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Trends in Precipitation Concentration and Extremes in the Mediterranean Penedès-Anoia Region, Ne Spain

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Abstract

The high variability of the Mediterranean climate from year to year and within each year makes it difficult to assess changes that could be associated with a climate change. In this paper some indices, such as changes in the precipitation concentration during the year, maximum 1-day and 5-day precipitation, number of wet days (total and those with precipitation higher than the 75th and 95th percentile), magnitude and frequency of extreme events (considered as the rainfall higher than that corresponding to the 99th percentile), fraction of annual total precipitation due to events exceeding the 95th and 99th percentile, strength of the events, and length and frequency of dry period (days between consecutive rains) are evaluated for the Penedès-Anoia region (NE Spain). A 80-year daily dataset (1923–2002) and two 40-year series were used to assess possible trends. The indices indicate an increase in precipitation in winter and summer and a positive trend of concentration in autumn, with a higher number of extreme events separated by longer dry periods. The total number of wet days per year increased, although it was irregularly distributed over the year, with an increase in the extremes and in the fraction of total rainfall that these events represent in autumn and winter, and with an increase of the strength of the events in autumn. These changes in rainfall distribution have negative effects on water availability for crops and contribute to accelerate erosion processes in the area.

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Authors and Affiliations

  1. Department of Environment and Soil Science, University of Lleida, Alcalde Rovira Roure 191, 25198, Lleida, Spain

    M. C. Ramos & J. A. Martínez-Casasnovas

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  1. M. C. Ramos
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  2. J. A. Martínez-Casasnovas
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Correspondence to M. C. Ramos.

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Ramos, M.C., Martínez-Casasnovas, J.A. Trends in Precipitation Concentration and Extremes in the Mediterranean Penedès-Anoia Region, Ne Spain. Climatic Change 74, 457–474 (2006). https://doi.org/10.1007/s10584-006-3458-9

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  • DOI: https://doi.org/10.1007/s10584-006-3458-9

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