Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean
International audience The Southern Ocean is responsible for the majority of the global oceanic heat uptake that contributes to global sea level rise. At the same time, ocean temperatures do not change at the same rate in all regions and sea level variability is also affected by changes in salinity....
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Online Access: | https://insu.hal.science/insu-03636629 https://insu.hal.science/insu-03636629/document https://insu.hal.science/insu-03636629/file/JGR%20Oceans%20-%202021%20-%20Kolbe%20-%20Impact%20of%20Thermohaline%20Variability%20on%20Sea%20Level%20Changes%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1029/2021JC017381 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Kolbe, Marlen Roquet, Fabien Pauthenet, Etienne Nerini, David Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Southern Ocean is responsible for the majority of the global oceanic heat uptake that contributes to global sea level rise. At the same time, ocean temperatures do not change at the same rate in all regions and sea level variability is also affected by changes in salinity. This study investigates 10 years of steric height variability (2008-2017) in the Southern Ocean (30°S to 70°S) by analyzing temperature and salinity variations obtained from the GLORYS-031 model provided by the European Copernicus Marine Environment Monitoring Service. The thermohaline variability is decomposed into thermohaline modes using a functional Principal Component Analysis. Thermohaline modes provide a natural basis to decompose the joint temperature-salinity vertical profiles into a sum of vertical modes weighted by their respective principal components that can be related to steric height. Interannual steric height trends are found to differ significantly between subtropical and subpolar regions, simultaneously with a shift from a thermohaline stratification dominated by the first "thermal" mode in the north to the second 'saline' mode in the South. The Polar Front appears as a natural boundary between the two regions, where steric height variations are minimized. Despite higher melt rates and atmospheric temperatures, steric height in Antarctic waters (0-2,000 m) has dropped since 2008 due to higher salt content in the surface and upper intermediate layer and partially colder waters, while subtropical waters farther north have mostly risen due to increased heat storage. |
author2 |
University of Groningen Groningen Department of Marine Sciences Gothenburg Göteborgs Universitet = University of Gothenburg (GU) 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) 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) |
format |
Article in Journal/Newspaper |
author |
Kolbe, Marlen Roquet, Fabien Pauthenet, Etienne Nerini, David |
author_facet |
Kolbe, Marlen Roquet, Fabien Pauthenet, Etienne Nerini, David |
author_sort |
Kolbe, Marlen |
title |
Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
title_short |
Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
title_full |
Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
title_fullStr |
Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
title_full_unstemmed |
Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean |
title_sort |
impact of thermohaline variability on sea level changes in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03636629 https://insu.hal.science/insu-03636629/document https://insu.hal.science/insu-03636629/file/JGR%20Oceans%20-%202021%20-%20Kolbe%20-%20Impact%20of%20Thermohaline%20Variability%20on%20Sea%20Level%20Changes%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1029/2021JC017381 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://insu.hal.science/insu-03636629 Journal of Geophysical Research. Oceans, 2021, 126, ⟨10.1029/2021JC017381⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC017381 insu-03636629 https://insu.hal.science/insu-03636629 https://insu.hal.science/insu-03636629/document https://insu.hal.science/insu-03636629/file/JGR%20Oceans%20-%202021%20-%20Kolbe%20-%20Impact%20of%20Thermohaline%20Variability%20on%20Sea%20Level%20Changes%20in%20the%20Southern%20Ocean.pdf BIBCODE: 2021JGRC.12617381K doi:10.1029/2021JC017381 WOS: 000702389500018 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JC017381 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
9 |
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1799478868613005312 |
spelling |
ftsorbonneuniv:oai:HAL:insu-03636629v1 2024-05-19T07:29:22+00:00 Impact of Thermohaline Variability on Sea Level Changes in the Southern Ocean Kolbe, Marlen Roquet, Fabien Pauthenet, Etienne Nerini, David University of Groningen Groningen Department of Marine Sciences Gothenburg Göteborgs Universitet = University of Gothenburg (GU) 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) 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) 2021 https://insu.hal.science/insu-03636629 https://insu.hal.science/insu-03636629/document https://insu.hal.science/insu-03636629/file/JGR%20Oceans%20-%202021%20-%20Kolbe%20-%20Impact%20of%20Thermohaline%20Variability%20on%20Sea%20Level%20Changes%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1029/2021JC017381 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC017381 insu-03636629 https://insu.hal.science/insu-03636629 https://insu.hal.science/insu-03636629/document https://insu.hal.science/insu-03636629/file/JGR%20Oceans%20-%202021%20-%20Kolbe%20-%20Impact%20of%20Thermohaline%20Variability%20on%20Sea%20Level%20Changes%20in%20the%20Southern%20Ocean.pdf BIBCODE: 2021JGRC.12617381K doi:10.1029/2021JC017381 WOS: 000702389500018 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://insu.hal.science/insu-03636629 Journal of Geophysical Research. Oceans, 2021, 126, ⟨10.1029/2021JC017381⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftsorbonneuniv https://doi.org/10.1029/2021JC017381 2024-04-25T03:54:24Z International audience The Southern Ocean is responsible for the majority of the global oceanic heat uptake that contributes to global sea level rise. At the same time, ocean temperatures do not change at the same rate in all regions and sea level variability is also affected by changes in salinity. This study investigates 10 years of steric height variability (2008-2017) in the Southern Ocean (30°S to 70°S) by analyzing temperature and salinity variations obtained from the GLORYS-031 model provided by the European Copernicus Marine Environment Monitoring Service. The thermohaline variability is decomposed into thermohaline modes using a functional Principal Component Analysis. Thermohaline modes provide a natural basis to decompose the joint temperature-salinity vertical profiles into a sum of vertical modes weighted by their respective principal components that can be related to steric height. Interannual steric height trends are found to differ significantly between subtropical and subpolar regions, simultaneously with a shift from a thermohaline stratification dominated by the first "thermal" mode in the north to the second 'saline' mode in the South. The Polar Front appears as a natural boundary between the two regions, where steric height variations are minimized. Despite higher melt rates and atmospheric temperatures, steric height in Antarctic waters (0-2,000 m) has dropped since 2008 due to higher salt content in the surface and upper intermediate layer and partially colder waters, while subtropical waters farther north have mostly risen due to increased heat storage. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean HAL Sorbonne Université Journal of Geophysical Research: Oceans 126 9 |