DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data
We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, ∼ 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Model Intercomparison Project (DeepMIP; http://www.deep...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications (EGU)
2021
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Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/51588/ https://oceanrep.geomar.de/id/eprint/51588/1/cp-17-203-2021.pdf https://oceanrep.geomar.de/id/eprint/51588/7/cp-17-203-2021-supplement.zip https://doi.org/10.5194/cp-17-203-2021 |
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ftoceanrep:oai:oceanrep.geomar.de:51588 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, ∼ 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Model Intercomparison Project (DeepMIP; http://www.deepmip.org, last access: 10 January 2021); thus, all models have been configured with the same paleogeographic and vegetation boundary conditions. The results indicate that these non-CO2 boundary conditions contribute between 3 and 5 ∘C to Eocene warmth. Compared with results from previous studies, the DeepMIP simulations generally show a reduced spread of the global mean surface temperature response across the ensemble for a given atmospheric CO2 concentration as well as an increased climate sensitivity on average. An energy balance analysis of the model ensemble indicates that global mean warming in the Eocene compared with the preindustrial period mostly arises from decreases in emissivity due to the elevated CO2 concentration (and associated water vapour and long-wave cloud feedbacks), whereas the reduction in the Eocene in terms of the meridional temperature gradient is primarily due to emissivity and albedo changes owing to the non-CO2 boundary conditions (i.e. the removal of the Antarctic ice sheet and changes in vegetation). Three of the models (the Community Earth System Model, CESM; the Geophysical Fluid Dynamics Laboratory, GFDL, model; and the Norwegian Earth System Model, NorESM) show results that are consistent with the proxies in terms of the global mean temperature, meridional SST gradient, and CO2, without prescribing changes to model parameters. In addition, many of the models agree well with the first-order spatial patterns in the SST proxies. However, at a more regional scale, the models lack skill. In particular, the modelled anomalies are substantially lower than those indicated by the proxies in the southwest Pacific; here, modelled continental surface air temperature anomalies are more consistent ... |
format |
Article in Journal/Newspaper |
author |
Lunt, Daniel Bragg, Fran Chan, Wing-Le Hutchinson, David Ladant, Jean-Baptiste Morozova, Polina Niezgodzki, Igor Steinig, Sebastian Zhang, Zhongshi Zhu, Jiang Abe-Ouchi, Ayako Anagnostou, Eleni de Boer, Agatha Coxall, Helen Donnadieu, Yannick Foster, Gavin Inglis, Gordon Knorr, Gregor Langebroek, Petra Lear, Caroline Lohman, Gerrit Poulsen, Christopher Sepulchre, Pierre Tierney, Jessica Valdes, Paul Volodin, Evgeny Dunkley Jones, Tom Hollis, Christopher Huber, Matthew Otto-Bliesner, Bette |
spellingShingle |
Lunt, Daniel Bragg, Fran Chan, Wing-Le Hutchinson, David Ladant, Jean-Baptiste Morozova, Polina Niezgodzki, Igor Steinig, Sebastian Zhang, Zhongshi Zhu, Jiang Abe-Ouchi, Ayako Anagnostou, Eleni de Boer, Agatha Coxall, Helen Donnadieu, Yannick Foster, Gavin Inglis, Gordon Knorr, Gregor Langebroek, Petra Lear, Caroline Lohman, Gerrit Poulsen, Christopher Sepulchre, Pierre Tierney, Jessica Valdes, Paul Volodin, Evgeny Dunkley Jones, Tom Hollis, Christopher Huber, Matthew Otto-Bliesner, Bette DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
author_facet |
Lunt, Daniel Bragg, Fran Chan, Wing-Le Hutchinson, David Ladant, Jean-Baptiste Morozova, Polina Niezgodzki, Igor Steinig, Sebastian Zhang, Zhongshi Zhu, Jiang Abe-Ouchi, Ayako Anagnostou, Eleni de Boer, Agatha Coxall, Helen Donnadieu, Yannick Foster, Gavin Inglis, Gordon Knorr, Gregor Langebroek, Petra Lear, Caroline Lohman, Gerrit Poulsen, Christopher Sepulchre, Pierre Tierney, Jessica Valdes, Paul Volodin, Evgeny Dunkley Jones, Tom Hollis, Christopher Huber, Matthew Otto-Bliesner, Bette |
author_sort |
Lunt, Daniel |
title |
DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
title_short |
DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
title_full |
DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
title_fullStr |
DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
title_full_unstemmed |
DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
title_sort |
deepmip: model intercomparison of early eocene climatic optimum (eeco) large-scale climate features and comparison with proxy data |
publisher |
Copernicus Publications (EGU) |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/51588/ https://oceanrep.geomar.de/id/eprint/51588/1/cp-17-203-2021.pdf https://oceanrep.geomar.de/id/eprint/51588/7/cp-17-203-2021-supplement.zip https://doi.org/10.5194/cp-17-203-2021 |
