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Keigwin, Lloyd D; Boyle, Edward A (1989): Stable isotope and Cd/Ca ratios of Neogloboquadrina pachyderma in high-latitude sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.735611, Supplement to: Keigwin, LD; Boyle, EA (1989): Late Quaternary paleochemistry of high-latitude surface waters. Palaeogeography, Palaeoclimatology, Palaeoecology, 73(1-2), 85-106, https://doi.org/10.1016/0031-0182(89)90047-3

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Abstract:
Recent studies have stressed the role of high latitude nutrient levels and productivity in controlling the carbon isotopic composition of the deep sea and the CO2 content of the atmosphere. We undertook a study of the chemical composition of the polar planktonic foraminifer Neogloboquadrina pachyderma (s., sinistral coiling) from 30 late Holocene samples and 49 down core records from the high-latitude North and South Atlantic Oceans to evaluate the history of sea surface chemical change from glacial to interglacial time. Stable isotopic analysis of coretop samples from the Atlantic, Pacific and Southern Oceans shows no significant correlation between the delta13C of N. pachyderma and either delta13C or PO4 in seawater. Conversely, Cd/Ca ratios in planktonic foraminifera are consistent with the PO4 content of surface waters. The level of maximum glaciation (18,000 yr B.P.), identified by CLIMAP and delta18O, was chosen for mapping. Isopleths of delta18O on N. pachyderma (s.) in the North Atlantic reveal a pattern largely influenced by sea surface temperature (S.S.T.) and generally support the S.S.T. reconstruction of CLIMAP. Differences between the two suggest significantly lower salinity in North Atlantic surface waters at high latitudes than in lower latitudes.
Down core delta13C records of N. pachyderma confirm that low delta13C values occurred in the northeast Atlantic during the latest glacial maximum (Labeyrie and Duplessy, 1985, doi:10.1016/0031-0182(85)90069-0). However, a map of delta13C for the 18,000 yr B.P. level for a much larger region in the North Atlantic shows that minimum N. pachyderma delta13C occurred in temperate waters. N. pachyderma delta13C decreased toward the southwest, reaching a minimum of -1 per mil at 37°N. Despite the variability seen in delta13C records of N. pachyderma, none of our cores show significant temporal variability in Cd/Ca. From the combined Cd/Ca and delta13C data we can see no evidence for an upwelling gyre in the eastern North Atlantic during the latest glacial maximum, nor evidence that the southern and northern oceans had significantly different levels of preformed nutrients than today.
Coverage:
Median Latitude: 27.406516 * Median Longitude: -18.013778 * South-bound Latitude: -54.916667 * West-bound Longitude: -53.900000 * North-bound Latitude: 85.850000 * East-bound Longitude: 164.648000
Date/Time Start: 1965-08-30T00:00:00 * Date/Time End: 1983-07-02T00:00:00
Event(s):
94-606_Site * Latitude: 37.338450 * Longitude: -35.500050 * Date/Time: 1983-07-02T00:00:00 * Penetration: 3.441 m * Recovery: 3.104 m * Location: North Atlantic/FLANK * Campaign: Leg94 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 37 cores; 344.1 m cored; 0 m drilled; 90.2% recovery
AT_II-107_19 * Latitude: -54.916667 * Longitude: -8.716667 * Elevation: -3255.0 m * Campaign: ATII_USA * Basis: Atlantis II (1963) * Method/Device: Gravity corer (GC)
AT_II-107_22 * Latitude: -54.792000 * Longitude: -3.330000 * Elevation: -2768.0 m * Campaign: ATII_USA * Basis: Atlantis II (1963) * Method/Device: Gravity corer (GC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Keigwin, LD; Boyle, EA (1989): (Table IV) Stable carbon and oxygen isotope ratios and temperature estimates of a 18kyr time slice. https://doi.org/10.1594/PANGAEA.735606
  2. Keigwin, LD; Boyle, EA (1989): (Table IIc) Stable oxygen and carbon isotope and Cd/Ca ratios of Neogloboquadrina pachyderma from sediment core AT_II-107_22GGC. https://doi.org/10.1594/PANGAEA.735598
  3. Keigwin, LD; Boyle, EA (1989): (Table VI) Effect of size upon stable isotope ratios in Neogloboquadrina pachyderma (s) from sediment core AT_II-107_22GGC. https://doi.org/10.1594/PANGAEA.735608
  4. Keigwin, LD; Boyle, EA (1989): (Table IIa) Stable oxygen and carbon isotope and Cd/Ca ratios of Neogloboquadrina pachyderma from sediment core CHN83-20. https://doi.org/10.1594/PANGAEA.735600
  5. Keigwin, LD; Boyle, EA (1989): (Table III) Cd/Ca ratios of Neogloboquadrina pachyderma sinistralis from several sediment cores. https://doi.org/10.1594/PANGAEA.735604
  6. Keigwin, LD; Boyle, EA (1989): (Table IIb) Stable oxygen and carbon isotope and Cd/Ca ratios of Neogloboquadrina pachyderma from sediment core KN714-15. https://doi.org/10.1594/PANGAEA.735601
  7. Keigwin, LD; Boyle, EA (1989): (Table VI) Effect of size upon stable isotope ratios and Cd/Ca in Neogloboquadrina pachyderma (s) from sediment core KN714-15. https://doi.org/10.1594/PANGAEA.735609
  8. Keigwin, LD; Boyle, EA (1989): (Table IId) Stable oxygen and carbon isotope of planktonic foramnifera from sediment core V27-114. https://doi.org/10.1594/PANGAEA.735602
  9. Keigwin, LD; Boyle, EA (1989): (Table IId) Stable oxygen and carbon isotope of planktonic foraminifera from sediment core V30-108. https://doi.org/10.1594/PANGAEA.735603