Evaluating the dominant components of warming in Pliocene climate simulations
The Pliocene Model Intercomparison Project (PlioMIP) is the first coordinated climate model comparison for a warmer palaeoclimate with atmospheric CO 2 significantly higher than pre-industrial concentrations. The simulations of the mid-Pliocene warm period show global warming of between 1.8 and 3.6...
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ftcopernicus:oai:publications.copernicus.org:cp19373 2023-05-15T16:41:16+02:00 Evaluating the dominant components of warming in Pliocene climate simulations Hill, D. J. Haywood, A. M. Lunt, D. J. Hunter, S. J. Bragg, F. J. Contoux, C. Stepanek, C. Sohl, L. Rosenbloom, N. A. Chan, W.-L. Kamae, Y. Zhang, Z. Abe-Ouchi, A. Chandler, M. A. Jost, A. Lohmann, G. Otto-Bliesner, B. L. Ramstein, G. Ueda, H. 2018-09-27 application/pdf https://doi.org/10.5194/cp-10-79-2014 https://cp.copernicus.org/articles/10/79/2014/ eng eng doi:10.5194/cp-10-79-2014 https://cp.copernicus.org/articles/10/79/2014/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-10-79-2014 2020-07-20T16:25:12Z The Pliocene Model Intercomparison Project (PlioMIP) is the first coordinated climate model comparison for a warmer palaeoclimate with atmospheric CO 2 significantly higher than pre-industrial concentrations. The simulations of the mid-Pliocene warm period show global warming of between 1.8 and 3.6 °C above pre-industrial surface air temperatures, with significant polar amplification. Here we perform energy balance calculations on all eight of the coupled ocean–atmosphere simulations within PlioMIP Experiment 2 to evaluate the causes of the increased temperatures and differences between the models. In the tropics simulated warming is dominated by greenhouse gas increases, with the cloud component of planetary albedo enhancing the warming in most of the models, but by widely varying amounts. The responses to mid-Pliocene climate forcing in the Northern Hemisphere midlatitudes are substantially different between the climate models, with the only consistent response being a warming due to increased greenhouse gases. In the high latitudes all the energy balance components become important, but the dominant warming influence comes from the clear sky albedo, only partially offset by the increases in the cooling impact of cloud albedo. This demonstrates the importance of specified ice sheet and high latitude vegetation boundary conditions and simulated sea ice and snow albedo feedbacks. The largest components in the overall uncertainty are associated with clouds in the tropics and polar clear sky albedo, particularly in sea ice regions. These simulations show that albedo feedbacks, particularly those of sea ice and ice sheets, provide the most significant enhancements to high latitude warming in the Pliocene. Text Ice Sheet Sea ice Copernicus Publications: E-Journals Climate of the Past 10 1 79 90 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
The Pliocene Model Intercomparison Project (PlioMIP) is the first coordinated climate model comparison for a warmer palaeoclimate with atmospheric CO 2 significantly higher than pre-industrial concentrations. The simulations of the mid-Pliocene warm period show global warming of between 1.8 and 3.6 °C above pre-industrial surface air temperatures, with significant polar amplification. Here we perform energy balance calculations on all eight of the coupled ocean–atmosphere simulations within PlioMIP Experiment 2 to evaluate the causes of the increased temperatures and differences between the models. In the tropics simulated warming is dominated by greenhouse gas increases, with the cloud component of planetary albedo enhancing the warming in most of the models, but by widely varying amounts. The responses to mid-Pliocene climate forcing in the Northern Hemisphere midlatitudes are substantially different between the climate models, with the only consistent response being a warming due to increased greenhouse gases. In the high latitudes all the energy balance components become important, but the dominant warming influence comes from the clear sky albedo, only partially offset by the increases in the cooling impact of cloud albedo. This demonstrates the importance of specified ice sheet and high latitude vegetation boundary conditions and simulated sea ice and snow albedo feedbacks. The largest components in the overall uncertainty are associated with clouds in the tropics and polar clear sky albedo, particularly in sea ice regions. These simulations show that albedo feedbacks, particularly those of sea ice and ice sheets, provide the most significant enhancements to high latitude warming in the Pliocene. |
format |
Text |
author |
Hill, D. J. Haywood, A. M. Lunt, D. J. Hunter, S. J. Bragg, F. J. Contoux, C. Stepanek, C. Sohl, L. Rosenbloom, N. A. Chan, W.-L. Kamae, Y. Zhang, Z. Abe-Ouchi, A. Chandler, M. A. Jost, A. Lohmann, G. Otto-Bliesner, B. L. Ramstein, G. Ueda, H. |
spellingShingle |
Hill, D. J. Haywood, A. M. Lunt, D. J. Hunter, S. J. Bragg, F. J. Contoux, C. Stepanek, C. Sohl, L. Rosenbloom, N. A. Chan, W.-L. Kamae, Y. Zhang, Z. Abe-Ouchi, A. Chandler, M. A. Jost, A. Lohmann, G. Otto-Bliesner, B. L. Ramstein, G. Ueda, H. Evaluating the dominant components of warming in Pliocene climate simulations |
author_facet |
Hill, D. J. Haywood, A. M. Lunt, D. J. Hunter, S. J. Bragg, F. J. Contoux, C. Stepanek, C. Sohl, L. Rosenbloom, N. A. Chan, W.-L. Kamae, Y. Zhang, Z. Abe-Ouchi, A. Chandler, M. A. Jost, A. Lohmann, G. Otto-Bliesner, B. L. Ramstein, G. Ueda, H. |
author_sort |
Hill, D. J. |
title |
Evaluating the dominant components of warming in Pliocene climate simulations |
title_short |
Evaluating the dominant components of warming in Pliocene climate simulations |
title_full |
Evaluating the dominant components of warming in Pliocene climate simulations |
title_fullStr |
Evaluating the dominant components of warming in Pliocene climate simulations |
title_full_unstemmed |
Evaluating the dominant components of warming in Pliocene climate simulations |
title_sort |
evaluating the dominant components of warming in pliocene climate simulations |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-10-79-2014 https://cp.copernicus.org/articles/10/79/2014/ |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-10-79-2014 https://cp.copernicus.org/articles/10/79/2014/ |
op_doi |
https://doi.org/10.5194/cp-10-79-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
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1 |
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79 |
op_container_end_page |
90 |
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1766031693727137792 |