A model study of the interannual to decadal scale variability in the North Atlantic Ocean
A forced experiment with the global version ORCA2LIM of the LODYC ocean-ice model has been carried out to simulate regional to basin scale variability in the ocean currents and the thermodynamic fields for the period 1948 to 1998. This study is part of the PREDICATE Work Package 2 (WP2) project, whi...
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ftutoulouse3hal:oai:HAL:hal-00158612v1 2024-09-15T18:17:17+00:00 A model study of the interannual to decadal scale variability in the North Atlantic Ocean Delon, Claire Terray, L. Maisonnave, E. Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Nice, France 2003-04-06 https://hal.science/hal-00158612 en eng HAL CCSD hal-00158612 https://hal.science/hal-00158612 http://creativecommons.org/licenses/by-nc/ Congrès international European Geophysical Society, American Geophysical Union https://hal.science/hal-00158612 Congrès international European Geophysical Society, American Geophysical Union, Apr 2003, Nice, France [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference papers 2003 ftutoulouse3hal 2024-06-25T00:22:00Z A forced experiment with the global version ORCA2LIM of the LODYC ocean-ice model has been carried out to simulate regional to basin scale variability in the ocean currents and the thermodynamic fields for the period 1948 to 1998. This study is part of the PREDICATE Work Package 2 (WP2) project, which purpose is to determine mechanisms of decadal fluctuations in the North Atlantic ocean. The realistic forcing fields are derived from the NCEP reanalysis using an iterative scheme (derived from the TOGA COARE scheme) for the bulk formula calculation. The thermohaline circulation (following the maximum of the meridional stream function above 20N) presents a strong jump (~5 Sv) in the early 70s, in accordance with an enhancement of the North Atlantic Oscillation some years earlier. The relationship between the THC and the atmospheric forcing (heat fluxes, wind stresses) is done through statistical methods (EOF-based methods, regression methods), in order to understand the respective roles of the atmospheric fields versus oceanic ones, like the salinity, the ice formation/dilution, and the convection. Strong variations in the thermohaline circulation are related to the mechanisms of deep-water formation in the Labrador Sea, region where the increasing salinity leads to the sinking of cold waters, the enhancement of the convection and of the thermohaline circulation. The understanding of the variability of these atmospheric and oceanic fields helps us to set up the characteristics of the simulated variability modes. Conference Object Labrador Sea North Atlantic North Atlantic oscillation Université Toulouse III - Paul Sabatier: HAL-UPS |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Delon, Claire Terray, L. Maisonnave, E. A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
A forced experiment with the global version ORCA2LIM of the LODYC ocean-ice model has been carried out to simulate regional to basin scale variability in the ocean currents and the thermodynamic fields for the period 1948 to 1998. This study is part of the PREDICATE Work Package 2 (WP2) project, which purpose is to determine mechanisms of decadal fluctuations in the North Atlantic ocean. The realistic forcing fields are derived from the NCEP reanalysis using an iterative scheme (derived from the TOGA COARE scheme) for the bulk formula calculation. The thermohaline circulation (following the maximum of the meridional stream function above 20N) presents a strong jump (~5 Sv) in the early 70s, in accordance with an enhancement of the North Atlantic Oscillation some years earlier. The relationship between the THC and the atmospheric forcing (heat fluxes, wind stresses) is done through statistical methods (EOF-based methods, regression methods), in order to understand the respective roles of the atmospheric fields versus oceanic ones, like the salinity, the ice formation/dilution, and the convection. Strong variations in the thermohaline circulation are related to the mechanisms of deep-water formation in the Labrador Sea, region where the increasing salinity leads to the sinking of cold waters, the enhancement of the convection and of the thermohaline circulation. The understanding of the variability of these atmospheric and oceanic fields helps us to set up the characteristics of the simulated variability modes. |
author2 |
Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Delon, Claire Terray, L. Maisonnave, E. |
author_facet |
Delon, Claire Terray, L. Maisonnave, E. |
author_sort |
Delon, Claire |
title |
A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
title_short |
A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
title_full |
A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
title_fullStr |
A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
title_full_unstemmed |
A model study of the interannual to decadal scale variability in the North Atlantic Ocean |
title_sort |
model study of the interannual to decadal scale variability in the north atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00158612 |
op_coverage |
Nice, France |
genre |
Labrador Sea North Atlantic North Atlantic oscillation |
genre_facet |
Labrador Sea North Atlantic North Atlantic oscillation |
op_source |
Congrès international European Geophysical Society, American Geophysical Union https://hal.science/hal-00158612 Congrès international European Geophysical Society, American Geophysical Union, Apr 2003, Nice, France |
op_relation |
hal-00158612 https://hal.science/hal-00158612 |
op_rights |
http://creativecommons.org/licenses/by-nc/ |
_version_ |
1810455305846259712 |