Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model
International audience Spatial and temporal structures of interannual-to-decadal variability in the tropical Pacific Ocean are investigated using results from a global atmosphere-ocean coupled general circulation model. The model produces quite realistic mean state characteristics, despite a sea sur...
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ftutoulouse3hal:oai:HAL:hal-00280331v1 2024-09-15T18:28:58+00:00 Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model Cibot, Carole Maisonnave, Eric Terray, Laurent Dewitte, Boris Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Echanges Côte-Large (ECOLA) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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)-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) 2005 https://hal.science/hal-00280331 https://doi.org/10.1007/s00382-004-0513-y en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-004-0513-y hal-00280331 https://hal.science/hal-00280331 doi:10.1007/s00382-004-0513-y ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00280331 Climate Dynamics, 2005, 24 (Issue 7-8), pp.823-842. ⟨10.1007/s00382-004-0513-y⟩ info:eu-repo/semantics/article Journal articles 2005 ftutoulouse3hal https://doi.org/10.1007/s00382-004-0513-y 2024-06-25T00:15:26Z International audience Spatial and temporal structures of interannual-to-decadal variability in the tropical Pacific Ocean are investigated using results from a global atmosphere-ocean coupled general circulation model. The model produces quite realistic mean state characteristics, despite a sea surface temperature cold bias and a thermocline that is shallower than observations in the western Pacific. The periodicity and spatial patterns of the modelled El Niño Southern Oscillations (ENSO) compare well with those observed over the last 100 years, although the quasi-biennial timescale is dominant. Lag-regression analysis between the mean zonal wind stress and the 20°C isotherm depth suggests that the recently proposed recharge-oscillator paradigm is operating in the model. Decadal thermocline variability is characterized by enhanced variance over the western tropical South Pacific (~7°S). The associated subsurface temperature variability is primarily due to adiabatic displacements of the thermocline as a whole, arising from Ekman pumping anomalies located in the central Pacific, south of the equator. Related wind anomalies appear to be caused by SST anomalies in the eastern equatorial Pacific. This quasi-decadal variability has a timescale between 8 years and 20 years. The relationship between this decadal tropical mode and the low-frequency modulation of ENSO variance is also discussed. Results question the commonly accepted hypothesis that the low-frequency modulation of ENSO is due to decadal changes of the mean state characteristics. Article in Journal/Newspaper Orca Université Toulouse III - Paul Sabatier: HAL-UPS Climate Dynamics 24 7-8 823 842 |
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Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
description |
International audience Spatial and temporal structures of interannual-to-decadal variability in the tropical Pacific Ocean are investigated using results from a global atmosphere-ocean coupled general circulation model. The model produces quite realistic mean state characteristics, despite a sea surface temperature cold bias and a thermocline that is shallower than observations in the western Pacific. The periodicity and spatial patterns of the modelled El Niño Southern Oscillations (ENSO) compare well with those observed over the last 100 years, although the quasi-biennial timescale is dominant. Lag-regression analysis between the mean zonal wind stress and the 20°C isotherm depth suggests that the recently proposed recharge-oscillator paradigm is operating in the model. Decadal thermocline variability is characterized by enhanced variance over the western tropical South Pacific (~7°S). The associated subsurface temperature variability is primarily due to adiabatic displacements of the thermocline as a whole, arising from Ekman pumping anomalies located in the central Pacific, south of the equator. Related wind anomalies appear to be caused by SST anomalies in the eastern equatorial Pacific. This quasi-decadal variability has a timescale between 8 years and 20 years. The relationship between this decadal tropical mode and the low-frequency modulation of ENSO variance is also discussed. Results question the commonly accepted hypothesis that the low-frequency modulation of ENSO is due to decadal changes of the mean state characteristics. |
author2 |
Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Echanges Côte-Large (ECOLA) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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)-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 |
Article in Journal/Newspaper |
author |
Cibot, Carole Maisonnave, Eric Terray, Laurent Dewitte, Boris |
spellingShingle |
Cibot, Carole Maisonnave, Eric Terray, Laurent Dewitte, Boris Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
author_facet |
Cibot, Carole Maisonnave, Eric Terray, Laurent Dewitte, Boris |
author_sort |
Cibot, Carole |
title |
Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
title_short |
Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
title_full |
Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
title_fullStr |
Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
title_full_unstemmed |
Mechanisms of tropical Pacific interannual-to-decadal variability in the ARPEGE/ORCA global coupled model |
title_sort |
mechanisms of tropical pacific interannual-to-decadal variability in the arpege/orca global coupled model |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00280331 https://doi.org/10.1007/s00382-004-0513-y |
genre |
Orca |
genre_facet |
Orca |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00280331 Climate Dynamics, 2005, 24 (Issue 7-8), pp.823-842. ⟨10.1007/s00382-004-0513-y⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-004-0513-y hal-00280331 https://hal.science/hal-00280331 doi:10.1007/s00382-004-0513-y |
op_doi |
https://doi.org/10.1007/s00382-004-0513-y |
container_title |
Climate Dynamics |
container_volume |
24 |
container_issue |
7-8 |
container_start_page |
823 |
op_container_end_page |
842 |
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1810470387521159168 |