Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models
International audience Ocean circulation is dominated by turbulent geostrophic eddy fields with typical scales ranging from 10 to 300 km. At mesoscales (>50 km), the size of eddy structures varies regionally following the Rossby radius of deformation. The variability of the scale of smaller eddie...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-03084224 https://hal.science/hal-03084224/document https://hal.science/hal-03084224/file/2019JC015827.pdf https://doi.org/10.1029/2019JC015827 |
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ftinsu:oai:HAL:hal-03084224v1 2024-04-28T08:29:50+00:00 Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models Ajayi, Adekunle Le Sommer, Julien Chassignet, Eric Molines, Jean‐marc Xu, Xiaobiao Albert, Aurelie Cosme, Emmanuel 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)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-17-CE01-0009,BOOST-SWOT,Vers des produits de la circulation océanique de surface à la résolution kilométrique : exploitation de la future mission altimétrique SWOT(2017) 2020-05 https://hal.science/hal-03084224 https://hal.science/hal-03084224/document https://hal.science/hal-03084224/file/2019JC015827.pdf https://doi.org/10.1029/2019JC015827 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015827 hal-03084224 https://hal.science/hal-03084224 https://hal.science/hal-03084224/document https://hal.science/hal-03084224/file/2019JC015827.pdf doi:10.1029/2019JC015827 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03084224 Journal of Geophysical Research. Oceans, 2020, 125 (5), ⟨10.1029/2019JC015827⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.1029/2019JC015827 2024-04-05T00:39:09Z International audience Ocean circulation is dominated by turbulent geostrophic eddy fields with typical scales ranging from 10 to 300 km. At mesoscales (>50 km), the size of eddy structures varies regionally following the Rossby radius of deformation. The variability of the scale of smaller eddies is not well known due to the limitations in existing numerical simulations and satellite capability. Nevertheless, it is well established that oceanic flows (<50 km) generally exhibit strong seasonality. In this study, we present a basin‐scale analysis of coherent structures down to 10 km in the North Atlantic Ocean using two submesoscale‐permitting ocean models, a NEMO‐based North Atlantic simulation with a horizontal resolution of 1/60 (NATL60) and an HYCOM‐based Atlantic simulation with a horizontal resolution of 1/50 (HYCOM50). We investigate the spatial and temporal variability of the scale of eddy structures with a particular focus on eddies with scales of 10 to 100 km, and examine the impact of the seasonality of submesoscale energy on the seasonality and distribution of coherent structures in the North Atlantic. Our results show an overall good agreement between the two models in terms of surface wave number spectra and seasonal variability. The key findings of the paper are that (i) the mean size of ocean eddies show strong seasonality; (ii) this seasonality is associated with an increased population of submesoscale eddies (10–50 km) in winter; and (iii) the net release of available potential energy associated with mixed layer instability is responsible for the emergence of the increased population of submesoscale eddies in wintertime. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Oceans 125 5 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 Ajayi, Adekunle Le Sommer, Julien Chassignet, Eric Molines, Jean‐marc Xu, Xiaobiao Albert, Aurelie Cosme, Emmanuel Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Ocean circulation is dominated by turbulent geostrophic eddy fields with typical scales ranging from 10 to 300 km. At mesoscales (>50 km), the size of eddy structures varies regionally following the Rossby radius of deformation. The variability of the scale of smaller eddies is not well known due to the limitations in existing numerical simulations and satellite capability. Nevertheless, it is well established that oceanic flows (<50 km) generally exhibit strong seasonality. In this study, we present a basin‐scale analysis of coherent structures down to 10 km in the North Atlantic Ocean using two submesoscale‐permitting ocean models, a NEMO‐based North Atlantic simulation with a horizontal resolution of 1/60 (NATL60) and an HYCOM‐based Atlantic simulation with a horizontal resolution of 1/50 (HYCOM50). We investigate the spatial and temporal variability of the scale of eddy structures with a particular focus on eddies with scales of 10 to 100 km, and examine the impact of the seasonality of submesoscale energy on the seasonality and distribution of coherent structures in the North Atlantic. Our results show an overall good agreement between the two models in terms of surface wave number spectra and seasonal variability. The key findings of the paper are that (i) the mean size of ocean eddies show strong seasonality; (ii) this seasonality is associated with an increased population of submesoscale eddies (10–50 km) in winter; and (iii) the net release of available potential energy associated with mixed layer instability is responsible for the emergence of the increased population of submesoscale eddies in wintertime. |
author2 |
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)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-17-CE01-0009,BOOST-SWOT,Vers des produits de la circulation océanique de surface à la résolution kilométrique : exploitation de la future mission altimétrique SWOT(2017) |
format |
Article in Journal/Newspaper |
author |
Ajayi, Adekunle Le Sommer, Julien Chassignet, Eric Molines, Jean‐marc Xu, Xiaobiao Albert, Aurelie Cosme, Emmanuel |
author_facet |
Ajayi, Adekunle Le Sommer, Julien Chassignet, Eric Molines, Jean‐marc Xu, Xiaobiao Albert, Aurelie Cosme, Emmanuel |
author_sort |
Ajayi, Adekunle |
title |
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
title_short |
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
title_full |
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
title_fullStr |
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
title_full_unstemmed |
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric‐Resolution Ocean Models |
title_sort |
spatial and temporal variability of the north atlantic eddy field from two kilometric‐resolution ocean models |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03084224 https://hal.science/hal-03084224/document https://hal.science/hal-03084224/file/2019JC015827.pdf https://doi.org/10.1029/2019JC015827 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03084224 Journal of Geophysical Research. Oceans, 2020, 125 (5), ⟨10.1029/2019JC015827⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015827 hal-03084224 https://hal.science/hal-03084224 https://hal.science/hal-03084224/document https://hal.science/hal-03084224/file/2019JC015827.pdf doi:10.1029/2019JC015827 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019JC015827 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
5 |
_version_ |
1797587915584307200 |