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Laboratoire d'études en Géophysique et océanographie spatiales |  |
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Laboratoire d'études en Géophysique et océanographie spatiales | |
| HAL : hal-00480657, version 1 |
| DOI : 10.1038/NGEO818 |
| Fiche détaillée |  Récupérer au format |
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| Nature geoscience 3 (2010) 252-256 |
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| On the importance of hydrothermalism to the oceanic dissolved iron inventory. |
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| Alessandro Tagliabue 1Laurent Bopp 1 |
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| (2010) |
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| Iron limits phytoplankton growth and hence the biological carbon pump in the Southern Ocean. Models assessing the impacts of iron on the global carbon cycle generally rely on dust input and sediment resuspension as the predominant sources. Although it was previously thought that most iron from deep-ocean hydrothermal activity was inaccessible to phytoplankton because of the formation of particulates, it has been suggested that iron from hydrothermal activity may be an important source of oceanic dissolved iron. Here we use a global ocean model to assess the impacts of an annual dissolved iron flux of approximately 9 108 mol, as estimated from regional observations of hydrothermal activity, on the dissolved iron inventory of the world's oceans. We find the response to the input of hydrothermal dissolved iron is greatest in the Southern Hemisphere oceans. In particular, observations of the distribution of dissolved iron in the Southern Ocean3 (Chever et al., manuscript in preparation; Bowie et al., manuscript in preparation) can be replicated in our simulations only when our estimated iron flux from hydrothermal sources is included. As the hydrothermal flux of iron is relatively constant over millennial timescales, we propose that hydrothermal activity can buffer the oceanic dissolved iron inventory against shorter-term fluctuations in dust deposition. |
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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 : | Antartic Climate and Ecosystems CRC |
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Antartic Climate and Ecosytsems |
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| 3 : | School of Chemistry (ACROSS) |
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University of Tasmania |
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| 4 : | Laboratoire des Sciences de l'Environnement Marin (LEMAR) |
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Institut Universitaire Européen de la Mer (IUEM) – Université de Bretagne Occidentale [UBO] – CNRS : UMR6539 – Institut de Recherche pour le Développement |
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| 5 : | Laboratoire de physique des océans (LPO) |
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CNRS : UMR6523 – Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) – INSU – Université de Bretagne Occidentale [UBO] – Institut de recherche pour le développement [IRD] – Institut Universitaire Européen de la Mer (IUEM) |
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| 6 : | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
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CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| Domaine | : | Planète et Univers/Océan, Atmosphère |
| hal-00480657, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00480657 | |
| oai:hal.archives-ouvertes.fr:hal-00480657 | |
| Contributeur : Eva Bucciarelli | |
| Soumis le : Mardi 4 Mai 2010, 16:38:27 | |
| Dernière modification le : Mardi 4 Mai 2010, 16:38:27 | |
