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Mediterranean isolation preconditioning the Earth System for late Miocene climate cooling

Capella, Walter; Flecker, Rachel; Hernández-Molina, F Javier; Simon, Dirk; Meijer, Paul Thomas; Rogerson, Mike; Sierro, Francisco J; Krijgsman, Wout

Authors

Walter Capella

Rachel Flecker

F Javier Hernández-Molina

Dirk Simon

Paul Thomas Meijer

Francisco J Sierro

Wout Krijgsman

Abstract

A global Neogene cooling trend culminated ~7 million years ago with the onset of 10 Greenland glaciation. Increased ocean-atmosphere interaction and low-to high-latitude 11 circulation are thought to be key factors in reorganizing late Miocene global 12 temperature and precipitation patterns, but the drivers of this reorganization have yet 13 to be identified. Here, we present new information about the evolution of the Atlantic-14 Mediterranean gateway that generated Mediterranean overflow. We use sedimentary 15 and palaeogeographic evidence to constrain the timing and dimensions of this gateway 16 and document the initiation of a saline plume of water within the North Atlantic. Today, 17 this saline jet entrains and transports Eastern North Atlantic water and its dissolved 18 inorganic carbon into the interior of the ocean, contributing to the drawdown of CO 2 19 and the sensitivity of the ocean to atmospheric changes. We show that during the 20 Miocene this transport emerged simultaneously with gateway restriction and propose 21 that the resulting interaction of ocean-surface and ocean-interior carbon inventories 22 would have greatly enhanced ocean-atmosphere exchange, preconditioning the Earth 23 System for late Miocene cooling. 24

Journal Article Type Article
Print ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 9
Article Number 3795
Institution Citation Capella, W., Flecker, R., Hernández-Molina, F. J., Simon, D., Meijer, P. T., Rogerson, M., …Krijgsman, W. (in press). Mediterranean isolation preconditioning the Earth System for late Miocene climate cooling. Scientific reports, 9, https://doi.org/10.1038/s41598-019-40208-2
DOI https://doi.org/10.1038/s41598-019-40208-2
Publisher URL https://www.nature.com/articles/s41598-019-40208-2

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