title: Carbon cycling and snowball Earth.
abstract: 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. suggest that a 'hard snowball Earth' state may have been prevented owing to the release of CO(2) 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.
authors.forename: Yves
authors.initials: Y
authors.lastname: Goddéris
authors.forename: Yannick
authors.initials: Y
authors.lastname: Donnadieu
mesh_terms: D001272:Atmosphere / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry; D003080:Cold Temperature; D018534:Earth, Planet; D049690:History, Ancient; D006863:Hydrogen-Ion Concentration; D046448:Ice Cover; D008962:Models, Theoretical; D010313:Partial Pressure; D012623:Seawater / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D012995:Solubility
chemical_list: D017640:Silicates; D002245:Carbon Dioxide