Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet
The hysteresis behaviour of ice sheets arises because of the different thresholds for growth and decline of a continental-scale ice sheet depending on the initial conditions. In this study, the hysteresis effect of the early Cenozoic Antarctic ice sheet to different bedrock elevations is investigate...
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Online Access: | http://hdl.handle.net/2078.1/283175 https://doi.org/10.5194/cp-19-2551-2023 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:283175 2024-05-12T07:56:29+00:00 Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet Van Breedam, Jonas Huybrechts, Philippe Crucifix, Michel UCL - SST/ELI/ELIC - Earth & Climate 2023 http://hdl.handle.net/2078.1/283175 https://doi.org/10.5194/cp-19-2551-2023 eng eng Copernicus GmbH boreal:283175 http://hdl.handle.net/2078.1/283175 doi:10.5194/cp-19-2551-2023 urn:EISSN:1814-9332 info:eu-repo/semantics/openAccess Climate of the Past, Vol. 19, no.12, p. 2551-2568 (2023) Paleontology Stratigraphy Global and Planetary Change info:eu-repo/semantics/article 2023 ftunivlouvain https://doi.org/10.5194/cp-19-2551-2023 2024-04-17T16:27:27Z The hysteresis behaviour of ice sheets arises because of the different thresholds for growth and decline of a continental-scale ice sheet depending on the initial conditions. In this study, the hysteresis effect of the early Cenozoic Antarctic ice sheet to different bedrock elevations is investigated with an improved ice sheet–climate coupling method that accurately captures the ice–albedo feedback. It is shown that the hysteresis effect of the early Cenozoic Antarctic ice sheet is ∼180 ppmv or between 3.5 and 5 ∘C, depending only weakly on the bedrock elevation dataset. Excluding isostatic adjustment decreases the hysteresis effect significantly towards ∼40 ppmv because the transition to a glacial state can occur at a warmer level. The rapid transition from a glacial to a deglacial state and oppositely from deglacial to glacial conditions is strongly enhanced by the ice–albedo feedback, in combination with the elevation–surface mass balance feedback. Variations in the orbital parameters show that extreme values of the orbital parameters are able to exceed the threshold in summer insolation to induce a (de)glaciation. It appears that the long-term eccentricity cycle has a large influence on the ice sheet growth and decline and is able to pace the ice sheet evolution for constant CO2 concentration close to the glaciation threshold. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet DIAL@UCLouvain (Université catholique de Louvain) Antarctic Climate of the Past 19 12 2551 2568 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Paleontology Stratigraphy Global and Planetary Change |
spellingShingle |
Paleontology Stratigraphy Global and Planetary Change Van Breedam, Jonas Huybrechts, Philippe Crucifix, Michel Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
topic_facet |
Paleontology Stratigraphy Global and Planetary Change |
description |
The hysteresis behaviour of ice sheets arises because of the different thresholds for growth and decline of a continental-scale ice sheet depending on the initial conditions. In this study, the hysteresis effect of the early Cenozoic Antarctic ice sheet to different bedrock elevations is investigated with an improved ice sheet–climate coupling method that accurately captures the ice–albedo feedback. It is shown that the hysteresis effect of the early Cenozoic Antarctic ice sheet is ∼180 ppmv or between 3.5 and 5 ∘C, depending only weakly on the bedrock elevation dataset. Excluding isostatic adjustment decreases the hysteresis effect significantly towards ∼40 ppmv because the transition to a glacial state can occur at a warmer level. The rapid transition from a glacial to a deglacial state and oppositely from deglacial to glacial conditions is strongly enhanced by the ice–albedo feedback, in combination with the elevation–surface mass balance feedback. Variations in the orbital parameters show that extreme values of the orbital parameters are able to exceed the threshold in summer insolation to induce a (de)glaciation. It appears that the long-term eccentricity cycle has a large influence on the ice sheet growth and decline and is able to pace the ice sheet evolution for constant CO2 concentration close to the glaciation threshold. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Van Breedam, Jonas Huybrechts, Philippe Crucifix, Michel |
author_facet |
Van Breedam, Jonas Huybrechts, Philippe Crucifix, Michel |
author_sort |
Van Breedam, Jonas |
title |
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
title_short |
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
title_full |
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
title_fullStr |
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
title_full_unstemmed |
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet |
title_sort |
hysteresis and orbital pacing of the early cenozoic antarctic ice sheet |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
http://hdl.handle.net/2078.1/283175 https://doi.org/10.5194/cp-19-2551-2023 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Climate of the Past, Vol. 19, no.12, p. 2551-2568 (2023) |
op_relation |
boreal:283175 http://hdl.handle.net/2078.1/283175 doi:10.5194/cp-19-2551-2023 urn:EISSN:1814-9332 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-19-2551-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
12 |
container_start_page |
2551 |
op_container_end_page |
2568 |
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