A transient coupled general circulation model(CGCM) simulation of the past 3 million years
Driven primarily by variations in the earth's axis wobble, tilt, and orbit eccentricity, our planet experienced massive glacial/interglacial reorganizations of climate and atmospheric CO2 concentrations during the Pleistocene (2.58 million years ago (Ma)–11.7 thousand years ago (ka)). Even afte...
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ftpotsdamik:oai:publications.pik-potsdam.de:item_29357 2024-06-23T07:53:50+00:00 A transient coupled general circulation model(CGCM) simulation of the past 3 million years Yun, K. Timmermann, A. Lee, S. Willeit, M. Ganopolski, A. Jadhav, J. 2023-10-13 application/pdf https://publications.pik-potsdam.de/pubman/item/item_29357 https://publications.pik-potsdam.de/pubman/item/item_29357_1/component/file_29398/29357oa.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-1951-2023 https://publications.pik-potsdam.de/pubman/item/item_29357 https://publications.pik-potsdam.de/pubman/item/item_29357_1/component/file_29398/29357oa.pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Climate of the Past info:eu-repo/semantics/article 2023 ftpotsdamik https://doi.org/10.5194/cp-19-1951-2023 2024-06-11T14:18:10Z Driven primarily by variations in the earth's axis wobble, tilt, and orbit eccentricity, our planet experienced massive glacial/interglacial reorganizations of climate and atmospheric CO2 concentrations during the Pleistocene (2.58 million years ago (Ma)–11.7 thousand years ago (ka)). Even after decades of research, the underlying climate response mechanisms to these astronomical forcings have not been fully understood. To further quantify the sensitivity of the earth system to orbital-scale forcings, we conducted an unprecedented quasi-continuous coupled general climate model simulation with the Community Earth System Model version 1.2 (CESM1.2, ∼3.75∘ horizontal resolution), which covers the climatic history of the past 3 million years (3 Myr). In addition to the astronomical insolation changes, CESM1.2 is forced by estimates of CO2 and ice-sheet topography which were obtained from a simulation previously conducted with the CLIMBER-2 earth system model of intermediate complexity. Our 3 Ma simulation consists of 42 transient interglacial/glacial simulation chunks, which were partly run in parallel to save computing time. The chunks were subsequently merged, accounting for spin-up and overlap effects to yield a quasi-continuous trajectory. The computer model data were compared against a plethora of paleo-proxy data and large-scale climate reconstructions. For the period from the Mid-Pleistocene Transition (MPT, ∼1 Ma) to the late Pleistocene we find good agreement between simulated and reconstructed temperatures in terms of phase and amplitude (−5.7 ∘C temperature difference between Last Glacial Maximum and Holocene). For the earlier part (3–1 Ma), differences in orbital-scale variability occur between model simulation and the reconstructions, indicating potential biases in the applied CO2 forcing. Our model-proxy data comparison also extends to the westerlies, which show unexpectedly large variance on precessional timescales, and hydroclimate variables in major monsoon regions. Eccentricity-modulated ... Article in Journal/Newspaper Ice Sheet Publication Database PIK (Potsdam Institute for Climate Impact Research) Climate of the Past 19 10 1951 1974 |
institution |
Open Polar |
collection |
Publication Database PIK (Potsdam Institute for Climate Impact Research) |
op_collection_id |
ftpotsdamik |
language |
English |
description |
Driven primarily by variations in the earth's axis wobble, tilt, and orbit eccentricity, our planet experienced massive glacial/interglacial reorganizations of climate and atmospheric CO2 concentrations during the Pleistocene (2.58 million years ago (Ma)–11.7 thousand years ago (ka)). Even after decades of research, the underlying climate response mechanisms to these astronomical forcings have not been fully understood. To further quantify the sensitivity of the earth system to orbital-scale forcings, we conducted an unprecedented quasi-continuous coupled general climate model simulation with the Community Earth System Model version 1.2 (CESM1.2, ∼3.75∘ horizontal resolution), which covers the climatic history of the past 3 million years (3 Myr). In addition to the astronomical insolation changes, CESM1.2 is forced by estimates of CO2 and ice-sheet topography which were obtained from a simulation previously conducted with the CLIMBER-2 earth system model of intermediate complexity. Our 3 Ma simulation consists of 42 transient interglacial/glacial simulation chunks, which were partly run in parallel to save computing time. The chunks were subsequently merged, accounting for spin-up and overlap effects to yield a quasi-continuous trajectory. The computer model data were compared against a plethora of paleo-proxy data and large-scale climate reconstructions. For the period from the Mid-Pleistocene Transition (MPT, ∼1 Ma) to the late Pleistocene we find good agreement between simulated and reconstructed temperatures in terms of phase and amplitude (−5.7 ∘C temperature difference between Last Glacial Maximum and Holocene). For the earlier part (3–1 Ma), differences in orbital-scale variability occur between model simulation and the reconstructions, indicating potential biases in the applied CO2 forcing. Our model-proxy data comparison also extends to the westerlies, which show unexpectedly large variance on precessional timescales, and hydroclimate variables in major monsoon regions. Eccentricity-modulated ... |
format |
Article in Journal/Newspaper |
author |
Yun, K. Timmermann, A. Lee, S. Willeit, M. Ganopolski, A. Jadhav, J. |
spellingShingle |
Yun, K. Timmermann, A. Lee, S. Willeit, M. Ganopolski, A. Jadhav, J. A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
author_facet |
Yun, K. Timmermann, A. Lee, S. Willeit, M. Ganopolski, A. Jadhav, J. |
author_sort |
Yun, K. |
title |
A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
title_short |
A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
title_full |
A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
title_fullStr |
A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
title_full_unstemmed |
A transient coupled general circulation model(CGCM) simulation of the past 3 million years |
title_sort |
transient coupled general circulation model(cgcm) simulation of the past 3 million years |
publishDate |
2023 |
url |
https://publications.pik-potsdam.de/pubman/item/item_29357 https://publications.pik-potsdam.de/pubman/item/item_29357_1/component/file_29398/29357oa.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Climate of the Past |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-1951-2023 https://publications.pik-potsdam.de/pubman/item/item_29357 https://publications.pik-potsdam.de/pubman/item/item_29357_1/component/file_29398/29357oa.pdf |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/cp-19-1951-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
10 |
container_start_page |
1951 |
op_container_end_page |
1974 |
_version_ |
1802645668899061760 |