Articles | Volume 20, issue 6
https://doi.org/10.5194/cp-20-1303-2024
© Author(s) 2024. 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-20-1303-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jun 2024
Research article |
| 12 Jun 2024
| 12 Jun 2024
Polar amplification of orbital-scale climate variability in the early Eocene greenhouse world
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Tobias Agterhuis
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
now at: School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom
Danielle Gerritsma
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Myrthe de Goeij
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Xiaoqing Liu
Earth, Atmospheric, and Planetary Sciences Department, Purdue University, West Lafayette, IN 47907-2051, USA
Pauline de Regt
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Addison Rice
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Laurens Vennema
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Claudia Agnini
Dipartimento di Geoscienze, Universita degli Studi di Padua, 35131 Padua, Italy
Peter K. Bijl
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Joost Frieling
Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom
Matthew Huber
Earth, Atmospheric, and Planetary Sciences Department, Purdue University, West Lafayette, IN 47907-2051, USA
Francien Peterse
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Appy Sluijs
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, 3584CB Utrecht, the Netherlands
Data sets
Ocean Drilling Program Site 959 Datasets (1.0.0) Appy Sluijs et al. https://doi.org/10.5281/zenodo.8309643
Short summary
Polar amplification (PA) is a key uncertainty in climate projections. The factors that dominantly control PA are difficult to separate. Here we provide an estimate for the non-ice-related PA by reconstructing tropical ocean temperature variability from the ice-free early Eocene, which we compare to deep-ocean-derived high-latitude temperature variability across short-lived warming periods. We find a PA factor of 1.7–2.3 on 20 kyr timescales, which is somewhat larger than model estimates.
Polar amplification (PA) is a key uncertainty in climate projections. The factors that...
