Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales
International audience Chaotic intrinsic variability (CIV) emerges spontaneously from nonlinear ocean dynamics even without any atmospheric variability. Eddy-permitting numerical simulations suggest that CIV is a significant contributor to the interannual to decadal variability of physical propertie...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615/document https://hal.archives-ouvertes.fr/hal-03000615/file/Gehlen2020.pdf https://doi.org/10.1029/2020GL088304 |
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ftccsdartic:oai:HAL:hal-03000615v1 2023-05-15T18:25:17+02:00 Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales Gehlen, M. Berthet, S. Séférian, R. Ethé, Ch., Penduff, Thierry Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2020-11-28 https://hal.archives-ouvertes.fr/hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615/document https://hal.archives-ouvertes.fr/hal-03000615/file/Gehlen2020.pdf https://doi.org/10.1029/2020GL088304 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL088304 hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615/document https://hal.archives-ouvertes.fr/hal-03000615/file/Gehlen2020.pdf doi:10.1029/2020GL088304 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03000615 Geophysical Research Letters, American Geophysical Union, 2020, 47 (22), ⟨10.1029/2020GL088304⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1029/2020GL088304 2021-11-07T00:37:45Z International audience Chaotic intrinsic variability (CIV) emerges spontaneously from nonlinear ocean dynamics even without any atmospheric variability. Eddy-permitting numerical simulations suggest that CIV is a significant contributor to the interannual to decadal variability of physical properties. Here we show from an ensemble of global ocean eddy-permitting simulations that large-scale interannual CIV propagates from physical properties to sea-air CO 2 fluxes in areas of high mesoscale eddy activity (e.g., Southern Ocean and western boundary currents). In these regions and at scales larger than 500 km (~5°), CIV contributes significantly to the interannual variability of sea-air CO 2 fluxes. Between 35°S and 45°S (midlatitude Southern Ocean), CIV amounts to 23.76 TgC yr −1 or one half of the atmospherically forced variability. Locally, its contribution to the total interannual variance of sea-air CO 2 fluxes exceeds 76%. Outside eddy-active regions its contribution to total interannual variability is below 16%. Plain Language Summary Sea-air CO 2 fluxes undergo substantial regional and interannual fluctuations. These fluctuations are mostly forced by changes in large-scale atmospheric patterns, but ocean internal dynamics could also contribute to them. This study quantifies these two sources of variability and their contributions to fluctuations of sea-air CO 2 fluxes over large oceanic regions. It relies on the analyses of three ocean numerical simulations driven by the same atmospheric forcing but starting from small differences in initial conditions, and including a simplified representation of marine ecosystems. Simulations are run at a horizontal resolution allowing to model part of the effect of ocean mesoscale activity on physical and chemical tracers. We demonstrate that nonlinear oceanic processes drive fluctuations of sea-air CO 2 fluxes at interannual timescales that are inherently random. The magnitude of these fluctuations is substantial over areas of high kinetic energy and locally exceeds ... Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Geophysical Research Letters 47 22 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Gehlen, M. Berthet, S. Séférian, R. Ethé, Ch., Penduff, Thierry Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Chaotic intrinsic variability (CIV) emerges spontaneously from nonlinear ocean dynamics even without any atmospheric variability. Eddy-permitting numerical simulations suggest that CIV is a significant contributor to the interannual to decadal variability of physical properties. Here we show from an ensemble of global ocean eddy-permitting simulations that large-scale interannual CIV propagates from physical properties to sea-air CO 2 fluxes in areas of high mesoscale eddy activity (e.g., Southern Ocean and western boundary currents). In these regions and at scales larger than 500 km (~5°), CIV contributes significantly to the interannual variability of sea-air CO 2 fluxes. Between 35°S and 45°S (midlatitude Southern Ocean), CIV amounts to 23.76 TgC yr −1 or one half of the atmospherically forced variability. Locally, its contribution to the total interannual variance of sea-air CO 2 fluxes exceeds 76%. Outside eddy-active regions its contribution to total interannual variability is below 16%. Plain Language Summary Sea-air CO 2 fluxes undergo substantial regional and interannual fluctuations. These fluctuations are mostly forced by changes in large-scale atmospheric patterns, but ocean internal dynamics could also contribute to them. This study quantifies these two sources of variability and their contributions to fluctuations of sea-air CO 2 fluxes over large oceanic regions. It relies on the analyses of three ocean numerical simulations driven by the same atmospheric forcing but starting from small differences in initial conditions, and including a simplified representation of marine ecosystems. Simulations are run at a horizontal resolution allowing to model part of the effect of ocean mesoscale activity on physical and chemical tracers. We demonstrate that nonlinear oceanic processes drive fluctuations of sea-air CO 2 fluxes at interannual timescales that are inherently random. The magnitude of these fluctuations is substantial over areas of high kinetic energy and locally exceeds ... |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Gehlen, M. Berthet, S. Séférian, R. Ethé, Ch., Penduff, Thierry |
author_facet |
Gehlen, M. Berthet, S. Séférian, R. Ethé, Ch., Penduff, Thierry |
author_sort |
Gehlen, M. |
title |
Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
title_short |
Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
title_full |
Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
title_fullStr |
Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
title_full_unstemmed |
Quantification of Chaotic Intrinsic Variability of Sea‐Air CO 2 Fluxes at Interannual Timescales |
title_sort |
quantification of chaotic intrinsic variability of sea‐air co 2 fluxes at interannual timescales |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615/document https://hal.archives-ouvertes.fr/hal-03000615/file/Gehlen2020.pdf https://doi.org/10.1029/2020GL088304 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03000615 Geophysical Research Letters, American Geophysical Union, 2020, 47 (22), ⟨10.1029/2020GL088304⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL088304 hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615 https://hal.archives-ouvertes.fr/hal-03000615/document https://hal.archives-ouvertes.fr/hal-03000615/file/Gehlen2020.pdf doi:10.1029/2020GL088304 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020GL088304 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
22 |
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1766206614903193600 |