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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ftleibnizopen:oai:oai.leibnizopen.de:xJNR04kBdbrxVwz6yAJ9 2023-10-01T03:56:41+02:00 The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles Ganopolski, A. Calov, R. 2011 application/pdf https://doi.org/10.34657/1360 https://oa.tib.eu/renate/handle/123456789/627 eng eng München : European Geopyhsical Union CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Climate of the Past, Volume 7, Issue 4, Page 1415-1425 carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume 550 article Text 2011 ftleibnizopen https://doi.org/10.34657/1360 2023-09-03T23:17:23Z 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. publishedVersion Article in Journal/Newspaper Ice Sheet LeibnizOpen (The Leibniz Association) |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume 550 |
spellingShingle |
carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume 550 Ganopolski, A. Calov, R. The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles |
topic_facet |
carbon dioxide concentration (composition) cryosphere glacial environment ice sheet nonlinearity orbital forcing paleoclimate paleoenvironment periodicity regolith volume 550 |
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. publishedVersion |
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://doi.org/10.34657/1360 https://oa.tib.eu/renate/handle/123456789/627 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Climate of the Past, Volume 7, Issue 4, Page 1415-1425 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.34657/1360 |
_version_ |
1778526745933119488 |