Letter

Southern Ocean dust–climate coupling over the past four million years

  • Nature volume 476, pages 312315 (18 August 2011)
  • doi:10.1038/nature10310
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Abstract

Dust has the potential to modify global climate by influencing the radiative balance of the atmosphere and by supplying iron and other essential limiting micronutrients to the ocean1,2. Indeed, dust supply to the Southern Ocean increases during ice ages, and ‘iron fertilization’ of the subantarctic zone may have contributed up to 40 parts per million by volume (p.p.m.v.) of the decrease (80–100 p.p.m.v.) in atmospheric carbon dioxide observed during late Pleistocene glacial cycles3,4,5,6,7. So far, however, the magnitude of Southern Ocean dust deposition in earlier times and its role in the development and evolution of Pleistocene glacial cycles have remained unclear. Here we report a high-resolution record of dust and iron supply to the Southern Ocean over the past four million years, derived from the analysis of marine sediments from ODP Site 1090, located in the Atlantic sector of the subantarctic zone. The close correspondence of our dust and iron deposition records with Antarctic ice core reconstructions of dust flux covering the past 800,000 years (refs 8, 9) indicates that both of these archives record large-scale deposition changes that should apply to most of the Southern Ocean, validating previous interpretations of the ice core data. The extension of the record beyond the interval covered by the Antarctic ice cores reveals that, in contrast to the relatively gradual intensification of glacial cycles over the past three million years, Southern Ocean dust and iron flux rose sharply at the Mid-Pleistocene climatic transition around 1.25 million years ago. This finding complements previous observations over late Pleistocene glacial cycles5,8,9, providing new evidence of a tight connection between high dust input to the Southern Ocean and the emergence of the deep glaciations that characterize the past one million years of Earth history.

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References

  1. 1.

    , & Iron in Antarctic waters. Nature 345, 156–158 (1990)

  2. 2.

    Glacial-interglacial CO2 change: the iron hypothesis. Paleoceanography 5, 1–13 (1990)

  3. 3.

    , , , & Effect of iron supply on Southern Ocean CO2 uptake and implications for glacial atmospheric CO2. Nature 407, 730–733 (2000)

  4. 4.

    , , & Role of marine biology in glacial-interglacial CO2 cycles. Science 308, 74–78 (2005)

  5. 5.

    et al. Links between iron supply, marine productivity, sea surface temperature, and CO2 over the last 1.1 Ma. Paleoceanography 24 PA1207 10.1029/2008PA001657 (2009)

  6. 6.

    , & The polar ocean and glacial cycles in atmospheric CO2 concentration. Nature 466, 47–55 (2010)

  7. 7.

    , & Carbon dioxide effects of Antarctic stratification, North Atlantic Intermediate Water formation, and subantarctic nutrient drawdown during the last ice age: diagnosis and synthesis in a geochemical box model. Glob. Biogeochem. Cycles 24 GB4023 10.1029/2010gb003790 (2010)

  8. 8.

    et al. Dust-climate couplings over the past 800,000 years from the EPICA Dome C ice core. Nature 452, 616–619 (2008)

  9. 9.

    et al. Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles. Nature 440, 491–496 (2006)

  10. 10.

    et al. Mesoscale iron enrichment experiments 1993–2005: synthesis and future directions. Science 315, 612–617 (2007)

  11. 11.

    Variation of atmospheric CO2 by ventilation of the ocean's deepest water. Paleoceanography 14, 571–588 (1999)

  12. 12.

    et al. Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period. Nature 389, 929–935 (1997)

  13. 13.

    et al. Increased biological productivity and export production in the glacial Southern Ocean. Nature 378, 675–680 (1995)

  14. 14.

    et al. The Southern Ocean biological response to aeolian iron deposition. Science 317, 1067–1070 (2007)

  15. 15.

    , & Silicic acid leakage from the Southern Ocean: a possible explanation for glacial atmospheric pCO2. Glob. Biogeochem. Cycles 16 1031 10.1029/2001GB001442 (2002)

  16. 16.

    , , & Lowering of glacial atmospheric CO2 in response to changes in oceanic circulation and marine biogeochemistry. Paleoceanography 22 PA4202 10.1029/2006PA001380 (2007)

  17. 17.

    , , & Quantitative interpretation of atmospheric carbon records over the last glacial termination. Global Biogeochem. Cycles 19 GB4020 10.1029/2004GB002345 (2005)

  18. 18.

    Implications of the glacial CO2 “iron hypothesis” for Quaternary climate change. Geochem. Geophys. Geosyst. 4 1076 10.1029/2003GC000563 (2003)

  19. 19.

    & Deep ice cores: the need for going back in time. Quat. Sci. Rev. 29, 3683–3689 (2010)

  20. 20.

    , & Biogenic lipids in particulates from the lower atmosphere over the eastern Atlantic. Nature 267, 682–685 (1977)

  21. 21.

    , , , & Covariant glacial-interglacial dust fluxes in the equatorial Pacific and Antarctica. Science 320, 93–96 (2008)

  22. 22.

