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Glacial–interglacial stability of ocean pH inferred from foraminifer dissolution rates

Nature volume 416, pages 70–73 (2002)Cite this article

Abstract

The pH of the ocean is controlled by the chemistry of calcium carbonate. This system in turn plays a large role in regulating the CO2 concentration of the atmosphere on timescales of thousands of years and longer. Reconstructions of ocean pH and carbonate-ion concentration are therefore needed to understand the ocean's role in the global carbon cycle. During the Last Glacial Maximum (LGM), the pH of the whole ocean is thought to have been significantly more basic1, as inferred from the isotopic composition of boron incorporated into calcium carbonate shells, which would partially explain the lower atmospheric CO2 concentration at that time. Here we reconstruct carbonate-ion concentration—and hence pH—of the glacial oceans, using the extent of calcium carbonate dissolution observed in foraminifer faunal assemblages as compiled in the extensive global CLIMAP data set2. We observe decreased carbonate-ion concentrations in the glacial Atlantic Ocean, by roughly 20 µmol kg-1, while little change occurred in the Indian and Pacific oceans relative to today. In the Pacific Ocean, a small (5 µmol kg-1) increase occurred below 3,000 m. This rearrangement of ocean pH may be due to changing ocean circulation from glacial to present times, but overall we see no evidence for a shift in the whole-ocean pH as previously inferred from boron isotopes1.

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Figure 1: Foraminifer abundance in core-top sediments versus sea surface temperature and carbonate-ion saturation at the sea floor.
Figure 2: Vertical profiles of carbonate-ion concentration in the modern and glacial Atlantic and combined Indian and Pacific oceans.
Figure 3: Vertical profiles of carbonate-ion saturation (ΔCO32-) in three regions for the modern and Last Glacial Maximum.

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References

  1. Sanyal, A., Hemming, N. G., Hanson, N. & Broecker, W. S. Evidence for a higher pH in the glacial ocean from boron isotopes in foraminifera. Nature 373, 234–236 (1995).

    Article  ADS  CAS  Google Scholar 

  2. CLIMAP Project Members. Seasonal reconstruction of the Earth's surface at the last glacial maximum. Geol. Soc. Am. Map Chart Ser. MC-36, 1–18 (1981).

    Google Scholar 

  3. Mix, A. C. Influence of productivity variations on long-term atmospheric CO2. Nature 337, 541–544 (1989).

    Article  ADS  CAS  Google Scholar 

  4. Ravelo, A. C., Fairbanks, R. G. & Philander, S. G. H. Reconstructing topical Atlantic hydrography using planktonic foraminifera and an ocean model. Paleoceanography 5, 409–431 (1990).

    Article  ADS  Google Scholar 

  5. Prell, W. L. The stability of low-latitude sea-surface temperatures: An evaluation of the CLIMAP reconstruction with emphasis on the positive SST anomalies. (Report TR025, Department of Energy, Washington DC, 1985).

  6. Millero, F. J. The effect of pressure on the solubility of minerals in water and seawater. Geochim. Cosmochim. Acta 46, 11–22 (1982).

    Article  ADS  CAS  Google Scholar 

  7. Mucci, A. The solubility of calcite and aragonite in seawater at various salinities, temperatures, and one atmosphere total pressure. Am. J. Sci. 283, 780–799 (1983).

    Article  ADS  CAS  Google Scholar 

  8. Duplessey, J. C. et al. Deep water source variations during the last climatic cycle and their impact on the global deep water circulation. Paleoceanography 3, 343–360 (1988).

    Article  ADS  Google Scholar 

  9. Oppo, D. W. & Horowitz, M. Glacial deep water geometry: South Atlantic benthic foraminiferal Cd/Ca and δ13C evidence. Paleoceanography 15, 147–160 (2000).

    Article  ADS  Google Scholar 

  10. Yu, E.-F., Bacon, M. P. & Francois, R. Similar rates of modern and last glacial ocean thermohaline circulation inferred from radiochemical data. Nature 379, 689–694 (1996).

