Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes
PAR00002831 International audience The magnitude of the interannual variability of North Atlantic air-sea CO 2 fluxes remains uncertain. Fluxes inferred from atmospheric inversions have large variability, whereas those simulated by ocean models have small variability. Part of the difference is that...
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ftccsdartic:oai:HAL:hal-00331127v1 2023-05-15T17:28:11+02:00 Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes Raynaud, Stéphane Aumont, Olivier Rodgers, Keith B. Yiou, Pascal Orr, James C. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2005-08-30 https://hal.archives-ouvertes.fr/hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127/document https://hal.archives-ouvertes.fr/hal-00331127/file/osd-2-437-2005.pdf https://doi.org/10.5194/os-2-43-2006 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2-43-2006 hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127/document https://hal.archives-ouvertes.fr/hal-00331127/file/osd-2-437-2005.pdf doi:10.5194/os-2-43-2006 IRD: PAR00002831 info:eu-repo/semantics/OpenAccess ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.archives-ouvertes.fr/hal-00331127 Ocean Science Discussions, European Geosciences Union, 2005, 2 (4), pp.437-472. ⟨10.5194/os-2-43-2006⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.5194/os-2-43-2006 2021-12-19T04:09:04Z PAR00002831 International audience The magnitude of the interannual variability of North Atlantic air-sea CO 2 fluxes remains uncertain. Fluxes inferred from atmospheric inversions have large variability, whereas those simulated by ocean models have small variability. Part of the difference is that unlike typical atmospheric inversions, ocean models come with spatial resolution at the sub-basin scale. Here we explore sub-basin-scale spatiotemporal variability in the North Atlantic in one ocean model in order to better understand why the the North Atlantic basin may well contribute very little to the global variability of air-sea CO 2 flux. We made two simulations with a biogeochemical model coupled to a global ocean general circulation model (OGCM), which itself was forced by 55-year NCEP reanalysis fields. In the first simulation, atmospheric CO 2 was maintained at the preindustrial level (278 ppmv); in the second simulation, atmospheric CO 2 followed the observed increase. Simulated air-sea CO 2 fluxes and associated variables were analysed with a statistical tool known as multichannel singular spectrum analysis (MSSA). We found that the subtropical gyre is not the largest contributor to the overall, basin-wide variability, in contrast to previous suggestions. The subpolar gyre and the inter-gyre region (the transition area between subpolar and subtropical gyres) also contribute with multipolar anomalies at multiple frequencies: these tend to cancel one another in terms of the basin-wide air-sea CO 2 flux. We found a strong correlation between the air-sea CO 2 fluxes and the North Atlantic Oscillation (NAO), but only if one takes into account time lags as does MSSA (maximum r =0.64 for lags between 1 and 3 years). The contribution of anthropogenic CO 2 to total variability was negligible at interannual time scales, whereas at the decadal (13-year) time scale, it increased variability by 30%. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Ocean Science 2 1 43 60 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Raynaud, Stéphane Aumont, Olivier Rodgers, Keith B. Yiou, Pascal Orr, James C. Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
PAR00002831 International audience The magnitude of the interannual variability of North Atlantic air-sea CO 2 fluxes remains uncertain. Fluxes inferred from atmospheric inversions have large variability, whereas those simulated by ocean models have small variability. Part of the difference is that unlike typical atmospheric inversions, ocean models come with spatial resolution at the sub-basin scale. Here we explore sub-basin-scale spatiotemporal variability in the North Atlantic in one ocean model in order to better understand why the the North Atlantic basin may well contribute very little to the global variability of air-sea CO 2 flux. We made two simulations with a biogeochemical model coupled to a global ocean general circulation model (OGCM), which itself was forced by 55-year NCEP reanalysis fields. In the first simulation, atmospheric CO 2 was maintained at the preindustrial level (278 ppmv); in the second simulation, atmospheric CO 2 followed the observed increase. Simulated air-sea CO 2 fluxes and associated variables were analysed with a statistical tool known as multichannel singular spectrum analysis (MSSA). We found that the subtropical gyre is not the largest contributor to the overall, basin-wide variability, in contrast to previous suggestions. The subpolar gyre and the inter-gyre region (the transition area between subpolar and subtropical gyres) also contribute with multipolar anomalies at multiple frequencies: these tend to cancel one another in terms of the basin-wide air-sea CO 2 flux. We found a strong correlation between the air-sea CO 2 fluxes and the North Atlantic Oscillation (NAO), but only if one takes into account time lags as does MSSA (maximum r =0.64 for lags between 1 and 3 years). The contribution of anthropogenic CO 2 to total variability was negligible at interannual time scales, whereas at the decadal (13-year) time scale, it increased variability by 30%. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Raynaud, Stéphane Aumont, Olivier Rodgers, Keith B. Yiou, Pascal Orr, James C. |
author_facet |
Raynaud, Stéphane Aumont, Olivier Rodgers, Keith B. Yiou, Pascal Orr, James C. |
author_sort |
Raynaud, Stéphane |
title |
Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
title_short |
Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
title_full |
Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
title_fullStr |
Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
title_full_unstemmed |
Interannual-to-decadal variability of North Atlantic air-sea CO 2 fluxes |
title_sort |
interannual-to-decadal variability of north atlantic air-sea co 2 fluxes |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127/document https://hal.archives-ouvertes.fr/hal-00331127/file/osd-2-437-2005.pdf https://doi.org/10.5194/os-2-43-2006 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.archives-ouvertes.fr/hal-00331127 Ocean Science Discussions, European Geosciences Union, 2005, 2 (4), pp.437-472. ⟨10.5194/os-2-43-2006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2-43-2006 hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127 https://hal.archives-ouvertes.fr/hal-00331127/document https://hal.archives-ouvertes.fr/hal-00331127/file/osd-2-437-2005.pdf doi:10.5194/os-2-43-2006 IRD: PAR00002831 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-2-43-2006 |
container_title |
Ocean Science |
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2 |
container_issue |
1 |
container_start_page |
43 |
op_container_end_page |
60 |
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