Oxygen isotope constraints on the ventilation of the modern and glacial Pacific
International audience Changes in Pacific tracer reservoirs and transports are thought to be central to the regulation of atmospheric CO 2 on glacial-interglacial timescales. However, there are currently two contrasting views of the circulation of the modern Pacific; the classical view sees southern...
Published in: | Climate Dynamics |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
|
Subjects: | |
Online Access: | https://hal.science/hal-04196743 https://hal.science/hal-04196743/document https://hal.science/hal-04196743/file/s00382-023-06910-8.pdf https://doi.org/10.1007/s00382-023-06910-8 |
id |
ftsorbonneuniv:oai:HAL:hal-04196743v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Pacific Ocean Ocean circulation Ventilation Oxygen isotopes Last Glacial Maximum [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
Pacific Ocean Ocean circulation Ventilation Oxygen isotopes Last Glacial Maximum [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Millet, Bruno Gray, William, R de Lavergne, Casimir Roche, Didier M. Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
topic_facet |
Pacific Ocean Ocean circulation Ventilation Oxygen isotopes Last Glacial Maximum [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Changes in Pacific tracer reservoirs and transports are thought to be central to the regulation of atmospheric CO 2 on glacial-interglacial timescales. However, there are currently two contrasting views of the circulation of the modern Pacific; the classical view sees southern sourced abyssal waters upwelling to about 1.5 km depth before flowing southward, whereas the bathymetrically constrained view sees the mid-depths (1-2.5 km) largely isolated from the global overturning circulation and predominantly ventilated by diffusion. Furthermore, changes in the circulation of the Pacific under differing climate states remain poorly understood. Through both a modern and a Last Glacial Maximum (LGM) analysis focusing on oxygen isotopes in seawater and benthic foraminifera as conservative tracers, we show that isopycnal diffusion strongly influences the mid-depths of the Pacific. Diapycnal diffusion is most prominent in the subarctic Pacific, where an important return path of abyssal tracers to the surface is identified in the modern state. At the LGM we infer an expansion of North Pacific Intermediate Water, as well as increased layering of the deeper North Pacific which would weaken the return path of abyssal tracers. These proposed changes imply a likely increase in ocean carbon storage within the deep Pacific during the LGM relative to the Holocene. |
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) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Nucleus for European Modeling of the Ocean (NEMO R&D ) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Modélisation du climat (CLIM) Vrije Universiteit Amsterdam Amsterdam (VU) LEFE programme through the ROOF project ANR-20-CE01-0017,CARBCOMP,Modulation du CO2 par la compensation des carbonates du dernier glaciaire aux océans du futur(2020) |
format |
Article in Journal/Newspaper |
author |
Millet, Bruno Gray, William, R de Lavergne, Casimir Roche, Didier M. |
author_facet |
Millet, Bruno Gray, William, R de Lavergne, Casimir Roche, Didier M. |
author_sort |
Millet, Bruno |
title |
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
title_short |
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
title_full |
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
title_fullStr |
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
title_full_unstemmed |
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific |
title_sort |
oxygen isotope constraints on the ventilation of the modern and glacial pacific |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04196743 https://hal.science/hal-04196743/document https://hal.science/hal-04196743/file/s00382-023-06910-8.pdf https://doi.org/10.1007/s00382-023-06910-8 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-04196743 Climate Dynamics, 2023, ⟨10.1007/s00382-023-06910-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-023-06910-8 hal-04196743 https://hal.science/hal-04196743 https://hal.science/hal-04196743/document https://hal.science/hal-04196743/file/s00382-023-06910-8.pdf doi:10.1007/s00382-023-06910-8 WOS: 001062569100001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00382-023-06910-8 |
container_title |
Climate Dynamics |
_version_ |
1812181690821378048 |
spelling |
ftsorbonneuniv:oai:HAL:hal-04196743v1 2024-10-06T13:53:03+00:00 Oxygen isotope constraints on the ventilation of the modern and glacial Pacific Millet, Bruno Gray, William, R de Lavergne, Casimir Roche, Didier M. 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) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Nucleus for European Modeling of the Ocean (NEMO R&D ) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Modélisation du climat (CLIM) Vrije Universiteit Amsterdam Amsterdam (VU) LEFE programme through the ROOF project ANR-20-CE01-0017,CARBCOMP,Modulation du CO2 par la compensation des carbonates du dernier glaciaire aux océans du futur(2020) 2023-08-31 https://hal.science/hal-04196743 https://hal.science/hal-04196743/document https://hal.science/hal-04196743/file/s00382-023-06910-8.pdf https://doi.org/10.1007/s00382-023-06910-8 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-023-06910-8 hal-04196743 https://hal.science/hal-04196743 https://hal.science/hal-04196743/document https://hal.science/hal-04196743/file/s00382-023-06910-8.pdf doi:10.1007/s00382-023-06910-8 WOS: 001062569100001 info:eu-repo/semantics/OpenAccess ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-04196743 Climate Dynamics, 2023, ⟨10.1007/s00382-023-06910-8⟩ Pacific Ocean Ocean circulation Ventilation Oxygen isotopes Last Glacial Maximum [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 2023 ftsorbonneuniv https://doi.org/10.1007/s00382-023-06910-8 2024-09-06T00:03:57Z International audience Changes in Pacific tracer reservoirs and transports are thought to be central to the regulation of atmospheric CO 2 on glacial-interglacial timescales. However, there are currently two contrasting views of the circulation of the modern Pacific; the classical view sees southern sourced abyssal waters upwelling to about 1.5 km depth before flowing southward, whereas the bathymetrically constrained view sees the mid-depths (1-2.5 km) largely isolated from the global overturning circulation and predominantly ventilated by diffusion. Furthermore, changes in the circulation of the Pacific under differing climate states remain poorly understood. Through both a modern and a Last Glacial Maximum (LGM) analysis focusing on oxygen isotopes in seawater and benthic foraminifera as conservative tracers, we show that isopycnal diffusion strongly influences the mid-depths of the Pacific. Diapycnal diffusion is most prominent in the subarctic Pacific, where an important return path of abyssal tracers to the surface is identified in the modern state. At the LGM we infer an expansion of North Pacific Intermediate Water, as well as increased layering of the deeper North Pacific which would weaken the return path of abyssal tracers. These proposed changes imply a likely increase in ocean carbon storage within the deep Pacific during the LGM relative to the Holocene. Article in Journal/Newspaper Subarctic HAL Sorbonne Université Pacific Climate Dynamics |