Control mechanisms for the oceanic distribution of silicon isotopes

André G. Wischmeyer 1 Christina De La Rocha 1, 2 Ernst Maier-Reimer 3 Dieter Wolf-Gladrow 1
1 AWI - Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
2 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
3 MPI-M - Max-Planck-Institut für Meteorologie
Abstract : Marine diatoms take up silicic acid for the buildup of their opaline shells and discriminate against the heavier silicon isotope. For the first time, the overall oceanic distribution of silicon isotopes has been estimated by integration of the Hamburg Model of the Ocean Carbon Cycle, version 4 (HAMOCC4). It is shown that the relationship between the silicic acid concentration and its silicon isotope composition is not a simple Rayleigh distillation curve. Only the Southern Ocean and the equatorial Pacific show a clear functional dependency similar to the Rayleigh distillation curve. Model results can be used to predict opal silicon isotope compositions in the sediment and constrain the use of silicon isotopes as a proxy for silicic acid utilization. Owing to the structure of the Pacific current system, it might be valid to apply a relationship between surface silicic acid concentrations and the silicon isotope signal in the equatorial Pacific sediments.
Type de document :
Article dans une revue
Global Biogeochemical Cycles, American Geophysical Union, 2003, 17 (3), pp.1083. 〈10.1029/2002GB002022〉
Liste complète des métadonnées

Littérature citée [36 références]  Voir  Masquer  Télécharger
http://hal.univ-brest.fr/hal-00467272
Contributeur : Christina De La Rocha <>
Soumis le : jeudi 12 août 2010 - 14:44:33
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24
Document(s) archivé(s) le : samedi 13 novembre 2010 - 02:24:43

Fichier

Wischmeyer_et_al_2003.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

IUEM | IRD | UNIV-BREST | LEMAR | THESES_IUEM | CMM

Citation

André G. Wischmeyer, Christina De La Rocha, Ernst Maier-Reimer, Dieter Wolf-Gladrow. Control mechanisms for the oceanic distribution of silicon isotopes. Global Biogeochemical Cycles, American Geophysical Union, 2003, 17 (3), pp.1083. 〈10.1029/2002GB002022〉. 〈hal-00467272〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

455

Téléchargements de fichiers

241

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD