Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes
International audience Abstract. Several recent observation-based studies suggest that ocean anthropogenic carbon uptake has slowed down due to the impact of anthropogenic forced climate change. However, it remains unclear whether detected changes over the recent time period can be attributed to ant...
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ftceafr:oai:HAL:hal-03209966v1 2024-06-09T07:48:09+00:00 Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2013 https://hal.science/hal-03209966 https://hal.science/hal-03209966/document https://hal.science/hal-03209966/file/esd-4-109-2013.pdf https://doi.org/10.5194/esd-4-109-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/esd-4-109-2013 hal-03209966 https://hal.science/hal-03209966 https://hal.science/hal-03209966/document https://hal.science/hal-03209966/file/esd-4-109-2013.pdf doi:10.5194/esd-4-109-2013 info:eu-repo/semantics/OpenAccess ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics https://hal.science/hal-03209966 Earth System Dynamics, 2013, 4 (1), pp.109-127. ⟨10.5194/esd-4-109-2013⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2013 ftceafr https://doi.org/10.5194/esd-4-109-2013 2024-05-16T14:30:04Z International audience Abstract. Several recent observation-based studies suggest that ocean anthropogenic carbon uptake has slowed down due to the impact of anthropogenic forced climate change. However, it remains unclear whether detected changes over the recent time period can be attributed to anthropogenic climate change or rather to natural climate variability (internal plus naturally forced variability) alone. One large uncertainty arises from the lack of knowledge on ocean carbon flux natural variability at the decadal time scales. To gain more insights into decadal time scales, we have examined the internal variability of ocean carbon fluxes in a 1000 yr long preindustrial simulation performed with the Earth System Model IPSL-CM5A-LR. Our analysis shows that ocean carbon fluxes exhibit low-frequency oscillations that emerge from their year-to-year variability in the North Atlantic, the North Pacific, and the Southern Ocean. In our model, a 20 yr mode of variability in the North Atlantic air-sea carbon flux is driven by sea surface temperature variability and accounts for ~40% of the interannual regional variance. The North Pacific and the Southern Ocean carbon fluxes are also characterised by decadal to multi-decadal modes of variability (10 to 50 yr) that account for 20–40% of the interannual regional variance. These modes are driven by the vertical supply of dissolved inorganic carbon through the variability of Ekman-induced upwelling and deep-mixing events. Differences in drivers of regional modes of variability stem from the coupling between ocean dynamics variability and the ocean carbon distribution, which is set by large-scale secular ocean circulation. Article in Journal/Newspaper North Atlantic Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Pacific Southern Ocean Earth System Dynamics 4 1 109 127 |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract. Several recent observation-based studies suggest that ocean anthropogenic carbon uptake has slowed down due to the impact of anthropogenic forced climate change. However, it remains unclear whether detected changes over the recent time period can be attributed to anthropogenic climate change or rather to natural climate variability (internal plus naturally forced variability) alone. One large uncertainty arises from the lack of knowledge on ocean carbon flux natural variability at the decadal time scales. To gain more insights into decadal time scales, we have examined the internal variability of ocean carbon fluxes in a 1000 yr long preindustrial simulation performed with the Earth System Model IPSL-CM5A-LR. Our analysis shows that ocean carbon fluxes exhibit low-frequency oscillations that emerge from their year-to-year variability in the North Atlantic, the North Pacific, and the Southern Ocean. In our model, a 20 yr mode of variability in the North Atlantic air-sea carbon flux is driven by sea surface temperature variability and accounts for ~40% of the interannual regional variance. The North Pacific and the Southern Ocean carbon fluxes are also characterised by decadal to multi-decadal modes of variability (10 to 50 yr) that account for 20–40% of the interannual regional variance. These modes are driven by the vertical supply of dissolved inorganic carbon through the variability of Ekman-induced upwelling and deep-mixing events. Differences in drivers of regional modes of variability stem from the coupling between ocean dynamics variability and the ocean carbon distribution, which is set by large-scale secular ocean circulation. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Article in Journal/Newspaper |
author |
Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. |
author_facet |
Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. |
author_sort |
Séférian, R. |
title |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
title_short |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
title_full |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
title_fullStr |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
title_full_unstemmed |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
title_sort |
dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-03209966 https://hal.science/hal-03209966/document https://hal.science/hal-03209966/file/esd-4-109-2013.pdf https://doi.org/10.5194/esd-4-109-2013 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics https://hal.science/hal-03209966 Earth System Dynamics, 2013, 4 (1), pp.109-127. ⟨10.5194/esd-4-109-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/esd-4-109-2013 hal-03209966 https://hal.science/hal-03209966 https://hal.science/hal-03209966/document https://hal.science/hal-03209966/file/esd-4-109-2013.pdf doi:10.5194/esd-4-109-2013 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/esd-4-109-2013 |
container_title |
Earth System Dynamics |
container_volume |
4 |
container_issue |
1 |
container_start_page |
109 |
op_container_end_page |
127 |
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1801379742165762048 |