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

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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Figure 1: Location of ODP Site 1090, world ocean surface nitrate concentrations, and wind direction.
Figure 2: Global ice volume, dust and iron deposition in the Southern Ocean since 4 Myr ago.
Figure 3: Evolution of global ice volume, and Southern Ocean dust and iron variability through the Pliocene and Pleistocene epochs.

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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).

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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.

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Correspondence to Alfredo Martínez-Garcia.

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Supplementary Information

This file contains a Supplementary Discussion, Supplementary Figures 1-6 with legends and additional references. (PDF 6313 kb)

Supplementary Data

This file contains the data reported in Figures 2 and 3 (ODP Site 1090 Fe MAR, Dust MAR and n-alkanes MAR). (XLS 562 kb)

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Martínez-Garcia, A., Rosell-Melé, A., Jaccard, S. et al. Southern Ocean dust–climate coupling over the past four million years. Nature 476, 312–315 (2011). https://doi.org/10.1038/nature10310

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