Demons in the North Atlantic: Variability of Deep Ocean Ventilation
International audience Translation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so called "Demon" that prevents access to all...
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ftccsdartic:oai:HAL:insu-03683267v1 2023-12-17T10:33:03+01:00 Demons in the North Atlantic: Variability of Deep Ocean Ventilation Macgilchrist, G. A. Johnson, H. L. Lique, C. Marshall, D. P. 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) 2021 https://insu.hal.science/insu-03683267 https://insu.hal.science/insu-03683267/document https://insu.hal.science/insu-03683267/file/83058.pdf https://doi.org/10.1029/2020GL092340 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL092340 insu-03683267 https://insu.hal.science/insu-03683267 https://insu.hal.science/insu-03683267/document https://insu.hal.science/insu-03683267/file/83058.pdf BIBCODE: 2021GeoRL.4892340M doi:10.1029/2020GL092340 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-03683267 Geophysical Research Letters, 2021, 48, ⟨10.1029/2020GL092340⟩ dense water formation Labrador Sea Lagrangian North Atlantic ocean mixed layer ocean ventilation [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1029/2020GL092340 2023-11-19T00:09:57Z International audience Translation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so called "Demon" that prevents access to all except late winter mixed layer water. Here, we use an eddy permitting numerical circulation model to investigate a similar process operating on longer (interannual) timescales in the subpolar North Atlantic. We find that variations in atmospheric forcing are mediated in their translation to the ocean interior, with year to year changes in the late winter mixed layer depth being the critical factor. The signature of persistent strong atmospheric forcing driving deep mixed layers is preferentially ventilated to the interior when the forcing is ceased. Susceptibility to this effect depends on the location and density of subduction—with the rate at which newly ventilated water escapes its region of subduction being the crucial factor. Article in Journal/Newspaper Labrador Sea North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geophysical Research Letters 48 9 |
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 |
dense water formation Labrador Sea Lagrangian North Atlantic ocean mixed layer ocean ventilation [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
dense water formation Labrador Sea Lagrangian North Atlantic ocean mixed layer ocean ventilation [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Macgilchrist, G. A. Johnson, H. L. Lique, C. Marshall, D. P. Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
topic_facet |
dense water formation Labrador Sea Lagrangian North Atlantic ocean mixed layer ocean ventilation [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Translation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so called "Demon" that prevents access to all except late winter mixed layer water. Here, we use an eddy permitting numerical circulation model to investigate a similar process operating on longer (interannual) timescales in the subpolar North Atlantic. We find that variations in atmospheric forcing are mediated in their translation to the ocean interior, with year to year changes in the late winter mixed layer depth being the critical factor. The signature of persistent strong atmospheric forcing driving deep mixed layers is preferentially ventilated to the interior when the forcing is ceased. Susceptibility to this effect depends on the location and density of subduction—with the rate at which newly ventilated water escapes its region of subduction being the crucial factor. |
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, G. A. Johnson, H. L. Lique, C. Marshall, D. P. |
author_facet |
Macgilchrist, G. A. Johnson, H. L. Lique, C. Marshall, D. P. |
author_sort |
Macgilchrist, G. A. |
title |
Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
title_short |
Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
title_full |
Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
title_fullStr |
Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
title_full_unstemmed |
Demons in the North Atlantic: Variability of Deep Ocean Ventilation |
title_sort |
demons in the north atlantic: variability of deep ocean ventilation |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03683267 https://insu.hal.science/insu-03683267/document https://insu.hal.science/insu-03683267/file/83058.pdf https://doi.org/10.1029/2020GL092340 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-03683267 Geophysical Research Letters, 2021, 48, ⟨10.1029/2020GL092340⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL092340 insu-03683267 https://insu.hal.science/insu-03683267 https://insu.hal.science/insu-03683267/document https://insu.hal.science/insu-03683267/file/83058.pdf BIBCODE: 2021GeoRL.4892340M doi:10.1029/2020GL092340 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020GL092340 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
9 |
_version_ |
1785586928619356160 |