During the last glacial period, climatic variation in the Northern and Southern Hemispheres was evidently linked. Modelling work points to freshwater discharge into the North Atlantic as a driving factor.
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Dokken, T., Nisancioglu, K. Fresh angle on the polar seesaw. Nature 430, 842–843 (2004). https://doi.org/10.1038/430842a
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DOI: https://doi.org/10.1038/430842a
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