Low atmospheric carbon dioxide concentrations during glacial periods must have been accompanied by changes in surface-ocean carbonate chemistry. But it is unclear whether concurrent changes in the deep sea contributed to the glacial carbon dioxide decline.
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Zeebe, R., Marchitto, T. Atmosphere and ocean chemistry. Nature Geosci 3, 386–387 (2010). https://doi.org/10.1038/ngeo882
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DOI: https://doi.org/10.1038/ngeo882
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