Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic
International audience Understanding the preferential timescales of variability in the North Atlantic, usually associated with the Atlantic meridional overturning circulation (AMOC), is essential for the prospects for decadal prediction. However, the wide variety of mechanisms proposed from the anal...
Published in: | Progress in Oceanography |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201/document https://hal.sorbonne-universite.fr/hal-01176201/file/Ortega_Reconciling_two.pdf https://doi.org/10.1016/j.pocean.2015.06.009 |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Ortega, Pablo Mignot, Juliette Swingedouw, Didier Sévellec, Florian Guilyardi, Éric Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Understanding the preferential timescales of variability in the North Atlantic, usually associated with the Atlantic meridional overturning circulation (AMOC), is essential for the prospects for decadal prediction. However, the wide variety of mechanisms proposed from the analysis of climate simulations, potentially dependent on the models themselves, has stimulated the debate of which processes take place in reality. One mechanism receiving increasing attention, identified both in idealized models and observations, is a westward propagation of subsurface buoyancy anomalies that impact the AMOC through a basin-scale intensification of the zonal density gradient, enhancing the northward transport via thermal wind balance. In this study, we revisit a control simulation from the Institut Pierre-Simon Laplace Coupled Model 5A (IPSL-CM5A), characterized by a strong AMOC periodicity at 20 years, previously explained by an upper ocean–atmosphere–sea ice coupled mode driving convection activity south of Iceland. Our study shows that this mechanism interacts constructively with the basin-wide propagation in the subsurface. This constructive feedback may explain why bi-decadal variability is so intense in this coupled model as compared to others. |
author2 |
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) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Processus de la variabilité climatique tropicale et impacts (PARVATI) 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)-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)) Oeschger Centre for Climate Change Research (OCCR) Universität Bern / University of Bern (UNIBE) Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) NCAS-Climate Reading Department of Meteorology Reading University of Reading (UOR)-University of Reading (UOR) Natural and Environmental Research Council UK (MESO-CLIP, NE/K005928/1) ANR-13-SENV-0002,MORDICUS,Oscillations et rétroactions climatiques aux échelles décennales : mécanismes, sensibilité et incertitudes(2013) European Project: 308378,EC:FP7:ENV,FP7-ENV-2012-two-stage,SPECS(2012) |
format |
Article in Journal/Newspaper |
author |
Ortega, Pablo Mignot, Juliette Swingedouw, Didier Sévellec, Florian Guilyardi, Éric |
author_facet |
Ortega, Pablo Mignot, Juliette Swingedouw, Didier Sévellec, Florian Guilyardi, Éric |
author_sort |
Ortega, Pablo |
title |
Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
title_short |
Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
title_full |
Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
title_fullStr |
Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
title_full_unstemmed |
Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic |
title_sort |
reconciling two alternative mechanisms behind bi-decadal variability in the north atlantic |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.sorbonne-universite.fr/hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201/document https://hal.sorbonne-universite.fr/hal-01176201/file/Ortega_Reconciling_two.pdf https://doi.org/10.1016/j.pocean.2015.06.009 |
genre |
Iceland North Atlantic Sea ice |
genre_facet |
Iceland North Atlantic Sea ice |
op_source |
ISSN: 0079-6611 Progress in Oceanography https://hal.sorbonne-universite.fr/hal-01176201 Progress in Oceanography, 2015, 137 (Part A), pp.237-249. ⟨10.1016/j.pocean.2015.06.009⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pocean.2015.06.009 info:eu-repo/grantAgreement/EC/FP7/308378/EU/Seasonal-to-decadal climate Prediction for the improvement of EuropeanClimate Services/SPECS hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201/document https://hal.sorbonne-universite.fr/hal-01176201/file/Ortega_Reconciling_two.pdf doi:10.1016/j.pocean.2015.06.009 IRD: fdi:010065359 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2015.06.009 |
container_title |
Progress in Oceanography |
container_volume |
137 |
container_start_page |
237 |
op_container_end_page |
249 |
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spelling |
ftceafr:oai:HAL:hal-01176201v1 2024-05-19T07:42:50+00:00 Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic Ortega, Pablo Mignot, Juliette Swingedouw, Didier Sévellec, Florian Guilyardi, Éric 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) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Processus de la variabilité climatique tropicale et impacts (PARVATI) 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)-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)) Oeschger Centre for Climate Change Research (OCCR) Universität Bern / University of Bern (UNIBE) Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) NCAS-Climate Reading Department of Meteorology Reading University of Reading (UOR)-University of Reading (UOR) Natural and Environmental Research Council UK (MESO-CLIP, NE/K005928/1) ANR-13-SENV-0002,MORDICUS,Oscillations et rétroactions climatiques aux échelles décennales : mécanismes, sensibilité et incertitudes(2013) European Project: 308378,EC:FP7:ENV,FP7-ENV-2012-two-stage,SPECS(2012) 2015-09 https://hal.sorbonne-universite.fr/hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201/document https://hal.sorbonne-universite.fr/hal-01176201/file/Ortega_Reconciling_two.pdf https://doi.org/10.1016/j.pocean.2015.06.009 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pocean.2015.06.009 info:eu-repo/grantAgreement/EC/FP7/308378/EU/Seasonal-to-decadal climate Prediction for the improvement of EuropeanClimate Services/SPECS hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201 https://hal.sorbonne-universite.fr/hal-01176201/document https://hal.sorbonne-universite.fr/hal-01176201/file/Ortega_Reconciling_two.pdf doi:10.1016/j.pocean.2015.06.009 IRD: fdi:010065359 info:eu-repo/semantics/OpenAccess ISSN: 0079-6611 Progress in Oceanography https://hal.sorbonne-universite.fr/hal-01176201 Progress in Oceanography, 2015, 137 (Part A), pp.237-249. ⟨10.1016/j.pocean.2015.06.009⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2015 ftceafr https://doi.org/10.1016/j.pocean.2015.06.009 2024-04-25T02:08:29Z International audience Understanding the preferential timescales of variability in the North Atlantic, usually associated with the Atlantic meridional overturning circulation (AMOC), is essential for the prospects for decadal prediction. However, the wide variety of mechanisms proposed from the analysis of climate simulations, potentially dependent on the models themselves, has stimulated the debate of which processes take place in reality. One mechanism receiving increasing attention, identified both in idealized models and observations, is a westward propagation of subsurface buoyancy anomalies that impact the AMOC through a basin-scale intensification of the zonal density gradient, enhancing the northward transport via thermal wind balance. In this study, we revisit a control simulation from the Institut Pierre-Simon Laplace Coupled Model 5A (IPSL-CM5A), characterized by a strong AMOC periodicity at 20 years, previously explained by an upper ocean–atmosphere–sea ice coupled mode driving convection activity south of Iceland. Our study shows that this mechanism interacts constructively with the basin-wide propagation in the subsurface. This constructive feedback may explain why bi-decadal variability is so intense in this coupled model as compared to others. Article in Journal/Newspaper Iceland North Atlantic Sea ice HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Progress in Oceanography 137 237 249 |