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      The onset of modern-like Atlantic meridional overturning circulation at the Eocene-Oligocene transition: Evidence, causes, and possible implications for global cooling : EOT ONSET OF MODERN-LIKE AMOC

      1 , 2
      Geochemistry, Geophysics, Geosystems
      Wiley

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          Abyssal recipes II: energetics of tidal and wind mixing

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            Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2.

            The sudden, widespread glaciation of Antarctica and the associated shift towards colder temperatures at the Eocene/Oligocene boundary (approximately 34 million years ago) (refs 1-4) is one of the most fundamental reorganizations of global climate known in the geologic record. The glaciation of Antarctica has hitherto been thought to result from the tectonic opening of Southern Ocean gateways, which enabled the formation of the Antarctic Circumpolar Current and the subsequent thermal isolation of the Antarctic continent. Here we simulate the glacial inception and early growth of the East Antarctic Ice Sheet using a general circulation model with coupled components for atmosphere, ocean, ice sheet and sediment, and which incorporates palaeogeography, greenhouse gas, changing orbital parameters, and varying ocean heat transport. In our model, declining Cenozoic CO2 first leads to the formation of small, highly dynamic ice caps on high Antarctic plateaux. At a later time, a CO2 threshold is crossed, initiating ice-sheet height/mass-balance feedbacks that cause the ice caps to expand rapidly with large orbital variations, eventually coalescing into a continental-scale East Antarctic Ice Sheet. According to our simulation the opening of Southern Ocean gateways plays a secondary role in this transition, relative to CO2 concentration.
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              Cenozoic evolution of Antarctic glaciation, the circum-Antarctic Ocean, and their impact on global paleoceanography

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                Author and article information

                Journal
                Geochemistry, Geophysics, Geosystems
                Geochem. Geophys. Geosyst.
                Wiley
                15252027
                June 2017
                June 2017
                June 17 2017
                : 18
                : 6
                : 2177-2199
                Affiliations
                [1 ]Geological Survey of Israel; Jerusalem Israel
                [2 ]Institute of Earth Sciences, Givat Ram Campus, Hebrew University; Jerusalem Israel
                Article
                10.1002/2017GC006826
                bd22e1e0-fa5f-4c14-8655-566aae713d6c
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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