Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model
International audience Antarctic Intermediate Water (AAIW) is a water mass originating in the Southern Ocean characterised by its low salinity. The properties of the salinity minimum layer that characterise AAIW in the CMIP6 UKESM1 model and its response to different climate change scenarios are inv...
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ftunivnantes:oai:HAL:insu-03683292v1 2023-05-15T13:47:17+02:00 Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model Meuriot, Ophélie Lique, Camille Plancherel, Yves Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2022 https://hal-insu.archives-ouvertes.fr/insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292/document https://hal-insu.archives-ouvertes.fr/insu-03683292/file/Meuriot2022_Article_PropertiesSensitivityAndStabil.pdf https://doi.org/10.1007/s00382-022-06304-2 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-022-06304-2 insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292/document https://hal-insu.archives-ouvertes.fr/insu-03683292/file/Meuriot2022_Article_PropertiesSensitivityAndStabil.pdf BIBCODE: 2022ClDy.tmp.212M doi:10.1007/s00382-022-06304-2 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal-insu.archives-ouvertes.fr/insu-03683292 Climate Dynamics, Springer Verlag, 2022, ⟨10.1007/s00382-022-06304-2⟩ AAIW UKESM1 CMIP6 Southern Ocean [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.1007/s00382-022-06304-2 2022-10-04T23:19:12Z International audience Antarctic Intermediate Water (AAIW) is a water mass originating in the Southern Ocean characterised by its low salinity. The properties of the salinity minimum layer that characterise AAIW in the CMIP6 UKESM1 model and its response to different climate change scenarios are investigated. In UKESM1, the depth of the salinity minimum shoals by 116 m in the SSP5-8.5 run compared to the control run by 2080-2100. The salinity minimum also gets warmer (+ 1.9 °C) and lighter (− 0.4 kg/m 3 ) and surface properties where the salinity minimum outcrops warm, freshen and lighten in all scenarios. In spite of these expected changes in properties, the location where the salinity minimum outcrops does not change in any of the future scenarios. The stability of the outcrop location of the salinity minimum is linked to the relative stability of the position of the Antarctic Circumpolar Current (ACC) in UKESM1. The position of the ACC does not follow the maximum wind stress trend, which intensifies and shifts poleward under radiative forcing. Changes in surface buoyancy fluxes in the region are consistent with the changes in hydrographic properties observed at depth on the salinity minimum mentioned above. However, transformation rates at the density corresponding to the salinity minimum outcrop remain constant in all scenarios. Stability in transformation rates at that density is due to the haline and thermal contributions counteracting one another. This analysis identifies two features (outcrop location, transformation rate) associated with the salinity minimum defining AAIW that show remarkable stability in an otherwise changing world. The effect of model resolution and other parameterisations on these findings have yet to be evaluated. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Southern Ocean The Antarctic Climate Dynamics |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
AAIW UKESM1 CMIP6 Southern Ocean [SDU]Sciences of the Universe [physics] |
spellingShingle |
AAIW UKESM1 CMIP6 Southern Ocean [SDU]Sciences of the Universe [physics] Meuriot, Ophélie Lique, Camille Plancherel, Yves Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
topic_facet |
AAIW UKESM1 CMIP6 Southern Ocean [SDU]Sciences of the Universe [physics] |
description |
International audience Antarctic Intermediate Water (AAIW) is a water mass originating in the Southern Ocean characterised by its low salinity. The properties of the salinity minimum layer that characterise AAIW in the CMIP6 UKESM1 model and its response to different climate change scenarios are investigated. In UKESM1, the depth of the salinity minimum shoals by 116 m in the SSP5-8.5 run compared to the control run by 2080-2100. The salinity minimum also gets warmer (+ 1.9 °C) and lighter (− 0.4 kg/m 3 ) and surface properties where the salinity minimum outcrops warm, freshen and lighten in all scenarios. In spite of these expected changes in properties, the location where the salinity minimum outcrops does not change in any of the future scenarios. The stability of the outcrop location of the salinity minimum is linked to the relative stability of the position of the Antarctic Circumpolar Current (ACC) in UKESM1. The position of the ACC does not follow the maximum wind stress trend, which intensifies and shifts poleward under radiative forcing. Changes in surface buoyancy fluxes in the region are consistent with the changes in hydrographic properties observed at depth on the salinity minimum mentioned above. However, transformation rates at the density corresponding to the salinity minimum outcrop remain constant in all scenarios. Stability in transformation rates at that density is due to the haline and thermal contributions counteracting one another. This analysis identifies two features (outcrop location, transformation rate) associated with the salinity minimum defining AAIW that show remarkable stability in an otherwise changing world. The effect of model resolution and other parameterisations on these findings have yet to be evaluated. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Meuriot, Ophélie Lique, Camille Plancherel, Yves |
author_facet |
Meuriot, Ophélie Lique, Camille Plancherel, Yves |
author_sort |
Meuriot, Ophélie |
title |
Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
title_short |
Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
title_full |
Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
title_fullStr |
Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
title_full_unstemmed |
Properties, sensitivity, and stability of the Southern Hemisphere salinity minimum layer in the UKESM1 model |
title_sort |
properties, sensitivity, and stability of the southern hemisphere salinity minimum layer in the ukesm1 model |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292/document https://hal-insu.archives-ouvertes.fr/insu-03683292/file/Meuriot2022_Article_PropertiesSensitivityAndStabil.pdf https://doi.org/10.1007/s00382-022-06304-2 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal-insu.archives-ouvertes.fr/insu-03683292 Climate Dynamics, Springer Verlag, 2022, ⟨10.1007/s00382-022-06304-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-022-06304-2 insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292 https://hal-insu.archives-ouvertes.fr/insu-03683292/document https://hal-insu.archives-ouvertes.fr/insu-03683292/file/Meuriot2022_Article_PropertiesSensitivityAndStabil.pdf BIBCODE: 2022ClDy.tmp.212M doi:10.1007/s00382-022-06304-2 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00382-022-06304-2 |
container_title |
Climate Dynamics |
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1766246851657334784 |