Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison
Global and regional climate changed dramatically with the expansion of the Antarctic Ice sheet at the Eocene-Oligocene Transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this...
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Online Access: | https://hdl.handle.net/1983/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://research-information.bris.ac.uk/en/publications/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://doi.org/10.5194/cp-2019-112 https://research-information.bris.ac.uk/ws/files/232644315/cp_16_555_2020.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/8fed5af3-d710-4d74-9a9b-9033f5bbc20a 2024-02-04T09:53:52+01:00 Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison Kennedy-Asser, Alan T Lunt, Daniel J Valdes, Paul J Ladant, Jean-Baptiste Frieling, Joost Lauretano, Vittoria 2020-03-19 application/pdf https://hdl.handle.net/1983/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://research-information.bris.ac.uk/en/publications/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://doi.org/10.5194/cp-2019-112 https://research-information.bris.ac.uk/ws/files/232644315/cp_16_555_2020.pdf eng eng info:eu-repo/semantics/openAccess Kennedy-Asser , A T , Lunt , D J , Valdes , P J , Ladant , J-B , Frieling , J & Lauretano , V 2020 , ' Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition : a model-data comparison ' , Climate of the Past , vol. 16 , pp. 555-573 . https://doi.org/10.5194/cp-2019-112 article 2020 ftubristolcris https://doi.org/10.5194/cp-2019-112 2024-01-11T23:43:58Z Global and regional climate changed dramatically with the expansion of the Antarctic Ice sheet at the Eocene-Oligocene Transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this time. To better understand the Southern Hemisphere regional climatic changes and the impact of glaciation on the Earth’s oceans and atmosphere at the EOT, we compiled a database of 10 ocean- and 4 land- surface temperature reconstructions from a range of proxy records and compared this with a series of fully-coupled, low resolution climate model simulations from two models (HadCM3BL and FOAM). Regional patterns in the proxy records of temperature show that cooling across the EOT was less at high latitudes and greater at mid-latitudes. While certain climate model simulations show moderate-good performance at recreating the temperature patterns shown in the data before and after the EOT, in general the model simulations do not capture the absolute latitudinal temperature gradient shown by the data, being too cold particularly at high latitudes. When taking into account the absolute temperature before and after the EOT, as well as the change in temperature across it, simulations with a closed Drake Passage before and after the EOT or with an opening of the Drake Passage across the EOT perform poorly, whereas simulations with a drop in atmospheric pCO2 in combination with ice growth generally perform better. This provides further support to previous research that changes in atmospheric pCO2 are more likely to have been the driver of the EOT climatic changes, as opposed to opening of the Drake Passage. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Ice Sheet Southern Ocean University of Bristol: Bristol Research Antarctic Drake Passage Southern Ocean The Antarctic |
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Open Polar |
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University of Bristol: Bristol Research |
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ftubristolcris |
language |
English |
description |
Global and regional climate changed dramatically with the expansion of the Antarctic Ice sheet at the Eocene-Oligocene Transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this time. To better understand the Southern Hemisphere regional climatic changes and the impact of glaciation on the Earth’s oceans and atmosphere at the EOT, we compiled a database of 10 ocean- and 4 land- surface temperature reconstructions from a range of proxy records and compared this with a series of fully-coupled, low resolution climate model simulations from two models (HadCM3BL and FOAM). Regional patterns in the proxy records of temperature show that cooling across the EOT was less at high latitudes and greater at mid-latitudes. While certain climate model simulations show moderate-good performance at recreating the temperature patterns shown in the data before and after the EOT, in general the model simulations do not capture the absolute latitudinal temperature gradient shown by the data, being too cold particularly at high latitudes. When taking into account the absolute temperature before and after the EOT, as well as the change in temperature across it, simulations with a closed Drake Passage before and after the EOT or with an opening of the Drake Passage across the EOT perform poorly, whereas simulations with a drop in atmospheric pCO2 in combination with ice growth generally perform better. This provides further support to previous research that changes in atmospheric pCO2 are more likely to have been the driver of the EOT climatic changes, as opposed to opening of the Drake Passage. |
format |
Article in Journal/Newspaper |
author |
Kennedy-Asser, Alan T Lunt, Daniel J Valdes, Paul J Ladant, Jean-Baptiste Frieling, Joost Lauretano, Vittoria |
spellingShingle |
Kennedy-Asser, Alan T Lunt, Daniel J Valdes, Paul J Ladant, Jean-Baptiste Frieling, Joost Lauretano, Vittoria Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
author_facet |
Kennedy-Asser, Alan T Lunt, Daniel J Valdes, Paul J Ladant, Jean-Baptiste Frieling, Joost Lauretano, Vittoria |
author_sort |
Kennedy-Asser, Alan T |
title |
Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
title_short |
Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
title_full |
Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
title_fullStr |
Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
title_full_unstemmed |
Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition:a model-data comparison |
title_sort |
changes in the high latitude southern hemisphere through the eocene-oligocene transition:a model-data comparison |
publishDate |
2020 |
url |
https://hdl.handle.net/1983/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://research-information.bris.ac.uk/en/publications/8fed5af3-d710-4d74-9a9b-9033f5bbc20a https://doi.org/10.5194/cp-2019-112 https://research-information.bris.ac.uk/ws/files/232644315/cp_16_555_2020.pdf |
geographic |
Antarctic Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet Southern Ocean |
op_source |
Kennedy-Asser , A T , Lunt , D J , Valdes , P J , Ladant , J-B , Frieling , J & Lauretano , V 2020 , ' Changes in the high latitude Southern Hemisphere through the Eocene-Oligocene Transition : a model-data comparison ' , Climate of the Past , vol. 16 , pp. 555-573 . https://doi.org/10.5194/cp-2019-112 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-2019-112 |
_version_ |
1789968701804511232 |