94. https://doi.org/10.1594/PANGAEA.52432
  10. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A7) CaCO3, opal, and stable isotope ratios of Cibicides spp. from sediment core V22-108. https://doi.org/10.1594/PANGAEA.52433
  11. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A8) Opal content of sediment core ELT45.029-TC. https://doi.org/10.1594/PANGAEA.52434
  12. Charles, CD; Froelich, PN; Zibello, MA et al. (1991): (Table A9) Opal content of sediment core ELT49.017-PC. https://doi.org/10.1594/PANGAEA.52435