    Article  ADS  CAS  Google Scholar 

  11. Winguth, A., Archer, D. & Maier-Reimer, E. in Inverse Methods in Global Biogeochemical Cycles (eds Kasibhatla, P. et al.) (AGU Press, Washington DC, 2000).

    Google Scholar 

  12. Kennett, J. P. & Ingram, B. L. A 20,000 year record of ocean circulation and climate change from the Santa Barbara Basin. Nature 377, 510–514 (1995).

    Article  ADS  CAS  Google Scholar 

  13. Ganeshram, R. S., Pedersen, T. F., Calvert, S. E. & Murray, J. W. Large changes in oceanic nutrient inventories from glacial to interglacial periods. Nature 376, 755–758 (1995).

    Article  ADS  CAS  Google Scholar 

  14. Altabet, M. A., Francoise, R., Murray, D. M. & Prell, W. L. Climate-related variations in denitrification in the Arabian Sea from sediment 15N/14N ratios. Nature 373, 506–509 (1995).

    Article  ADS  CAS  Google Scholar 

  15. Archer, D., Winguth, A., Lea, D. & Mahowald, N. What caused the glacial/interglacial atmospheric pCO2 cycles? Rev. Geophys. 38, 159–189 (2000).

    Article  ADS  CAS  Google Scholar 

  16. Farrell, J. W. & Prell, W. L. Climate change and CaCO3 preservation: an 800,000 year bathymetric reconstruction from the central equatorial Pacific Ocean. Paleoceanography 4, 447–466 (1989).

    Article  ADS  Google Scholar 

  17. Peterson, L. C. & Prell, W. L. in The Carbon Cycle and Atmospheric Carbon Dioxide: Natural Variations Archean to Present (eds Sundquist, E. T. & Broecker, W. S.) 251–269 (American Geophysical Union, Washington DC, 1985).

    Google Scholar 

  18. Curry, W. B. & Lohmann, G. P. in The Carbon Cycle and Atmospheric Carbon Dioxide: Natural Variations Archean to Present (eds Sundquist, E. T. & Broecker, W. S.) 285–301 (American Geophysical Union, Washington DC, 1985).

    Google Scholar 

  19. Howard, W. R. & Prell, W. L. Late Quaternary CaCO3 production and preservation in the Southern Ocean: Implications for oceanic and atmospheric carbon cycling. Paleoceanography 9, 453–482 (1994).

    Article  ADS  Google Scholar 

  20. Crowley, T. J. in The Carbon Cycle and Atmospheric Carbon Dioxide: Natural Variations Archean to Present (eds Sundquist, E. T. & Broecker, W. S.) 271–284 (American Geophysical Union, Washington DC, 1985).

    Google Scholar 

  21. Archer, D. & Maier-Reimer, E. Effect of deep-sea sedimentary calcite preservation on atmospheric CO2 concentration. Nature 367, 260–263 (1994).

    Article  ADS  CAS  Google Scholar 

  22. Archer, D. An atlas of the distribution of calcium carbonate in deep sea sediments. Glob. Biogeochem. Cycles 10, 159–174 (1996).

    Article  ADS  CAS  Google Scholar 

  23. Overpeck, J. T., Webb, T. & Prentice, I. C. Quantitative interpretation of fossil pollen spectra: dissimilarity coefficients and the method of modern analogs. Quat. Res. 23, 87–108 (1985).

    Article  Google Scholar 

  24. Emerson, S. & Bender, M. L. Carbon fluxes at the sediment water interface of the deep sea: Calcium carbonate preservation. J. Mar. Res. 39, 139–162 (1981).

    CAS  Google Scholar 

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Acknowledgements

We thank D. Lea, S. Lehman, R. Toggweiler and D. Sigman for helpful suggestions.

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Authors and Affiliations

  1. NOAA Paleoclimatology Program and University of Colorado, 325 Broadway, Boulder, 80303, Colorado, USA

    David M. Anderson

  2. Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Ave., Chicago, 60637, Illinois, USA

    David Archer

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Correspondence to David M. Anderson.

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Anderson, D., Archer, D. Glacial–interglacial stability of ocean pH inferred from foraminifer dissolution rates. Nature 416, 70–73 (2002). https://doi.org/10.1038/416070a

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