Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model
Abstract A two-dimensional model which links the atmosphere, the mixed layer of the ocean, the sea ice, the continents, the ice sheets and their underlying bedrock has been used to test the Milankovitch theory over the last glacial—interglacial cycle. It was found that the orbital variations alone c...
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Online Access: | http://dx.doi.org/10.1017/s0022143000015707 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015707 |
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crcambridgeupr:10.1017/s0022143000015707 2024-04-07T07:53:11+00:00 Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model Berger, André Gallée, Hubert Tricot, Christian 1993 http://dx.doi.org/10.1017/s0022143000015707 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015707 en eng Cambridge University Press (CUP) Journal of Glaciology volume 39, issue 131, page 45-49 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0022143000015707 2024-03-08T00:36:17Z Abstract A two-dimensional model which links the atmosphere, the mixed layer of the ocean, the sea ice, the continents, the ice sheets and their underlying bedrock has been used to test the Milankovitch theory over the last glacial—interglacial cycle. It was found that the orbital variations alone can induce, in such a system, feed-backs sufficient to generate the low-frequency part of the climatic variations over the last 122 kyear. These simulated variations at the astronomical time-scale are broadly in agreement with ice volume and sea-level reconstructions independently obtained from geological data. Imperfections in the simulated climate were the insufficient southward extent of the ice sheets and the too small hemispheric cooling during the last glacial maximum. These deficiencies were partly remedied in a further experiment (Gallée and others, in press) by using the time-dependent CO 2 atmospheric concentration given by the Vostok ice core in addition to the astronomical forcing. For this second experiment, the main mechanisms and feedbacks responsible for the glaciation and the deglaciation in the model are discussed here. Article in Journal/Newspaper ice core Ice Sheet Journal of Glaciology Sea ice Cambridge University Press Journal of Glaciology 39 131 45 49 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Berger, André Gallée, Hubert Tricot, Christian Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
topic_facet |
Earth-Surface Processes |
description |
Abstract A two-dimensional model which links the atmosphere, the mixed layer of the ocean, the sea ice, the continents, the ice sheets and their underlying bedrock has been used to test the Milankovitch theory over the last glacial—interglacial cycle. It was found that the orbital variations alone can induce, in such a system, feed-backs sufficient to generate the low-frequency part of the climatic variations over the last 122 kyear. These simulated variations at the astronomical time-scale are broadly in agreement with ice volume and sea-level reconstructions independently obtained from geological data. Imperfections in the simulated climate were the insufficient southward extent of the ice sheets and the too small hemispheric cooling during the last glacial maximum. These deficiencies were partly remedied in a further experiment (Gallée and others, in press) by using the time-dependent CO 2 atmospheric concentration given by the Vostok ice core in addition to the astronomical forcing. For this second experiment, the main mechanisms and feedbacks responsible for the glaciation and the deglaciation in the model are discussed here. |
format |
Article in Journal/Newspaper |
author |
Berger, André Gallée, Hubert Tricot, Christian |
author_facet |
Berger, André Gallée, Hubert Tricot, Christian |
author_sort |
Berger, André |
title |
Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
title_short |
Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
title_full |
Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
title_fullStr |
Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
title_full_unstemmed |
Glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
title_sort |
glaciation and deglaciation mechanisms in a coupled two-dimensional climate—ice-sheet model |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0022143000015707 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015707 |
genre |
ice core Ice Sheet Journal of Glaciology Sea ice |
genre_facet |
ice core Ice Sheet Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 39, issue 131, page 45-49 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000015707 |
container_title |
Journal of Glaciology |
container_volume |
39 |
container_issue |
131 |
container_start_page |
45 |
op_container_end_page |
49 |
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1795668845367656448 |