Data/hora: 09/06/2024 09:10:02

Provedor de dados: | 5
País: | France
Título: | Radiocarbon evidence for alternating northern and southern sources of ventilation of the deep Atlantic carbon pool during the last deglaciation
Autores: | Skinner, Luke C.; Waelbroeck, Claire; Scrivner, Adam E.; Fallon, Stewart J.
Data: | 2014-04-15
Ano: | 2014
Palavras-chave: | Ocean circulation; Carbon cycle; Abrupt change.
Resumo: | Recent theories for glacial-interglacial climate transitions call on millennial climate perturbations that purged the deep sea of sequestered carbon dioxide via a "bipolar ventilation seesaw." However, the viability of this hypothesis has been contested, and robust evidence in its support is lacking. Here we present a record of North Atlantic deep-water radiocarbon ventilation, which we compare with similar data from the Southern Ocean. A striking coherence in ventilation changes is found, with extremely high ventilation ages prevailing across the deep Atlantic during the last glacial period. The data also reveal two reversals in the ventilation gradient between the deep North Atlantic and Southern Ocean during Heinrich Stadial 1 and the Younger Dryas. These coincided with periods of sustained atmospheric CO2 rise and appear to have been driven by enhanced ocean-atmosphere exchange, primarily in the Southern Ocean. These results confirm the operation of a bipolar ventilation seesaw during deglaciation and underline the contribution of abrupt regional climate anomalies to longer-term global climate transitions.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00290/40153/39327.pdf

https://archimer.ifremer.fr/doc/00290/40153/39641.pdf

https://archimer.ifremer.fr/doc/00290/40153/39642.txt

https://archimer.ifremer.fr/doc/00290/40153/39643.txt

DOI:10.1073/pnas.1400668111

https://archimer.ifremer.fr/doc/00290/40153/

Editor: | Natl Acad Sciences
Formato: | application/pdf
Fonte: | Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Natl Acad Sciences), 2014-04-15 , Vol. 111 , N. 15 , P. 5480-5484

Fonte:

2014 National Academy of Sciences

info:eu-repo/semantics/openAccess

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