Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison
At the junction of greenhouse and icehouse climate states, the Eocene–Oligocene Transition (EOT) is a key moment in Cenozoic climate history. While it is associated with severe extinctions and biodiversity turnovers on land, the role of terrestrial climate evolution remains poorly resolved, especial...
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Copernicus Publications
2022
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fttriple:oai:gotriple.eu:oai:doaj.org/article:23e6bde1acf94adaaf28374305034129 2023-05-15T13:32:55+02:00 Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison A. Toumoulin D. Tardif Y. Donnadieu A. Licht J.-B. Ladant L. Kunzmann G. Dupont-Nivet 2022-02-01 https://doi.org/10.5194/cp-18-341-2022 https://cp.copernicus.org/articles/18/341/2022/cp-18-341-2022.pdf https://doaj.org/article/23e6bde1acf94adaaf28374305034129 en eng Copernicus Publications doi:10.5194/cp-18-341-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/341/2022/cp-18-341-2022.pdf https://doaj.org/article/23e6bde1acf94adaaf28374305034129 undefined Climate of the Past, Vol 18, Pp 341-362 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/cp-18-341-2022 2023-01-22T19:30:42Z At the junction of greenhouse and icehouse climate states, the Eocene–Oligocene Transition (EOT) is a key moment in Cenozoic climate history. While it is associated with severe extinctions and biodiversity turnovers on land, the role of terrestrial climate evolution remains poorly resolved, especially the associated changes in seasonality. Some paleobotanical and geochemical continental records in parts of the Northern Hemisphere suggest the EOT is associated with a marked cooling in winter, leading to the development of more pronounced seasons (i.e., an increase in the mean annual range of temperature, MATR). However, the MATR increase has been barely studied by climate models and large uncertainties remain on its origin, geographical extent and impact. In order to better understand and describe temperature seasonality changes between the middle Eocene and the early Oligocene, we use the Earth system model IPSL-CM5A2 and a set of simulations reconstructing the EOT through three major climate forcings: pCO2 decrease (1120, 840 and 560 ppm), the Antarctic ice-sheet (AIS) formation and the associated sea-level decrease. Our simulations suggest that pCO2 lowering alone is not sufficient to explain the seasonality evolution described by the data through the EOT but rather that the combined effects of pCO2, AIS formation and increased continentality provide the best data–model agreement. pCO2 decrease induces a zonal pattern with alternating increasing and decreasing seasonality bands particularly strong in the northern high latitudes (up to 8 ∘C MATR increase) due to sea-ice and surface albedo feedback. Conversely, the onset of the AIS is responsible for a more constant surface albedo yearly, which leads to a strong decrease in seasonality in the southern midlatitudes to high latitudes (>40∘ S). Finally, continental areas that emerged due to the sea-level lowering cause the largest increase in seasonality and explain most of the global heterogeneity in MATR changes (ΔMATR) patterns. The ΔMATR patterns we ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Unknown Antarctic The Antarctic Climate of the Past 18 2 341 362 |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir A. Toumoulin D. Tardif Y. Donnadieu A. Licht J.-B. Ladant L. Kunzmann G. Dupont-Nivet Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
topic_facet |
geo envir |
description |
At the junction of greenhouse and icehouse climate states, the Eocene–Oligocene Transition (EOT) is a key moment in Cenozoic climate history. While it is associated with severe extinctions and biodiversity turnovers on land, the role of terrestrial climate evolution remains poorly resolved, especially the associated changes in seasonality. Some paleobotanical and geochemical continental records in parts of the Northern Hemisphere suggest the EOT is associated with a marked cooling in winter, leading to the development of more pronounced seasons (i.e., an increase in the mean annual range of temperature, MATR). However, the MATR increase has been barely studied by climate models and large uncertainties remain on its origin, geographical extent and impact. In order to better understand and describe temperature seasonality changes between the middle Eocene and the early Oligocene, we use the Earth system model IPSL-CM5A2 and a set of simulations reconstructing the EOT through three major climate forcings: pCO2 decrease (1120, 840 and 560 ppm), the Antarctic ice-sheet (AIS) formation and the associated sea-level decrease. Our simulations suggest that pCO2 lowering alone is not sufficient to explain the seasonality evolution described by the data through the EOT but rather that the combined effects of pCO2, AIS formation and increased continentality provide the best data–model agreement. pCO2 decrease induces a zonal pattern with alternating increasing and decreasing seasonality bands particularly strong in the northern high latitudes (up to 8 ∘C MATR increase) due to sea-ice and surface albedo feedback. Conversely, the onset of the AIS is responsible for a more constant surface albedo yearly, which leads to a strong decrease in seasonality in the southern midlatitudes to high latitudes (>40∘ S). Finally, continental areas that emerged due to the sea-level lowering cause the largest increase in seasonality and explain most of the global heterogeneity in MATR changes (ΔMATR) patterns. The ΔMATR patterns we ... |
format |
Article in Journal/Newspaper |
author |
A. Toumoulin D. Tardif Y. Donnadieu A. Licht J.-B. Ladant L. Kunzmann G. Dupont-Nivet |
author_facet |
A. Toumoulin D. Tardif Y. Donnadieu A. Licht J.-B. Ladant L. Kunzmann G. Dupont-Nivet |
author_sort |
A. Toumoulin |
title |
Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
title_short |
Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
title_full |
Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
title_fullStr |
Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
title_full_unstemmed |
Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison |
title_sort |
evolution of continental temperature seasonality from the eocene greenhouse to the oligocene icehouse –a model–data comparison |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-341-2022 https://cp.copernicus.org/articles/18/341/2022/cp-18-341-2022.pdf https://doaj.org/article/23e6bde1acf94adaaf28374305034129 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice |
op_source |
Climate of the Past, Vol 18, Pp 341-362 (2022) |
op_relation |
doi:10.5194/cp-18-341-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/341/2022/cp-18-341-2022.pdf https://doaj.org/article/23e6bde1acf94adaaf28374305034129 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-18-341-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
2 |
container_start_page |
341 |
op_container_end_page |
362 |
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