Control mechanisms for the oceanic distribution of silicon isotopes
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 (HAMO...
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ftpubman:oai:pure.mpg.de:item_995287 2023-08-27T04:12:11+02:00 Control mechanisms for the oceanic distribution of silicon isotopes Wischmeyer, A. De La Rocha, C. Maier-Reimer, E. Wolf-Gladrow, D. 2003-08-13 application/pdf http://hdl.handle.net/11858/00-001M-0000-0012-0169-4 http://hdl.handle.net/21.11116/0000-000B-9A43-C eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2002GB002022 http://hdl.handle.net/11858/00-001M-0000-0012-0169-4 http://hdl.handle.net/21.11116/0000-000B-9A43-C info:eu-repo/semantics/openAccess Global Biogeochemical Cycles info:eu-repo/semantics/article 2003 ftpubman https://doi.org/10.1029/2002GB002022 2023-08-02T01:25:55Z 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. Article in Journal/Newspaper Southern Ocean Max Planck Society: MPG.PuRe Southern Ocean Pacific Global Biogeochemical Cycles 17 3 n/a n/a |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Wischmeyer, A. De La Rocha, C. Maier-Reimer, E. Wolf-Gladrow, D. |
spellingShingle |
Wischmeyer, A. De La Rocha, C. Maier-Reimer, E. Wolf-Gladrow, D. Control mechanisms for the oceanic distribution of silicon isotopes |
author_facet |
Wischmeyer, A. De La Rocha, C. Maier-Reimer, E. Wolf-Gladrow, D. |
author_sort |
Wischmeyer, A. |
title |
Control mechanisms for the oceanic distribution of silicon isotopes |
title_short |
Control mechanisms for the oceanic distribution of silicon isotopes |
title_full |
Control mechanisms for the oceanic distribution of silicon isotopes |
title_fullStr |
Control mechanisms for the oceanic distribution of silicon isotopes |
title_full_unstemmed |
Control mechanisms for the oceanic distribution of silicon isotopes |
title_sort |
control mechanisms for the oceanic distribution of silicon isotopes |
publishDate |
2003 |
url |
http://hdl.handle.net/11858/00-001M-0000-0012-0169-4 http://hdl.handle.net/21.11116/0000-000B-9A43-C |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Global Biogeochemical Cycles |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2002GB002022 http://hdl.handle.net/11858/00-001M-0000-0012-0169-4 http://hdl.handle.net/21.11116/0000-000B-9A43-C |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2002GB002022 |
container_title |
Global Biogeochemical Cycles |
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17 |
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3 |
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1775356050746114048 |