Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region
The El Niño-Southern Oscillation (ENSO) is a natural mode of climate variability in the tropical Pacific, which not only perturbs the local atmosphere, but whose impacts can also reach remote, extra-tropical regions through atmospheric teleconnections. While the atmospheric response to ENSO and the...
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ftubarcelona:oai:www.tdx.cat:10803/673236 2023-12-24T10:22:58+01:00 Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region Mezzina, Bianca García Serrano, Javier Bladé, Ileana Manrique Oliva, Alberto Universitat de Barcelona. Facultat de Física 2021-11-30 application/pdf 131 p. http://hdl.handle.net/10803/673236 eng eng Universitat de Barcelona http://hdl.handle.net/10803/673236 L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess TDX (Tesis Doctorals en Xarxa) Climatologia Climatología Climatology Corrent del Niño Corriente del Niño El Niño Current Geomorfologia climàtica Geomorfología climática Climatic geomorphology Canvi climàtic Cambio climático Climatic change Interacció oceà-atmosfera Interacción océano-atmósfera Ocean-atmosphere interaction Ciències Experimentals i Matemàtiques 53 info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2021 ftubarcelona 2023-11-30T06:33:43Z The El Niño-Southern Oscillation (ENSO) is a natural mode of climate variability in the tropical Pacific, which not only perturbs the local atmosphere, but whose impacts can also reach remote, extra-tropical regions through atmospheric teleconnections. While the atmospheric response to ENSO and the dynamics of its teleconnections are well assessed in certain locations, such as the North Pacific-American sector, it is not the case for the North Atlantic-European (NAE) sector. In this thesis, the dynamics of the ENSO-NAE teleconnection are assessed in late winter (January-March), the season in which a significant and robust ENSO-related signal has been reported in the literature. Part of this well-known late-winter ENSO signal is a sea-level pressure (SLP) dipole in the North Atlantic. In this thesis, it is assessed that this “canonical” dipole is mostly driven by tropospheric dynamics and is related to the large-scale Rossby wave train triggered from the tropical Pacific by the anomalous upper-level divergence associated with ENSO. The “canonical” SLP dipole is known to be reminiscent of the surface signature of the North Atlantic Oscillation (NAO), which is the dominant mode of variability in the North Atlantic. The relationship between the ENSO-forced response in the NAE region and the NAO is examined: it is found that no further similarities are evident apart from the surface SLP signature, and it is suggested that ENSO and the NAO are largely unrelated. Another issue tackled in this thesis is the (a)symmetry of the atmospheric signal associated with the two phases of ENSO, El Niño and La Niña, which show roughly opposite patterns of sea surface temperature (SST) anomalies in the tropical Pacific but not necessarily a symmetric atmospheric response. It is noticed that, in a set of sensitivity experiments with three state-of-the-art models, the extra-tropical response in the troposphere is slightly asymmetric in amplitude and longitudinal location. However, it is highlighted that the mechanisms at play, in ... Doctoral or Postdoctoral Thesis North Atlantic North Atlantic oscillation Universitat de Barcelona: Theses and Dissertations Online (TDX) Pacific |
institution |
Open Polar |
collection |
Universitat de Barcelona: Theses and Dissertations Online (TDX) |
op_collection_id |
ftubarcelona |
language |
English |
topic |
Climatologia Climatología Climatology Corrent del Niño Corriente del Niño El Niño Current Geomorfologia climàtica Geomorfología climática Climatic geomorphology Canvi climàtic Cambio climático Climatic change Interacció oceà-atmosfera Interacción océano-atmósfera Ocean-atmosphere interaction Ciències Experimentals i Matemàtiques 53 |
spellingShingle |
Climatologia Climatología Climatology Corrent del Niño Corriente del Niño El Niño Current Geomorfologia climàtica Geomorfología climática Climatic geomorphology Canvi climàtic Cambio climático Climatic change Interacció oceà-atmosfera Interacción océano-atmósfera Ocean-atmosphere interaction Ciències Experimentals i Matemàtiques 53 Mezzina, Bianca Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
topic_facet |
Climatologia Climatología Climatology Corrent del Niño Corriente del Niño El Niño Current Geomorfologia climàtica Geomorfología climática Climatic geomorphology Canvi climàtic Cambio climático Climatic change Interacció oceà-atmosfera Interacción océano-atmósfera Ocean-atmosphere interaction Ciències Experimentals i Matemàtiques 53 |
description |
The El Niño-Southern Oscillation (ENSO) is a natural mode of climate variability in the tropical Pacific, which not only perturbs the local atmosphere, but whose impacts can also reach remote, extra-tropical regions through atmospheric teleconnections. While the atmospheric response to ENSO and the dynamics of its teleconnections are well assessed in certain locations, such as the North Pacific-American sector, it is not the case for the North Atlantic-European (NAE) sector. In this thesis, the dynamics of the ENSO-NAE teleconnection are assessed in late winter (January-March), the season in which a significant and robust ENSO-related signal has been reported in the literature. Part of this well-known late-winter ENSO signal is a sea-level pressure (SLP) dipole in the North Atlantic. In this thesis, it is assessed that this “canonical” dipole is mostly driven by tropospheric dynamics and is related to the large-scale Rossby wave train triggered from the tropical Pacific by the anomalous upper-level divergence associated with ENSO. The “canonical” SLP dipole is known to be reminiscent of the surface signature of the North Atlantic Oscillation (NAO), which is the dominant mode of variability in the North Atlantic. The relationship between the ENSO-forced response in the NAE region and the NAO is examined: it is found that no further similarities are evident apart from the surface SLP signature, and it is suggested that ENSO and the NAO are largely unrelated. Another issue tackled in this thesis is the (a)symmetry of the atmospheric signal associated with the two phases of ENSO, El Niño and La Niña, which show roughly opposite patterns of sea surface temperature (SST) anomalies in the tropical Pacific but not necessarily a symmetric atmospheric response. It is noticed that, in a set of sensitivity experiments with three state-of-the-art models, the extra-tropical response in the troposphere is slightly asymmetric in amplitude and longitudinal location. However, it is highlighted that the mechanisms at play, in ... |
author2 |
García Serrano, Javier Bladé, Ileana Manrique Oliva, Alberto Universitat de Barcelona. Facultat de Física |
format |
Doctoral or Postdoctoral Thesis |
author |
Mezzina, Bianca |
author_facet |
Mezzina, Bianca |
author_sort |
Mezzina, Bianca |
title |
Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
title_short |
Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
title_full |
Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
title_fullStr |
Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
title_full_unstemmed |
Dynamics of the late-winter ENSO teleconnection to the North Atlantic-European region |
title_sort |
dynamics of the late-winter enso teleconnection to the north atlantic-european region |
publisher |
Universitat de Barcelona |
publishDate |
2021 |
url |
http://hdl.handle.net/10803/673236 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
TDX (Tesis Doctorals en Xarxa) |
op_relation |
http://hdl.handle.net/10803/673236 |
op_rights |
L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
_version_ |
1786196576557858816 |