A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland
International audience The meridional overturning circulation (MOC) in the North Atlantic plays a major role in the transport of heat from low to high latitudes. In this study, we combine recent measurements of currents from the surface to >700 m from a shipboard acoustic Doppler current profiler...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.science/hal-01630799 https://hal.science/hal-01630799/document https://hal.science/hal-01630799/file/JGR%20Oceans%20-%202017%20-%20Rossby%20-%20A%20direct%20estimate%20of%20poleward%20volume%20heat%20and%20freshwater%20fluxes%20at%2059%205%20N%20between%20Greenland.pdf https://doi.org/10.1002/2017JC012835 |
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openpolar |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
currents MOC heat flux freshwater flux [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
currents MOC heat flux freshwater flux [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Rossby, T. Reverdin, Gilles Chafik, Léon Søiland, Henrik A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
topic_facet |
currents MOC heat flux freshwater flux [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience The meridional overturning circulation (MOC) in the North Atlantic plays a major role in the transport of heat from low to high latitudes. In this study, we combine recent measurements of currents from the surface to >700 m from a shipboard acoustic Doppler current profiler with Argo profiles (to 2000 m) to estimate poleward volume, heat, and freshwater flux at 59.5°N between Greenland and Scotland. This is made possible thanks to the vessel Nuka Arctica that operates on a 3 week schedule between Greenland and Denmark. For the period late 2012 to early 2016, the deseasoned mean meridional overturning circulation reaches a 18.4 ± 3.4 Sv maximum at the σθ = 27.55 kg m -3 isopycnal, which varies in depth from near the surface in the western Irminger Sea to 1000 m in Rockall Trough. The total heat and freshwater fluxes across 59.5°N = 399 ± 74 TW and −0.20 ± 0.04 Sv, where the uncertainties are principally due to that of the MOC. Analysis of altimetric sea surface height variations along exactly the same route reveals a somewhat stronger geostrophic flow north during this period compared to the 23 year mean suggesting that for a long-term mean the above flux estimates should be reduced slightly to 17.4 Sv, 377 TW, and −0.19 Sv, respectively, with the same estimate uncertainties. The ADCP program is ongoing. |
author2 |
Graduate School of Oceanography Narragansett University of Rhode Island (URI) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) |
format |
Article in Journal/Newspaper |
author |
Rossby, T. Reverdin, Gilles Chafik, Léon Søiland, Henrik |
author_facet |
Rossby, T. Reverdin, Gilles Chafik, Léon Søiland, Henrik |
author_sort |
Rossby, T. |
title |
A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
title_short |
A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
title_full |
A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
title_fullStr |
A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
title_full_unstemmed |
A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland |
title_sort |
direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°n between greenland and scotland |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01630799 https://hal.science/hal-01630799/document https://hal.science/hal-01630799/file/JGR%20Oceans%20-%202017%20-%20Rossby%20-%20A%20direct%20estimate%20of%20poleward%20volume%20heat%20and%20freshwater%20fluxes%20at%2059%205%20N%20between%20Greenland.pdf https://doi.org/10.1002/2017JC012835 |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-01630799 Journal of Geophysical Research. Oceans, 2017, 122 (7), pp.5870 - 5887. ⟨10.1002/2017JC012835⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC012835 hal-01630799 https://hal.science/hal-01630799 https://hal.science/hal-01630799/document https://hal.science/hal-01630799/file/JGR%20Oceans%20-%202017%20-%20Rossby%20-%20A%20direct%20estimate%20of%20poleward%20volume%20heat%20and%20freshwater%20fluxes%20at%2059%205%20N%20between%20Greenland.pdf doi:10.1002/2017JC012835 WOS: 000409893600037 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017JC012835 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
7 |
container_start_page |
5870 |
op_container_end_page |
5887 |
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spelling |
ftinsu:oai:HAL:hal-01630799v1 2024-04-28T08:21:15+00:00 A direct estimate of poleward volume, heat, and freshwater fluxes at 59.5°N between Greenland and Scotland Rossby, T. Reverdin, Gilles Chafik, Léon Søiland, Henrik Graduate School of Oceanography Narragansett University of Rhode Island (URI) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) 2017-07 https://hal.science/hal-01630799 https://hal.science/hal-01630799/document https://hal.science/hal-01630799/file/JGR%20Oceans%20-%202017%20-%20Rossby%20-%20A%20direct%20estimate%20of%20poleward%20volume%20heat%20and%20freshwater%20fluxes%20at%2059%205%20N%20between%20Greenland.pdf https://doi.org/10.1002/2017JC012835 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC012835 hal-01630799 https://hal.science/hal-01630799 https://hal.science/hal-01630799/document https://hal.science/hal-01630799/file/JGR%20Oceans%20-%202017%20-%20Rossby%20-%20A%20direct%20estimate%20of%20poleward%20volume%20heat%20and%20freshwater%20fluxes%20at%2059%205%20N%20between%20Greenland.pdf doi:10.1002/2017JC012835 WOS: 000409893600037 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-01630799 Journal of Geophysical Research. Oceans, 2017, 122 (7), pp.5870 - 5887. ⟨10.1002/2017JC012835⟩ currents MOC heat flux freshwater flux [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1002/2017JC012835 2024-04-05T00:35:45Z International audience The meridional overturning circulation (MOC) in the North Atlantic plays a major role in the transport of heat from low to high latitudes. In this study, we combine recent measurements of currents from the surface to >700 m from a shipboard acoustic Doppler current profiler with Argo profiles (to 2000 m) to estimate poleward volume, heat, and freshwater flux at 59.5°N between Greenland and Scotland. This is made possible thanks to the vessel Nuka Arctica that operates on a 3 week schedule between Greenland and Denmark. For the period late 2012 to early 2016, the deseasoned mean meridional overturning circulation reaches a 18.4 ± 3.4 Sv maximum at the σθ = 27.55 kg m -3 isopycnal, which varies in depth from near the surface in the western Irminger Sea to 1000 m in Rockall Trough. The total heat and freshwater fluxes across 59.5°N = 399 ± 74 TW and −0.20 ± 0.04 Sv, where the uncertainties are principally due to that of the MOC. Analysis of altimetric sea surface height variations along exactly the same route reveals a somewhat stronger geostrophic flow north during this period compared to the 23 year mean suggesting that for a long-term mean the above flux estimates should be reduced slightly to 17.4 Sv, 377 TW, and −0.19 Sv, respectively, with the same estimate uncertainties. The ADCP program is ongoing. Article in Journal/Newspaper Greenland North Atlantic Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Oceans 122 7 5870 5887 |