Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model
<p>Over the Quaternary, ice volume variations are “paced” by astronomy. However, the precise way in which the astronomical parameters influence the glacial–interglacial cycles is not clear. The origin of the 100 kyr cycles over the last 1 million years and of the switch from 40 to 100 kyr cycl...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-03-01
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| Series: | Climate of the Past |
| Online Access: | https://cp.copernicus.org/articles/18/547/2022/cp-18-547-2022.pdf |
| _version_ | 1818356685450772480 |
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| author | G. Leloup G. Leloup D. Paillard |
| author_facet | G. Leloup G. Leloup D. Paillard |
| author_sort | G. Leloup |
| collection | DOAJ |
| description | <p>Over the Quaternary, ice volume variations are “paced” by astronomy. However, the precise way in which the astronomical parameters influence the glacial–interglacial cycles is not clear. The origin of the 100 kyr cycles over the last 1 million years and of the switch from 40 to 100 kyr cycles over the Mid-Pleistocene Transition (MPT) remain largely unexplained.
By representing the climate system as oscillating between two states, glaciation and deglaciation, switching once glaciation and deglaciation thresholds are crossed, the main features of the ice volume record can be reproduced <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx46">Parrenin and Paillard</a>, <a href="#bib1.bibx46">2012</a>)</span>.
However, previous studies have only focused on the use of a single summer insolation as input.
Here, we use a simple conceptual model to test and discuss the influence of the use of different summer insolation forcings, having different contributions from precession and obliquity, on the model results.
We show that some features are robust. Specifically, to be able to reproduce the frequency shift over the MPT, while having all other model parameters fixed, the deglaciation threshold needs to increase over time, independently of the summer insolation used as input. The quality of the model–data agreement however depends on the chosen type of summer insolation and time period considered.</p> |
| first_indexed | 2024-12-13T20:01:08Z |
| format | Article |
| id | doaj.art-05218377d7f0438d8cfda5ca0610040f |
| institution | Directory Open Access Journal |
| issn | 1814-9324 1814-9332 |
| language | English |
| last_indexed | 2024-12-13T20:01:08Z |
| publishDate | 2022-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Climate of the Past |
| spelling | doaj.art-05218377d7f0438d8cfda5ca0610040f2022-12-21T23:33:11ZengCopernicus PublicationsClimate of the Past1814-93241814-93322022-03-011854755810.5194/cp-18-547-2022Influence of the choice of insolation forcing on the results of a conceptual glacial cycle modelG. Leloup0G. Leloup1D. Paillard2Agence Nationale pour la gestion des déchets radioactifs (ANDRA), 1 Rue Jean Monnet, 92290 Châtenay-Malabry, FranceLaboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris-Saclay, 91198 Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris-Saclay, 91198 Gif-sur-Yvette, France<p>Over the Quaternary, ice volume variations are “paced” by astronomy. However, the precise way in which the astronomical parameters influence the glacial–interglacial cycles is not clear. The origin of the 100 kyr cycles over the last 1 million years and of the switch from 40 to 100 kyr cycles over the Mid-Pleistocene Transition (MPT) remain largely unexplained. By representing the climate system as oscillating between two states, glaciation and deglaciation, switching once glaciation and deglaciation thresholds are crossed, the main features of the ice volume record can be reproduced <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx46">Parrenin and Paillard</a>, <a href="#bib1.bibx46">2012</a>)</span>. However, previous studies have only focused on the use of a single summer insolation as input. Here, we use a simple conceptual model to test and discuss the influence of the use of different summer insolation forcings, having different contributions from precession and obliquity, on the model results. We show that some features are robust. Specifically, to be able to reproduce the frequency shift over the MPT, while having all other model parameters fixed, the deglaciation threshold needs to increase over time, independently of the summer insolation used as input. The quality of the model–data agreement however depends on the chosen type of summer insolation and time period considered.</p>https://cp.copernicus.org/articles/18/547/2022/cp-18-547-2022.pdf |
| spellingShingle | G. Leloup G. Leloup D. Paillard Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model Climate of the Past |
| title | Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| title_full | Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| title_fullStr | Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| title_full_unstemmed | Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| title_short | Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| title_sort | influence of the choice of insolation forcing on the results of a conceptual glacial cycle model |
| url | https://cp.copernicus.org/articles/18/547/2022/cp-18-547-2022.pdf |
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