Resumen de The Spatial and Temporal Structure of Rainfall Trends in the Valencia Region (Eastern of Span) over the Second Half of the 20th Century
Martín de Luis Arrillaga, José Raventós Bonvehí, José Carlos González Hidalgo
Since 1995, the work group has been researching the effects of the scale of Global Change on the ecosystems in the western Mediterranean (the Valencia region of Spain). There were two main areas of interest: first the spatial and temporal structure of the rainfall trends as a part of the Global Change in the Valencia region, and second the impact that rainfall trend has on the ecosystems.
This work presents the results relating to the spatial and temporal structure of the rainfall trends in the Valencia region. We have used a daily precipitation data base composed of 97 raingauge stations which began recording from 30 to 41 years ago (Perez Cueva, 1994). All series cover at least the WMO normal period 1961-1990.
Total annual rainfall, monthly rainfall and the 10 maximum daily rainfalls per year have been studied in the context of their trends, interannual variability and spatial diversification. Trends have been analysed using the Spearman test and their spatial distribution has been analysed using a modified version of the Cramer von Mises test.
The results obtained indicate a decrease in rainfall amount between 1961-1990 associated to an increment in their variability. Autumn rainfall manifests as the main period responsible of these general results. At the daily scale, a very short number of days seems to be responsible for annual rainfall amounts, and the weight of high magnitude events seems to be increased from the 50' or 60' decade.
