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Brief Communication Arising
Nature 456, E8 (18 December 2008) | doi:10.1038/nature07653; Received 28 December 2007; Accepted 17 November 2008
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Carbon cycling and snowball Earth
Yves Goddéris1 & Yannick Donnadieu2
Abstract
Arising from: W. R. Peltier, Y. Liu & J. W. Crowley Nature 450, 813–818 (2007); Peltier & Liu reply
The possibility that Earth witnessed episodes of global glaciation during the latest Precambrian challenges our understanding of the physical processes controlling the Earth's climate. Peltier et al.1 suggest that a 'hard snowball Earth' state may have been prevented owing to the release of CO2 from the oxidation of dissolved organic carbon (DOC) in the ocean as the temperature decreased. Here we show that the model of Peltier et al. is not self-consistent as it implies large fluctuations of the ocean alkalinity content without providing any processes to account for it. Our findings suggest that the hard snowball Earth hypothesis is still valid.
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