Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña
International audience Abstract El Niño-Southern Oscillation (ENSO) is known to affect the Northern Hemisphere tropospheric circulation in late-winter (January–March), but whether El Niño and La Niña lead to symmetric impacts and with the same underlying dynamics remains unclear, particularly in the...
Published in: | Climate Dynamics |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://meteofrance.hal.science/meteo-03478112 https://meteofrance.hal.science/meteo-03478112/document https://meteofrance.hal.science/meteo-03478112/file/2020_Article_.pdf https://doi.org/10.1007/s00382-020-05415-y |
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ftutoulouse3hal:oai:HAL:meteo-03478112v1 |
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openpolar |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Mezzina, Bianca García-Serrano, Javier Bladé, Ileana Palmeiro, Froila Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Abstract El Niño-Southern Oscillation (ENSO) is known to affect the Northern Hemisphere tropospheric circulation in late-winter (January–March), but whether El Niño and La Niña lead to symmetric impacts and with the same underlying dynamics remains unclear, particularly in the North Atlantic. Three state-of-the-art atmospheric models forced by symmetric anomalous sea surface temperature (SST) patterns, mimicking strong ENSO events, are used to robustly diagnose symmetries and asymmetries in the extra-tropical ENSO response. Asymmetries arise in the sea-level pressure (SLP) response over the North Pacific and North Atlantic, as the response to La Niña tends to be weaker and shifted westward with respect to that of El Niño. The difference in amplitude can be traced back to the distinct energy available for the two ENSO phases associated with the non-linear diabatic heating response to the total SST field. The longitudinal shift is embedded into the large-scale Rossby wave train triggered from the tropical Pacific, as its anomalies in the upper troposphere show a similar westward displacement in La Niña compared to El Niño. To fully explain this shift, the response in tropical convection and the related anomalous upper-level divergence have to be considered together with the climatological vorticity gradient of the subtropical jet, i.e. diagnosing the tropical Rossby wave source. In the North Atlantic, the ENSO-forced SLP signal is a well-known dipole between middle and high latitudes, different from the North Atlantic Oscillation, whose asymmetry is not indicative of distinct mechanisms driving the teleconnection for El Niño and La Niña. |
author2 |
Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS) Universitat de Barcelona (UB) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-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)-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-Centre National de la Recherche Scientifique (CNRS) Euro-Mediterranean Center on Climate Change (CMCC) Centro Euro-Mediterraneo per i Cambiamenti Climatici Bologna (CMCC) Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Bologna (INGV) Istituto Nazionale di Geofisica e Vulcanologia |
format |
Article in Journal/Newspaper |
author |
Mezzina, Bianca García-Serrano, Javier Bladé, Ileana Palmeiro, Froila Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio |
author_facet |
Mezzina, Bianca García-Serrano, Javier Bladé, Ileana Palmeiro, Froila Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio |
author_sort |
Mezzina, Bianca |
title |
Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
title_short |
Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
title_full |
Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
title_fullStr |
Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
title_full_unstemmed |
Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña |
title_sort |
multi-model assessment of the late-winter extra-tropical response to el niño and la niña |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://meteofrance.hal.science/meteo-03478112 https://meteofrance.hal.science/meteo-03478112/document https://meteofrance.hal.science/meteo-03478112/file/2020_Article_.pdf https://doi.org/10.1007/s00382-020-05415-y |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://meteofrance.hal.science/meteo-03478112 Climate Dynamics, 2020, ⟨10.1007/s00382-020-05415-y⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-020-05415-y meteo-03478112 https://meteofrance.hal.science/meteo-03478112 https://meteofrance.hal.science/meteo-03478112/document https://meteofrance.hal.science/meteo-03478112/file/2020_Article_.pdf doi:10.1007/s00382-020-05415-y |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00382-020-05415-y |
container_title |
Climate Dynamics |
container_volume |
58 |
container_issue |
7-8 |
container_start_page |
1965 |
op_container_end_page |
1986 |
_version_ |
1810460097661370368 |
spelling |
ftutoulouse3hal:oai:HAL:meteo-03478112v1 2024-09-15T18:21:30+00:00 Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña Mezzina, Bianca García-Serrano, Javier Bladé, Ileana Palmeiro, Froila Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS) Universitat de Barcelona (UB) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-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)-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-Centre National de la Recherche Scientifique (CNRS) Euro-Mediterranean Center on Climate Change (CMCC) Centro Euro-Mediterraneo per i Cambiamenti Climatici Bologna (CMCC) Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Bologna (INGV) Istituto Nazionale di Geofisica e Vulcanologia 2020-08-26 https://meteofrance.hal.science/meteo-03478112 https://meteofrance.hal.science/meteo-03478112/document https://meteofrance.hal.science/meteo-03478112/file/2020_Article_.pdf https://doi.org/10.1007/s00382-020-05415-y en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-020-05415-y meteo-03478112 https://meteofrance.hal.science/meteo-03478112 https://meteofrance.hal.science/meteo-03478112/document https://meteofrance.hal.science/meteo-03478112/file/2020_Article_.pdf doi:10.1007/s00382-020-05415-y http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://meteofrance.hal.science/meteo-03478112 Climate Dynamics, 2020, ⟨10.1007/s00382-020-05415-y⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2020 ftutoulouse3hal https://doi.org/10.1007/s00382-020-05415-y 2024-06-25T00:11:19Z International audience Abstract El Niño-Southern Oscillation (ENSO) is known to affect the Northern Hemisphere tropospheric circulation in late-winter (January–March), but whether El Niño and La Niña lead to symmetric impacts and with the same underlying dynamics remains unclear, particularly in the North Atlantic. Three state-of-the-art atmospheric models forced by symmetric anomalous sea surface temperature (SST) patterns, mimicking strong ENSO events, are used to robustly diagnose symmetries and asymmetries in the extra-tropical ENSO response. Asymmetries arise in the sea-level pressure (SLP) response over the North Pacific and North Atlantic, as the response to La Niña tends to be weaker and shifted westward with respect to that of El Niño. The difference in amplitude can be traced back to the distinct energy available for the two ENSO phases associated with the non-linear diabatic heating response to the total SST field. The longitudinal shift is embedded into the large-scale Rossby wave train triggered from the tropical Pacific, as its anomalies in the upper troposphere show a similar westward displacement in La Niña compared to El Niño. To fully explain this shift, the response in tropical convection and the related anomalous upper-level divergence have to be considered together with the climatological vorticity gradient of the subtropical jet, i.e. diagnosing the tropical Rossby wave source. In the North Atlantic, the ENSO-forced SLP signal is a well-known dipole between middle and high latitudes, different from the North Atlantic Oscillation, whose asymmetry is not indicative of distinct mechanisms driving the teleconnection for El Niño and La Niña. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Université Toulouse III - Paul Sabatier: HAL-UPS Climate Dynamics 58 7-8 1965 1986 |