The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation
The 2004/05 hydrological year (October 2004 to September 2005) was characterized by intense dry conditions affecting most of western Europe (35 degrees-55 degrees N and 10 degrees W-10 degrees E). In Iberia the drought affected every month of this period, with the southern half of Iberia receiving r...
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ftunivcmadrid:oai:www.ucm.es:24657 2023-05-15T17:31:42+02:00 The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation García Herrera, Ricardo Hernández Martín, Emiliano Barriopedro Cepero, David Trigo, Ricardo M. Paredes, Daniel Trigo, Isabel Franco Mendes, Manuel A. 2007-06 application/pdf https://eprints.ucm.es/id/eprint/24657/ https://eprints.ucm.es/id/eprint/24657/1/barriopedro19libre.pdf https://doi.org/10.1175/JHM578.1 en eng American Meteorological Society https://eprints.ucm.es/id/eprint/24657/1/barriopedro19libre.pdf info:eu-repo/semantics/openAccess Astrofísica Astronomía Física atmosférica info:eu-repo/semantics/article PeerReviewed 2007 ftunivcmadrid https://doi.org/10.1175/JHM578.1 2022-05-12T19:56:10Z The 2004/05 hydrological year (October 2004 to September 2005) was characterized by intense dry conditions affecting most of western Europe (35 degrees-55 degrees N and 10 degrees W-10 degrees E). In Iberia the drought affected every month of this period, with the southern half of Iberia receiving roughly 40% of the usual precipitation by June 2005. Moreover, this episode stands as the driest event in the last 140 yr, producing major socioeconomic impacts particularly due to the large decrease in hydroelectricity and agricultural production in both Iberian countries (Portugal and Spain). To assess the atmospheric submonthly circulation associated with this drought an Eulerian [weather types (WTs)] and a Lagrangean (objective storm tracks) analysis were combined. There was a dramatic drop in "wet" WT frequency during winter, with less than 50% of the normal value, and a corresponding increase of "dry" WTs. The storm-track analysis reveals an impressive northward displacement of cyclone trajectories in the North Atlantic sector in winter months, resulting in an almost complete absence of cyclones crossing Iberia and western Europe. At the monthly scale, the intense drought in Iberia was due to a combination of different physical mechanisms. First, the scarce precipitation observed between November 2004 and January 2005 was associated with positive North Atlantic Oscillation (NAO) indexes for these months. In February, the East Atlantic (EA) pattern seems to be the main driver. In March neither the negative NAO (-1.8) nor the positive EA (1.1) are capable of explaining the large negative precipitation anomalies. However, it is shown that during March 2005, an intense and anomalous blocking was displaced southward of its usual location, inhibiting the occurrence of precipitation over Iberia and leading to a negative NAO index anomalously associated with low precipitation records. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Universidad Complutense de Madrid (UCM): E-Prints Complutense Journal of Hydrometeorology 8 3 483 498 |
institution |
Open Polar |
collection |
Universidad Complutense de Madrid (UCM): E-Prints Complutense |
op_collection_id |
ftunivcmadrid |
language |
English |
topic |
Astrofísica Astronomía Física atmosférica |
spellingShingle |
Astrofísica Astronomía Física atmosférica García Herrera, Ricardo Hernández Martín, Emiliano Barriopedro Cepero, David Trigo, Ricardo M. Paredes, Daniel Trigo, Isabel Franco Mendes, Manuel A. The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
topic_facet |
Astrofísica Astronomía Física atmosférica |
description |
The 2004/05 hydrological year (October 2004 to September 2005) was characterized by intense dry conditions affecting most of western Europe (35 degrees-55 degrees N and 10 degrees W-10 degrees E). In Iberia the drought affected every month of this period, with the southern half of Iberia receiving roughly 40% of the usual precipitation by June 2005. Moreover, this episode stands as the driest event in the last 140 yr, producing major socioeconomic impacts particularly due to the large decrease in hydroelectricity and agricultural production in both Iberian countries (Portugal and Spain). To assess the atmospheric submonthly circulation associated with this drought an Eulerian [weather types (WTs)] and a Lagrangean (objective storm tracks) analysis were combined. There was a dramatic drop in "wet" WT frequency during winter, with less than 50% of the normal value, and a corresponding increase of "dry" WTs. The storm-track analysis reveals an impressive northward displacement of cyclone trajectories in the North Atlantic sector in winter months, resulting in an almost complete absence of cyclones crossing Iberia and western Europe. At the monthly scale, the intense drought in Iberia was due to a combination of different physical mechanisms. First, the scarce precipitation observed between November 2004 and January 2005 was associated with positive North Atlantic Oscillation (NAO) indexes for these months. In February, the East Atlantic (EA) pattern seems to be the main driver. In March neither the negative NAO (-1.8) nor the positive EA (1.1) are capable of explaining the large negative precipitation anomalies. However, it is shown that during March 2005, an intense and anomalous blocking was displaced southward of its usual location, inhibiting the occurrence of precipitation over Iberia and leading to a negative NAO index anomalously associated with low precipitation records. |
format |
Article in Journal/Newspaper |
author |
García Herrera, Ricardo Hernández Martín, Emiliano Barriopedro Cepero, David Trigo, Ricardo M. Paredes, Daniel Trigo, Isabel Franco Mendes, Manuel A. |
author_facet |
García Herrera, Ricardo Hernández Martín, Emiliano Barriopedro Cepero, David Trigo, Ricardo M. Paredes, Daniel Trigo, Isabel Franco Mendes, Manuel A. |
author_sort |
García Herrera, Ricardo |
title |
The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
title_short |
The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
title_full |
The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
title_fullStr |
The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
title_full_unstemmed |
The outstanding 2004/05 drought in the Iberian Peninsula: associated atmospheric circulation |
title_sort |
outstanding 2004/05 drought in the iberian peninsula: associated atmospheric circulation |
publisher |
American Meteorological Society |
publishDate |
2007 |
url |
https://eprints.ucm.es/id/eprint/24657/ https://eprints.ucm.es/id/eprint/24657/1/barriopedro19libre.pdf https://doi.org/10.1175/JHM578.1 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://eprints.ucm.es/id/eprint/24657/1/barriopedro19libre.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/JHM578.1 |
container_title |
Journal of Hydrometeorology |
container_volume |
8 |
container_issue |
3 |
container_start_page |
483 |
op_container_end_page |
498 |
_version_ |
1766129390017576960 |