The quirky relationship between seawater temperature and density is invoked to account for how, during past global cooling, the high-latitude oceans locked up atmospheric CO2 and produced further cooling.
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Francois, R. Cool stratification. Nature 428, 31–32 (2004). https://doi.org/10.1038/428031a
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DOI: https://doi.org/10.1038/428031a
