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

被引：87

作者：

Donnadieu, Yannick ^{[1
]}

Puceat, Emmanuelle ^{[2
]}

Moiroud, Mathieu ^{[2
]}

Guillocheau, Francios ^{[3
]}

Deconinck, Jean-Francois ^{[2
]}

机构：

[1] Univ Paris Saclay, CEA CNRS UVSQ, LSCE IPSL, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France

[2] Univ Bourgogne Franche Comte, UMR CNRS 6282, Biogeosci Dijon, F-21000 Dijon, France

[3] Univ Rennes, UMR CNRS 6118, Geosci Rennes, F-35042 Rennes, France

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

NEODYMIUM ISOTOPIC COMPOSITION; DEEP-WATER; NORTH-ATLANTIC; CIRCULATION; CLIMATE; ND; CO2; EVOLUTION; MODEL; END;

D O I：

10.1038/ncomms10316

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 (epsilon(Nd)). Although deep-water production in the North Pacific is continuous, the simulations at 94 and 71Ma 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 eNd values recorded in the Atlantic and Indian deep waters during the Late Cretaceous.

引用

页数：12