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Accelerator Mass Spectrometric Radiocarbon Measurements on Foraminifera Shells from Deep-Sea Cores

  • Wallace S Broecker (a1), Mieczyslawa Klas (a1), Elizabeth Clark (a1), Susan Trumbore (a2), Georges Bonani (a2), Willy Wölfli (a2) and Susan Ivy (a2)...

Abstract

Radiocarbon ages determined by the AMS method on hand-picked foraminifera shells are reported. The results allow estimates of the ventilation rate of the deep Atlantic and Pacific Oceans during glacial time. They also extend our knowledge of the chronology of events associated with the transition from full glacial conditions ca 15,000 years ago to full interglacial conditions ca 8000 years ago. This and the previous lists (Broecker et al 1988c) contain all the results obtained as part of this program through the fall of 1989.

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References

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Broecker, WS, Andrée, M, Bonani, G, Mix, A, Klas, M, Wölfli, W and Oeschger, H 1988a Comparison between the radiocarbon ages of coexisting planktonic foraminifera. Paleoceanography 3: 647658.
Broecker, WS, Andrée, M, Bonani, G, Wölfli, W, Oeschger, H, Klas, M, Mix, A and Curry, W 1988b Preliminary estimates for the radiocarbon age of deep water in the glacial ocean. Paleoceanography 3: 659669.
Broecker, WS, Kennett, JP, Flower, BP, Teller, J, Trumbore, S, Bonani, G and Wölfli, W 1989a The routing of Laurentide ice-sheet meltwater during the Younger Dryas cold event. Nature 341: 318321.
Broecker, WS, Klas, M, Beavan, N, Mathieu, G, Mix, A, Andrée, M, Oeschger, H, Wölfli, W, Suter, M, Bonani, G, Hofmann, HJ, Nessi, M and Morenzoni, E 1988c Accelerator mass spectrometry radiocarbon measurements on marine carbonate samples from deep sea cores and sediment traps. Radiocarbon 30(3): 261295.
Broecker, WS, Peng, TH, Trumbore, S, Bonani, G and Wölfli, W, in press, The distribution of radiocarbon in the glacial ocean. Biogeochemical Cycles.
Broecker, WS, Trumbore, S, Bonani, G, Wölfli, W and Klas, M 1989b, Anomalous AMS radiocarbon ages for foraminifera from high-deposition-rate ocean sediments. Radiocarbon 31(2): 157163.
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Oppo, DW and Fairbanks, RG 1987 Variability in the deep and intermediate water circulation of the Atlantic Ocean during the past 25,000 years: Northern Hemisphere modulation of the Southern Ocean. Earth & Planetary Letters 86: 115.
Suter, M, Balzer, R, Bonani, G, Hofmann, HJ, Morenzoni, E, Nessi, M, Wölfli, W, Andrée, M, Beer, J and Oeschger, H 1984 Precision measurements of 14C in AMS - some results and prospects. Nuclear Instruments & Methods B5: 117122.

Accelerator Mass Spectrometric Radiocarbon Measurements on Foraminifera Shells from Deep-Sea Cores

  • Wallace S Broecker (a1), Mieczyslawa Klas (a1), Elizabeth Clark (a1), Susan Trumbore (a2), Georges Bonani (a2), Willy Wölfli (a2) and Susan Ivy (a2)...

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