| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
The timing of deglacial circulation changes in the Atlantic
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| Autores: |
Waelbroeck, C.
Skinner, L. C.
Labeyrie, L.
Duplessy, J. -c.
Michel, E.
Vazquez Riveiros, Natalia
Gherardi, J. M.
Dewilde, F.
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| Data: |
2011-08
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| Ano: |
2011
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| Palavras-chave: |
Atlantic Ocean
Benthic oxygen isotope
Last deglaciation
Ocean circulation
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| Resumo: |
Well-dated benthic foraminifer oxygen isotopic records (delta O-18) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic delta O-18 cannot be used as a global correlation tool with millennial-scale precision, but on the other hand, the combination of benthic isotopic records with independent dating provides a wealth of information on past circulation changes. Comparing new South Atlantic benthic isotopic data with published benthic isotopic records, we show that (1) circulation changes first affected benthic delta O-18 in the 1000-2200 m range, with marked decreases in benthic delta O-18 taking place at similar to 17.5 cal. kyr B.P. (ka) due to the southward propagation of brine waters generated in the Nordic Seas during Heinrich Stadial 1 (HS1) cold period; (2) the arrival of delta O-18-depleted deglacial meltwater took place later at deeper North Atlantic sites; (3) hydrographic changes recorded in North Atlantic cores below 3000 m during HS1 do not correspond to simple alternations between northern-and southern-sourced water but likely reflect instead the incursion of brine-generated deep water of northern as well as southern origin; and (4) South Atlantic waters at similar to 44 degrees S and similar to 3800 m depth remained isolated from better-ventilated northern-sourced water masses until after the resumption of North Atlantic Deep Water (NADW) formation at the onset of the Bolling-Allerod, which led to the propagation of NADW into the South Atlantic.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00214/32517/31003.pdf
DOI:10.1029/2010PA002007
https://archimer.ifremer.fr/doc/00214/32517/
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| Editor: |
Amer Geophysical Union
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| Formato: |
application/pdf
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| Fonte: |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-08 , Vol. 26 , N. PA3213 , P. 1-10
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| Direitos: |
Copyright 2011 by the American Geophysical Union.
info:eu-repo/semantics/openAccess
restricted use
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