The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004
International audience The horizontal circulation of the subpolar gyre and the Meridional Overturning Circulation (MOC) are investigated here by comparing two snapshots of the North Atlantic as delivered by two hydrographic sections between Greenland and Portugal. The corresponding cruises were carr...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | https://hal.science/hal-00581670 https://doi.org/10.1016/j.dsr.2010.07.009 |
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ftsorbonneuniv:oai:HAL:hal-00581670v1 2024-09-15T18:04:23+00:00 The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 Lherminier, Pascale Mercier, Herlé Huck, Thierry Gourcuff, Claire Perez, Fiz F. Morin, Pascal Sarafanov, Artem Falina, Anastasia Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Instituto de Investigaciones Marinas (CSIC) Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC) Adaptation et diversité en milieu marin (AD2M) Station biologique de Roscoff Roscoff (SBR) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) P.P. Shirshov Institute of Oceanology (SIO) Russian Academy of Sciences Moscow (RAS) 2010 https://hal.science/hal-00581670 https://doi.org/10.1016/j.dsr.2010.07.009 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2010.07.009 hal-00581670 https://hal.science/hal-00581670 doi:10.1016/j.dsr.2010.07.009 ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-00581670 Deep Sea Research Part I: Oceanographic Research Papers, 2010, 57 (11), pp.1374-1391. ⟨10.1016/j.dsr.2010.07.009⟩ North Atlantic Subpolar gyre Meridional Overturning Circulation OVIDE Hydrology ADCP [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2010 ftsorbonneuniv https://doi.org/10.1016/j.dsr.2010.07.009 2024-07-25T23:47:34Z International audience The horizontal circulation of the subpolar gyre and the Meridional Overturning Circulation (MOC) are investigated here by comparing two snapshots of the North Atlantic as delivered by two hydrographic sections between Greenland and Portugal. The corresponding cruises were carried out in June-July 2002 and June-July 2004 on R/V Thalassa within the framework of the Ovide project. The absolute transports in June 2004 are described in detail, and then compared with transports in June 2002. The MOC (in density coordinates), driven by the volume balance between the northward North Atlantic Current (NAC) and the net southward export of dense water from the subpolar gyre, did not change: MOCσ=16.3±2.4 Sv (1 Sv=106 m3 s−1). Its upper limb, above σ1=32.1, is decomposed into two main branches, the Eastern NAC (ENAC) and the Western NAC (WNAC), that transport about 8 Sv each. In the lower limb of the MOC, we find a 4-5 Sv increase in the cyclonic circulation of the subpolar gyre between June 2002 and 2004, affecting mainly the intermediate water without changing the MOCσ amplitude. Accordingly, the 14±2 Sv transport over Reykjanes Ridge in June 2004 (between 58°50′N and Iceland) is estimated to have been 4-5 Sv stronger than in June 2002. Sustaining this observation, a relatively warm and salty anomaly coming from the Iceland Basin was found in the East Greenland-Irminger Current (EGIC) in June 2004, along with a modified vertical structure of the transport that shows a 4-5 Sv intensification of the net southward flow in the corresponding layer. Overall, in June 2004, the EGIC (from the surface to σ0=27.8) is found at 23.7±1.4 Sv in June 2004, and the Deep Western Boundary Current (DWBC) below sums up to 11.2±1.7 Sv, so that the western boundary current ~5 Sv stronger than in June 2002. Article in Journal/Newspaper East Greenland Greenland Iceland north atlantic current North Atlantic HAL Sorbonne Université Deep Sea Research Part I: Oceanographic Research Papers 57 11 1374 1391 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
North Atlantic Subpolar gyre Meridional Overturning Circulation OVIDE Hydrology ADCP [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
North Atlantic Subpolar gyre Meridional Overturning Circulation OVIDE Hydrology ADCP [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Lherminier, Pascale Mercier, Herlé Huck, Thierry Gourcuff, Claire Perez, Fiz F. Morin, Pascal Sarafanov, Artem Falina, Anastasia The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
