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

Nature Communications
Yannick DonnadieuJean-François Deconinck

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 (ɛNd). 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 ɛNd values recorded in the Atlantic and Indian deep waters during the Late Cretaceous.

References

Jul 18, 2008·Nature·Steven C Turgeon, Robert A Creaser
Dec 15, 2010·Annual Review of Marine Science·Ralph E KeelingNicolas Gruber

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Citations

Sep 22, 2016·Nature Communications·Jean-Baptiste Ladant, Yannick Donnadieu
Mar 2, 2019·Science·Svetlana BotsyunJeremy K Caves Rugenstein
Sep 20, 2017·Scientific Reports·Lucía Pérez-Díaz, Graeme Eagles
Dec 16, 2020·Proceedings of the National Academy of Sciences of the United States of America·Sebastiaan J van de VeldeFilip J R Meysman
Nov 2, 2019·Molecular Phylogenetics and Evolution·Denis Copilaş-CiocianuCene Fišer

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Software Mentioned

CAS
SEWALL
Islands
CTRL94Ma
FOAM

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