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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
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

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
Direitos:  Copyright 2011 by the American Geophysical Union.


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