Trend Analysis and Identification of the Meteorological Factors Influencing Reference Evapotranspiration

Investigating the trends of reference evapotranspiration (ETo) is fundamental importance for water resource management in agriculture, climate variability analysis, and other hydroclimate-related projects. Moreover, it would be useful understanding sensitivity such to basic meteorological variables, as modifications these variables due change are more easily predictable. This study aims analyze ETo relation different explanatory factors. The used a 17 year-long dataset from station located Piazza Armerina, Sicily, region characterized by Mediterranean climate. First, FAO-Penman-Monteith method was applied estimation ETo. Next, Mann-Kendall test with serial autocorrelation removal Trend-free pre-whitening (TFPW) on which they depend. Sen’s slope also examine magnitude trend monthly its related variables. According obtained results, only showed downward 0.790 mm per year November, while no shown months or seasonal annual time scales. Solar radiation (November Autumn) rainfall (Autumn) trend. (minimum temperature, maximum mean wind speed, relative humidity) an upward both at seasonally scale area. highest lowest coefficients area specific humidity respectively. Specific speed give (44.59%) (0.9%) contribution These results contribute potential possible future footprint