Publication Date:
2008-12-19
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Godderis, Yves -- Donnadieu, Yannick -- England -- Nature. 2008 Dec 18;456(7224):E8; author reply E9-10. doi: 10.1038/nature07653.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19092867" target="_blank"〉PubMed〈/a〉
Keywords:
Atmosphere/chemistry
;
Carbon Dioxide/*analysis/chemistry
;
Cold Temperature
;
*Earth (Planet)
;
History, Ancient
;
Hydrogen-Ion Concentration
;
*Ice Cover
;
Models, Theoretical
;
Partial Pressure
;
Seawater/chemistry
;
Silicates/chemistry
;
Solubility
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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