The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies
International audience Abstract. The ocean mixed layer is the interface between the ocean interior and the atmosphere or sea ice and plays a key role in climate variability. It is thus critical that numerical models used in climate studies are capable of a good representation of the mixed layer, esp...
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Online Access: | https://hal.science/hal-04284486 https://hal.science/hal-04284486/document https://hal.science/hal-04284486/file/gmd-16-3849-2023.pdf https://doi.org/10.5194/gmd-16-3849-2023 |
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ftinsu:oai:HAL:hal-04284486v1 2024-04-21T08:11:27+00:00 The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies Treguier, Anne, Marie de Boyer Montégut, Clement Bozec, Alexandra Chassignet, Eric, P Fox-Kemper, Baylor Mcc. Hogg, Andy Iovino, Doroteaciro Kiss, Andrew, E Le Sommer, Julien Li, Yiwen Lin, Pengfei Lique, Camille Liu, Hailong Serazin, Guillaume Sidorenko, Dmitry Wang, Qiang Xu, Xiaobio Yeager, Steve 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) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2023-07-12 https://hal.science/hal-04284486 https://hal.science/hal-04284486/document https://hal.science/hal-04284486/file/gmd-16-3849-2023.pdf https://doi.org/10.5194/gmd-16-3849-2023 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/gmd-16-3849-2023 hal-04284486 https://hal.science/hal-04284486 https://hal.science/hal-04284486/document https://hal.science/hal-04284486/file/gmd-16-3849-2023.pdf doi:10.5194/gmd-16-3849-2023 WOS: 001054197300001 info:eu-repo/semantics/OpenAccess ISSN: 1991-9603 EISSN: 1991-959X Geoscientific Model Development https://hal.science/hal-04284486 Geoscientific Model Development, 2023, 16 (13), pp.3849 - 3872. ⟨10.5194/gmd-16-3849-2023⟩ [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.5194/gmd-16-3849-2023 2024-04-05T00:27:42Z International audience Abstract. The ocean mixed layer is the interface between the ocean interior and the atmosphere or sea ice and plays a key role in climate variability. It is thus critical that numerical models used in climate studies are capable of a good representation of the mixed layer, especially its depth. Here we evaluate the mixed-layer depth (MLD) in six pairs of non-eddying (1∘ grid spacing) and eddy-rich (up to 1/16∘) models from the Ocean Model Intercomparison Project (OMIP), forced by a common atmospheric state. For model evaluation, we use an updated MLD dataset computed from observations using the OMIP protocol (a constant density threshold). In winter, low-resolution models exhibit large biases in the deep-water formation regions. These biases are reduced in eddy-rich models but not uniformly across models and regions. The improvement is most noticeable in the mode-water formation regions of the Northern Hemisphere. Results in the Southern Ocean are more contrasted, with biases of either sign remaining at high resolution. In eddy-rich models, mesoscale eddies control the spatial variability in MLD in winter. Contrary to a hypothesis that the deepening of the mixed layer in anticyclones would make the MLD larger globally, eddy-rich models tend to have a shallower mixed layer at most latitudes than coarser models do. In addition, our study highlights the sensitivity of the MLD computation to the choice of a reference level and the spatio-temporal sampling, which motivates new recommendations for MLD computation in future model intercomparison projects. Article in Journal/Newspaper Sea ice Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Geoscientific Model Development 16 13 3849 3872 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Treguier, Anne, Marie de Boyer Montégut, Clement Bozec, Alexandra Chassignet, Eric, P Fox-Kemper, Baylor Mcc. Hogg, Andy Iovino, Doroteaciro Kiss, Andrew, E Le Sommer, Julien Li, Yiwen Lin, Pengfei Lique, Camille Liu, Hailong Serazin, Guillaume Sidorenko, Dmitry Wang, Qiang Xu, Xiaobio Yeager, Steve The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience Abstract. The ocean mixed layer is the interface between the ocean interior and the atmosphere or sea ice and plays a key role in climate variability. It is thus critical that numerical models used in climate studies are capable of a good representation of the mixed layer, especially its depth. Here we evaluate the mixed-layer depth (MLD) in six pairs of non-eddying (1∘ grid spacing) and eddy-rich (up to 1/16∘) models from the Ocean Model Intercomparison Project (OMIP), forced by a common atmospheric state. For model evaluation, we use an updated MLD dataset computed from observations using the OMIP protocol (a constant density threshold). In winter, low-resolution models exhibit large biases in the deep-water formation regions. These biases are reduced in eddy-rich models but not uniformly across models and regions. The improvement is most noticeable in the mode-water formation regions of the Northern Hemisphere. Results in the Southern Ocean are more contrasted, with biases of either sign remaining at high resolution. In eddy-rich models, mesoscale eddies control the spatial variability in MLD in winter. Contrary to a hypothesis that the deepening of the mixed layer in anticyclones would make the MLD larger globally, eddy-rich models tend to have a shallower mixed layer at most latitudes than coarser models do. In addition, our study highlights the sensitivity of the MLD computation to the choice of a reference level and the spatio-temporal sampling, which motivates new recommendations for MLD computation in future model intercomparison projects. |
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) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Treguier, Anne, Marie de Boyer Montégut, Clement Bozec, Alexandra Chassignet, Eric, P Fox-Kemper, Baylor Mcc. Hogg, Andy Iovino, Doroteaciro Kiss, Andrew, E Le Sommer, Julien Li, Yiwen Lin, Pengfei Lique, Camille Liu, Hailong Serazin, Guillaume Sidorenko, Dmitry Wang, Qiang Xu, Xiaobio Yeager, Steve |
author_facet |
Treguier, Anne, Marie de Boyer Montégut, Clement Bozec, Alexandra Chassignet, Eric, P Fox-Kemper, Baylor Mcc. Hogg, Andy Iovino, Doroteaciro Kiss, Andrew, E Le Sommer, Julien Li, Yiwen Lin, Pengfei Lique, Camille Liu, Hailong Serazin, Guillaume Sidorenko, Dmitry Wang, Qiang Xu, Xiaobio Yeager, Steve |
author_sort |
Treguier, Anne, Marie |
title |
The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
title_short |
The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
title_full |
The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
title_fullStr |
The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
title_full_unstemmed |
The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies |
title_sort |
mixed-layer depth in the ocean model intercomparison project (omip): impact of resolving mesoscale eddies |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04284486 https://hal.science/hal-04284486/document https://hal.science/hal-04284486/file/gmd-16-3849-2023.pdf https://doi.org/10.5194/gmd-16-3849-2023 |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
ISSN: 1991-9603 EISSN: 1991-959X Geoscientific Model Development https://hal.science/hal-04284486 Geoscientific Model Development, 2023, 16 (13), pp.3849 - 3872. ⟨10.5194/gmd-16-3849-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/gmd-16-3849-2023 hal-04284486 https://hal.science/hal-04284486 https://hal.science/hal-04284486/document https://hal.science/hal-04284486/file/gmd-16-3849-2023.pdf doi:10.5194/gmd-16-3849-2023 WOS: 001054197300001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/gmd-16-3849-2023 |
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Geoscientific Model Development |
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