The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles
The origin of the 100 kyr cyclicity, which dominates ice volume variations and other climate records over the past million years, remains debatable. Here, using a comprehensive Earth system model of intermediate complexity, we demonstrate that both strong 100 kyr periodicity in the ice volume variat...
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fttibhannoverren:oai:oa.tib.eu:123456789/627 2024-09-15T18:12:18+00:00 The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles Ganopolski, A. Calov, R. 2011 application/pdf https://oa.tib.eu/renate/handle/123456789/627 https://doi.org/10.34657/1360 eng eng München : European Geopyhsical Union DOI:https://doi.org/10.5194/cp-7-1415-2011 https://doi.org/10.34657/1360 https://oa.tib.eu/renate/handle/123456789/627 CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ frei zugänglich ddc:550 carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume status-type:publishedVersion doc-type:Article doc-type:Text 2011 fttibhannoverren https://doi.org/10.34657/136010.5194/cp-7-1415-2011 2024-06-26T23:32:42Z The origin of the 100 kyr cyclicity, which dominates ice volume variations and other climate records over the past million years, remains debatable. Here, using a comprehensive Earth system model of intermediate complexity, we demonstrate that both strong 100 kyr periodicity in the ice volume variations and the timing of glacial terminations during past 800 kyr can be successfully simulated as direct, strongly nonlinear responses of the climate-cryosphere system to orbital forcing alone, if the atmospheric CO2 concentration stays below its typical interglacial value. The existence of long glacial cycles is primarily attributed to the North American ice sheet and requires the presence of a large continental area with exposed rocks. We show that the sharp, 100 kyr peak in the power spectrum of ice volume results from the long glacial cycles being synchronized with the Earth's orbital eccentricity. Although 100 kyr cyclicity can be simulated with a constant CO2 concentration, temporal variability in the CO2 concentration plays an important role in the amplification of the 100 kyr cycles. Article in Journal/Newspaper Ice Sheet Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
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Open Polar |
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Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
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fttibhannoverren |
language |
English |
topic |
ddc:550 carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume |
spellingShingle |
ddc:550 carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume Ganopolski, A. Calov, R. The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
topic_facet |
ddc:550 carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume |
description |
The origin of the 100 kyr cyclicity, which dominates ice volume variations and other climate records over the past million years, remains debatable. Here, using a comprehensive Earth system model of intermediate complexity, we demonstrate that both strong 100 kyr periodicity in the ice volume variations and the timing of glacial terminations during past 800 kyr can be successfully simulated as direct, strongly nonlinear responses of the climate-cryosphere system to orbital forcing alone, if the atmospheric CO2 concentration stays below its typical interglacial value. The existence of long glacial cycles is primarily attributed to the North American ice sheet and requires the presence of a large continental area with exposed rocks. We show that the sharp, 100 kyr peak in the power spectrum of ice volume results from the long glacial cycles being synchronized with the Earth's orbital eccentricity. Although 100 kyr cyclicity can be simulated with a constant CO2 concentration, temporal variability in the CO2 concentration plays an important role in the amplification of the 100 kyr cycles. |
format |
Article in Journal/Newspaper |
author |
Ganopolski, A. Calov, R. |
author_facet |
Ganopolski, A. Calov, R. |
author_sort |
Ganopolski, A. |
title |
The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
title_short |
The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
title_full |
The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
title_fullStr |
The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
title_full_unstemmed |
The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
title_sort |
role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
publisher |
München : European Geopyhsical Union |
publishDate |
2011 |
url |
https://oa.tib.eu/renate/handle/123456789/627 https://doi.org/10.34657/1360 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
DOI:https://doi.org/10.5194/cp-7-1415-2011 https://doi.org/10.34657/1360 https://oa.tib.eu/renate/handle/123456789/627 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ frei zugänglich |
op_doi |
https://doi.org/10.34657/136010.5194/cp-7-1415-2011 |
_version_ |
1810449885359505408 |