Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic
International audience A direct method is presented to obtain the meridional overturning and heat transport in oceanic basins from observations under the sole assumptions of geostrophy and hydrostatics. The method is made possible because of the rising Argo float displacements database that can prov...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://insu.hal.science/insu-03683189 https://insu.hal.science/insu-03683189/document https://insu.hal.science/insu-03683189/file/JGR%20Oceans%20-%202019%20-%20Colin%20de%20Verdi%20re%20-%20Meridional%20Overturning%20and%20Heat%20Transport%20From%20Argo%20Floats%20Displacements%20and%20the.pdf https://doi.org/10.1029/2018JC014565 |
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ftinsu:oai:HAL:insu-03683189v1 2024-04-14T08:16:04+00:00 Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic Colin de Verdière, Alain Meunier, Thomas Ollitrault, Michel 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) 2019 https://insu.hal.science/insu-03683189 https://insu.hal.science/insu-03683189/document https://insu.hal.science/insu-03683189/file/JGR%20Oceans%20-%202019%20-%20Colin%20de%20Verdi%20re%20-%20Meridional%20Overturning%20and%20Heat%20Transport%20From%20Argo%20Floats%20Displacements%20and%20the.pdf https://doi.org/10.1029/2018JC014565 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014565 insu-03683189 https://insu.hal.science/insu-03683189 https://insu.hal.science/insu-03683189/document https://insu.hal.science/insu-03683189/file/JGR%20Oceans%20-%202019%20-%20Colin%20de%20Verdi%20re%20-%20Meridional%20Overturning%20and%20Heat%20Transport%20From%20Argo%20Floats%20Displacements%20and%20the.pdf BIBCODE: 2019JGRC.124.6270C doi:10.1029/2018JC014565 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://insu.hal.science/insu-03683189 Journal of Geophysical Research. Oceans, 2019, 124, pp.6270-6285. ⟨10.1029/2018JC014565⟩ oceanic heat transport meridional overturning subpolar Atlantic [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1029/2018JC014565 2024-03-21T17:13:45Z International audience A direct method is presented to obtain the meridional overturning and heat transport in oceanic basins from observations under the sole assumptions of geostrophy and hydrostatics. The method is made possible because of the rising Argo float displacements database that can provide a reference level at 1000 dbar for the time mean circulation at 1° × 1° resolution. To achieve the overturning and heat transport objectives, the absolute geostrophic time mean circulation must have nondivergent barotropic transports and this requires the solutions of two Poisson equations with suitable boundary conditions, one for the geopotential at 1000 dbar and one for the barotropic stream function. Applied to the subpolar Atlantic for the period 2000-2009, an overturning of 16-18 Sv is found around 40-50°N, and a meridional heat transport of 0.59 petawatt (PW, 1 PW = 10 15 W) is found at 40°N (0.23 PW at 60°N) so that on average 50 W/m 2 is exported from ocean to atmosphere to feed the atmospheric storm track. The zonally averaged flow (the overturning) falls short of explaining the observed heat transport, and the barotropic component of the circulation accounts for up to 50% of the heat transport poleward of 55°N. With the rising Argo float database, the method offers high potential to reconstruct the World Ocean time mean circulation and its heat transport away from the equator at higher resolution. The drawback is that it requires in some critical places additional current observations on the shallow shelves that are not sampled by the Argo floats. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Oceans 124 8 6270 6285 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
oceanic heat transport meridional overturning subpolar Atlantic [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
oceanic heat transport meridional overturning subpolar Atlantic [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Colin de Verdière, Alain Meunier, Thomas Ollitrault, Michel Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
topic_facet |
oceanic heat transport meridional overturning subpolar Atlantic [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience A direct method is presented to obtain the meridional overturning and heat transport in oceanic basins from observations under the sole assumptions of geostrophy and hydrostatics. The method is made possible because of the rising Argo float displacements database that can provide a reference level at 1000 dbar for the time mean circulation at 1° × 1° resolution. To achieve the overturning and heat transport objectives, the absolute geostrophic time mean circulation must have nondivergent barotropic transports and this requires the solutions of two Poisson equations with suitable boundary conditions, one for the geopotential at 1000 dbar and one for the barotropic stream function. Applied to the subpolar Atlantic for the period 2000-2009, an overturning of 16-18 Sv is found around 40-50°N, and a meridional heat transport of 0.59 petawatt (PW, 1 PW = 10 15 W) is found at 40°N (0.23 PW at 60°N) so that on average 50 W/m 2 is exported from ocean to atmosphere to feed the atmospheric storm track. The zonally averaged flow (the overturning) falls short of explaining the observed heat transport, and the barotropic component of the circulation accounts for up to 50% of the heat transport poleward of 55°N. With the rising Argo float database, the method offers high potential to reconstruct the World Ocean time mean circulation and its heat transport away from the equator at higher resolution. The drawback is that it requires in some critical places additional current observations on the shallow shelves that are not sampled by the Argo floats. |
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 |
Colin de Verdière, Alain Meunier, Thomas Ollitrault, Michel |
author_facet |
Colin de Verdière, Alain Meunier, Thomas Ollitrault, Michel |
author_sort |
Colin de Verdière, Alain |
title |
Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
title_short |
Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
title_full |
Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
title_fullStr |
Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
title_full_unstemmed |
Meridional Overturning and Heat Transport From Argo Floats Displacements and the Planetary Geostrophic Method (PGM): Application to the subpolar North Atlantic |
title_sort |
meridional overturning and heat transport from argo floats displacements and the planetary geostrophic method (pgm): application to the subpolar north atlantic |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://insu.hal.science/insu-03683189 https://insu.hal.science/insu-03683189/document https://insu.hal.science/insu-03683189/file/JGR%20Oceans%20-%202019%20-%20Colin%20de%20Verdi%20re%20-%20Meridional%20Overturning%20and%20Heat%20Transport%20From%20Argo%20Floats%20Displacements%20and%20the.pdf https://doi.org/10.1029/2018JC014565 |
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-03683189 Journal of Geophysical Research. Oceans, 2019, 124, pp.6270-6285. ⟨10.1029/2018JC014565⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014565 insu-03683189 https://insu.hal.science/insu-03683189 https://insu.hal.science/insu-03683189/document https://insu.hal.science/insu-03683189/file/JGR%20Oceans%20-%202019%20-%20Colin%20de%20Verdi%20re%20-%20Meridional%20Overturning%20and%20Heat%20Transport%20From%20Argo%20Floats%20Displacements%20and%20the.pdf BIBCODE: 2019JGRC.124.6270C doi:10.1029/2018JC014565 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018JC014565 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
8 |
container_start_page |
6270 |
op_container_end_page |
6285 |
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