Linking Glacial-Interglacial states to multiple equilibria of climate
Glacial-interglacial cycles are often described as an amplified global response of the climate to perturbations in solar radiation caused by oscillations of Earth's orbit. However, it remains unclear whether internal feedbacks are large enough to account for the radically different glacial and...
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ftmit:oai:dspace.mit.edu:1721.1/124846 2023-06-11T04:12:44+02:00 Linking Glacial-Interglacial states to multiple equilibria of climate Ferreira, David Marshall, John Ito, Takamitsu McGee, David Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Program in Atmospheres, Oceans, and Climate 2020-04-21T16:56:21Z application/pdf https://hdl.handle.net/1721.1/124846 en eng American Geophysical Union (AGU) 10.1029/2018GL077019 Geophysical Research Letters 1944-8007 https://hdl.handle.net/1721.1/124846 Ferreira, David et. al., "Linking Glacial‐Interglacial States to Multiple Equilibria of Climate." Geophysical Research Letters 45, 17 (September 2018): 9160-70 doi. 10.1029/2018GL077019 ©2018 Authors Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ American Geophysical Union (AGU) Article http://purl.org/eprint/type/JournalArticle 2020 ftmit https://doi.org/10.1029/2018GL077019 2023-05-29T07:29:48Z Glacial-interglacial cycles are often described as an amplified global response of the climate to perturbations in solar radiation caused by oscillations of Earth's orbit. However, it remains unclear whether internal feedbacks are large enough to account for the radically different glacial and interglacial states. Here we provide support for an alternative view: Glacial-interglacial states are multiple equilibria of the climate system that exist for the same external forcing. We show that such multiple equilibria resembling glacial and interglacial states can be found in a complex coupled general circulation model of the ocean-atmosphere-sea ice system. The multiple states are sustained by ice-albedo feedback modified by ocean heat transport and are not caused by the bistability of the ocean's overturning circulation. In addition, expansion/contraction of the Southern Hemisphere ice pack over regions of upwelling, regulating outgassing of CO2 to the atmosphere, is the primary mechanism behind a large pCO2 change between states. ©2018. The Authors. Article in Journal/Newspaper ice pack Sea ice DSpace@MIT (Massachusetts Institute of Technology) Geophysical Research Letters 45 17 9160 9170 |
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English |
description |
Glacial-interglacial cycles are often described as an amplified global response of the climate to perturbations in solar radiation caused by oscillations of Earth's orbit. However, it remains unclear whether internal feedbacks are large enough to account for the radically different glacial and interglacial states. Here we provide support for an alternative view: Glacial-interglacial states are multiple equilibria of the climate system that exist for the same external forcing. We show that such multiple equilibria resembling glacial and interglacial states can be found in a complex coupled general circulation model of the ocean-atmosphere-sea ice system. The multiple states are sustained by ice-albedo feedback modified by ocean heat transport and are not caused by the bistability of the ocean's overturning circulation. In addition, expansion/contraction of the Southern Hemisphere ice pack over regions of upwelling, regulating outgassing of CO2 to the atmosphere, is the primary mechanism behind a large pCO2 change between states. ©2018. The Authors. |
author2 |
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Program in Atmospheres, Oceans, and Climate |
format |
Article in Journal/Newspaper |
author |
Ferreira, David Marshall, John Ito, Takamitsu McGee, David |
spellingShingle |
Ferreira, David Marshall, John Ito, Takamitsu McGee, David Linking Glacial-Interglacial states to multiple equilibria of climate |
author_facet |
Ferreira, David Marshall, John Ito, Takamitsu McGee, David |
author_sort |
Ferreira, David |
title |
Linking Glacial-Interglacial states to multiple equilibria of climate |
title_short |
Linking Glacial-Interglacial states to multiple equilibria of climate |
title_full |
Linking Glacial-Interglacial states to multiple equilibria of climate |
title_fullStr |
Linking Glacial-Interglacial states to multiple equilibria of climate |
title_full_unstemmed |
Linking Glacial-Interglacial states to multiple equilibria of climate |
title_sort |
linking glacial-interglacial states to multiple equilibria of climate |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://hdl.handle.net/1721.1/124846 |
genre |
ice pack Sea ice |
genre_facet |
ice pack Sea ice |
op_source |
American Geophysical Union (AGU) |
op_relation |
10.1029/2018GL077019 Geophysical Research Letters 1944-8007 https://hdl.handle.net/1721.1/124846 Ferreira, David et. al., "Linking Glacial‐Interglacial States to Multiple Equilibria of Climate." Geophysical Research Letters 45, 17 (September 2018): 9160-70 doi. 10.1029/2018GL077019 ©2018 Authors |
op_rights |
Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2018GL077019 |
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Geophysical Research Letters |
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45 |
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17 |
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9160 |
op_container_end_page |
9170 |
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1768388784742727680 |