Testing the 231Pa/230Th paleocirculation proxy: a data versus 2D model comparison
Variations of the Atlantic Meridional Overturning Circulation (AMOC) are believed to have crucially influenced Earth's climate due to its key role in the inter-hemispheric redistribution of heat and carbon. To assess its past strength, the sedimentary 231Pa/230Th proxy has been developed and im...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 October 2011
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| In: |
Geophysical research letters
Year: 2011, Jahrgang: 38, Heft: 20, Pages: 1-7 |
| ISSN: | 1944-8007 |
| DOI: | 10.1029/2011GL049282 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1029/2011GL049282 Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1029/2011GL049282 
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| Verfasserangaben: | Jörg Lippold, Jeanne-Marie Gherardi, and Yiming Luo |
| Zusammenfassung: | Variations of the Atlantic Meridional Overturning Circulation (AMOC) are believed to have crucially influenced Earth's climate due to its key role in the inter-hemispheric redistribution of heat and carbon. To assess its past strength, the sedimentary 231Pa/230Th proxy has been developed and improved but also contested due to its sensitivity to other factors beyond ocean circulation. In order to provide a better basis for the understanding of the Atlantic 231Pa/230Th system, and therefore to shed light on the controversy, we compare new measurements of Holocene sediments from the north Brazilian margin to water column data and the output of a two-dimensional scavenging-circulation model, based on modern circulation patterns and reversible scavenging parameters. We show that sedimentary 231Pa/230Th data from one specific area of the Atlantic are in very good agreement with model results suggesting that sedimentary 231Pa/230Th is predominantly driven by the AMOC. Therefore, 231Pa/230Th represents an appropriate method to reconstruct past AMOC at least qualitatively along the western margin. |
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| Beschreibung: | Im Titel sind "231" und "230" hochgestellt Gesehen am 19.09.2022 |
| Beschreibung: | Online Resource |
| ISSN: | 1944-8007 |
| DOI: | 10.1029/2011GL049282 |