Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation
The atmospheric concentration of CO 2 increased from 190 to 280 ppm between the last glacial maximum 21,000 years ago and the pre-industrial era. This CO 2 rise and its timing have been linked to changes in the Earth's orbit, ice sheet configuration and volume, and ocean carbon storage. The ice...
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2022
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ftinfoscience:oai:infoscience.epfl.ch:298364 2023-05-15T16:37:00+02:00 Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation Crichton, K. A. Bouttes, N. Roche, D. M. Chappellaz, J. Krinner, G. 2022-11-23T16:11:53Z https://doi.org/10.1038/ngeo2793 http://infoscience.epfl.ch/record/298364 unknown New York, Springer Science and Business Media LLC doi:10.1038/ngeo2793 isi:000383283700012 http://infoscience.epfl.ch/record/298364 http://infoscience.epfl.ch/record/298364 Text 2022 ftinfoscience https://doi.org/10.1038/ngeo2793 2023-02-13T23:12:34Z The atmospheric concentration of CO 2 increased from 190 to 280 ppm between the last glacial maximum 21,000 years ago and the pre-industrial era. This CO 2 rise and its timing have been linked to changes in the Earth's orbit, ice sheet configuration and volume, and ocean carbon storage. The ice-core record of Í 13 CO 2 (refs,) in the atmosphere can help to constrain the source of carbon, but previous modelling studies have failed to capture the evolution of Í 13 CO 2 over this period. Here we show that simulations of the last deglaciation that include a permafrost carbon component can reproduce the ice core records between 21,000 and 10,000 years ago. We suggest that thawing permafrost, due to increasing summer insolation in the northern hemisphere, is the main source of CO 2 rise between 17,500 and 15,000 years ago, a period sometimes referred to as the Mystery Interval. Together with a fresh water release into the North Atlantic, much of the CO 2 variability associated with the Bølling-Allerod/Younger Dryas period â 1/415,000 to â 1/412,000 years ago can also be explained. In simulations of future warming we find that the permafrost carbon feedback increases global mean temperature by 10-40% relative to simulations without this feedback, with the magnitude of the increase dependent on the evolution of anthropogenic carbon emissions. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Text Ice ice core Ice Sheet North Atlantic permafrost EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Nature Geoscience 9 9 683 686 |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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The atmospheric concentration of CO 2 increased from 190 to 280 ppm between the last glacial maximum 21,000 years ago and the pre-industrial era. This CO 2 rise and its timing have been linked to changes in the Earth's orbit, ice sheet configuration and volume, and ocean carbon storage. The ice-core record of Í 13 CO 2 (refs,) in the atmosphere can help to constrain the source of carbon, but previous modelling studies have failed to capture the evolution of Í 13 CO 2 over this period. Here we show that simulations of the last deglaciation that include a permafrost carbon component can reproduce the ice core records between 21,000 and 10,000 years ago. We suggest that thawing permafrost, due to increasing summer insolation in the northern hemisphere, is the main source of CO 2 rise between 17,500 and 15,000 years ago, a period sometimes referred to as the Mystery Interval. Together with a fresh water release into the North Atlantic, much of the CO 2 variability associated with the Bølling-Allerod/Younger Dryas period â 1/415,000 to â 1/412,000 years ago can also be explained. In simulations of future warming we find that the permafrost carbon feedback increases global mean temperature by 10-40% relative to simulations without this feedback, with the magnitude of the increase dependent on the evolution of anthropogenic carbon emissions. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
format |
Text |
author |
Crichton, K. A. Bouttes, N. Roche, D. M. Chappellaz, J. Krinner, G. |
spellingShingle |
Crichton, K. A. Bouttes, N. Roche, D. M. Chappellaz, J. Krinner, G. Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
author_facet |
Crichton, K. A. Bouttes, N. Roche, D. M. Chappellaz, J. Krinner, G. |
author_sort |
Crichton, K. A. |
title |
Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
title_short |
Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
title_full |
Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
title_fullStr |
Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
title_full_unstemmed |
Permafrost carbon as a missing link to explain CO 2 changes during the last deglaciation |
title_sort |
permafrost carbon as a missing link to explain co 2 changes during the last deglaciation |
publisher |
New York, Springer Science and Business Media LLC |
publishDate |
2022 |
url |
https://doi.org/10.1038/ngeo2793 http://infoscience.epfl.ch/record/298364 |
genre |
Ice ice core Ice Sheet North Atlantic permafrost |
genre_facet |
Ice ice core Ice Sheet North Atlantic permafrost |
op_source |
http://infoscience.epfl.ch/record/298364 |
op_relation |
doi:10.1038/ngeo2793 isi:000383283700012 http://infoscience.epfl.ch/record/298364 |
op_doi |
https://doi.org/10.1038/ngeo2793 |
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Nature Geoscience |
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9 |
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9 |
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683 |
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686 |
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