    , , & Late Pliocene Greenland glaciation controlled by a decline in atmospheric CO2 levels. Nature 454, 1101–1105 (2008)

  23. 23.

    , & Polar ocean stratification in a cold climate. Nature 428, 59–63 (2004)

  24. 24.

    et al. Greatly expanded tropical warm pool and weakened Hadley Circulation in the early Pliocene. Science 323, 1714–1718 (2009)

  25. 25.

    , , , & Subpolar link to the emergence of the modern equatorial Pacific Cold Tongue. Science 328, 1550–1553 (2010)

  26. 26.

    , , , & Atmospheric carbon dioxide concentration across the mid-Pleistocene transition. Science 324, 1551–1554 (2009)

  27. 27.

    , , & Tropical ocean temperatures over the past 3.5 million years. Science 328, 1530–1534 (2010)

  28. 28.

    & A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records. Paleoceanography 20 PA1003 10.1029/2004PA001071 (2005)

  29. 29.

    et al. The middle Pleistocene transition: characteristics, mechanisms, and implications for long-term changes in atmospheric pCO2. Quat. Sci. Rev. 25, 3150–3184 (2006)

  30. 30.

    & Plio/Pleistocene changes in the main biogenic silica carrier in the Southern Ocean, Atlantic Sector. Mar. Geol. 252, 100–110 (2008)

  31. 31.

    , & Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. Org. Geochem. 38, 1002–1007 (2007)

  32. 32.

    & Application of microwave-assisted extraction to the analysis of biomarker climate proxies in marine sediments. Org. Geochem. 34, 1517–1523 (2003)

  33. 33.

    & New evidence for changes in Plio-Pleistocene deep water circulation from Southern Ocean ODP Leg 177 Site 1090. Palaeogeogr. Palaeoclimatol. Palaeoecol. 182, 197–220 (2002)

  34. 34.

    & Plio-Pleistocene diatom biostratigraphy from ODP Leg 177, Atlantic sector of the Southern Ocean. Mar. Micropaleontol. 45, 225–268 (2002)

  35. 35.

    et al. Southern Ocean paleoceanography. Sites 1088-1094. Proc. ODP Init. Rep. 177, (1999)

  36. 36.

    Physical Properties Handbook: A Guide to the Shipboard Measurement of Physical Properties of Deep-Sea Cores (ODP Tech. Note 26, 1997)

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Acknowledgements

We thank S. Stefer for performing the XRF scanner measurements at the University of Bremen; and I. Vöge for assistance in the ICP-SFMS analysis at the Alfred Wegener Institute for Polar and Marine Research. We thank the Integrated Ocean Drilling Program for providing the samples used in this study. This research used data acquired at the XRF Core Scanner Laboratory at the MARUM – Center for Marine Environmental Sciences, University of Bremen. Support for this work was provided by the Spanish Ministry of Science and Innovation (MICINN), the European Commission, and the Deutsche Forschungsgemeinschaft (DFG).

Author information

Affiliations

  1. Geological Institute, ETH Zürich, Zürich 8092, Switzerland

    • Alfredo Martínez-Garcia
    • , Samuel L. Jaccard
    •  & Gerald H. Haug
  2. DFG-Leibniz Center for Surface Process and Climate Studies, Institute for Geosciences, Potsdam University, Potsdam D-14476, Germany

    • Alfredo Martínez-Garcia
    •  & Gerald H. Haug
  3. Institut de Ciència i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona, Bellaterra 08193, Catalonia, Spain

    • Alfredo Martínez-Garcia
    •  & Antoni Rosell-Melé
  4. Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Catalonia, Spain

    • Antoni Rosell-Melé
  5. College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA

    • Antoni Rosell-Melé
  6. School of GeoSciences, The University of Edinburgh, Edinburgh EH9 3JW, UK

    • Walter Geibert
  7. Scottish Association for Marine Science (SAMS), Scottish Marine Laboratory, Oban, Argyll PA37 1QA, UK

    • Walter Geibert
  8. Department of Geosciences, Princeton University, New Jersey 08544, USA

    • Daniel M. Sigman

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Contributions

A.M.-G., A.R.-M. and G.H.H. designed the study. A.M.-G. performed the n-alkane and elemental ICP-SFMS analysis and wrote the first version of the manuscript. G.H.H. and S.L.J organized and supervised the XRF scanning at the University of Bremen. W.G. organized and supervised the ICP-SFMS elemental analysis at the Alfred Wegener Institute. All the authors contributed to the interpretation of the data and provided significant input to the final manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Alfredo Martínez-Garcia.

Supplementary information

PDF files

  1. 1.

    Supplementary Information

    This file contains a Supplementary Discussion, Supplementary Figures 1-6 with legends and additional references.

Excel files

  1. 1.

    Supplementary Data

    This file contains the data reported in Figures 2 and 3 (ODP Site 1090 Fe MAR, Dust MAR and n-alkanes MAR).

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