Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model
Numerical models are used to estimate the meridional overturning and transports along the paths of two hydrographic cruises, carried out in 1997 and 2002 from Greenland to Portugal. We have examined the influence of the different paths of the two cruises and found that it could explain 0.4 to 2 Sv o...
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Language: | English |
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Online Access: | https://hal.science/hal-00252101 https://doi.org/10.1007/s10236-006-0069-y |
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ftsorbonneuniv:oai:HAL:hal-00252101v1 2024-04-28T08:17:27+00:00 Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model Tréguier, Anne-Marie Mercier, Herlé Lherminier, Pascale Madec, Gurvan Barnier, Bernard Gourcuff, Claire Penduff, Thierry Czeschel, Lars Böning, Claus W. 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) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Birmingham, United Kingdom 2006-10-24 https://hal.science/hal-00252101 https://doi.org/10.1007/s10236-006-0069-y en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1007/s10236-006-0069-y hal-00252101 https://hal.science/hal-00252101 doi:10.1007/s10236-006-0069-y http://creativecommons.org/licenses/by/ Rapid Climate Change International Science Conference https://hal.science/hal-00252101 Rapid Climate Change International Science Conference, Oct 2006, Birmingham, United Kingdom. 1 page, ⟨10.1007/s10236-006-0069-y⟩ Oceanography Climate variability North Atlantic Thermohaline circulation Ocean model [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] info:eu-repo/semantics/conferenceObject Conference papers 2006 ftsorbonneuniv https://doi.org/10.1007/s10236-006-0069-y 2024-04-08T17:15:17Z Numerical models are used to estimate the meridional overturning and transports along the paths of two hydrographic cruises, carried out in 1997 and 2002 from Greenland to Portugal. We have examined the influence of the different paths of the two cruises and found that it could explain 0.4 to 2 Sv of difference in overturning (the precise value is model-dependent). Models show a decrease in the overturning circulation between 1997 and 2002, with different amplitudes. The CLIPPER ATL6 model reproduces well the observed weakening of the overturning in density coordinates between the cruises; in the model, the change is due to the combination of interannual and high-frequency forcing and internal variability associated with eddies and meanders. Examination of the $z$-coordinate overturning reveals model–data discrepancies: the vertical structure in the models does not change as much as the observed one. The East Greenland current variability is mainly wind-forced in the ATL6 model, while fluctuations due to eddies and instabilities explain a large part of the North Atlantic Current variability. The time-residual transport of dense water and heat due to eddy correlations between currents and properties is small across this section, which is normal to the direction of the main current. Conference Object East Greenland east greenland current Greenland north atlantic current North Atlantic North atlantic Thermohaline circulation HAL Sorbonne Université Ocean Dynamics 56 5-6 568 580 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Oceanography Climate variability North Atlantic Thermohaline circulation Ocean model [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
spellingShingle |
Oceanography Climate variability North Atlantic Thermohaline circulation Ocean model [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Tréguier, Anne-Marie Mercier, Herlé Lherminier, Pascale Madec, Gurvan Barnier, Bernard Gourcuff, Claire Penduff, Thierry Czeschel, Lars Böning, Claus W. Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
topic_facet |
Oceanography Climate variability North Atlantic Thermohaline circulation Ocean model [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
description |
Numerical models are used to estimate the meridional overturning and transports along the paths of two hydrographic cruises, carried out in 1997 and 2002 from Greenland to Portugal. We have examined the influence of the different paths of the two cruises and found that it could explain 0.4 to 2 Sv of difference in overturning (the precise value is model-dependent). Models show a decrease in the overturning circulation between 1997 and 2002, with different amplitudes. The CLIPPER ATL6 model reproduces well the observed weakening of the overturning in density coordinates between the cruises; in the model, the change is due to the combination of interannual and high-frequency forcing and internal variability associated with eddies and meanders. Examination of the $z$-coordinate overturning reveals model–data discrepancies: the vertical structure in the models does not change as much as the observed one. The East Greenland current variability is mainly wind-forced in the ATL6 model, while fluctuations due to eddies and instabilities explain a large part of the North Atlantic Current variability. The time-residual transport of dense water and heat due to eddy correlations between currents and properties is small across this section, which is normal to the direction of the main current. |
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) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Tréguier, Anne-Marie Mercier, Herlé Lherminier, Pascale Madec, Gurvan Barnier, Bernard Gourcuff, Claire Penduff, Thierry Czeschel, Lars Böning, Claus W. |
author_facet |
Tréguier, Anne-Marie Mercier, Herlé Lherminier, Pascale Madec, Gurvan Barnier, Bernard Gourcuff, Claire Penduff, Thierry Czeschel, Lars Böning, Claus W. |
author_sort |
Tréguier, Anne-Marie |
title |
Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
title_short |
Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
title_full |
Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
title_fullStr |
Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
title_full_unstemmed |
Internal and forced variability along a section between Greenland and Portugal in the Clipper Atlantic model |
title_sort |
internal and forced variability along a section between greenland and portugal in the clipper atlantic model |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00252101 https://doi.org/10.1007/s10236-006-0069-y |
op_coverage |
Birmingham, United Kingdom |
genre |
East Greenland east greenland current Greenland north atlantic current North Atlantic North atlantic Thermohaline circulation |
genre_facet |
East Greenland east greenland current Greenland north atlantic current North Atlantic North atlantic Thermohaline circulation |
op_source |
Rapid Climate Change International Science Conference https://hal.science/hal-00252101 Rapid Climate Change International Science Conference, Oct 2006, Birmingham, United Kingdom. 1 page, ⟨10.1007/s10236-006-0069-y⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10236-006-0069-y hal-00252101 https://hal.science/hal-00252101 doi:10.1007/s10236-006-0069-y |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1007/s10236-006-0069-y |
container_title |
Ocean Dynamics |
container_volume |
56 |
container_issue |
5-6 |
container_start_page |
568 |
op_container_end_page |
580 |
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1797582033450434560 |