Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials
Atmospheric CO2 levels during interglacials prior to the Mid-Brunhes Event (MBE, similar to 430 kaBP) were around 40 ppm lower than after the MBE. The reasons for this difference remain unclear. A recent hypothesis proposed that changes in oceanic circulation, in response to different external forci...
Published in: | Climate of the Past |
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Copernicus Gesellschaft Mbh
2018
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ftarchimer:oai:archimer.ifremer.fr:60821 2023-05-15T16:37:47+02:00 Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials Bouttes, Nathaelle Swingedouw, Didier Roche, Didier M. Sanchez-goni, Maria F. Crosta, Xavier 2018-03 application/pdf https://archimer.ifremer.fr/doc/00497/60821/65114.pdf https://archimer.ifremer.fr/doc/00497/60821/65115.pdf https://archimer.ifremer.fr/doc/00497/60821/65116.zip https://doi.org/10.5194/cp-14-239-2018 https://archimer.ifremer.fr/doc/00497/60821/ eng eng Copernicus Gesellschaft Mbh info:eu-repo/grantAgreement/EC/H2020/656625/EU//CHOCOLATE https://archimer.ifremer.fr/doc/00497/60821/65114.pdf https://archimer.ifremer.fr/doc/00497/60821/65115.pdf https://archimer.ifremer.fr/doc/00497/60821/65116.zip doi:10.5194/cp-14-239-2018 https://archimer.ifremer.fr/doc/00497/60821/ info:eu-repo/semantics/openAccess restricted use Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2018-03 , Vol. 14 , N. 2 , P. 239-253 text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.5194/cp-14-239-2018 2021-09-23T20:32:46Z Atmospheric CO2 levels during interglacials prior to the Mid-Brunhes Event (MBE, similar to 430 kaBP) were around 40 ppm lower than after the MBE. The reasons for this difference remain unclear. A recent hypothesis proposed that changes in oceanic circulation, in response to different external forcings before and after the MBE, might have increased the ocean carbon storage in pre-MBE interglacials, thus lowering atmospheric CO2. Nevertheless, no quantitative estimate of this hypothesis has been produced up to now. Here we use an intermediate complexity model including the carbon cycle to evaluate the response of the carbon reservoirs in the atmosphere, ocean and land in response to the changes of orbital forcings, ice sheet configurations and atmospheric CO2 concentrations over the last nine interglacials. We show that the ocean takes up more carbon during pre-MBE interglacials in agreement with data, but the impact on atmospheric CO2 is limited to a few parts per million. Terrestrial biosphere is simulated to be less developed in pre-MBE interglacials, which reduces the storage of carbon on land and increases atmospheric CO2. Accounting for different simulated ice sheet extents modifies the vegetation cover and temperature, and thus the carbon reservoir distribution. Overall, atmospheric CO2 levels are lower during these pre-MBE simulated interglacials including all these effects, but the magnitude is still far too small. These results suggest a possible misrepresentation of some key processes in the model, such as the magnitude of ocean circulation changes, or the lack of crucial mechanisms or internal feedbacks, such as those related to permafrost, to fully account for the lower atmospheric CO2 concentrations during pre-MBE interglacials. Article in Journal/Newspaper Ice Ice Sheet permafrost Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Climate of the Past 14 2 239 253 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Atmospheric CO2 levels during interglacials prior to the Mid-Brunhes Event (MBE, similar to 430 kaBP) were around 40 ppm lower than after the MBE. The reasons for this difference remain unclear. A recent hypothesis proposed that changes in oceanic circulation, in response to different external forcings before and after the MBE, might have increased the ocean carbon storage in pre-MBE interglacials, thus lowering atmospheric CO2. Nevertheless, no quantitative estimate of this hypothesis has been produced up to now. Here we use an intermediate complexity model including the carbon cycle to evaluate the response of the carbon reservoirs in the atmosphere, ocean and land in response to the changes of orbital forcings, ice sheet configurations and atmospheric CO2 concentrations over the last nine interglacials. We show that the ocean takes up more carbon during pre-MBE interglacials in agreement with data, but the impact on atmospheric CO2 is limited to a few parts per million. Terrestrial biosphere is simulated to be less developed in pre-MBE interglacials, which reduces the storage of carbon on land and increases atmospheric CO2. Accounting for different simulated ice sheet extents modifies the vegetation cover and temperature, and thus the carbon reservoir distribution. Overall, atmospheric CO2 levels are lower during these pre-MBE simulated interglacials including all these effects, but the magnitude is still far too small. These results suggest a possible misrepresentation of some key processes in the model, such as the magnitude of ocean circulation changes, or the lack of crucial mechanisms or internal feedbacks, such as those related to permafrost, to fully account for the lower atmospheric CO2 concentrations during pre-MBE interglacials. |
format |
Article in Journal/Newspaper |
author |
Bouttes, Nathaelle Swingedouw, Didier Roche, Didier M. Sanchez-goni, Maria F. Crosta, Xavier |
spellingShingle |
Bouttes, Nathaelle Swingedouw, Didier Roche, Didier M. Sanchez-goni, Maria F. Crosta, Xavier Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
author_facet |
Bouttes, Nathaelle Swingedouw, Didier Roche, Didier M. Sanchez-goni, Maria F. Crosta, Xavier |
author_sort |
Bouttes, Nathaelle |
title |
Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
title_short |
Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
title_full |
Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
title_fullStr |
Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
title_full_unstemmed |
Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
title_sort |
response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00497/60821/65114.pdf https://archimer.ifremer.fr/doc/00497/60821/65115.pdf https://archimer.ifremer.fr/doc/00497/60821/65116.zip https://doi.org/10.5194/cp-14-239-2018 https://archimer.ifremer.fr/doc/00497/60821/ |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2018-03 , Vol. 14 , N. 2 , P. 239-253 |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/656625/EU//CHOCOLATE https://archimer.ifremer.fr/doc/00497/60821/65114.pdf https://archimer.ifremer.fr/doc/00497/60821/65115.pdf https://archimer.ifremer.fr/doc/00497/60821/65116.zip doi:10.5194/cp-14-239-2018 https://archimer.ifremer.fr/doc/00497/60821/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/cp-14-239-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
2 |
container_start_page |
239 |
op_container_end_page |
253 |
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1766028077513572352 |