Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches
ABSTRACT March monthly accumulated precipitation in the central and western regions of the Iberian Peninsula presents a clear continuous decline of 50% during the 1960-97 period. A finer analysis using daily data reveals that this trend is exactly confined to the month of March. However, this is mer...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1060.2209 2023-05-15T17:28:25+02:00 Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches Daniel Paredes Ricardo M Trigo Ricardo Garcia-Herrera Isabel Franco Trigo The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1060.2209 http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1060.2209 http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf text ftciteseerx 2020-04-19T00:17:27Z ABSTRACT March monthly accumulated precipitation in the central and western regions of the Iberian Peninsula presents a clear continuous decline of 50% during the 1960-97 period. A finer analysis using daily data reveals that this trend is exactly confined to the month of March. However, this is merely the most visible aspect of a larger phenomenon over the North Atlantic/European sector. The European precipitation trends in March for the period 1960-2000 show a clear distribution of increasing precipitation in the northern regions (the British Isles and parts of Scandinavia) together with decreasing trends throughout the western Mediterranean Basin. Relevant circulation changes over the North Atlantic and European sectors explain these precipitation trends. First, a regional Eulerian approach by means of a weather-type (WT) classification shows that the major rainfall contributors in March display significantly decreasing frequencies for the Iberian Peninsula, in contrast to the corresponding "wet" weather types for the U.K./Ireland sector, which display increasing frequencies. Within a larger context, a Lagrangian approach, based on the analysis of storm tracks over Europe and the North Atlantic region, reveals dramatic changes in the location of cyclones in the last four decades that coincide with the corresponding precipitation trends in Europe. The North Atlantic Oscillation is suggested to be the most important large-scale factor controlling both the circulation changes and the precipitation trends over the Euro-Atlantic area in March. Finally, the potential impact of reduced precipitation for rivers and water resources in the Iberian Peninsula is considered. Text North Atlantic North Atlantic oscillation Unknown |
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English |
description |
ABSTRACT March monthly accumulated precipitation in the central and western regions of the Iberian Peninsula presents a clear continuous decline of 50% during the 1960-97 period. A finer analysis using daily data reveals that this trend is exactly confined to the month of March. However, this is merely the most visible aspect of a larger phenomenon over the North Atlantic/European sector. The European precipitation trends in March for the period 1960-2000 show a clear distribution of increasing precipitation in the northern regions (the British Isles and parts of Scandinavia) together with decreasing trends throughout the western Mediterranean Basin. Relevant circulation changes over the North Atlantic and European sectors explain these precipitation trends. First, a regional Eulerian approach by means of a weather-type (WT) classification shows that the major rainfall contributors in March display significantly decreasing frequencies for the Iberian Peninsula, in contrast to the corresponding "wet" weather types for the U.K./Ireland sector, which display increasing frequencies. Within a larger context, a Lagrangian approach, based on the analysis of storm tracks over Europe and the North Atlantic region, reveals dramatic changes in the location of cyclones in the last four decades that coincide with the corresponding precipitation trends in Europe. The North Atlantic Oscillation is suggested to be the most important large-scale factor controlling both the circulation changes and the precipitation trends over the Euro-Atlantic area in March. Finally, the potential impact of reduced precipitation for rivers and water resources in the Iberian Peninsula is considered. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Daniel Paredes Ricardo M Trigo Ricardo Garcia-Herrera Isabel Franco Trigo |
spellingShingle |
Daniel Paredes Ricardo M Trigo Ricardo Garcia-Herrera Isabel Franco Trigo Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
author_facet |
Daniel Paredes Ricardo M Trigo Ricardo Garcia-Herrera Isabel Franco Trigo |
author_sort |
Daniel Paredes |
title |
Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
title_short |
Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
title_full |
Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
title_fullStr |
Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
title_full_unstemmed |
Understanding precipitation changes in Iberia in early spring: Weather typing and storm-tracking approaches |
title_sort |
understanding precipitation changes in iberia in early spring: weather typing and storm-tracking approaches |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1060.2209 http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1060.2209 http://www.stream-ucm.es/PDF%20PUBLICACIONES/Ricardo/paredes_et_al.2006.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766121065813114880 |