Author(s): PV Ranpise, DD Khedkar, MS Mane, SD Shinde, KD Kale and RM Gethe

Abstract: Climate change and its possible impact on reference evapotranspiration are the matter of great concern for countries like India where the temperature, relative humidity, windspeed and sunshine hours shows the relationship with the reference evapotranspiration and eventually on water supply. Climatic parameters are the main inputs in the evaluation of reference evapotranspiration. This study determines the relationship between climatic parameters and reference evapotranspiration, (ET₀) on average annual values for nine stations from period of 1980-2022 over a study area, i.e Western Maharashtra. The report considered six climatic parameters namely T_max, T_min, RH_max, RH_min, windspeed and sunshine hours. To study the relationship of climatic parameters with reference evapotranspiration the four types of relationships was used i.e. linear, logarithmic, quadratic and exponential. The results of study indicated that the windspeed showed best fit relationship with ET₀ for Dhule, Jalgaon, Niphad, Rahuri and Solapur stations with higher R² values of 0.869, 0.843, 0.795, 0.346 and 0.811, respectively. Whereas, the bright sunshine hours showed best fit relationship with ET₀ for Pune, Kolhapur, Padegaon and Kasbe Digras station with R² values of 0.837, 0.936, 0.797 and 0.439 respectively. Among different types of relationships i.e. linear, logarithmic, quadratic and exponential, the quadratic type of relationship showed best fit with higher R² values for climatic parameters and ET₀ for all stations.

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