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CR 43:215-228 (2010)  -  DOI:

Precipitation trends in Spanish hydrological divisions, 1946–2005

José Carlos Gonzalez-Hidalgo1,2,*, Michele Brunetti1, Martin de Luis

1ISAC-CNR, Via Gobetti 1001, Bologna, Italy
2Department of Geography, University of Zaragoza, Plaza San Francisco sn. 50009, Zaragoza, Spain

ABSTRACT: This paper presents an analysis of precipitation changes in the main Hydrological Divisions (HDs; ‘Cuencas Hidrográficas’, Water Planning Divisions) in Spain from 1946–2005. Trend analysis revealed several monthly long-term variations and important spatial differences that should be taken into account for any national water-planning scheme. The most spatially coherent signals were a negative trend observed in March and June, affecting all catchments (HDs), and a positive trend in October, which was particularly evident in the northwestern catchments. These caused a redistribution of precipitation throughout the year, with a reduction in the length of the wet season (due to the negative trend in March) and a concentration of precipitation at the beginning of the wet season in October. A running trend analysis revealed variability in the long-term tendency which, although quite persistent, changed in strength between sub-periods.

KEY WORDS: Precipitation trend . Running trend . Hydrological Divisions . Water Planning . Spain

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Cite this article as: Gonzalez-Hidalgo JC, Brunetti M, de Luis M (2010) Precipitation trends in Spanish hydrological divisions, 1946–2005. Clim Res 43:215-228.

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