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...
| Principais autores: | , , , |
|---|---|
| Outros Autores: | |
| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
American Geophysical Union (AGU)
2020
|
| Acesso em linha: | https://hdl.handle.net/1721.1/124846 |
| _version_ | 1826191273869967360 |
|---|---|
| author | Ferreira, David Marshall, John Ito, Takamitsu McGee, David |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ferreira, David Marshall, John Ito, Takamitsu McGee, David |
| author_sort | Ferreira, David |
| collection | MIT |
| 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. |
| first_indexed | 2024-09-23T08:53:19Z |
| format | Article |
| id | mit-1721.1/124846 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:53:19Z |
| publishDate | 2020 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1248462022-09-30T11:58:00Z 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 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. 2020-04-23T21:56:41Z 2020-04-23T21:56:41Z 2018-09 2018-01 2020-04-21T16:56:21Z Article http://purl.org/eprint/type/JournalArticle 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 en 10.1029/2018GL077019 Geophysical Research Letters Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf American Geophysical Union (AGU) American Geophysical Union (AGU) |
| spellingShingle | Ferreira, David Marshall, John Ito, Takamitsu McGee, David Linking Glacial-Interglacial states to multiple equilibria of climate |
| title | 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_short | Linking Glacial-Interglacial states to multiple equilibria of climate |
| title_sort | linking glacial interglacial states to multiple equilibria of climate |
| url | https://hdl.handle.net/1721.1/124846 |
| work_keys_str_mv | AT ferreiradavid linkingglacialinterglacialstatestomultipleequilibriaofclimate AT marshalljohn linkingglacialinterglacialstatestomultipleequilibriaofclimate AT itotakamitsu linkingglacialinterglacialstatestomultipleequilibriaofclimate AT mcgeedavid linkingglacialinterglacialstatestomultipleequilibriaofclimate |