Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)

In previous studies the Western Mediterranean Oscillation index (WeMOi) at daily resolution has proven to constitute an effective tool for analysing the occurrence of episodes of torrential precipitation over eastern Spain. The western Mediterranean region is a very sensitive area, since climate cha...

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Autores: López Bustins, Joan Albert, Arbiol Roca, Laia, Martín Vide, Javier, Barrera Escoda, Antonio, Prohom i Duran, Marc
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/178353
Acceso en línea:https://hdl.handle.net/2445/178353
Access Level:acceso abierto
Palabra clave:Precipitacions (Meteorologia)
Clima mediterrani
Canvi climàtic
Precipitations (Meteorology)
Mediterranean climate
Climatic change
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spelling Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)López Bustins, Joan AlbertArbiol Roca, LaiaMartín Vide, JavierBarrera Escoda, AntonioProhom i Duran, MarcPrecipitacions (Meteorologia)Clima mediterraniCanvi climàticPrecipitations (Meteorology)Mediterranean climateClimatic changeIn previous studies the Western Mediterranean Oscillation index (WeMOi) at daily resolution has proven to constitute an effective tool for analysing the occurrence of episodes of torrential precipitation over eastern Spain. The western Mediterranean region is a very sensitive area, since climate change can enhance these weather extremes. In the present study we created a catalogue of the extreme torrential episodes (≥200 mm in 24 h) that took place in Catalonia (NE Iberia) during the 1951-2016 study period (66 years). We computed daily WeMOi values and constructed WeMOi calendars. Our principal result reveals the occurrence of 50 episodes (0.8 cases per year), mainly concentrated in the autumn. We confirmed a threshold of WeMOi ≤ −2 to define an extreme negative WeMO phase at daily resolution. Most of the 50 episodes (60 %) in the study area occurred on days presenting an extreme negative WeMOi value. Specifically, the most negative WeMOi values are detected in autumn, from 11 to 20 October, coinciding with the highest frequency of extreme torrential events. On comparing the subperiods, we observed a statistically significant decrease in WeMOi values in all months, particularly in late October and in November and December. No changes in the frequency of these extreme torrential episodes were observed between both subperiods. In contrast, a displacement of the extreme torrential episodes is detected from early to late autumn; this can be related to a statistically significant warming of sea temperature.European Geosciences Union (EGU)2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/178353Articles publicats en revistes (Geografia)reponame:Dipòsit Digital de la UBinstname:InglésReproducció del document publicat a: https://doi.org/10.5194/nhess-20-2483-2020Natural Hazards And Earth System Sciences, 2020, vol. 20, num. 9, p. 2483-2501https://doi.org/10.5194/nhess-20-2483-2020cc-by (c) López Bustins, Joan Albert et al., 2020https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1783532025-07-25T16:43:42Z
dc.title.none.fl_str_mv Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
title Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
spellingShingle Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
López Bustins, Joan Albert
Precipitacions (Meteorologia)
Clima mediterrani
Canvi climàtic
Precipitations (Meteorology)
Mediterranean climate
Climatic change
title_short Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
title_full Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
title_fullStr Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
title_full_unstemmed Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
title_sort Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential precipitation in Catalonia (NE Iberia)
dc.creator.none.fl_str_mv López Bustins, Joan Albert
Arbiol Roca, Laia
Martín Vide, Javier
Barrera Escoda, Antonio
Prohom i Duran, Marc
author López Bustins, Joan Albert
author_facet López Bustins, Joan Albert
Arbiol Roca, Laia
Martín Vide, Javier
Barrera Escoda, Antonio
Prohom i Duran, Marc
author_role author
author2 Arbiol Roca, Laia
Martín Vide, Javier
Barrera Escoda, Antonio
Prohom i Duran, Marc
author2_role author
author
author
author
dc.subject.none.fl_str_mv Precipitacions (Meteorologia)
Clima mediterrani
Canvi climàtic
Precipitations (Meteorology)
Mediterranean climate
Climatic change
topic Precipitacions (Meteorologia)
Clima mediterrani
Canvi climàtic
Precipitations (Meteorology)
Mediterranean climate
Climatic change
description In previous studies the Western Mediterranean Oscillation index (WeMOi) at daily resolution has proven to constitute an effective tool for analysing the occurrence of episodes of torrential precipitation over eastern Spain. The western Mediterranean region is a very sensitive area, since climate change can enhance these weather extremes. In the present study we created a catalogue of the extreme torrential episodes (≥200 mm in 24 h) that took place in Catalonia (NE Iberia) during the 1951-2016 study period (66 years). We computed daily WeMOi values and constructed WeMOi calendars. Our principal result reveals the occurrence of 50 episodes (0.8 cases per year), mainly concentrated in the autumn. We confirmed a threshold of WeMOi ≤ −2 to define an extreme negative WeMO phase at daily resolution. Most of the 50 episodes (60 %) in the study area occurred on days presenting an extreme negative WeMOi value. Specifically, the most negative WeMOi values are detected in autumn, from 11 to 20 October, coinciding with the highest frequency of extreme torrential events. On comparing the subperiods, we observed a statistically significant decrease in WeMOi values in all months, particularly in late October and in November and December. No changes in the frequency of these extreme torrential episodes were observed between both subperiods. In contrast, a displacement of the extreme torrential episodes is detected from early to late autumn; this can be related to a statistically significant warming of sea temperature.
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/2445/178353
url https://hdl.handle.net/2445/178353
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/10.5194/nhess-20-2483-2020
Natural Hazards And Earth System Sciences, 2020, vol. 20, num. 9, p. 2483-2501
https://doi.org/10.5194/nhess-20-2483-2020
dc.rights.none.fl_str_mv cc-by (c) López Bustins, Joan Albert et al., 2020
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) López Bustins, Joan Albert et al., 2020
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union (EGU)
publisher.none.fl_str_mv European Geosciences Union (EGU)
dc.source.none.fl_str_mv Articles publicats en revistes (Geografia)
reponame:Dipòsit Digital de la UB
instname:
instname_str
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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