Erin L. McClymont
Lessons from a high-CO2 world: an ocean view from ∼ 3 million years ago
McClymont, Erin L.; Ford, Heather L.; Ho, Sze Ling; Tindall, Julia C.; Haywood, Alan M.; Alonso-Garcia, Montserrat; Bailey, Ian; Berke, Melissa A.; Littler, Kate; Patterson, Molly O.; Petrick, Benjamin; Peterse, Francien; Ravelo, A. Christina; Risebrobakken, Bj�rg; De Schepper, Stijn; Swann, George E. A.; Thirumalai, Kaustubh; Tierney, Jessica E.; van der Weijst, Carolien; White, Sarah; Abe-Ouchi, Ayako; Baatsen, Michiel L. J.; Brady, Esther C.; Chan, Wing-Le; Chandan, Deepak; Feng, Ran; Guo, Chuncheng; von der Heydt, Anna S.; Hunter, Stephen; Li, Xiangyi; Lohmann, Gerrit; Nisancioglu, Kerim H.; Otto-Bliesner, Bette L.; Peltier, W. Richard; Stepanek, Christian; Zhang, Zhongshi
Authors
Heather L. Ford
Sze Ling Ho
Julia C. Tindall
Alan M. Haywood
Montserrat Alonso-Garcia
Ian Bailey
Melissa A. Berke
Kate Littler
Molly O. Patterson
Benjamin Petrick
Francien Peterse
A. Christina Ravelo
Bj�rg Risebrobakken
Stijn De Schepper
Prof GEORGE SWANN GEORGE.SWANN@NOTTINGHAM.AC.UK
Professor of Palaeoclimatology
Kaustubh Thirumalai
Jessica E. Tierney
Carolien van der Weijst
Sarah White
Ayako Abe-Ouchi
Michiel L. J. Baatsen
Esther C. Brady
Wing-Le Chan
Deepak Chandan
Ran Feng
Chuncheng Guo
Anna S. von der Heydt
Stephen Hunter
Xiangyi Li
Gerrit Lohmann
Kerim H. Nisancioglu
Bette L. Otto-Bliesner
W. Richard Peltier
Christian Stepanek
Zhongshi Zhang
Abstract
A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3.205±0.01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by ∼2.3 ∘C for the combined proxy data (foraminifera Mg∕Ca and alkenones), or by ∼3.2–3.4 ∘C (alkenones only). Compared to the pre-industrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean sea-surface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes.
Citation
McClymont, E. L., Ford, H. L., Ho, S. L., Tindall, J. C., Haywood, A. M., Alonso-Garcia, M., …Zhang, Z. (2020). Lessons from a high-CO2 world: an ocean view from ∼ 3 million years ago. Climate of the Past, 16(4), 1599-1615. https://doi.org/10.5194/cp-16-1599-2020
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 2, 2020 |
Online Publication Date | Aug 27, 2020 |
Publication Date | Aug 27, 2020 |
Deposit Date | Aug 27, 2020 |
Publicly Available Date | Sep 7, 2020 |
Journal | Climate of the Past |
Print ISSN | 1814-9324 |
Publisher | European Geosciences Union |
Peer Reviewed | Peer Reviewed |
Volume | 16 |
Issue | 4 |
Pages | 1599-1615 |
DOI | https://doi.org/10.5194/cp-16-1599-2020 |
Keywords | Stratigraphy; Palaeontology; Global and Planetary Change |
Public URL | https://nottingham-repository.worktribe.com/output/4853756 |
Publisher URL | https://cp.copernicus.org/articles/16/1599/2020/ |
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Publisher Licence URL
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