Ice ages in the North Pacific Ocean and the Southern Ocean were marked by low productivity. Accumulating evidence indicates that strong stratification restricted the supply of nutrients from the deep ocean to the algae of the sunlit surface in these regions.
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References
Gebhardt, H. et al. Paleoceanography 23, 10.1029/2007PA001513 (2008).
Francois, R. et al. Nature 389, 929–935 (1997).
Haug, G. H., Sigman, D. M., Tiedemann, R., Pedersen, T. F. & Sarnthein, M. Nature 401, 779–782 (1999).
Sigman, D. M., Jaccard, S. L. & Haug, G. H. Nature 428, 59–63 (2004).
Jaccard, S. L. et al. Science 308, 1003–1006 (2005).
Jaccard, S. L. et al. Earth Planet. Sci. Lett. 277, 156–165 (2009).
Brunelle, B. G. et al. Paleoceanography 22, 10.1029/2005PA001205 (2007).
Galbraith, E. D. et al. Nature 449, 890–894 (2007).
Keigwin, L. D. Paleoceanography 13, 323–339 (1998).
Sarnthein, M., Grootes, P. M., Kennett, J. P. & Nadeau, M. J. Geophys. Monograph Series 173, 175–196 (2007).
Sarmiento, J. L., Hughes, T. M. C., Stouffer, R. J. & Manabe, S. Nature 393, 245 (1998).
Toggweiler, J. R. & Russell, J. Nature 451, 286 (2008).
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Haug, G., Sigman, D. Polar twins. Nature Geosci 2, 91–92 (2009). https://doi.org/10.1038/ngeo423
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DOI: https://doi.org/10.1038/ngeo423