The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February

This paper attempts to establish a connection between stratospheric anomalies in the North Pole and rainfall on the Iberian Peninsula through the occurrence of major midwinter warmings (MMWs) and cold events (CEs), taking February as a preliminary approach. We define the MMWs as the warmings which b...

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Detalles Bibliográficos
Autores: López Bustins, Joan Albert, Esteban Vea, Pere, Labitzke, K, Langematz, Ulrike
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2007
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/122769
Acceso en línea:https://hdl.handle.net/2445/122769
Access Level:acceso abierto
Palabra clave:Climatologia
Meteorologia sinòptica
Precipitacions (Meteorologia)
Circulació atmosfèrica
Península Ibèrica
Climatology
Synoptic meteorology
Precipitations (Meteorology)
Atmospheric circulation
Iberian Peninsula
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repository_id_str
spelling The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in FebruaryLópez Bustins, Joan AlbertEsteban Vea, PereLabitzke, KLangematz, UlrikeClimatologiaMeteorologia sinòpticaPrecipitacions (Meteorologia)Circulació atmosfèricaPenínsula IbèricaClimatologySynoptic meteorologyPrecipitations (Meteorology)Atmospheric circulationIberian PeninsulaThis paper attempts to establish a connection between stratospheric anomalies in the North Pole and rainfall on the Iberian Peninsula through the occurrence of major midwinter warmings (MMWs) and cold events (CEs), taking February as a preliminary approach. We define the MMWs as the warmings which break down the polar vortex, whereas the CEs are the episodes in which the polar vortex remains cold and undisturbed. Both anomalies lead to a wind anomaly around the north polar stratosphere, which is connected with a shortly lagged tropospheric anomaly through a stratosphere-troposphere coupling in winter. A T-mode principal component analysis (PCA) was used as an objective pattern classification method for identifying the main daily surface-level pressure (SLP) patterns for February for the 1961-1990 reference period. Subsequently, those February months with an MMW or a CE influence in the troposphere are identified in the whole study period (1958-2000) by means of the Arctic Oscillation Index (AOI). Thus, performing the same analysis for the selected February months, new principal patterns for detecting changes in surface circulation structure and morphology are obtained. The results show a significant decrease in the westerlies and a southward shift of the storm tracks in Western Europe some weeks after an MMW occurrence, leading to an increase in precipitation in western Iberia and a slight decrease on the eastern Mediterranean fringe. The results are quite the opposite under a CE influence: the westerlies are strengthened and shifted northwards due to the displacement of the Atlantic anticyclone towards Central Europe; dry conditions are established throughout Iberia, except for the Mediterranean fringe, where precipitation shows a considerable increase due to the greater frequency of the northeasterly winds. Finally, an 11-year sunspot cycle-quasibiennial oscillation (QBO) modulation might be demonstrated in Iberian rainfall in February through the occurrence of these stratospheric anomalies.Elsevier Ltd2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/122769Articles publicats en revistes (Geografia)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jastp.2007.05.015Journal of Atmospheric and Solar-Terrestrial Physics, 2007, vol. 69, num. 12, p. 1471-1484https://doi.org/10.1016/j.jastp.2007.05.015(c) Elsevier Ltd, 2007info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1227692026-05-27T06:46:51Z
dc.title.none.fl_str_mv The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
title The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
spellingShingle The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
López Bustins, Joan Albert
Climatologia
Meteorologia sinòptica
Precipitacions (Meteorologia)
Circulació atmosfèrica
Península Ibèrica
Climatology
Synoptic meteorology
Precipitations (Meteorology)
Atmospheric circulation
Iberian Peninsula
title_short The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
title_full The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
title_fullStr The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
title_full_unstemmed The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
title_sort The role of the stratosphere in Iberian Peninsula rainfall: a preliminary approach in February
dc.creator.none.fl_str_mv López Bustins, Joan Albert
Esteban Vea, Pere
Labitzke, K
Langematz, Ulrike
author López Bustins, Joan Albert
author_facet López Bustins, Joan Albert
Esteban Vea, Pere
Labitzke, K
Langematz, Ulrike
author_role author
author2 Esteban Vea, Pere
Labitzke, K
Langematz, Ulrike
author2_role author
author
author
dc.subject.none.fl_str_mv Climatologia
Meteorologia sinòptica
Precipitacions (Meteorologia)
Circulació atmosfèrica
Península Ibèrica
Climatology
Synoptic meteorology
Precipitations (Meteorology)
Atmospheric circulation
Iberian Peninsula
topic Climatologia
Meteorologia sinòptica
Precipitacions (Meteorologia)
Circulació atmosfèrica
Península Ibèrica
Climatology
Synoptic meteorology
Precipitations (Meteorology)
Atmospheric circulation
Iberian Peninsula
description This paper attempts to establish a connection between stratospheric anomalies in the North Pole and rainfall on the Iberian Peninsula through the occurrence of major midwinter warmings (MMWs) and cold events (CEs), taking February as a preliminary approach. We define the MMWs as the warmings which break down the polar vortex, whereas the CEs are the episodes in which the polar vortex remains cold and undisturbed. Both anomalies lead to a wind anomaly around the north polar stratosphere, which is connected with a shortly lagged tropospheric anomaly through a stratosphere-troposphere coupling in winter. A T-mode principal component analysis (PCA) was used as an objective pattern classification method for identifying the main daily surface-level pressure (SLP) patterns for February for the 1961-1990 reference period. Subsequently, those February months with an MMW or a CE influence in the troposphere are identified in the whole study period (1958-2000) by means of the Arctic Oscillation Index (AOI). Thus, performing the same analysis for the selected February months, new principal patterns for detecting changes in surface circulation structure and morphology are obtained. The results show a significant decrease in the westerlies and a southward shift of the storm tracks in Western Europe some weeks after an MMW occurrence, leading to an increase in precipitation in western Iberia and a slight decrease on the eastern Mediterranean fringe. The results are quite the opposite under a CE influence: the westerlies are strengthened and shifted northwards due to the displacement of the Atlantic anticyclone towards Central Europe; dry conditions are established throughout Iberia, except for the Mediterranean fringe, where precipitation shows a considerable increase due to the greater frequency of the northeasterly winds. Finally, an 11-year sunspot cycle-quasibiennial oscillation (QBO) modulation might be demonstrated in Iberian rainfall in February through the occurrence of these stratospheric anomalies.
publishDate 2007
dc.date.none.fl_str_mv 2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/122769
url https://hdl.handle.net/2445/122769
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.jastp.2007.05.015
Journal of Atmospheric and Solar-Terrestrial Physics, 2007, vol. 69, num. 12, p. 1471-1484
https://doi.org/10.1016/j.jastp.2007.05.015
dc.rights.none.fl_str_mv (c) Elsevier Ltd, 2007
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier Ltd, 2007
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Geografia)
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 15.298079

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