topic_facet |
North Atlantic Subpolar gyre Meridional Overturning Circulation OVIDE Hydrology ADCP [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The horizontal circulation of the subpolar gyre and the Meridional Overturning Circulation (MOC) are investigated here by comparing two snapshots of the North Atlantic as delivered by two hydrographic sections between Greenland and Portugal. The corresponding cruises were carried out in June-July 2002 and June-July 2004 on R/V Thalassa within the framework of the Ovide project. The absolute transports in June 2004 are described in detail, and then compared with transports in June 2002. The MOC (in density coordinates), driven by the volume balance between the northward North Atlantic Current (NAC) and the net southward export of dense water from the subpolar gyre, did not change: MOCσ=16.3±2.4 Sv (1 Sv=106 m3 s−1). Its upper limb, above σ1=32.1, is decomposed into two main branches, the Eastern NAC (ENAC) and the Western NAC (WNAC), that transport about 8 Sv each. In the lower limb of the MOC, we find a 4-5 Sv increase in the cyclonic circulation of the subpolar gyre between June 2002 and 2004, affecting mainly the intermediate water without changing the MOCσ amplitude. Accordingly, the 14±2 Sv transport over Reykjanes Ridge in June 2004 (between 58°50′N and Iceland) is estimated to have been 4-5 Sv stronger than in June 2002. Sustaining this observation, a relatively warm and salty anomaly coming from the Iceland Basin was found in the East Greenland-Irminger Current (EGIC) in June 2004, along with a modified vertical structure of the transport that shows a 4-5 Sv intensification of the net southward flow in the corresponding layer. Overall, in June 2004, the EGIC (from the surface to σ0=27.8) is found at 23.7±1.4 Sv in June 2004, and the Deep Western Boundary Current (DWBC) below sums up to 11.2±1.7 Sv, so that the western boundary current ~5 Sv stronger than in June 2002. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Instituto de Investigaciones Marinas (CSIC) Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC) Adaptation et diversité en milieu marin (AD2M) Station biologique de Roscoff Roscoff (SBR) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) P.P. Shirshov Institute of Oceanology (SIO) Russian Academy of Sciences Moscow (RAS) |
format |
Article in Journal/Newspaper |
author |
Lherminier, Pascale Mercier, Herlé Huck, Thierry Gourcuff, Claire Perez, Fiz F. Morin, Pascal Sarafanov, Artem Falina, Anastasia |
author_facet |
Lherminier, Pascale Mercier, Herlé Huck, Thierry Gourcuff, Claire Perez, Fiz F. Morin, Pascal Sarafanov, Artem Falina, Anastasia |
author_sort |
Lherminier, Pascale |
title |
The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
title_short |
The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
title_full |
The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
title_fullStr |
The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
title_full_unstemmed |
The Atlantic Meridional Overturning Circulation and the subpolar gyre observed at the A25-OVIDE section in June 2002 and 2004 |
title_sort |
atlantic meridional overturning circulation and the subpolar gyre observed at the a25-ovide section in june 2002 and 2004 |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00581670 https://doi.org/10.1016/j.dsr.2010.07.009 |
genre |
East Greenland Greenland Iceland north atlantic current North Atlantic |
genre_facet |
East Greenland Greenland Iceland north atlantic current North Atlantic |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-00581670 Deep Sea Research Part I: Oceanographic Research Papers, 2010, 57 (11), pp.1374-1391. ⟨10.1016/j.dsr.2010.07.009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2010.07.009 hal-00581670 https://hal.science/hal-00581670 doi:10.1016/j.dsr.2010.07.009 |
op_doi |
https://doi.org/10.1016/j.dsr.2010.07.009 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
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57 |
container_issue |
11 |
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1374 |
op_container_end_page |
1391 |
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