![]() Measures of, and indices based upon PET (or the ET of a reference crop under optimal conditions) are widely used in a range of scientific disciplines and practical applications, particularly in agricultural and natural resource management, where it is applied at scales from farm to regional and global 5, 6. These two processes occur simultaneously, with the rates of both dependent on solar radiation, air temperature, relative humidity (i.e., vapor pressure deficit) and wind speed 3, 4, as well as specific crop characteristics and cultivation practices 2. Potential evapotranspiration (PET) is a measure of the ability of the atmosphere to remove water through evapotranspiration (ET) 1, 2, and is the sum of two processes, evaporation and transpiration, which transfer water from the land surface to the atmosphere. Developed using the generally agreed upon standard methodology for estimation of reference ET 0, this database and notably, the accompanying source code, provide a robust tool for a variety of scientific applications in an era of rapidly changing climatic conditions. The current version of the Global-AI_PET_v3 supersedes previous versions, showing a higher correlation to real world weather station data. 83), while showing significant differences to an earlier version of the database. “Climate Research Unit: Time Series v 4.04” ( ET 0 : r 2 = 0. Results were compared for technical validation with weather station data from the FAO “CLIMWAT 2.0 for CROPWAT” ( ET 0 : r 2 = 0. An overview of the methods used to implement the Penman-Monteith equation geospatially and a technical evaluation of the results is provided. The “Global Aridity Index and Potential Evapotranspiration Database - Version 3” (Global-AI_PET_v3) provides high-resolution (30 arc-seconds) global hydro-climatic data averaged (1970–2000) monthly and yearly, based upon the FAO Penman-Monteith Reference Evapotranspiration (ET 0) equation.
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