Carbon dioxide release from the North Pacific abyss during the last deglaciation (original) (raw)

Nature volume 449, pages 890–893 (2007)Cite this article

Abstract

Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ocean during glacial periods1,2,3,4,5, but direct evidence regarding the ventilation and respired carbon content of the glacial deep ocean is sparse and often equivocal6. Here we present sedimentary geochemical records from sites spanning the deep subarctic Pacific that—together with previously published results7—show that a poorly ventilated water mass containing a high concentration of respired carbon dioxide occupied the North Pacific abyss during the Last Glacial Maximum. Despite an inferred increase in deep Southern Ocean ventilation during the first step of the deglaciation (18,000–15,000 years ago)4,8, we find no evidence for improved ventilation in the abyssal subarctic Pacific until a rapid transition ∼14,600 years ago: this change was accompanied by an acceleration of export production from the surface waters above but only a small increase in atmospheric carbon dioxide concentration8. We speculate that these changes were mechanistically linked to a roughly coeval increase in deep water formation in the North Atlantic9,10,11, which flushed respired carbon dioxide from northern abyssal waters, but also increased the supply of nutrients to the upper ocean, leading to greater carbon dioxide sequestration at mid-depths and stalling the rise of atmospheric carbon dioxide concentrations. Our findings are qualitatively consistent with hypotheses invoking a deglacial flushing of respired carbon dioxide from an isolated, deep ocean reservoir1,2,3,4,5,12, but suggest that the reservoir may have been released in stages, as vigorous deep water ventilation switched between North Atlantic and Southern Ocean source regions.

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Acknowledgements

We thank A. de Vernal, J. Leduc, P. Dulski, M. Soon and K. Gordon for analytical assistance, and J. Sarmiento, R. Toggweiler, M. Kienast, L. Keigwin and S. Calvert for intellectual and practical support. R. Schlitzer’s program Ocean Data View was used to generate Fig. 1. E.D.G., T.F.P. and R.F. were supported by the Natural Sciences and Engineering Research Council of Canada and the Canadian Foundation for Climate and Atmospheric Sciences, S.L.J. by a Swiss National Foundation post-doctoral fellowship, D.M.S. by US NSF, and by BP and Ford Motor Company through the Princeton Carbon Mitigation Initiative, and G.H.H. by Deutsche Forschungsgemeinschaft.

Author Contributions E.D.G. and S.L.J. contributed equally to this work. T.F.P. and G.H.H. initiated and guided the project. E.D.G. prepared samples and picked foraminifera from ODP Site 887, S.L.J. prepared and analysed samples from site ODP Site 882. R.F. and S.L.J. made the 230Th measurements and J.R.S. made the radiocarbon measurements. M.C. contributed to the 14C analysis. E.D.G., S.L.J. and D.M.S. wrote the paper. All authors discussed the results and commented on the manuscript.

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Author notes

  1. Eric D. Galbraith
    Present address: Present address: Department of Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey 08544, USA.,

Authors and Affiliations

  1. Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada,
    Eric D. Galbraith, Samuel L. Jaccard & Roger Francois
  2. School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada ,
    Thomas F. Pedersen
  3. Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA,
    Daniel M. Sigman
  4. Department of Earth Sciences, Geological Institute, ETH Zürich, Zürich CH-8092, Switzerland,
    Samuel L. Jaccard & Gerald H. Haug
  5. Department of Ocean Sciences, University of California, Santa Cruz, California 95064, USA,
    Mea Cook
  6. Department of Earth System Science, University of California, Irvine, California 92697, USA,
    John R. Southon

Authors

  1. Eric D. Galbraith
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  2. Samuel L. Jaccard
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  3. Thomas F. Pedersen
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  4. Daniel M. Sigman
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  5. Gerald H. Haug
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  6. Mea Cook
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  7. John R. Southon
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  8. Roger Francois
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Correspondence toEric D. Galbraith.

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Supplementary information

Supplementary Information

The file Supplementary Methods; Supplementary Figures S1-S4 and Legends; Supplementary Tables S1-S2 and additional references. This file contains additional notes related to the main text, regarding modern North Pacific hydrography, foraminiferal sampling methods, reservoir ages, comparison to previous Pacific radiocarbon measurements, calcium carbonate stratigraphy, foraminiferal carbon isotope interpretations, and 230-Th results, with four supplementary figures. It also contains tables of the foraminiferal 14C measurements and age constraints for ODP 887. (PDF 671 kb)

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Galbraith, E., Jaccard, S., Pedersen, T. et al. Carbon dioxide release from the North Pacific abyss during the last deglaciation.Nature 449, 890–893 (2007). https://doi.org/10.1038/nature06227

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Editorial Summary

Out of the abyss

Atmospheric carbon dioxide concentrations have varied significantly over the past two million years — they were relatively low during cold 'glacial' periods but high during the warm interglacial periods. The processes responsible for these variations remain obscure: it is thought that carbon may have been stored in the deep ocean during glacials, when deep water circulation was sluggish, and released during the transition into interglacial periods, as ventilation of the deep ocean increased, but direct evidence from this period is scarce. Galbraith et al. now use geochemical records from ocean sediment cores to shed light on the matter. They show that a poorly ventilated water mass that was rich in respired carbon dioxide occupied the North Pacific abyss during the Last Glacial Maximum, and that ventilation of the abyss increased during deglaciation, releasing the stored carbon dioxide.