The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons
The Eocene-Oligocene transition (EOT) from a largely ice-free greenhouse world to an icehouse climate with the first major glaciation of Antarctica was a phase of major climate and environmental change occurring ~34 million years ago (Ma) and lasting ~500 kyr. The change is marked by a global shift...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/431732 2023-10-25T01:30:06+02:00 The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons Hutchinson, David Coxall, Helen Lunt, Daniel Steinthorsdottir, Margret de Boer, Agatha Baatsen, Michiel von der Heydt, Anna Huber, Matthew Kennedy-Asser, Alan Kunzmann, Lutz Ladant, Jean-Baptiste Lear, Caroline Moraweck, Karolin Pearson, Paul Piga, Emanuela Pound, Matthew Salzmann, Ulrich Scher, Howie Sijp, Willem Śliwińska, Kasia Wilson, Paul A Zhang, Zhongshi Sub Dynamics Meteorology Sub Physical Oceanography Marine and Atmospheric Research 2020 application/pdf https://dspace.library.uu.nl/handle/1874/431732 en eng 1814-9324 https://dspace.library.uu.nl/handle/1874/431732 info:eu-repo/semantics/OpenAccess /dk/atira/pure/researchoutput/researchoutputtypes/workingpaper/preprint 2020 ftunivutrecht 2023-09-27T22:12:06Z The Eocene-Oligocene transition (EOT) from a largely ice-free greenhouse world to an icehouse climate with the first major glaciation of Antarctica was a phase of major climate and environmental change occurring ~34 million years ago (Ma) and lasting ~500 kyr. The change is marked by a global shift in deep sea d 18 O representing a combination of deep-ocean 30 cooling and global ice sheet growth. At the same time, multiple independent proxies for sea surface temperature indicate a surface ocean cooling, and major changes in global fauna and flora record a shift toward more cold-climate adapted species. The major explanations of this transition that have been suggested are a decline in atmospheric CO2, and changes to ocean gateways, while orbital forcing likely influenced the precise timing of the glaciation. This work reviews and synthesises proxy evidence of paleogeography, temperature, ice sheets, ocean circulation, and CO2 change from the marine and terrestrial realms. 35 Furthermore, we quantitatively compare proxy records of change to an ensemble of model simulations of temperature change across the EOT. The model simulations compare three forcing mechanisms across the EOT: CO2 decrease, paleogeographic https://doi.org/10.5194/cp-2020-68 Preprint. Discussion started: 18 May 2020 c Author(s) 2020. CC BY 4.0 License. 2 changes, and ice sheet growth. We find that CO2 forcing provides by far the best explanation of the combined proxy evidence, and based on our model ensemble, we estimate that a CO2 decrease of about 1.6x across the EOT (e.g. from 910 to 560 ppmv) achieves the best fit to the temperature change recorded in the proxies. This model-derived CO2 decrease is consistent with 40 proxy estimates of CO2 decline at the EOT. Other/Unknown Material Antarc* Antarctica Ice Sheet Utrecht University Repository |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
The Eocene-Oligocene transition (EOT) from a largely ice-free greenhouse world to an icehouse climate with the first major glaciation of Antarctica was a phase of major climate and environmental change occurring ~34 million years ago (Ma) and lasting ~500 kyr. The change is marked by a global shift in deep sea d 18 O representing a combination of deep-ocean 30 cooling and global ice sheet growth. At the same time, multiple independent proxies for sea surface temperature indicate a surface ocean cooling, and major changes in global fauna and flora record a shift toward more cold-climate adapted species. The major explanations of this transition that have been suggested are a decline in atmospheric CO2, and changes to ocean gateways, while orbital forcing likely influenced the precise timing of the glaciation. This work reviews and synthesises proxy evidence of paleogeography, temperature, ice sheets, ocean circulation, and CO2 change from the marine and terrestrial realms. 35 Furthermore, we quantitatively compare proxy records of change to an ensemble of model simulations of temperature change across the EOT. The model simulations compare three forcing mechanisms across the EOT: CO2 decrease, paleogeographic https://doi.org/10.5194/cp-2020-68 Preprint. Discussion started: 18 May 2020 c Author(s) 2020. CC BY 4.0 License. 2 changes, and ice sheet growth. We find that CO2 forcing provides by far the best explanation of the combined proxy evidence, and based on our model ensemble, we estimate that a CO2 decrease of about 1.6x across the EOT (e.g. from 910 to 560 ppmv) achieves the best fit to the temperature change recorded in the proxies. This model-derived CO2 decrease is consistent with 40 proxy estimates of CO2 decline at the EOT. |
author2 |
Sub Dynamics Meteorology Sub Physical Oceanography Marine and Atmospheric Research |
format |
Other/Unknown Material |
author |
Hutchinson, David Coxall, Helen Lunt, Daniel Steinthorsdottir, Margret de Boer, Agatha Baatsen, Michiel von der Heydt, Anna Huber, Matthew Kennedy-Asser, Alan Kunzmann, Lutz Ladant, Jean-Baptiste Lear, Caroline Moraweck, Karolin Pearson, Paul Piga, Emanuela Pound, Matthew Salzmann, Ulrich Scher, Howie Sijp, Willem Śliwińska, Kasia Wilson, Paul A Zhang, Zhongshi |
spellingShingle |
Hutchinson, David Coxall, Helen Lunt, Daniel Steinthorsdottir, Margret de Boer, Agatha Baatsen, Michiel von der Heydt, Anna Huber, Matthew Kennedy-Asser, Alan Kunzmann, Lutz Ladant, Jean-Baptiste Lear, Caroline Moraweck, Karolin Pearson, Paul Piga, Emanuela Pound, Matthew Salzmann, Ulrich Scher, Howie Sijp, Willem Śliwińska, Kasia Wilson, Paul A Zhang, Zhongshi The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
author_facet |
Hutchinson, David Coxall, Helen Lunt, Daniel Steinthorsdottir, Margret de Boer, Agatha Baatsen, Michiel von der Heydt, Anna Huber, Matthew Kennedy-Asser, Alan Kunzmann, Lutz Ladant, Jean-Baptiste Lear, Caroline Moraweck, Karolin Pearson, Paul Piga, Emanuela Pound, Matthew Salzmann, Ulrich Scher, Howie Sijp, Willem Śliwińska, Kasia Wilson, Paul A Zhang, Zhongshi |
author_sort |
Hutchinson, David |
title |
The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
title_short |
The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
title_full |
The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
title_fullStr |
The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
title_full_unstemmed |
The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
title_sort |
eocene-oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons |
publishDate |
2020 |
url |
https://dspace.library.uu.nl/handle/1874/431732 |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_relation |
1814-9324 https://dspace.library.uu.nl/handle/1874/431732 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1780736742786072576 |