Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes
The Southern Ocean plays a major role in both the global oceanic uptake of anthropogenic CO2 and its interannual variations. The size and origin of the interannual variability in the Southern Ocean CO2 fluxes is debated. Observation-based estimates suggest a large variability (+/- 0.11 PgC/yr) while...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:85515 2024-04-21T08:12:10+00:00 Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes Mayot, Nicolas Quéré, Corinne Le Manning, Andrew Willis, David Gruber, Nicolas Schwinger, Jörg Séférian, Roland Ilyina, Tatiana Hauck, Judith Resplandy, Laure Bopp, Laurent Keeling, Ralph Rödenbeck, Christian 2022-03-28 https://ueaeprints.uea.ac.uk/id/eprint/85515/ https://doi.org/10.5194/egusphere-egu22-12773 unknown Mayot, Nicolas, Quéré, Corinne Le, Manning, Andrew, Willis, David, Gruber, Nicolas, Schwinger, Jörg, Séférian, Roland, Ilyina, Tatiana, Hauck, Judith, Resplandy, Laure, Bopp, Laurent, Keeling, Ralph and Rödenbeck, Christian (2022) Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes. In: EGU General Assembly 2022, 2022-05-23 - 2022-05-27. doi:10.5194/egusphere-egu22-12773 Conference or Workshop Item PeerReviewed 2022 ftuniveastangl https://doi.org/10.5194/egusphere-egu22-12773 2024-03-27T17:54:51Z The Southern Ocean plays a major role in both the global oceanic uptake of anthropogenic CO2 and its interannual variations. The size and origin of the interannual variability in the Southern Ocean CO2 fluxes is debated. Observation-based estimates suggest a large variability (+/- 0.11 PgC/yr) while Global Ocean Biogeochemistry Models (GOBMs) simulate almost no variability. Studying the air-sea fluxes of O2 can provide independent information that help resolve this data-model inconsistency. Oceanic O2 is influenced by the same physical and biogeochemical processes as CO2, but unlike CO2, its variability is not masked by a large anthropogenic flux. Here, we used 26 years (1994-2019) of monthly O2 fluxes from 9 GOBMs. These model outputs were compared to air-sea O2 fluxes inferred from an atmospheric inversion of precisely quantified changes in atmospheric O2 and CO2 levels. The 26-year time series of air-sea O2 fluxes from all GOBMs and the atmospheric inversion exhibited similar temporal variations. This could be linked to the Southern Annular Mode and its influence on air-sea heat flux forcing that induced large-scale changes in observed wintertime Mixed Layer Depth (MLD). However, the amplitude of the interannual variability in air-sea O2 fluxes was two times higher in the atmospheric inversion than in GOBMs. It possible that this was induced by the general overestimation of the mean wintertime MLD by the GOBM and subsurface vertical gradients in oxygen saturation lower than observed. Implications of these results for the variability in air-sea fluxes of CO2 will be discussed. Conference Object Southern Ocean University of East Anglia: UEA Digital Repository |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
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description |
The Southern Ocean plays a major role in both the global oceanic uptake of anthropogenic CO2 and its interannual variations. The size and origin of the interannual variability in the Southern Ocean CO2 fluxes is debated. Observation-based estimates suggest a large variability (+/- 0.11 PgC/yr) while Global Ocean Biogeochemistry Models (GOBMs) simulate almost no variability. Studying the air-sea fluxes of O2 can provide independent information that help resolve this data-model inconsistency. Oceanic O2 is influenced by the same physical and biogeochemical processes as CO2, but unlike CO2, its variability is not masked by a large anthropogenic flux. Here, we used 26 years (1994-2019) of monthly O2 fluxes from 9 GOBMs. These model outputs were compared to air-sea O2 fluxes inferred from an atmospheric inversion of precisely quantified changes in atmospheric O2 and CO2 levels. The 26-year time series of air-sea O2 fluxes from all GOBMs and the atmospheric inversion exhibited similar temporal variations. This could be linked to the Southern Annular Mode and its influence on air-sea heat flux forcing that induced large-scale changes in observed wintertime Mixed Layer Depth (MLD). However, the amplitude of the interannual variability in air-sea O2 fluxes was two times higher in the atmospheric inversion than in GOBMs. It possible that this was induced by the general overestimation of the mean wintertime MLD by the GOBM and subsurface vertical gradients in oxygen saturation lower than observed. Implications of these results for the variability in air-sea fluxes of CO2 will be discussed. |
format |
Conference Object |
author |
Mayot, Nicolas Quéré, Corinne Le Manning, Andrew Willis, David Gruber, Nicolas Schwinger, Jörg Séférian, Roland Ilyina, Tatiana Hauck, Judith Resplandy, Laure Bopp, Laurent Keeling, Ralph Rödenbeck, Christian |
spellingShingle |
Mayot, Nicolas Quéré, Corinne Le Manning, Andrew Willis, David Gruber, Nicolas Schwinger, Jörg Séférian, Roland Ilyina, Tatiana Hauck, Judith Resplandy, Laure Bopp, Laurent Keeling, Ralph Rödenbeck, Christian Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
author_facet |
Mayot, Nicolas Quéré, Corinne Le Manning, Andrew Willis, David Gruber, Nicolas Schwinger, Jörg Séférian, Roland Ilyina, Tatiana Hauck, Judith Resplandy, Laure Bopp, Laurent Keeling, Ralph Rödenbeck, Christian |
author_sort |
Mayot, Nicolas |
title |
Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
title_short |
Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
title_full |
Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
title_fullStr |
Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
title_full_unstemmed |
Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes |
title_sort |
origin and magnitude of interannual variabilities in southern ocean air-sea o2 and co2 fluxes |
publishDate |
2022 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/85515/ https://doi.org/10.5194/egusphere-egu22-12773 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Mayot, Nicolas, Quéré, Corinne Le, Manning, Andrew, Willis, David, Gruber, Nicolas, Schwinger, Jörg, Séférian, Roland, Ilyina, Tatiana, Hauck, Judith, Resplandy, Laure, Bopp, Laurent, Keeling, Ralph and Rödenbeck, Christian (2022) Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes. In: EGU General Assembly 2022, 2022-05-23 - 2022-05-27. doi:10.5194/egusphere-egu22-12773 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-12773 |
_version_ |
1796932137637642240 |