The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle
International audience Submesoscale dynamics are typically intensified at boundaries and assumed to weaken below the mixed layer in the open ocean. Here, we assess both the seasonality and the vertical distribution of submesoscale motions in an open-ocean region of the northeast Atlantic. Second-ord...
Published in: | Journal of Physical Oceanography |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://insu.hal.science/insu-03683241 https://insu.hal.science/insu-03683241/document https://insu.hal.science/insu-03683241/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Vertical%20Structure%20of%20Open-Ocean%20Submesoscale%20Variability%20during%20a%20Full%20Seasonal%20Cycle.pdf https://doi.org/10.1175/JPO-D-19-0030.1 |
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ftccsdartic:oai:HAL:insu-03683241v1 2023-12-17T10:47:22+01:00 The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle Thompson, Andrew F. Callies, Jörn Yu, Xiaolong Garabato, Alberto Naveira Klein, Patrice 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) 2020 https://insu.hal.science/insu-03683241 https://insu.hal.science/insu-03683241/document https://insu.hal.science/insu-03683241/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Vertical%20Structure%20of%20Open-Ocean%20Submesoscale%20Variability%20during%20a%20Full%20Seasonal%20Cycle.pdf https://doi.org/10.1175/JPO-D-19-0030.1 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-19-0030.1 insu-03683241 https://insu.hal.science/insu-03683241 https://insu.hal.science/insu-03683241/document https://insu.hal.science/insu-03683241/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Vertical%20Structure%20of%20Open-Ocean%20Submesoscale%20Variability%20during%20a%20Full%20Seasonal%20Cycle.pdf BIBCODE: 2020JPO.50.145E doi:10.1175/JPO-D-19-0030.1 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess JOURNAL OF PHYSICAL OCEANOGRAPHY https://insu.hal.science/insu-03683241 JOURNAL OF PHYSICAL OCEANOGRAPHY, 2020, 50, pp.145-160. ⟨10.1175/JPO-D-19-0030.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1175/JPO-D-19-0030.1 2023-11-19T00:09:57Z International audience Submesoscale dynamics are typically intensified at boundaries and assumed to weaken below the mixed layer in the open ocean. Here, we assess both the seasonality and the vertical distribution of submesoscale motions in an open-ocean region of the northeast Atlantic. Second-order structure functions, or variance in properties separated by distance, are calculated from submesoscale-resolving ocean glider and mooring observations, as well as a 1/48° numerical ocean model. This dataset combines a temporal coverage that extends through a full seasonal cycle, a horizontal resolution that captures spatial scales as small as 1 km, and vertical sampling that provides near-continuous coverage over the upper 1000 m. While kinetic and potential energies undergo a seasonal cycle, being largest during the winter, structure function slopes, influenced by dynamical characteristics, do not exhibit a strong seasonality. Furthermore, structure function slopes show weak vertical variations; there is not a strong change in properties across the base of the mixed layer. Additionally, we compare the observations to output from a high-resolution numerical model. The model does not represent variability associated with superinertial motions and does not capture an observed reduction in submesoscale kinetic energy that occurs throughout the water column in spring. Overall, these results suggest that the transfer of mixed layer submesoscale variability down to depths below the traditionally defined mixed layer is important throughout the weakly stratified subpolar mode waters. Article in Journal/Newspaper Northeast Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Physical Oceanography 50 1 145 160 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Thompson, Andrew F. Callies, Jörn Yu, Xiaolong Garabato, Alberto Naveira Klein, Patrice The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Submesoscale dynamics are typically intensified at boundaries and assumed to weaken below the mixed layer in the open ocean. Here, we assess both the seasonality and the vertical distribution of submesoscale motions in an open-ocean region of the northeast Atlantic. Second-order structure functions, or variance in properties separated by distance, are calculated from submesoscale-resolving ocean glider and mooring observations, as well as a 1/48° numerical ocean model. This dataset combines a temporal coverage that extends through a full seasonal cycle, a horizontal resolution that captures spatial scales as small as 1 km, and vertical sampling that provides near-continuous coverage over the upper 1000 m. While kinetic and potential energies undergo a seasonal cycle, being largest during the winter, structure function slopes, influenced by dynamical characteristics, do not exhibit a strong seasonality. Furthermore, structure function slopes show weak vertical variations; there is not a strong change in properties across the base of the mixed layer. Additionally, we compare the observations to output from a high-resolution numerical model. The model does not represent variability associated with superinertial motions and does not capture an observed reduction in submesoscale kinetic energy that occurs throughout the water column in spring. Overall, these results suggest that the transfer of mixed layer submesoscale variability down to depths below the traditionally defined mixed layer is important throughout the weakly stratified subpolar mode waters. |
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 |
Thompson, Andrew F. Callies, Jörn Yu, Xiaolong Garabato, Alberto Naveira Klein, Patrice |
author_facet |
Thompson, Andrew F. Callies, Jörn Yu, Xiaolong Garabato, Alberto Naveira Klein, Patrice |
author_sort |
Thompson, Andrew F. |
title |
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
title_short |
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
title_full |
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
title_fullStr |
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
title_full_unstemmed |
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle |
title_sort |
vertical structure of open-ocean submesoscale variability during a full seasonal cycle |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://insu.hal.science/insu-03683241 https://insu.hal.science/insu-03683241/document https://insu.hal.science/insu-03683241/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Vertical%20Structure%20of%20Open-Ocean%20Submesoscale%20Variability%20during%20a%20Full%20Seasonal%20Cycle.pdf https://doi.org/10.1175/JPO-D-19-0030.1 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
JOURNAL OF PHYSICAL OCEANOGRAPHY https://insu.hal.science/insu-03683241 JOURNAL OF PHYSICAL OCEANOGRAPHY, 2020, 50, pp.145-160. ⟨10.1175/JPO-D-19-0030.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-19-0030.1 insu-03683241 https://insu.hal.science/insu-03683241 https://insu.hal.science/insu-03683241/document https://insu.hal.science/insu-03683241/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Vertical%20Structure%20of%20Open-Ocean%20Submesoscale%20Variability%20during%20a%20Full%20Seasonal%20Cycle.pdf BIBCODE: 2020JPO.50.145E doi:10.1175/JPO-D-19-0030.1 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-19-0030.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
50 |
container_issue |
1 |
container_start_page |
145 |
op_container_end_page |
160 |
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1785571221784494080 |