Comparative evaluation of FAO56-PM ET0 estimates using meteorological parameters retrieved from MERRA-2 satellite and ground dataset for humid Dehradun region of India
Abstract
In this study conducted with specific objective to compare ET0 estimates obtained at monthly and cropping (kharif, rabi and zaid) season timescales with climatic parameters retrieved from MERRA-2 satellite and ground meteorological dataset with standardized FAO56-PM model for humid Dehradun district of Uttarakhand, it was found that during 29 years study period, about 84.45% months resulted in very good correlation between FAO56-PM ET0 estimates obtained with MERRA-2 satellite parameters and ground meteorological dataset, while about 37.93% and 27.59% kharif seasons were observed under Very Strong Positive and Strong Positive levels, respectively. Similarly, about 93.10% and 6.90% rabi seasons were obtained with Very Strong Positive and Strong Positive correlation coefficient values. For zaid season, about 93.10% seasons showed Very Strong Positive correlation coefficient values. About 99.71% months during study period extended good agreement in terms of Agreement index. On cropping season basis, 55.17% kharif, 62.07%, rabi, and 7.31% zaid seasons respectively showed agreement index values with medium agreement.
