A better-ventilated ocean triggered by Late Cretaceous changes in continental configuration

Abstract : Oceanic anoxic events (OAEs) are large-scale events of oxygen depletion in the deep ocean that happened during pre-Cenozoic periods of extreme warmth. Here, to assess the role of major continental configuration changes occurring during the Late Cretaceous on oceanic circulation modes, which in turn influence the oxygenation level of the deep ocean, we use a coupled ocean atmosphere climate model. We simulate ocean dynamics during two different time slices and compare these with existing neodymium isotope data (εNd). Although deep-water production in the North Pacific is continuous, the simulations at 94 and 71 Ma show a shift in southern deep-water production sites from South Pacific to South Atlantic and Indian Ocean locations. Our modelling results support the hypothesis that an intensification of southern Atlantic deep-water production and a reversal of deep-water fluxes through the Caribbean Seaway were the main causes of the decrease in εNd values recorded in the Atlantic and Indian deep waters during the Late Cretaceous.
Document type :
Journal articles
Complete list of metadatas

Cited literature [66 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01259857
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, January 21, 2016 - 10:49:57 AM
Last modification on : Friday, April 5, 2019 - 8:17:44 PM
Long-term archiving on : Friday, April 22, 2016 - 10:22:16 AM

File

ncomms10316.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Yannick Donnadieu, Emmanuelle Pucéat, Mathieu Moiroud, François Guillocheau, Jean-François Deconinck. A better-ventilated ocean triggered by Late Cretaceous changes in continental configuration. Nature Communications, Nature Publishing Group, 2016, 7, pp.Art. n°10316. ⟨10.1038/ncomms10316⟩. ⟨insu-01259857⟩

Share

Metrics

Record views

377

Files downloads

193