geographic |
Antarctic The Antarctic Pacific |
geographic_facet |
Antarctic The Antarctic Pacific |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/51588/1/cp-17-203-2021.pdf https://oceanrep.geomar.de/id/eprint/51588/7/cp-17-203-2021-supplement.zip Lunt, D., Bragg, F., Chan, W. L., Hutchinson, D., Ladant, J. B., Morozova, P., Niezgodzki, I., Steinig, S. , Zhang, Z., Zhu, J., Abe-Ouchi, A., Anagnostou, E. , de Boer, A., Coxall, H., Donnadieu, Y., Foster, G., Inglis, G., Knorr, G., Langebroek, P., Lear, C., Lohman, G., Poulsen, C., Sepulchre, P., Tierney, J., Valdes, P., Volodin, E., Dunkley Jones, T., Hollis, C., Huber, M. and Otto-Bliesner, B. (2021) DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data. Open Access Climate of the Past, 17 (1). pp. 203-227. DOI 10.5194/cp-17-203-2021 <https://doi.org/10.5194/cp-17-203-2021>. doi:10.5194/cp-17-203-2021 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-17-203-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
1 |
container_start_page |
203 |
op_container_end_page |
227 |
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1790609733834506240 |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:51588 2024-02-11T09:57:26+01:00 DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data Lunt, Daniel Bragg, Fran Chan, Wing-Le Hutchinson, David Ladant, Jean-Baptiste Morozova, Polina Niezgodzki, Igor Steinig, Sebastian Zhang, Zhongshi Zhu, Jiang Abe-Ouchi, Ayako Anagnostou, Eleni de Boer, Agatha Coxall, Helen Donnadieu, Yannick Foster, Gavin Inglis, Gordon Knorr, Gregor Langebroek, Petra Lear, Caroline Lohman, Gerrit Poulsen, Christopher Sepulchre, Pierre Tierney, Jessica Valdes, Paul Volodin, Evgeny Dunkley Jones, Tom Hollis, Christopher Huber, Matthew Otto-Bliesner, Bette 2021-01-15 text archive https://oceanrep.geomar.de/id/eprint/51588/ https://oceanrep.geomar.de/id/eprint/51588/1/cp-17-203-2021.pdf https://oceanrep.geomar.de/id/eprint/51588/7/cp-17-203-2021-supplement.zip https://doi.org/10.5194/cp-17-203-2021 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/51588/1/cp-17-203-2021.pdf https://oceanrep.geomar.de/id/eprint/51588/7/cp-17-203-2021-supplement.zip Lunt, D., Bragg, F., Chan, W. L., Hutchinson, D., Ladant, J. B., Morozova, P., Niezgodzki, I., Steinig, S. , Zhang, Z., Zhu, J., Abe-Ouchi, A., Anagnostou, E. , de Boer, A., Coxall, H., Donnadieu, Y., Foster, G., Inglis, G., Knorr, G., Langebroek, P., Lear, C., Lohman, G., Poulsen, C., Sepulchre, P., Tierney, J., Valdes, P., Volodin, E., Dunkley Jones, T., Hollis, C., Huber, M. and Otto-Bliesner, B. (2021) DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data. Open Access Climate of the Past, 17 (1). pp. 203-227. DOI 10.5194/cp-17-203-2021 <https://doi.org/10.5194/cp-17-203-2021>. doi:10.5194/cp-17-203-2021 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.5194/cp-17-203-2021 2024-01-15T00:22:57Z We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, ∼ 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Model Intercomparison Project (DeepMIP; http://www.deepmip.org, last access: 10 January 2021); thus, all models have been configured with the same paleogeographic and vegetation boundary conditions. The results indicate that these non-CO2 boundary conditions contribute between 3 and 5 ∘C to Eocene warmth. Compared with results from previous studies, the DeepMIP simulations generally show a reduced spread of the global mean surface temperature response across the ensemble for a given atmospheric CO2 concentration as well as an increased climate sensitivity on average. An energy balance analysis of the model ensemble indicates that global mean warming in the Eocene compared with the preindustrial period mostly arises from decreases in emissivity due to the elevated CO2 concentration (and associated water vapour and long-wave cloud feedbacks), whereas the reduction in the Eocene in terms of the meridional temperature gradient is primarily due to emissivity and albedo changes owing to the non-CO2 boundary conditions (i.e. the removal of the Antarctic ice sheet and changes in vegetation). Three of the models (the Community Earth System Model, CESM; the Geophysical Fluid Dynamics Laboratory, GFDL, model; and the Norwegian Earth System Model, NorESM) show results that are consistent with the proxies in terms of the global mean temperature, meridional SST gradient, and CO2, without prescribing changes to model parameters. In addition, many of the models agree well with the first-order spatial patterns in the SST proxies. However, at a more regional scale, the models lack skill. In particular, the modelled anomalies are substantially lower than those indicated by the proxies in the southwest Pacific; here, modelled continental surface air temperature anomalies are more consistent ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Pacific Climate of the Past 17 1 203 227 |