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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ftubarcepubl:oai:diposit.ub.edu:2445/170977 2024-02-11T10:06:08+01:00 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 M. Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio 2020-10-01T13:21:13Z 22 p. application/pdf http://hdl.handle.net/2445/170977 eng eng Springer Verlag Reproducció del document publicat a: https://doi.org/10.1007/s00382-020-05415-y Climate Dynamics, 2020 Articles publicats en revistes (Física Aplicada) https://doi.org/10.1007/s00382-020-05415-y info:eu-repo/grantAgreement/EC/H2020/690462/EU//ERA4CS 0930-7575 http://hdl.handle.net/2445/170977 703024 cc by (c) Mezzina et al., 2020 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Corrent del Niño Precipitacions (Meteorologia) El Niño Current Precipitations (Meteorology) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftubarcepubl https://doi.org/10.1007/s00382-020-05415-y 2024-01-24T01:13:05Z 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 Dipòsit Digital de la Universitat de Barcelona Pacific Climate Dynamics |
institution |
Open Polar |
collection |
Dipòsit Digital de la Universitat de Barcelona |
op_collection_id |
ftubarcepubl |
language |
English |
topic |
Corrent del Niño Precipitacions (Meteorologia) El Niño Current Precipitations (Meteorology) |
spellingShingle |
Corrent del Niño Precipitacions (Meteorologia) El Niño Current Precipitations (Meteorology) Mezzina, Bianca García Serrano, Javier Bladé, Ileana Palmeiro, Froila M. 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 |
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. |
format |
Article in Journal/Newspaper |
author |
Mezzina, Bianca García Serrano, Javier Bladé, Ileana Palmeiro, Froila M. Batté, Lauriane Ardilouze, Constantin Benassi, Marianna Gualdi, Silvio |
author_facet |
Mezzina, Bianca García Serrano, Javier Bladé, Ileana Palmeiro, Froila M. 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 |
Springer Verlag |
publishDate |
2020 |
url |
http://hdl.handle.net/2445/170977 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Reproducció del document publicat a: https://doi.org/10.1007/s00382-020-05415-y Climate Dynamics, 2020 Articles publicats en revistes (Física Aplicada) https://doi.org/10.1007/s00382-020-05415-y info:eu-repo/grantAgreement/EC/H2020/690462/EU//ERA4CS 0930-7575 http://hdl.handle.net/2445/170977 703024 |
op_rights |
cc by (c) Mezzina et al., 2020 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00382-020-05415-y |
container_title |
Climate Dynamics |
_version_ |
1790603654082854912 |