Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes
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 rath...
Published in: | Earth System Dynamics |
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Online Access: | https://doi.org/10.5194/esd-4-109-2013 https://esd.copernicus.org/articles/4/109/2013/ |
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ftcopernicus:oai:publications.copernicus.org:esd18052 2023-05-15T17:31:21+02:00 Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/esd-4-109-2013 https://esd.copernicus.org/articles/4/109/2013/ eng eng info:eu-repo/grantAgreement/EC/FP7/264879 doi:10.5194/esd-4-109-2013 https://esd.copernicus.org/articles/4/109/2013/ info:eu-repo/semantics/openAccess eISSN: 2190-4987 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/esd-4-109-2013 2020-07-20T16:25:31Z 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. Other/Unknown Material North Atlantic Southern Ocean Copernicus Publications: E-Journals Pacific Southern Ocean Earth System Dynamics 4 1 109 127 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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. |
format |
Other/Unknown Material |
author |
Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. |
spellingShingle |
Séférian, R. Bopp, L. Swingedouw, D. Servonnat, J. Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/esd-4-109-2013 https://esd.copernicus.org/articles/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 |
eISSN: 2190-4987 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/264879 doi:10.5194/esd-4-109-2013 https://esd.copernicus.org/articles/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 |
_version_ |
1766128874950754304 |