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, similar to 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Model Intercomparison Project (DeepMIP; http:/...
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2021
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Online Access: | https://doi.org/10.5194/cp-17-203-2021 |
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ftncar:oai:drupal-site.org:articles_24144 2024-04-28T08:01:34+00:00 DeepMIP: Model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data Lunt, Daniel J. (author) Bragg, Fran (author) Chan, Wing-Le (author) Hutchinson, David K. (author) Ladant, Jean-Baptiste (author) Morozova, Polina (author) Niezgodzki, Igor (author) Steinig, Sebastian (author) Zhang, Zhongshi (author) Zhu, Jiang (author) Abe-Ouchi, Ayako (author) Anagnostou, Eleni (author) de Boer, Agatha M. (author) Coxall, Helen K. (author) Donnadieu, Yannick (author) Foster, Gavin (author) Inglis, Gordon N. (author) Knorr, Gregor (author) Langebroek, Petra M. (author) Lear, Caroline H. (author) Lohmann, Gerrit (author) Poulsen, Christopher J. (author) Sepulchre, Pierre (author) Tierney, Jessica E. (author) Valdes, Paul J. (author) Volodin, Evgeny M. (author) Dunkley Jones, Tom (author) Hollis, Christopher J. (author) Huber, Matthew (author) Otto-Bliesner, Bette L. (author) 2021-01-15 https://doi.org/10.5194/cp-17-203-2021 en eng Climate of the Past--Clim. Past--1814-9332 articles:24144 ark:/85065/d7q243m5 doi:10.5194/cp-17-203-2021 Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2021 ftncar https://doi.org/10.5194/cp-17-203-2021 2024-04-04T17:32:42Z We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, similar to 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 degrees 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 ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Climate of the Past 17 1 203 227 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
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, similar to 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 degrees 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 ... |
author2 |
Lunt, Daniel J. (author) Bragg, Fran (author) Chan, Wing-Le (author) Hutchinson, David K. (author) Ladant, Jean-Baptiste (author) Morozova, Polina (author) Niezgodzki, Igor (author) Steinig, Sebastian (author) Zhang, Zhongshi (author) Zhu, Jiang (author) Abe-Ouchi, Ayako (author) Anagnostou, Eleni (author) de Boer, Agatha M. (author) Coxall, Helen K. (author) Donnadieu, Yannick (author) Foster, Gavin (author) Inglis, Gordon N. (author) Knorr, Gregor (author) Langebroek, Petra M. (author) Lear, Caroline H. (author) Lohmann, Gerrit (author) Poulsen, Christopher J. (author) Sepulchre, Pierre (author) Tierney, Jessica E. (author) Valdes, Paul J. (author) Volodin, Evgeny M. (author) Dunkley Jones, Tom (author) Hollis, Christopher J. (author) Huber, Matthew (author) Otto-Bliesner, Bette L. (author) |
format |
Article in Journal/Newspaper |
title |
DeepMIP: Model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data |
spellingShingle |
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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-203-2021 |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
Climate of the Past--Clim. Past--1814-9332 articles:24144 ark:/85065/d7q243m5 doi:10.5194/cp-17-203-2021 |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
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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1797573252867948544 |