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| HAL : hal-00674790, version 1 |
| DOI : 10.1029/2010PA002100 |
| Fiche détaillée |  Récupérer au format |
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| Paleoceanography 26 (2011) PA3212 |
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| A mechanism for brief glacial episodes in the Mesozoic greenhouse |
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Yannick Donnadieu 1, 2Gilles Dromart 3 |
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| (17/08/2011) |
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| The Mesozoic, perhaps the longest period of warmth during the Phanerozoic Earth history, has been repeatedly affected by short-lived cold interludes lasting about one million years. While the origin of these cold snaps has been classically attributed to a temporary atmospheric CO(2) drawdown, quantified mechanisms explaining these instabilities of the carbon cycle are still lacking. Based on a climate carbon cycle model, we show that the general demise of carbonate platforms accompanying these short-lived cold interludes is a powerful mechanism capable of generating a fast atmospheric CO2 decrease and a moderate sea level drop associated with ice sheet buildup. The temporary nature of the carbonate production decline explains the relative short time of these cold events but makes it possible to account for ice sheet waxing and waning. |
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| 1 : | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) |
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CNRS : UMR8212 – CEA : DSM/LSCE – Université de Versailles Saint-Quentin-en-Yvelines |
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| 2 : | Institut Pierre-Simon-Laplace (IPSL) |
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CNRS : FR636 – Institut de recherche pour le développement [IRD] – CEA – CNES – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines – Ecole normale supérieure de Paris - ENS Paris |
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| 3 : | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) |
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CNRS : UMR5276 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon |
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| 4 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| 5 : | Biogéosciences |
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CNRS : UMR6282 – Université de Bourgogne |
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| 6 : | IDES (Université Paris-Sud XI) |
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CNRS : UMR8148 |
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| Domaine | : | Planète et Univers/Sciences de la Terre |
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| CARBON-ISOTOPE STRATIGRAPHY – EARLY CRETACEOUS CARBON – ATMOSPHERIC CO2 – PARIS BASIN – ANTARCTIC GLACIATION – GEOCHEMICAL EVIDENCE – JURASSIC TRANSITION – SNOWBALL EARTH – ANOXIC EVENT – PLATFORM |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00674790, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00674790 | |
| oai:hal.archives-ouvertes.fr:hal-00674790 | |
| Contributeur : Margaret Lartaud | |
| Soumis le : Mardi 28 Février 2012, 11:16:53 | |
| Dernière modification le : Mercredi 14 Mars 2012, 10:50:39 | |
