Characterizing the chaotic nature of ocean ventilation
International audience Ventilation of the upper ocean plays an important role in climate variability on interannual to decadal timescales by influencing the exchange of heat and carbon dioxide between the atmosphere and ocean. The turbulent nature of ocean circulation, manifest in a vigorous mesosca...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
|
Subjects: | |
Online Access: | https://insu.hal.science/insu-03682737 https://insu.hal.science/insu-03682737/document https://insu.hal.science/insu-03682737/file/JGR%20Oceans%20-%202017%20-%20MacGilchrist%20-%20Characterizing%20the%20chaotic%20nature%20of%20ocean%20ventilation.pdf https://doi.org/10.1002/2017JC012875 |
id |
ftccsdartic:oai:HAL:insu-03682737v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:insu-03682737v1 2023-12-17T10:46:20+01:00 Characterizing the chaotic nature of ocean ventilation Macgilchrist, Graeme A. Marshall, David P. Johnson, Helen L. Lique, Camille Thomas, Matthew 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) 2017 https://insu.hal.science/insu-03682737 https://insu.hal.science/insu-03682737/document https://insu.hal.science/insu-03682737/file/JGR%20Oceans%20-%202017%20-%20MacGilchrist%20-%20Characterizing%20the%20chaotic%20nature%20of%20ocean%20ventilation.pdf https://doi.org/10.1002/2017JC012875 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC012875 insu-03682737 https://insu.hal.science/insu-03682737 https://insu.hal.science/insu-03682737/document https://insu.hal.science/insu-03682737/file/JGR%20Oceans%20-%202017%20-%20MacGilchrist%20-%20Characterizing%20the%20chaotic%20nature%20of%20ocean%20ventilation.pdf BIBCODE: 2017JGRC.122.7577M doi:10.1002/2017JC012875 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-03682737 Journal of Geophysical Research. Oceans, 2017, 122, pp.7577-7594. ⟨10.1002/2017JC012875⟩ ventilation North Atlantic thermocline chaos mesoscale eddies Lagrangian trajectories [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.1002/2017JC012875 2023-11-19T00:10:02Z International audience Ventilation of the upper ocean plays an important role in climate variability on interannual to decadal timescales by influencing the exchange of heat and carbon dioxide between the atmosphere and ocean. The turbulent nature of ocean circulation, manifest in a vigorous mesoscale eddy field, means that pathways of ventilation, once thought to be quasi-laminar, are in fact highly chaotic. We characterize the chaotic nature of ventilation pathways according to a nondimensional "filamentation number," which estimates the reduction in filament width of a ventilated fluid parcel due to mesoscale strain. In the subtropical North Atlantic of an eddy-permitting ocean model, the filamentation number is large everywhere across three upper ocean density surfaces—implying highly chaotic ventilation pathways—and increases with depth. By mapping surface ocean properties onto these density surfaces, we directly resolve the highly filamented structure and confirm that the filamentation number captures its spatial variability. These results have implications for the spreading of atmospherically-derived tracers into the ocean interior. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Geophysical Research: Oceans 122 9 7577 7594 |
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 |
ventilation North Atlantic thermocline chaos mesoscale eddies Lagrangian trajectories [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
ventilation North Atlantic thermocline chaos mesoscale eddies Lagrangian trajectories [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Macgilchrist, Graeme A. Marshall, David P. Johnson, Helen L. Lique, Camille Thomas, Matthew Characterizing the chaotic nature of ocean ventilation |
topic_facet |
ventilation North Atlantic thermocline chaos mesoscale eddies Lagrangian trajectories [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Ventilation of the upper ocean plays an important role in climate variability on interannual to decadal timescales by influencing the exchange of heat and carbon dioxide between the atmosphere and ocean. The turbulent nature of ocean circulation, manifest in a vigorous mesoscale eddy field, means that pathways of ventilation, once thought to be quasi-laminar, are in fact highly chaotic. We characterize the chaotic nature of ventilation pathways according to a nondimensional "filamentation number," which estimates the reduction in filament width of a ventilated fluid parcel due to mesoscale strain. In the subtropical North Atlantic of an eddy-permitting ocean model, the filamentation number is large everywhere across three upper ocean density surfaces—implying highly chaotic ventilation pathways—and increases with depth. By mapping surface ocean properties onto these density surfaces, we directly resolve the highly filamented structure and confirm that the filamentation number captures its spatial variability. These results have implications for the spreading of atmospherically-derived tracers into the ocean interior. |
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 |
Macgilchrist, Graeme A. Marshall, David P. Johnson, Helen L. Lique, Camille Thomas, Matthew |
author_facet |
Macgilchrist, Graeme A. Marshall, David P. Johnson, Helen L. Lique, Camille Thomas, Matthew |
author_sort |
Macgilchrist, Graeme A. |
title |
Characterizing the chaotic nature of ocean ventilation |
title_short |
Characterizing the chaotic nature of ocean ventilation |
title_full |
Characterizing the chaotic nature of ocean ventilation |
title_fullStr |
Characterizing the chaotic nature of ocean ventilation |
title_full_unstemmed |
Characterizing the chaotic nature of ocean ventilation |
title_sort |
characterizing the chaotic nature of ocean ventilation |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03682737 https://insu.hal.science/insu-03682737/document https://insu.hal.science/insu-03682737/file/JGR%20Oceans%20-%202017%20-%20MacGilchrist%20-%20Characterizing%20the%20chaotic%20nature%20of%20ocean%20ventilation.pdf https://doi.org/10.1002/2017JC012875 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://insu.hal.science/insu-03682737 Journal of Geophysical Research. Oceans, 2017, 122, pp.7577-7594. ⟨10.1002/2017JC012875⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC012875 insu-03682737 https://insu.hal.science/insu-03682737 https://insu.hal.science/insu-03682737/document https://insu.hal.science/insu-03682737/file/JGR%20Oceans%20-%202017%20-%20MacGilchrist%20-%20Characterizing%20the%20chaotic%20nature%20of%20ocean%20ventilation.pdf BIBCODE: 2017JGRC.122.7577M doi:10.1002/2017JC012875 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017JC012875 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
9 |
container_start_page |
7577 |
op_container_end_page |
7594 |
_version_ |
1785569764514463744 |