Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas
International audience The Southern Ocean upper-layer freshwater balance exerts a global climatic influence by modulating density stratification and biological productivity, and hence the exchange of heat and carbon between the atmosphere and the ocean interior. It is thus important to understand an...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://insu.hal.science/insu-04139548 https://insu.hal.science/insu-04139548/document https://insu.hal.science/insu-04139548/file/rsta.2022.0162.pdf https://doi.org/10.1098/rsta.2022.0162 |
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ftuniparissaclay:oai:HAL:insu-04139548v1 |
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Open Polar |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
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English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Meredith, Michael P. Povl Abrahamsen, E. Alexander Haumann, F. Leng, Melanie J. Arrowsmith, Carol Barham, Mark Firing, Yvonne L. King, Brian A. Brown, Peter Alexander Brearley, J. Meijers, Andrew J. S. Sallée, Jean-Baptiste Akhoudas, Camille Tarling, Geraint A. Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The Southern Ocean upper-layer freshwater balance exerts a global climatic influence by modulating density stratification and biological productivity, and hence the exchange of heat and carbon between the atmosphere and the ocean interior. It is thus important to understand and quantify the time-varying freshwater inputs, which is challenging from measurements of salinity alone. Here we use seawater oxygen isotopes from samples collected between 2016 and 2021 along a transect spanning the Scotia and northern Weddell Seas to separate the freshwater contributions from sea ice and meteoric sources. The unprecedented retreat of sea ice in 2016 is evidenced as a strong increase in sea ice melt across the northern Weddell Sea, with surface values increasing approximately two percentage points between 2016 and 2018 and column inventories increasing approximately 1 to 2 m. Surface meteoric water concentrations exceeded 4% in early 2021 close to South Georgia due to meltwater from the A68 megaberg; smaller icebergs may influence meteoric water at other times also. Both these inputs highlight the importance of a changing cryosphere for upper-ocean freshening; potential future sea ice retreats and increases in iceberg calving would enhance the impacts of these freshwater sources on the ocean and climate. This article is part of a discussion meeting issue `Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities'. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Atmospheric and Oceanic Sciences Program Princeton (AOS Program) NOAA Geophysical Fluid Dynamics Laboratory (GFDL) National Oceanic and Atmospheric Administration (NOAA)-National Oceanic and Atmospheric Administration (NOAA)-Princeton University National Oceanography Centre (NOC) 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) European Project: 821001,SO-CHIC(2019) |
format |
Article in Journal/Newspaper |
author |
Meredith, Michael P. Povl Abrahamsen, E. Alexander Haumann, F. Leng, Melanie J. Arrowsmith, Carol Barham, Mark Firing, Yvonne L. King, Brian A. Brown, Peter Alexander Brearley, J. Meijers, Andrew J. S. Sallée, Jean-Baptiste Akhoudas, Camille Tarling, Geraint A. |
author_facet |
Meredith, Michael P. Povl Abrahamsen, E. Alexander Haumann, F. Leng, Melanie J. Arrowsmith, Carol Barham, Mark Firing, Yvonne L. King, Brian A. Brown, Peter Alexander Brearley, J. Meijers, Andrew J. S. Sallée, Jean-Baptiste Akhoudas, Camille Tarling, Geraint A. |
author_sort |
Meredith, Michael P. |
title |
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
title_short |
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
title_full |
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
title_fullStr |
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
title_full_unstemmed |
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas |
title_sort |
tracing the impacts of recent rapid sea ice changes and the a68 megaberg on the surface freshwater balance of the weddell and scotia seas |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://insu.hal.science/insu-04139548 https://insu.hal.science/insu-04139548/document https://insu.hal.science/insu-04139548/file/rsta.2022.0162.pdf https://doi.org/10.1098/rsta.2022.0162 |
