Articles | Volume 17, issue 5
https://doi.org/10.5194/cp-17-2255-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-2255-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Oct 2021
Research article |
| 26 Oct 2021
| 26 Oct 2021
Southern Ocean bottom-water cooling and ice sheet expansion during the middle Miocene climate transition
Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Department of Earth Science, University of Bergen, Bergen, 5007, Norway
present address: Max Planck Institute for Chemistry, Mainz, 55128, Germany
Sevasti Modestou
Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Department of Earth Science, University of Bergen, Bergen, 5007, Norway
Stefano M. Bernasconi
Geological Institute, ETH Zurich, Zurich, 8092, Switzerland
A. Nele Meckler
Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Department of Earth Science, University of Bergen, Bergen, 5007, Norway
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Short summary
The Miocene climatic optimum associated with high atmospheric CO2 levels (~17–14 Ma) was followed by a period of dramatic climate change. We present a clumped isotope-based bottom-water temperature record from the Southern Ocean covering this key climate transition. Our record reveals warm conditions and a substantial cooling preceding the main ice volume increase, possibly caused by thresholds involved in ice growth and/or regional effects at our study site.
The Miocene climatic optimum associated with high atmospheric CO2 levels (~17–14 Ma) was...
