| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
The large-scale evolution of neodymium isotopic composition in the global modern and Holocene ocean revealed from seawater and archive data
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| Autores: |
Tachikawa, Kazuyo
Arsouze, Thomas
Bayon, Germain
Bory, Aloys
Colin, Christophe
Dutay, Jean-claude
Frank, Norbert
Giraud, Xavier
Gourlan, Alexandra T.
Jeandel, Catherine
Lacan, Francois
Meynadier, Laure
Montagna, Paolo
Piotrowski, Alexander M.
Plancherel, Yves
Puceat, Emmanuelle
Roy-barman, Matthieu
Waelbroeck, Claire
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| Data: |
2017-05
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| Ano: |
2017
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| Palavras-chave: |
Nd isotopes
Water mass tracer
Data compilation
Predicted seawater epsilon(Nd)
Seawater-archive comparison
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| Resumo: |
Neodymium isotopic compositions (143Nd/144Nd or εNd) have been used as a tracer of water masses and lithogenic inputs to the ocean. To further evaluate the faithfulness of this tracer, we have updated a global seawater εNd database and combined it with hydrography parameters (temperature, salinity, nutrients and oxygen concentrations), carbon isotopic ratio and radiocarbon of dissolved inorganic carbon. Archive εNd data are also compiled for leachates, foraminiferal tests, deep-sea corals and fish teeth/debris from the Holocene period (< 10,000 years). At water depths ≥ 1500 m, property-property plots show clear correlations between seawater εNd and the other variables, suggesting that large-scale water mass mixing is a primary control of deepwater εNd distribution. At ≥ 200 m, basin-scale seawater T-S-εNd diagrams demonstrate the isotopic evolution of different water masses. Seawater and archive εNd values are compared using property-property plots and T-S-εNd diagrams. Archive values generally agree with corresponding seawater values although they tend to be at the upper limit in the Pacific. Both positive and negative offsets exist in the northern North Atlantic. Applying multiple regression analysis to deep (≥ 1500 m) seawater data, we established empirical equations that predict the main, large-scale, deepwater εNd trends from hydrography parameters. Large offsets from the predicted values are interpreted as a sign of significant local/regional influence. Dominant continental influence on seawater and archive εNd is observed mainly within 1000 km from the continents. Generally, seawater and archive εNd values form gradual latitudinal trend in the Atlantic and Pacific at depths ≥ 600 m, consistent with the idea that Nd isotopes help distinguish between northern/southern sourced water contributions at intermediate and deep water depths.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00376/48768/49165.pdf
DOI:10.1016/j.chemgeo.2017.03.018
http://archimer.ifremer.fr/doc/00376/48768/
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| Editor: |
Elsevier Science Bv
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| Formato: |
application/pdf
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| Fonte: |
Chemical Geology (0009-2541) (Elsevier Science Bv), 2017-05 , Vol. 457 , P. 131-148
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| Direitos: |
2017 Elsevier B.V. All rights reserved.
info:eu-repo/semantics/openAccess
restricted use
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