Abrupt Color Changes in Isotope Stage 5 in North Atlantic Deep Sea Cores: Implications for Rapid Change of Climate-Driven Events

  • Gerard Bond
  • Wallace Broecker
  • Rusty Lotti
  • Jerry McManus
Part of the NATO ASI Series book series (volume 3)

Summary

Digitized records of optical density in many North Atlantic cores exhibit rapid changes from lighter to darker extremes, typically within less than 200 years, at the 5d/5e, 5b/5c and 4/5 boundaries. In cores from DSDP site 609 the changes from lighter to darker color coincide with increases in relative abundance of N. pachyderma (l. c.), with increases in abundances of lithic grains and with decreases in carbonate content. The rapid changes to dark color, therefore, are climate-driven and correspond to a lowering of sea surface temperatures and to increases in amounts of ice rafted debris relative to biogenic carbonate. At the 5d/5c boundary, δ18O in N. pachvderma (l.c.) increases abruptly with the change to darker sediment as expected for cooler sea surface temperatures. At the 4/5 boundary, however, δ18O decreases with the change to darker sediment and cooler sea surface temperatures, suggesting that a layer of fresh surface water was present in the North Atlantic at that time.

Keywords

Quartz Sedimentation Silt Holocene Pleistocene 

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References

  1. Bond GC, Kominz MA, Broecker WS, Klas M, and McManus J (1991a) Do color variations in North Atlantic deep-sea cores record Holocene and Pleistocene climatic changes on Milankovitch and sub-Milankovitch scales?: Geological Society of America, Abstracts with programs 22: 78.Google Scholar
  2. Bond GC, Heinrich H, Andrews J, Jantschik R, Huon S, McManus J, Tedesco K, and Broecker W (in review) Evidence for massive discharges of icebergs carrying detrital carbonate into the glacial Northern Atlantic (submitted to Nature).Google Scholar
  3. Broecker WS, Bond G, Klas M, Bonani G, and Wolfli W (1990) A salt oscillator in the glacial North Atlantic? 1. The Concept, Paleoceanography 5: 469–477.CrossRefGoogle Scholar
  4. Broecker WS, Bond GC, Klas M, Clark E, and McManus J (1992) Origin of the Northern Atlantic’s Henrich events, Climate Dynamics 6: 265–273.CrossRefGoogle Scholar
  5. Dansgaard W, Clausen HB, Gundestrup N, Hammer CU, Johnsen SF, Kristinsdottir PM and Reeh N (1982) A new Greenland deep ice core, Science 218: 1273–1277.CrossRefGoogle Scholar
  6. Keigwin LD, Jones GA, and Lehman SJ (1991) Deglacial meltwater discharge, North Atlantic deep circulation, and abrupt climate change, Journal of Geophysical Research 96(C9):811–16,826.CrossRefGoogle Scholar
  7. Martinson DG, Pisias NG, Hays JD, Imbrie J, Moore TC Jr, and Shackleton NJ (1987) Age dating and the orbital theory of the ice ages: development of a high-resolution 0 to 300,000-year chronostratigraphy, Quaternary Research 27:1–29.CrossRefGoogle Scholar
  8. Mclntyre A, Ruddiman WF, and Jantzen R (1972) Southward penetrations of the North Atlantic Polar Front: faunal and floral evidence of large-scale surface water mass movements over the last 225,000 years, Deep-Sea Research 19: 61–77.Google Scholar
  9. Ruddiman WF, and Mclntyre A (1981) Oceanic mechanisms for amplification of the 23,000-year ice-volume cycle, Science 212: 617–627.CrossRefGoogle Scholar
  10. Ruddiman WF, Raymo ME, Martinson DG, Clement BM, and Backman J (1989) Northern Hemisphere ice sheets and North Atlantic Ocean paleoceanography 4(4): 353–412.Google Scholar
  11. Smythe FW Jr, Ruddiman WF, and Lumsden DN (1985) Ice-rafted evidence of long-term North Atlantic circulation, Marine Geology 64: 131–141.CrossRefGoogle Scholar
  12. Streeter S, and Shackleton NJ (1979) Paleocirculation of the Deep North Atlantic: 150,000-year record of benthic foraminifera and oxygen-18, Science 203:168–170Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • Gerard Bond
    • 1
  • Wallace Broecker
    • 1
  • Rusty Lotti
    • 1
  • Jerry McManus
    • 1
  1. 1.Lamont-Doherty Geological Observatory of Columbia UniversityPalisadesUSA

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