Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña

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-...

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Autores: Mezzina, Bianca, García-Serrano, Javier, 1980-, Bladé, Ileana, Palmeiro Núñez, Froila, Batté, Lauriane, Ardilouze, Constantin, Benassi, Marianna, Gualdi, Silvio
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2020
País:España
Recursos:Universidad de Barcelona
Repositório:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/170977
Acesso em linha:https://hdl.handle.net/2445/170977
Access Level:Acceso aberto
Palavra-chave:Corrent del Niño
Precipitacions (Meteorologia)
El Niño Current
Precipitations (Meteorology)
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spelling Multi-model assessment of the late-winter extra-tropical response to El Niño and La NiñaMezzina, BiancaGarcía-Serrano, Javier, 1980-Bladé, IleanaPalmeiro Núñez, FroilaBatté, LaurianeArdilouze, ConstantinBenassi, MariannaGualdi, SilvioCorrent del NiñoPrecipitacions (Meteorologia)El Niño CurrentPrecipitations (Meteorology)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.Springer Verlag2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/170977Articles publicats en revistes (Física Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1007/s00382-020-05415-yClimate Dynamics, 2020https://doi.org/10.1007/s00382-020-05415-yinfo:eu-repo/grantAgreement/EC/H2020/690462cc by (c) Mezzina et al., 2020http://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1709772026-05-27T06:46:51Z
dc.title.none.fl_str_mv Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña
title Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña
spellingShingle Multi-model assessment of the late-winter extra-tropical response to El Niño and La Niña
Mezzina, Bianca
Corrent del Niño
Precipitacions (Meteorologia)
El Niño Current
Precipitations (Meteorology)
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
dc.creator.none.fl_str_mv Mezzina, Bianca
García-Serrano, Javier, 1980-
Bladé, Ileana
Palmeiro Núñez, Froila
Batté, Lauriane
Ardilouze, Constantin
Benassi, Marianna
Gualdi, Silvio
author Mezzina, Bianca
author_facet Mezzina, Bianca
García-Serrano, Javier, 1980-
Bladé, Ileana
Palmeiro Núñez, Froila
Batté, Lauriane
Ardilouze, Constantin
Benassi, Marianna
Gualdi, Silvio
author_role author
author2 García-Serrano, Javier, 1980-
Bladé, Ileana
Palmeiro Núñez, Froila
Batté, Lauriane
Ardilouze, Constantin
Benassi, Marianna
Gualdi, Silvio
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Corrent del Niño
Precipitacions (Meteorologia)
El Niño Current
Precipitations (Meteorology)
topic Corrent del Niño
Precipitacions (Meteorologia)
El Niño Current
Precipitations (Meteorology)
description 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.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/170977
url https://hdl.handle.net/2445/170977
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1007/s00382-020-05415-y
Climate Dynamics, 2020
https://doi.org/10.1007/s00382-020-05415-y
info:eu-repo/grantAgreement/EC/H2020/690462
dc.rights.none.fl_str_mv cc by (c) Mezzina et al., 2020
http://creativecommons.org/licenses/by/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc by (c) Mezzina et al., 2020
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
dc.source.none.fl_str_mv Articles publicats en revistes (Física Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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