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...
Published in: | Ocean Science |
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Main Authors: | , , , , |
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Format: | Report |
Language: | English |
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HAL CCSD
2008
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Online Access: | https://hal.science/hal-00331127 https://hal.science/hal-00331127/document https://hal.science/hal-00331127/file/osd-2-437-2005.pdf https://doi.org/10.5194/os-2-43-2006 |
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Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
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) 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) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Report |
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 |
2008 |
url |
https://hal.science/hal-00331127 https://hal.science/hal-00331127/document https://hal.science/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 |
https://hal.science/hal-00331127 2008 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2-43-2006 hal-00331127 https://hal.science/hal-00331127 https://hal.science/hal-00331127/document https://hal.science/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 |
container_volume |
2 |
container_issue |
1 |
container_start_page |
43 |
op_container_end_page |
60 |
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1799484491288281088 |
spelling |
ftuniversailles:oai:HAL:hal-00331127v1 2024-05-19T07:44:39+00:00 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) 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) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2008-06-18 https://hal.science/hal-00331127 https://hal.science/hal-00331127/document https://hal.science/hal-00331127/file/osd-2-437-2005.pdf https://doi.org/10.5194/os-2-43-2006 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2-43-2006 hal-00331127 https://hal.science/hal-00331127 https://hal.science/hal-00331127/document https://hal.science/hal-00331127/file/osd-2-437-2005.pdf doi:10.5194/os-2-43-2006 IRD: PAR00002831 info:eu-repo/semantics/OpenAccess https://hal.science/hal-00331127 2008 [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/preprint Preprints, Working Papers, . 2008 ftuniversailles https://doi.org/10.5194/os-2-43-2006 2024-04-25T00:26:17Z 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%. Report North Atlantic North Atlantic oscillation Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Ocean Science 2 1 43 60 |