Toward generalized Milankovitch theory (GMT)
In recent decades, numerous paleoclimate records and results of model simulations have provided strong support for the astronomical theory of Quaternary glacial cycles formulated in its modern form by Milutin Milankovitch. At the same time, new findings have revealed that the classical Milankovitch...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00071138 2024-02-11T10:04:55+01:00 Toward generalized Milankovitch theory (GMT) Ganopolski, Andrey 2024-01 electronic https://doi.org/10.5194/cp-20-151-2024 https://noa.gwlb.de/receive/cop_mods_00071138 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069442/cp-20-151-2024.pdf https://cp.copernicus.org/articles/20/151/2024/cp-20-151-2024.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-20-151-2024 https://noa.gwlb.de/receive/cop_mods_00071138 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069442/cp-20-151-2024.pdf https://cp.copernicus.org/articles/20/151/2024/cp-20-151-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/cp-20-151-2024 2024-01-22T00:22:44Z In recent decades, numerous paleoclimate records and results of model simulations have provided strong support for the astronomical theory of Quaternary glacial cycles formulated in its modern form by Milutin Milankovitch. At the same time, new findings have revealed that the classical Milankovitch theory is unable to explain a number of important facts, such as the change in the dominant periodicity of glacial cycles from 41 to 100 kyr about 1 million years ago. This transition was also accompanied by an increase in the amplitude and asymmetry of the glacial cycles. Here, based on the results of a hierarchy of models and data analysis, a framework of the extended (generalized) version of the Milankovitch theory is presented. To illustrate the main elements of this theory, a simple conceptual model of glacial cycles was developed using the results of an Earth system model, CLIMBER-2. This conceptual model explicitly assumes the multistability of the climate–cryosphere system and the instability of the “supercritical” ice sheets. Using this model, it is shown that Quaternary glacial cycles can be successfully reproduced as the strongly nonlinear response of the Earth system to the orbital forcing, where 100 kyr cyclicity originates from the phase locking of the precession and obliquity-forced glacial cycles to the corresponding eccentricity cycle. The eccentricity influences glacial cycles solely through its amplitude modulation of the precession component of orbital forcing, while the long timescale of the late Quaternary glacial cycles is determined by the time required for ice sheets to reach their critical size. The postulates used to construct this conceptual model were justified using analysis of relevant physical and biogeochemical processes and feedbacks. In particular, the role of climate–ice sheet–carbon cycle feedback in shaping and globalization of glacial cycles is discussed. The reasons for the instability of the large northern ice sheets and the mechanisms of the Earth system escape from the ... Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA Climate of the Past 20 1 151 185 |
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article Verlagsveröffentlichung Ganopolski, Andrey Toward generalized Milankovitch theory (GMT) |
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In recent decades, numerous paleoclimate records and results of model simulations have provided strong support for the astronomical theory of Quaternary glacial cycles formulated in its modern form by Milutin Milankovitch. At the same time, new findings have revealed that the classical Milankovitch theory is unable to explain a number of important facts, such as the change in the dominant periodicity of glacial cycles from 41 to 100 kyr about 1 million years ago. This transition was also accompanied by an increase in the amplitude and asymmetry of the glacial cycles. Here, based on the results of a hierarchy of models and data analysis, a framework of the extended (generalized) version of the Milankovitch theory is presented. To illustrate the main elements of this theory, a simple conceptual model of glacial cycles was developed using the results of an Earth system model, CLIMBER-2. This conceptual model explicitly assumes the multistability of the climate–cryosphere system and the instability of the “supercritical” ice sheets. Using this model, it is shown that Quaternary glacial cycles can be successfully reproduced as the strongly nonlinear response of the Earth system to the orbital forcing, where 100 kyr cyclicity originates from the phase locking of the precession and obliquity-forced glacial cycles to the corresponding eccentricity cycle. The eccentricity influences glacial cycles solely through its amplitude modulation of the precession component of orbital forcing, while the long timescale of the late Quaternary glacial cycles is determined by the time required for ice sheets to reach their critical size. The postulates used to construct this conceptual model were justified using analysis of relevant physical and biogeochemical processes and feedbacks. In particular, the role of climate–ice sheet–carbon cycle feedback in shaping and globalization of glacial cycles is discussed. The reasons for the instability of the large northern ice sheets and the mechanisms of the Earth system escape from the ... |
format |
Article in Journal/Newspaper |
author |
Ganopolski, Andrey |
author_facet |
Ganopolski, Andrey |
author_sort |
Ganopolski, Andrey |
title |
Toward generalized Milankovitch theory (GMT) |
title_short |
Toward generalized Milankovitch theory (GMT) |
title_full |
Toward generalized Milankovitch theory (GMT) |
title_fullStr |
Toward generalized Milankovitch theory (GMT) |
title_full_unstemmed |
Toward generalized Milankovitch theory (GMT) |
title_sort |
toward generalized milankovitch theory (gmt) |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-151-2024 https://noa.gwlb.de/receive/cop_mods_00071138 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069442/cp-20-151-2024.pdf https://cp.copernicus.org/articles/20/151/2024/cp-20-151-2024.pdf |
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Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-20-151-2024 https://noa.gwlb.de/receive/cop_mods_00071138 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069442/cp-20-151-2024.pdf https://cp.copernicus.org/articles/20/151/2024/cp-20-151-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-20-151-2024 |
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Climate of the Past |
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20 |
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151 |
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