Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2
International audience Estimates of the ocean's large-scale transport of anthropogenic CO 2 are based on one-time hydrographic sections, but the temporal variability of this transport has not been investigated. The aim of this study is to evaluate how the seasonal and mesoscale variability affe...
Published in: | Biogeosciences |
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ftccsdartic:oai:HAL:hal-03096727v1 2023-05-15T17:35:23+02:00 Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 Lachkar, Z. Orr, J. Dutay, J.-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) Modélisation du climat (CLIM) 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)-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) 2009 https://hal.archives-ouvertes.fr/hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727/document https://hal.archives-ouvertes.fr/hal-03096727/file/bg-6-2509-2009.pdf https://doi.org/10.5194/bg-6-2509-2009 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-2509-2009 hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727/document https://hal.archives-ouvertes.fr/hal-03096727/file/bg-6-2509-2009.pdf doi:10.5194/bg-6-2509-2009 info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-03096727 Biogeosciences, European Geosciences Union, 2009, 6 (11), pp.2509-2523. ⟨10.5194/bg-6-2509-2009⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.5194/bg-6-2509-2009 2021-12-19T00:35:49Z International audience Estimates of the ocean's large-scale transport of anthropogenic CO 2 are based on one-time hydrographic sections, but the temporal variability of this transport has not been investigated. The aim of this study is to evaluate how the seasonal and mesoscale variability affect data-based estimates of anthropogenic CO 2 transport. To diagnose this variability, we made a global anthropogenic CO 2 simulation using an eddy-permitting version of the coupled ocean seaice model ORCA-LIM. As for heat transport, the seasonally varying transport of anthropogenic CO 2 is largest within 20 • of the equator and shows secondary maxima in the subtropics. Ekman transport generally drives most of the seasonal variability, but the contribution of the vertical shear becomes important near the equator and in the Southern Ocean. Mesoscale variabilty contributes to the annual-mean transport of both heat and anthropogenic CO 2 with strong poleward transport in the Southern Ocean and equatorward transport in the tropics. This "rectified" eddy transport is largely baroclinic in the tropics and barotropic in the Southern Ocean due to a larger contribution from standing eddies. Our analysis revealed that most previous hydrographic estimates of meridional transport of anthropogenic CO 2 are severely biased because they neglect temporal fluctuations due to non-Ekman velocity variations. In each of the three major ocean basins, this bias is largest near the equator and in the high southern latitudes. In the subtropical North Atlantic, where most of the hydrographic-based estimates have been focused, this uncertainty represents up to 20% and 30% of total merid Article in Journal/Newspaper North Atlantic Orca Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Biogeosciences 6 11 2509 2523 |
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Open Polar |
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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 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Lachkar, Z. Orr, J. Dutay, J.-C. Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Estimates of the ocean's large-scale transport of anthropogenic CO 2 are based on one-time hydrographic sections, but the temporal variability of this transport has not been investigated. The aim of this study is to evaluate how the seasonal and mesoscale variability affect data-based estimates of anthropogenic CO 2 transport. To diagnose this variability, we made a global anthropogenic CO 2 simulation using an eddy-permitting version of the coupled ocean seaice model ORCA-LIM. As for heat transport, the seasonally varying transport of anthropogenic CO 2 is largest within 20 • of the equator and shows secondary maxima in the subtropics. Ekman transport generally drives most of the seasonal variability, but the contribution of the vertical shear becomes important near the equator and in the Southern Ocean. Mesoscale variabilty contributes to the annual-mean transport of both heat and anthropogenic CO 2 with strong poleward transport in the Southern Ocean and equatorward transport in the tropics. This "rectified" eddy transport is largely baroclinic in the tropics and barotropic in the Southern Ocean due to a larger contribution from standing eddies. Our analysis revealed that most previous hydrographic estimates of meridional transport of anthropogenic CO 2 are severely biased because they neglect temporal fluctuations due to non-Ekman velocity variations. In each of the three major ocean basins, this bias is largest near the equator and in the high southern latitudes. In the subtropical North Atlantic, where most of the hydrographic-based estimates have been focused, this uncertainty represents up to 20% and 30% of total merid |
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) Modélisation du climat (CLIM) 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)-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) |
format |
Article in Journal/Newspaper |
author |
Lachkar, Z. Orr, J. Dutay, J.-C. |
author_facet |
Lachkar, Z. Orr, J. Dutay, J.-C. |
author_sort |
Lachkar, Z. |
title |
Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
title_short |
Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
title_full |
Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
title_fullStr |
Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
title_full_unstemmed |
Seasonal and mesoscale variability of oceanic transport of anthropogenic CO2 |
title_sort |
seasonal and mesoscale variability of oceanic transport of anthropogenic co2 |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727/document https://hal.archives-ouvertes.fr/hal-03096727/file/bg-6-2509-2009.pdf https://doi.org/10.5194/bg-6-2509-2009 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Orca Southern Ocean |
genre_facet |
North Atlantic Orca Southern Ocean |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-03096727 Biogeosciences, European Geosciences Union, 2009, 6 (11), pp.2509-2523. ⟨10.5194/bg-6-2509-2009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-2509-2009 hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727 https://hal.archives-ouvertes.fr/hal-03096727/document https://hal.archives-ouvertes.fr/hal-03096727/file/bg-6-2509-2009.pdf doi:10.5194/bg-6-2509-2009 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-6-2509-2009 |
container_title |
Biogeosciences |
container_volume |
6 |
container_issue |
11 |
container_start_page |
2509 |
op_container_end_page |
2523 |
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