deLima


Die Bodenkultur - Journal for Land Management, Food and Environment

M.I.P. de Lima, F. Espírito Santo, J.L.M.P. de Lima and A.M. Ramos:

Recent precipitation variability over 67 years in mainland Portugal

This study discusses the climatology of precipitation in mainland Portugal, aiming at the increased understanding of the potential implications of change for the hydrological regimes. It explores trends in selected specific indices that are computed from daily precipitation data of 57 measuring stations across the territory, recorded over 67 years. Results show that precipitation exhibits statistically significant decreasing trends in spring, while extremely heavy precipitation events have become more pronounced in autumn; moreover, results suggest a tendency for a reduction of duration of the rainy season. The expected consequences for the hydrological regimes and for the overall dryness conditions that normally affect large parts of the study area are analysed, especially concerning the hydrology of small basins.

Key words: Precipitation, climate variability, trends, indices, droughts.