Cenozoic evolution of deep ocean temperature from clumped isotope thermometry

Funding: This work was supported by the Swiss National Science Foundation (MHV fellowship to A.N.M.); the European Research Council (starting grant 638467 to A.N.M. and starting grant 805246 to J.W.B.R.); the Trond Mohn Foundation (starting grant BFS2015REK01 to A.N.M.); the Norwegian Research Counc...

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Bibliographic Details
Published in:Science
Main Authors: Meckler, A N, Sexton, P F, Piasecki, A M, Leutert, T J, Marquardt, J, Ziegler, M, Agterhuis, T, Lourens, L J, Rae, J W B, Barnet, J, Tripati, A, Bernasconi, S M
Other Authors: European Research Council, University of St Andrews. School of Earth & Environmental Sciences, University of St Andrews. Centre for Energy Ethics, University of St Andrews. St Andrews Isotope Geochemistry
Format: Article in Journal/Newspaper
Language:English
Published: 2022
Subjects:
Climactic Optimum (EECO)
Southern-ocean
Sea-level
Circulation changes
Eocene
Paleocene
Seawater
Oxygen
Carbon
Foraminifera
GC Oceanography
QD Chemistry
DAS
SDG 13 - Climate Action
AC
GC
QD
Southern Ocean
Online Access:http://hdl.handle.net/10023/26555
https://doi.org/10.1126/science.abk0604
https://oro.open.ac.uk/84039/
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Summary:Funding: This work was supported by the Swiss National Science Foundation (MHV fellowship to A.N.M.); the European Research Council (starting grant 638467 to A.N.M. and starting grant 805246 to J.W.B.R.); the Trond Mohn Foundation (starting grant BFS2015REK01 to A.N.M.); the Norwegian Research Council (infrastructure grant 245907 to A.N.M.); the Natural Environment Research Council (NERC grant NE/P019331/1 to P.F.S.); the Dutch Research Council (NWO VIDI project 016.161.365 to M.Z.); the Heising Simons Foundation (grant 2022-3314 to A.T.); and the Netherlands Earth System Science Centre (NESSC) (L.J.L.). Characterizing past climate states is crucial for understanding the future consequences of ongoing greenhouse gas emissions. Here, we revisit the benchmark time series for deep ocean temperature across the past 65 million years using clumped isotope thermometry. Our temperature estimates from the deep Atlantic Ocean are overall much warmer compared with oxygen isotope-based reconstructions, highlighting the likely influence of changes in deep ocean pH and/or seawater oxygen isotope composition on classical oxygen isotope records of the Cenozoic. In addition, our data reveal previously unrecognized large swings in deep ocean temperature during early Eocene acute greenhouse warmth. Our results call for a reassessment of the Cenozoic history of ocean temperatures to achieve a more accurate understanding of the nature of climatic responses to tectonic events and variable greenhouse forcing. Postprint Peer reviewed

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