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An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

An astronomically dated record of Earth’s climate and its predictability over the last 66 million years
An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

Much of our understanding of Earth's past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states-Hothouse, Warmhouse, Coolhouse, Icehouse-are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.

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Westerhold, Thomas
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Marwan, Norbert
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Drury, Anna Joy
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Liebrand, Diederik
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Agnini, Claudia
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Anagnostou, Eleni
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Barnet, James S. K.
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Bohaty, Steven M.
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De Vleeschouwer, David
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Florindo, Fabio
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Frederichs, Thomas
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Hodell, David A.
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Holbourn, Ann E.
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Kroon, Dick
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Lauretano, Vittoria
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Littler, Kate
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Lourens, Lucas J.
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Lyle, Mitchell
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Pälike, Heiko
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Röhl, Ursula
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Wilkens, Roy H.
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Wilson, Paul A.
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Zachos, James C.
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Westerhold, Thomas
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Marwan, Norbert
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Drury, Anna Joy
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Liebrand, Diederik
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Agnini, Claudia
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Anagnostou, Eleni
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Barnet, James S. K.
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Bohaty, Steven M.
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De Vleeschouwer, David
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Florindo, Fabio
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Frederichs, Thomas
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Hodell, David A.
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Holbourn, Ann E.
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Kroon, Dick
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Littler, Kate
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Lourens, Lucas J.
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Lyle, Mitchell
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Pälike, Heiko
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Röhl, Ursula
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Tian, Jun
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Wilkens, Roy H.
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Wilson, Paul A.
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Zachos, James C.
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Westerhold, Thomas, Marwan, Norbert, Drury, Anna Joy, Liebrand, Diederik, Agnini, Claudia, Anagnostou, Eleni, Barnet, James S. K., Bohaty, Steven M., De Vleeschouwer, David, Florindo, Fabio, Frederichs, Thomas, Hodell, David A., Holbourn, Ann E., Kroon, Dick, Lauretano, Vittoria, Littler, Kate, Lourens, Lucas J., Lyle, Mitchell, Pälike, Heiko, Röhl, Ursula, Tian, Jun, Wilkens, Roy H., Wilson, Paul A. and Zachos, James C. (2020) An astronomically dated record of Earth’s climate and its predictability over the last 66 million years. Science, 369 (6509), 1383-1388. (doi:10.1126/science.aba6853).

Record type: Article

Abstract

Much of our understanding of Earth's past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states-Hothouse, Warmhouse, Coolhouse, Icehouse-are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.

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aba6853_v2Acc - Accepted Manuscript
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Accepted/In Press date: 28 July 2020
Published date: 11 September 2020

Identifiers

Local EPrints ID: 444010
URI: http://eprints.soton.ac.uk/id/eprint/444010
ISSN: 0036-8075
PURE UUID: 7b9a0a27-9643-4a75-b4c9-d563dac880a6
ORCID for Steven M. Bohaty: ORCID iD orcid.org/0000-0002-1193-7398

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Date deposited: 21 Sep 2020 17:09
Last modified: 26 Nov 2021 06:58

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Contributors

Author: Thomas Westerhold
Author: Norbert Marwan
Author: Anna Joy Drury
Author: Diederik Liebrand
Author: Claudia Agnini
Author: Eleni Anagnostou
Author: James S. K. Barnet
Author: David De Vleeschouwer
Author: Fabio Florindo
Author: Thomas Frederichs
Author: David A. Hodell
Author: Ann E. Holbourn
Author: Dick Kroon
Author: Vittoria Lauretano
Author: Kate Littler
Author: Lucas J. Lourens
Author: Mitchell Lyle
Author: Heiko Pälike
Author: Ursula Röhl
Author: Jun Tian
Author: Roy H. Wilkens
Author: Paul A. Wilson
Author: James C. Zachos

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