Data/hora: 01/06/2024 13:45:09

Provedor de dados: | 5
País: | France
Título: | Testing the Pa-231/Th-230 paleocirculation proxy: A data versus 2D model comparison
Autores: | Lippold, Jorg; Gherardi, Jeanne Marie; Luo, Yiming.
Data: | 2011-10
Ano: | 2011
Palavras-chave: | 231Pa/230Th; Atlantic Meridional Overturning Circulation; Holocene; Deep sea sediments.
Resumo: | 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 Pa-231/Th-230 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 Pa-231/Th-230 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 Pa-231/Th-230 data from one specific area of the Atlantic are in very good agreement with model results suggesting that sedimentary Pa-231/Th-230 is predominantly driven by the AMOC. Therefore, Pa-231/Th-230 represents an appropriate method to reconstruct past AMOC at least qualitatively along the western margin.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00215/32576/31045.pdf

DOI:10.1029/2011GL049282

https://archimer.ifremer.fr/doc/00215/32576/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2011-10 , Vol. 38 , N. L20603 , P. 1-7

Fonte:

Copyright 2011 by the American Geophysical Union.

info:eu-repo/semantics/openAccess

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