Discussion and results

The analysis performed herein stressed the following points.

In the last 20 years precipitation in Campania has decreased by about 15%, although the reduction is not uniformly distributed throughout the region. The most severely affected areas are those at higher elevations. The substantial rainfall reduction is also evident from the trends at stations with rainfall data records from 1920.

The number of rainy days has decreased roughly in the same way as the rate of precipitation. Consequently, rainfall intensity is unchanged in time.

The analysis of temperatures demonstrates a clear increase, of an average of 0.3°C (from 0.2°C

in coastal flat areas to 0.5°C in mountainous areas). These trends are in agreement with the results of the UK Hadley Centre global climate model, running on monthly climatic data from Mediterranean countries (i.e. HadCM2 in De Wrachien et al. 2002). In the southern Mediterranean, this model indicates a rainfall decrease of about 10-15% and a temperature increase of 1.5-2.5°C by the year 2050.

Spring discharge depletions and negative fluctuations of the piezometric surface are recorded in the area. These are important indicators of groundwater resource reduction, but they are also affected by the increase in water resource exploitation.

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