genre |
Sea ice Southern Ocean Weddell Sea |
genre_facet |
Sea ice Southern Ocean Weddell Sea |
op_source |
ISSN: 1364-503X EISSN: 1471-2962 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences https://insu.hal.science/insu-04139548 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2023, 381, ⟨10.1098/rsta.2022.0162⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1098/rsta.2022.0162 info:eu-repo/grantAgreement//821001/EU/Southern Ocean Carbon and Heat Impact on Climate/SO-CHIC insu-04139548 https://insu.hal.science/insu-04139548 https://insu.hal.science/insu-04139548/document https://insu.hal.science/insu-04139548/file/rsta.2022.0162.pdf BIBCODE: 2023RSPTA.38120162M doi:10.1098/rsta.2022.0162 WOS: 000983226900001 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1098/rsta.2022.0162 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
381 |
container_issue |
2249 |
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1799488806626263040 |
spelling |
ftuniparissaclay:oai:HAL:insu-04139548v1 2024-05-19T07:48:16+00:00 Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas Meredith, Michael P. Povl Abrahamsen, E. Alexander Haumann, F. Leng, Melanie J. Arrowsmith, Carol Barham, Mark Firing, Yvonne L. King, Brian A. Brown, Peter Alexander Brearley, J. Meijers, Andrew J. S. Sallée, Jean-Baptiste Akhoudas, Camille Tarling, Geraint A. British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Atmospheric and Oceanic Sciences Program Princeton (AOS Program) NOAA Geophysical Fluid Dynamics Laboratory (GFDL) National Oceanic and Atmospheric Administration (NOAA)-National Oceanic and Atmospheric Administration (NOAA)-Princeton University National Oceanography Centre (NOC) 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) European Project: 821001,SO-CHIC(2019) 2023 https://insu.hal.science/insu-04139548 https://insu.hal.science/insu-04139548/document https://insu.hal.science/insu-04139548/file/rsta.2022.0162.pdf https://doi.org/10.1098/rsta.2022.0162 en eng HAL CCSD Royal Society, The info:eu-repo/semantics/altIdentifier/doi/10.1098/rsta.2022.0162 info:eu-repo/grantAgreement//821001/EU/Southern Ocean Carbon and Heat Impact on Climate/SO-CHIC insu-04139548 https://insu.hal.science/insu-04139548 https://insu.hal.science/insu-04139548/document https://insu.hal.science/insu-04139548/file/rsta.2022.0162.pdf BIBCODE: 2023RSPTA.38120162M doi:10.1098/rsta.2022.0162 WOS: 000983226900001 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1364-503X EISSN: 1471-2962 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences https://insu.hal.science/insu-04139548 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2023, 381, ⟨10.1098/rsta.2022.0162⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftuniparissaclay https://doi.org/10.1098/rsta.2022.0162 2024-04-22T17:29:03Z International audience The Southern Ocean upper-layer freshwater balance exerts a global climatic influence by modulating density stratification and biological productivity, and hence the exchange of heat and carbon between the atmosphere and the ocean interior. It is thus important to understand and quantify the time-varying freshwater inputs, which is challenging from measurements of salinity alone. Here we use seawater oxygen isotopes from samples collected between 2016 and 2021 along a transect spanning the Scotia and northern Weddell Seas to separate the freshwater contributions from sea ice and meteoric sources. The unprecedented retreat of sea ice in 2016 is evidenced as a strong increase in sea ice melt across the northern Weddell Sea, with surface values increasing approximately two percentage points between 2016 and 2018 and column inventories increasing approximately 1 to 2 m. Surface meteoric water concentrations exceeded 4% in early 2021 close to South Georgia due to meltwater from the A68 megaberg; smaller icebergs may influence meteoric water at other times also. Both these inputs highlight the importance of a changing cryosphere for upper-ocean freshening; potential future sea ice retreats and increases in iceberg calving would enhance the impacts of these freshwater sources on the ocean and climate. This article is part of a discussion meeting issue `Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities'. Article in Journal/Newspaper Sea ice Southern Ocean Weddell Sea Archives ouvertes de Paris-Saclay Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 381 2249 |