On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times
A mechanism is proposed for the mid-Pleistocene transition from a dominant periodicity of 41 kyr to 100 kyr in glacial oscillations. The same mechanism is shown to also explain the asymmetry between the long glaciation and short deglaciation phases of each cycle since that transition versus the symm...
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Language: | English |
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American Geophysical Union
2003
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Online Access: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440411 https://doi.org/10.1029/2001PA000627 |
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ftharvardudash:oai:dash.harvard.edu:1/3440411 2023-05-15T16:41:05+02:00 On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times Tziperman, Eli Gildor, Hezi 2003 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440411 https://doi.org/10.1029/2001PA000627 en_US eng American Geophysical Union http://dx.doi.org/10.1029/2001PA000627 http://www.agu.org/pubs/sample_articles/cr/2001PA000627/2001PA000627.pdf http://www.weizmann.ac.il/ESER/People/Hezi/Tziperman-Gildor-2003.pdf Paleoceanography Tziperman, Eli, and Hezi Gildor. 2003. The mid-Pleistocene climate transition to 100-kyr glacial cycles and the source of asymmetry between glaciation and deglaciation times. Paleoceanography, 18(1): 1001. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440411 doi:10.1029/2001PA000627 Journal Article 2003 ftharvardudash https://doi.org/10.1029/2001PA000627 2022-04-04T12:36:29Z A mechanism is proposed for the mid-Pleistocene transition from a dominant periodicity of 41 kyr to 100 kyr in glacial oscillations. The same mechanism is shown to also explain the asymmetry between the long glaciation and short deglaciation phases of each cycle since that transition versus the symmetry of the 41-kyr oscillations prior to the transition. These features arise naturally within the framework of the sea-ice switch glacial cycle mechanism of Gildor and Tziperman [2000] as a result of the gradual cooling of the deep ocean during the Pleistocene. This cooling results in a change of the relation between atmospheric temperature and the rates of accumulation and ablation of continentals ice sheets. It is this latter change that leads to the activation of the sea-ice switch and therefore to the initiation of the 100-kyr oscillations. The gradual glaciation and rapid deglaciations during these oscillations occur because the mean value of the ice sheet ablation is not far from the maximum rate of snow accumulation during warm periods. This proximity of mean ablation and maximum accumulation rates is shown to be also a consequence of the mid-Pleistocene gradual cooling of the deep ocean. Earth and Planetary Sciences Version of Record Article in Journal/Newspaper Ice Sheet Sea ice Harvard University: DASH - Digital Access to Scholarship at Harvard Paleoceanography 18 1 1-1 1-8 |
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Open Polar |
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Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
A mechanism is proposed for the mid-Pleistocene transition from a dominant periodicity of 41 kyr to 100 kyr in glacial oscillations. The same mechanism is shown to also explain the asymmetry between the long glaciation and short deglaciation phases of each cycle since that transition versus the symmetry of the 41-kyr oscillations prior to the transition. These features arise naturally within the framework of the sea-ice switch glacial cycle mechanism of Gildor and Tziperman [2000] as a result of the gradual cooling of the deep ocean during the Pleistocene. This cooling results in a change of the relation between atmospheric temperature and the rates of accumulation and ablation of continentals ice sheets. It is this latter change that leads to the activation of the sea-ice switch and therefore to the initiation of the 100-kyr oscillations. The gradual glaciation and rapid deglaciations during these oscillations occur because the mean value of the ice sheet ablation is not far from the maximum rate of snow accumulation during warm periods. This proximity of mean ablation and maximum accumulation rates is shown to be also a consequence of the mid-Pleistocene gradual cooling of the deep ocean. Earth and Planetary Sciences Version of Record |
format |
Article in Journal/Newspaper |
author |
Tziperman, Eli Gildor, Hezi |
spellingShingle |
Tziperman, Eli Gildor, Hezi On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
author_facet |
Tziperman, Eli Gildor, Hezi |
author_sort |
Tziperman, Eli |
title |
On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
title_short |
On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
title_full |
On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
title_fullStr |
On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
title_full_unstemmed |
On the Mid-Pleistocene Transition to 100-kyr Glacial Cycles and the Asymmetry Between Glaciation and Deglaciation Times |
title_sort |
on the mid-pleistocene transition to 100-kyr glacial cycles and the asymmetry between glaciation and deglaciation times |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440411 https://doi.org/10.1029/2001PA000627 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_relation |
http://dx.doi.org/10.1029/2001PA000627 http://www.agu.org/pubs/sample_articles/cr/2001PA000627/2001PA000627.pdf http://www.weizmann.ac.il/ESER/People/Hezi/Tziperman-Gildor-2003.pdf Paleoceanography Tziperman, Eli, and Hezi Gildor. 2003. The mid-Pleistocene climate transition to 100-kyr glacial cycles and the source of asymmetry between glaciation and deglaciation times. Paleoceanography, 18(1): 1001. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440411 doi:10.1029/2001PA000627 |
op_doi |
https://doi.org/10.1029/2001PA000627 |
container_title |
Paleoceanography |
container_volume |
18 |
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1 |
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1-1 |
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1-8 |
_version_ |
1766031519869042688 |