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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American Geophysical Union
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ftunivreading:oai:centaur.reading.ac.uk:78472 2024-05-19T07:42:03+00:00 Linking glacial-interglacial states to multiple equilibria of climate Ferreira, David Marshall, John Ito, Takamitsu McGee, David 2018-09-16 text https://centaur.reading.ac.uk/78472/ https://centaur.reading.ac.uk/78472/9/Ferreira_et_al-2018-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/78472/1/Ferreira_etal_18_Accepted.pdf en eng American Geophysical Union https://centaur.reading.ac.uk/78472/9/Ferreira_et_al-2018-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/78472/1/Ferreira_etal_18_Accepted.pdf Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 , Marshall, J., Ito, T. and McGee, D. (2018) Linking glacial-interglacial states to multiple equilibria of climate. Geophysical Research Letters, 45 (17). pp. 9160-9170. ISSN 0094-8276 doi: https://doi.org/10.1029/2018GL077019 <https://doi.org/10.1029/2018GL077019> cc_by_nc_nd_4 Article PeerReviewed 2018 ftunivreading https://doi.org/10.1029/2018GL077019 2024-05-01T00:15:36Z 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 which 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 bi-stability of the ocean's overturning circulation. In addition, expansion/contraction of the Southern Hemisphere ice pack over regions of upwelling, regulating outgassing of CO$_2$ to the atmosphere, is the primary mechanism behind a large pCO$_2$ change between states. Article in Journal/Newspaper ice pack Sea ice CentAUR: Central Archive at the University of Reading Geophysical Research Letters 45 17 9160 9170 |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
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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 which 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 bi-stability of the ocean's overturning circulation. In addition, expansion/contraction of the Southern Hemisphere ice pack over regions of upwelling, regulating outgassing of CO$_2$ to the atmosphere, is the primary mechanism behind a large pCO$_2$ change between states. |
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 |
publishDate |
2018 |
url |
https://centaur.reading.ac.uk/78472/ https://centaur.reading.ac.uk/78472/9/Ferreira_et_al-2018-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/78472/1/Ferreira_etal_18_Accepted.pdf |
genre |
ice pack Sea ice |
genre_facet |
ice pack Sea ice |
op_relation |
https://centaur.reading.ac.uk/78472/9/Ferreira_et_al-2018-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/78472/1/Ferreira_etal_18_Accepted.pdf Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 , Marshall, J., Ito, T. and McGee, D. (2018) Linking glacial-interglacial states to multiple equilibria of climate. Geophysical Research Letters, 45 (17). pp. 9160-9170. ISSN 0094-8276 doi: https://doi.org/10.1029/2018GL077019 <https://doi.org/10.1029/2018GL077019> |
op_rights |
cc_by_nc_nd_4 |
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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1799481666900590592 |