Ventilation of the abyss in the Atlantic sector of the Southern Ocean
International audience The Atlantic sector of the Southern Ocean is the world's main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older watermasses-ultimately replenishing the abyssal global ocean. In recent decade...
Published in: | Scientific Reports |
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Main Authors: | , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511/document https://hal.sorbonne-universite.fr/hal-03182511/file/s41598-021-86043-2.pdf https://doi.org/10.1038/s41598-021-86043-2 |
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ftunivnantes:oai:HAL:hal-03182511v1 |
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openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
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 Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Meredith, Michael P. Reverdin, Gilles Jullion, Loïc Aloisi, Giovanni Benetti, Marion Leng, Melanie J. Arrowsmith, Carol Haumann, F. Alexander Naveira Garabato, Alberto C. Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The Atlantic sector of the Southern Ocean is the world's main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older watermasses-ultimately replenishing the abyssal global ocean. In recent decades, numerous attempts at estimating the rates of ventilation and overturning of Antarctic Bottom Water in this region have led to a strikingly broad range of results, with water transport-based calculations (8.4-9.7 Sv) yielding larger rates than tracer-based estimates (3.7-4.9 Sv). Here, we reconcile these conflicting views by integrating transport-and tracer-based estimates within a common analytical framework, in which bottom water formation processes are explicitly quantified. We show that the layer of Antarctic Bottom Water denser than 28.36 kg m −3 γ n is exported northward at a rate of 8.4 ± 0.7 Sv, composed of 4.5 ± 0.3 Sv of well-ventilated Dense Shelf Water, and 3.9 ± 0.5 Sv of old Circumpolar Deep Water entrained into cascading plumes. The majority, but not all, of the Dense Shelf Water (3.4 ± 0.6 Sv) is generated on the continental shelves of the Weddell Sea. Only 55% of AABW exported from the region is well ventilated and thus draws down heat and carbon into the deep ocean. Our findings unify traditionally contrasting views of Antarctic Bottom Water production in the Atlantic sector, and define a baseline, process-discerning target for its realistic representation in climate models. |
author2 |
Processus et interactions de fine échelle océanique (PROTEO) 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)-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)-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)) 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)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) University of Southampton Institut de Physique du Globe de Paris (IPG Paris) Institute of Earth Sciences Reykjavik University of Iceland Reykjavik British Geological Survey (BGS) Princeton University National Oceanographic Centre Southampton (NOCS) European Project: 637770,H2020,ERC-2014-STG,WAPITI(2015) |
format |
Article in Journal/Newspaper |
author |
Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Meredith, Michael P. Reverdin, Gilles Jullion, Loïc Aloisi, Giovanni Benetti, Marion Leng, Melanie J. Arrowsmith, Carol Haumann, F. Alexander Naveira Garabato, Alberto C. |
author_facet |
Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Meredith, Michael P. Reverdin, Gilles Jullion, Loïc Aloisi, Giovanni Benetti, Marion Leng, Melanie J. Arrowsmith, Carol Haumann, F. Alexander Naveira Garabato, Alberto C. |
author_sort |
Akhoudas, Camille Hayatte |
title |
Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
title_short |
Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
title_full |
Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
title_fullStr |
Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Ventilation of the abyss in the Atlantic sector of the Southern Ocean |
title_sort |
ventilation of the abyss in the atlantic sector of the southern ocean |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511/document https://hal.sorbonne-universite.fr/hal-03182511/file/s41598-021-86043-2.pdf https://doi.org/10.1038/s41598-021-86043-2 |
geographic |
Antarctic Southern Ocean Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Weddell |
genre |
Antarc* Antarctic Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Southern Ocean Weddell Sea |
op_source |
ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.sorbonne-universite.fr/hal-03182511 Scientific Reports, 2021, 11 (1), ⟨10.1038/s41598-021-86043-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-021-86043-2 info:eu-repo/semantics/altIdentifier/pmid/33762612 info:eu-repo/grantAgreement//637770/EU/Water-mass transformation and Pathways In The Weddell Sea: uncovering the dynamics of a global climate chokepoint from In-situ measurements/WAPITI hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511/document https://hal.sorbonne-universite.fr/hal-03182511/file/s41598-021-86043-2.pdf doi:10.1038/s41598-021-86043-2 PUBMED: 33762612 WOS: 000634972100010 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41598-021-86043-2 |
container_title |
Scientific Reports |
container_volume |
11 |
container_issue |
1 |
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1766255752598519808 |
spelling |
ftunivnantes:oai:HAL:hal-03182511v1 2023-05-15T13:51:43+02:00 Ventilation of the abyss in the Atlantic sector of the Southern Ocean Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Meredith, Michael P. Reverdin, Gilles Jullion, Loïc Aloisi, Giovanni Benetti, Marion Leng, Melanie J. Arrowsmith, Carol Haumann, F. Alexander Naveira Garabato, Alberto C. Processus et interactions de fine échelle océanique (PROTEO) 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)-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)-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)) 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)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) University of Southampton Institut de Physique du Globe de Paris (IPG Paris) Institute of Earth Sciences Reykjavik University of Iceland Reykjavik British Geological Survey (BGS) Princeton University National Oceanographic Centre Southampton (NOCS) European Project: 637770,H2020,ERC-2014-STG,WAPITI(2015) 2021-03-24 https://hal.sorbonne-universite.fr/hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511/document https://hal.sorbonne-universite.fr/hal-03182511/file/s41598-021-86043-2.pdf https://doi.org/10.1038/s41598-021-86043-2 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-021-86043-2 info:eu-repo/semantics/altIdentifier/pmid/33762612 info:eu-repo/grantAgreement//637770/EU/Water-mass transformation and Pathways In The Weddell Sea: uncovering the dynamics of a global climate chokepoint from In-situ measurements/WAPITI hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511 https://hal.sorbonne-universite.fr/hal-03182511/document https://hal.sorbonne-universite.fr/hal-03182511/file/s41598-021-86043-2.pdf doi:10.1038/s41598-021-86043-2 PUBMED: 33762612 WOS: 000634972100010 info:eu-repo/semantics/OpenAccess ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.sorbonne-universite.fr/hal-03182511 Scientific Reports, 2021, 11 (1), ⟨10.1038/s41598-021-86043-2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1038/s41598-021-86043-2 2023-02-08T04:43:09Z International audience The Atlantic sector of the Southern Ocean is the world's main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older watermasses-ultimately replenishing the abyssal global ocean. In recent decades, numerous attempts at estimating the rates of ventilation and overturning of Antarctic Bottom Water in this region have led to a strikingly broad range of results, with water transport-based calculations (8.4-9.7 Sv) yielding larger rates than tracer-based estimates (3.7-4.9 Sv). Here, we reconcile these conflicting views by integrating transport-and tracer-based estimates within a common analytical framework, in which bottom water formation processes are explicitly quantified. We show that the layer of Antarctic Bottom Water denser than 28.36 kg m −3 γ n is exported northward at a rate of 8.4 ± 0.7 Sv, composed of 4.5 ± 0.3 Sv of well-ventilated Dense Shelf Water, and 3.9 ± 0.5 Sv of old Circumpolar Deep Water entrained into cascading plumes. The majority, but not all, of the Dense Shelf Water (3.4 ± 0.6 Sv) is generated on the continental shelves of the Weddell Sea. Only 55% of AABW exported from the region is well ventilated and thus draws down heat and carbon into the deep ocean. Our findings unify traditionally contrasting views of Antarctic Bottom Water production in the Atlantic sector, and define a baseline, process-discerning target for its realistic representation in climate models. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Weddell Sea Université de Nantes: HAL-UNIV-NANTES Antarctic Southern Ocean Weddell Sea Weddell Scientific Reports 11 1 |