Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects
One hundred thousand years of ice sheet buildup came to a rapid end ∼25–10 thousand years before present (ka BP), when ice sheets receded quickly and multi-proxy reconstructed global mean surface temperatures rose by ∼3–5 °C. It still remains unresolved whether insolation changes due to variations o...
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ftdoajarticles:oai:doaj.org/article:8fc93c0ef10a4e7aacd84a3f93a14eef 2023-05-15T16:40:00+02:00 Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects M. Heinemann A. Timmermann O. Elison Timm F. Saito A. Abe-Ouchi 2014-08-01T00:00:00Z https://doi.org/10.5194/cp-10-1567-2014 https://doaj.org/article/8fc93c0ef10a4e7aacd84a3f93a14eef EN eng Copernicus Publications http://www.clim-past.net/10/1567/2014/cp-10-1567-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-1567-2014 https://doaj.org/article/8fc93c0ef10a4e7aacd84a3f93a14eef Climate of the Past, Vol 10, Iss 4, Pp 1567-1579 (2014) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/cp-10-1567-2014 2022-12-30T22:33:39Z One hundred thousand years of ice sheet buildup came to a rapid end ∼25–10 thousand years before present (ka BP), when ice sheets receded quickly and multi-proxy reconstructed global mean surface temperatures rose by ∼3–5 °C. It still remains unresolved whether insolation changes due to variations of earth's tilt and orbit were sufficient to terminate glacial conditions. Using a coupled three-dimensional climate–ice sheet model, we simulate the climate and Northern Hemisphere ice sheet evolution from 78 ka BP to 0 ka BP in good agreement with sea level and ice topography reconstructions. Based on this simulation and a series of deglacial sensitivity experiments with individually varying orbital parameters and prescribed CO 2 , we find that enhanced calving led to a slowdown of ice sheet growth as early as ∼8 ka prior to the Last Glacial Maximum (LGM). The glacial termination was then initiated by enhanced ablation due to increasing obliquity and precession, in agreement with the Milankovitch theory. However, our results also support the notion that the ∼100 ppmv rise of atmospheric CO 2 after ∼18 ka BP was a key contributor to the deglaciation. Without it, the present-day ice volume would be comparable to that of the LGM and global mean temperatures would be about 3 °C lower than today. We further demonstrate that neither orbital forcing nor rising CO 2 concentrations alone were sufficient to complete the deglaciation. Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Climate of the Past 10 4 1567 1579 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. Heinemann A. Timmermann O. Elison Timm F. Saito A. Abe-Ouchi Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
One hundred thousand years of ice sheet buildup came to a rapid end ∼25–10 thousand years before present (ka BP), when ice sheets receded quickly and multi-proxy reconstructed global mean surface temperatures rose by ∼3–5 °C. It still remains unresolved whether insolation changes due to variations of earth's tilt and orbit were sufficient to terminate glacial conditions. Using a coupled three-dimensional climate–ice sheet model, we simulate the climate and Northern Hemisphere ice sheet evolution from 78 ka BP to 0 ka BP in good agreement with sea level and ice topography reconstructions. Based on this simulation and a series of deglacial sensitivity experiments with individually varying orbital parameters and prescribed CO 2 , we find that enhanced calving led to a slowdown of ice sheet growth as early as ∼8 ka prior to the Last Glacial Maximum (LGM). The glacial termination was then initiated by enhanced ablation due to increasing obliquity and precession, in agreement with the Milankovitch theory. However, our results also support the notion that the ∼100 ppmv rise of atmospheric CO 2 after ∼18 ka BP was a key contributor to the deglaciation. Without it, the present-day ice volume would be comparable to that of the LGM and global mean temperatures would be about 3 °C lower than today. We further demonstrate that neither orbital forcing nor rising CO 2 concentrations alone were sufficient to complete the deglaciation. |
format |
Article in Journal/Newspaper |
author |
M. Heinemann A. Timmermann O. Elison Timm F. Saito A. Abe-Ouchi |
author_facet |
M. Heinemann A. Timmermann O. Elison Timm F. Saito A. Abe-Ouchi |
author_sort |
M. Heinemann |
title |
Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
title_short |
Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
title_full |
Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
title_fullStr |
Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
title_full_unstemmed |
Deglacial ice sheet meltdown: orbital pacemaking and CO 2 effects |
title_sort |
deglacial ice sheet meltdown: orbital pacemaking and co 2 effects |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-1567-2014 https://doaj.org/article/8fc93c0ef10a4e7aacd84a3f93a14eef |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Climate of the Past, Vol 10, Iss 4, Pp 1567-1579 (2014) |
op_relation |
http://www.clim-past.net/10/1567/2014/cp-10-1567-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-1567-2014 https://doaj.org/article/8fc93c0ef10a4e7aacd84a3f93a14eef |
op_doi |
https://doi.org/10.5194/cp-10-1567-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
4 |
container_start_page |
1567 |
op_container_end_page |
1579 |
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