Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic
International audience A significant fraction of the Eulerian-mean downwelling feeding the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) occurs along the subpolar North Atlantic continental slopes and is maintained by along-boundary densification and large-scale geostrophic ba...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759/document https://hal.archives-ouvertes.fr/hal-03814759/file/922628_1_merged_1645030745.pdf https://doi.org/10.1029/2021GL097243 |
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ftunivnantes:oai:HAL:hal-03814759v1 2023-05-15T16:00:39+02:00 Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic Liu, Yingjie Desbruyères, Damien Mercier, Herlé Spall, Michael 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) 2022 https://hal.archives-ouvertes.fr/hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759/document https://hal.archives-ouvertes.fr/hal-03814759/file/922628_1_merged_1645030745.pdf https://doi.org/10.1029/2021GL097243 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2021GL097243 hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759/document https://hal.archives-ouvertes.fr/hal-03814759/file/922628_1_merged_1645030745.pdf doi:10.1029/2021GL097243 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03814759 Geophysical Research Letters, American Geophysical Union, 2022, 49 (8), pp.e2021GL097243. ⟨10.1029/2021GL097243⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.1029/2021GL097243 2022-10-18T23:02:05Z International audience A significant fraction of the Eulerian-mean downwelling feeding the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) occurs along the subpolar North Atlantic continental slopes and is maintained by along-boundary densification and large-scale geostrophic balance. We here use Argo and shipboard hydrography data to map the 2002–2015 long-term mean density field along the boundary via a dedicated optimal interpolation tool. The overall downstream densification implies an Eulerian-mean downwelling of 2.12 ± 0.43 Sv at 1100 m depth between Denmark Strait and Flemish Cap. A clear regional pattern emerges with downwelling in the Irminger Sea and western Labrador Sea and upwelling along Greenland western continental slope. Comparisons with independent cross-basin estimates confirm that vertical overturning transport across the marginal seas of the subpolar North Atlantic mainly occurs along the continental slopes, and suggest the usefulness of hydrographic data in providing quantitative information about the sinking branch of the AMOC. Article in Journal/Newspaper Denmark Strait Greenland Labrador Sea North Atlantic Université de Nantes: HAL-UNIV-NANTES Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Geophysical Research Letters 49 8 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
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 Liu, Yingjie Desbruyères, Damien Mercier, Herlé Spall, Michael Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience A significant fraction of the Eulerian-mean downwelling feeding the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) occurs along the subpolar North Atlantic continental slopes and is maintained by along-boundary densification and large-scale geostrophic balance. We here use Argo and shipboard hydrography data to map the 2002–2015 long-term mean density field along the boundary via a dedicated optimal interpolation tool. The overall downstream densification implies an Eulerian-mean downwelling of 2.12 ± 0.43 Sv at 1100 m depth between Denmark Strait and Flemish Cap. A clear regional pattern emerges with downwelling in the Irminger Sea and western Labrador Sea and upwelling along Greenland western continental slope. Comparisons with independent cross-basin estimates confirm that vertical overturning transport across the marginal seas of the subpolar North Atlantic mainly occurs along the continental slopes, and suggest the usefulness of hydrographic data in providing quantitative information about the sinking branch of the AMOC. |
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 |
Liu, Yingjie Desbruyères, Damien Mercier, Herlé Spall, Michael |
author_facet |
Liu, Yingjie Desbruyères, Damien Mercier, Herlé Spall, Michael |
author_sort |
Liu, Yingjie |
title |
Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
title_short |
Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
title_full |
Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
title_fullStr |
Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
title_full_unstemmed |
Observation‐Based Estimates of Eulerian‐Mean Boundary Downwelling in the Western Subpolar North Atlantic |
title_sort |
observation‐based estimates of eulerian‐mean boundary downwelling in the western subpolar north atlantic |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.archives-ouvertes.fr/hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759/document https://hal.archives-ouvertes.fr/hal-03814759/file/922628_1_merged_1645030745.pdf https://doi.org/10.1029/2021GL097243 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Denmark Strait Greenland Labrador Sea North Atlantic |
genre_facet |
Denmark Strait Greenland Labrador Sea North Atlantic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03814759 Geophysical Research Letters, American Geophysical Union, 2022, 49 (8), pp.e2021GL097243. ⟨10.1029/2021GL097243⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021GL097243 hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759 https://hal.archives-ouvertes.fr/hal-03814759/document https://hal.archives-ouvertes.fr/hal-03814759/file/922628_1_merged_1645030745.pdf doi:10.1029/2021GL097243 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021GL097243 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
8 |
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1766396660938702848 |