Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study
International audience Atmospheric CO2 was ∼90 ppmv lower at the Last Glacial Maximum (LGM) compared to the late Holocene, but the mechanisms responsible for this change remain elusive. Here we employ a carbon isotope‐enabled Earth System Model to investigate the role of ocean circulation in setting...
Published in: | Paleoceanography |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756/document https://hal.archives-ouvertes.fr/hal-03226756/file/Menviel_et_al-2017-Paleoceanography.pdf https://doi.org/10.1002/2016PA003024 |
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ftunivnantes:oai:HAL:hal-03226756v1 2023-05-15T13:56:36+02:00 Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study Menviel, L. Yu, J. Joos, F. Mouchet, A. Meissner, K. England, M. University of New South Wales Sydney (UNSW) Australian National University (ANU) Oeschger Centre for Climate Change Research (OCCR) University of Bern Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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-Saclay-Centre National de la Recherche Scientifique (CNRS) 2017 https://hal.archives-ouvertes.fr/hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756/document https://hal.archives-ouvertes.fr/hal-03226756/file/Menviel_et_al-2017-Paleoceanography.pdf https://doi.org/10.1002/2016PA003024 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2016PA003024 hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756/document https://hal.archives-ouvertes.fr/hal-03226756/file/Menviel_et_al-2017-Paleoceanography.pdf doi:10.1002/2016PA003024 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-03226756 Paleoceanography, American Geophysical Union, 2017, 32 (1), pp.2-17. ⟨10.1002/2016PA003024⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2017 ftunivnantes https://doi.org/10.1002/2016PA003024 2022-10-18T23:32:08Z International audience Atmospheric CO2 was ∼90 ppmv lower at the Last Glacial Maximum (LGM) compared to the late Holocene, but the mechanisms responsible for this change remain elusive. Here we employ a carbon isotope‐enabled Earth System Model to investigate the role of ocean circulation in setting the LGM oceanic δ13C distribution, thereby improving our understanding of glacial/interglacial atmospheric CO2 variations. We find that the mean ocean δ13C change can be explained by a 378 ± 88 Gt C(2σ) smaller LGM terrestrial carbon reservoir compared to the Holocene. Critically, in this model, differences in the oceanic δ13C spatial pattern can only be reconciled with a LGM ocean circulation state characterized by a weak (10–15 Sv) and relatively shallow (2000–2500 m) North Atlantic Deep Water cell, reduced Antarctic Bottom Water transport (≤10 Sv globally integrated), and relatively weak (6–8 Sv) and shallow (1000–1500 m) North Pacific Intermediate Water formation. This oceanic circulation state is corroborated by results from the isotope‐enabled Bern3D ocean model and further confirmed by high LGM ventilation ages in the deep ocean, particularly in the deep South Atlantic and South Pacific. This suggests a poorly ventilated glacial deep ocean which would have facilitated the sequestration of carbon lost from the terrestrial biosphere and atmosphere. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Université de Nantes: HAL-UNIV-NANTES Antarctic Pacific Paleoceanography 32 1 2 17 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Menviel, L. Yu, J. Joos, F. Mouchet, A. Meissner, K. England, M. Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Atmospheric CO2 was ∼90 ppmv lower at the Last Glacial Maximum (LGM) compared to the late Holocene, but the mechanisms responsible for this change remain elusive. Here we employ a carbon isotope‐enabled Earth System Model to investigate the role of ocean circulation in setting the LGM oceanic δ13C distribution, thereby improving our understanding of glacial/interglacial atmospheric CO2 variations. We find that the mean ocean δ13C change can be explained by a 378 ± 88 Gt C(2σ) smaller LGM terrestrial carbon reservoir compared to the Holocene. Critically, in this model, differences in the oceanic δ13C spatial pattern can only be reconciled with a LGM ocean circulation state characterized by a weak (10–15 Sv) and relatively shallow (2000–2500 m) North Atlantic Deep Water cell, reduced Antarctic Bottom Water transport (≤10 Sv globally integrated), and relatively weak (6–8 Sv) and shallow (1000–1500 m) North Pacific Intermediate Water formation. This oceanic circulation state is corroborated by results from the isotope‐enabled Bern3D ocean model and further confirmed by high LGM ventilation ages in the deep ocean, particularly in the deep South Atlantic and South Pacific. This suggests a poorly ventilated glacial deep ocean which would have facilitated the sequestration of carbon lost from the terrestrial biosphere and atmosphere. |
author2 |
University of New South Wales Sydney (UNSW) Australian National University (ANU) Oeschger Centre for Climate Change Research (OCCR) University of Bern Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Menviel, L. Yu, J. Joos, F. Mouchet, A. Meissner, K. England, M. |
author_facet |
Menviel, L. Yu, J. Joos, F. Mouchet, A. Meissner, K. England, M. |
author_sort |
Menviel, L. |
title |
Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
title_short |
Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
title_full |
Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
title_fullStr |
Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
title_full_unstemmed |
Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study |
title_sort |
poorly ventilated deep ocean at the last glacial maximum inferred from carbon isotopes: a data-model comparison study |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756/document https://hal.archives-ouvertes.fr/hal-03226756/file/Menviel_et_al-2017-Paleoceanography.pdf https://doi.org/10.1002/2016PA003024 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-03226756 Paleoceanography, American Geophysical Union, 2017, 32 (1), pp.2-17. ⟨10.1002/2016PA003024⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016PA003024 hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756 https://hal.archives-ouvertes.fr/hal-03226756/document https://hal.archives-ouvertes.fr/hal-03226756/file/Menviel_et_al-2017-Paleoceanography.pdf doi:10.1002/2016PA003024 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016PA003024 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
1 |
container_start_page |
2 |
op_container_end_page |
17 |
_version_ |
1766264138904895488 |