Developing a reference crop evapotranspiration climatology for the southeastern United States using the FAO Penman-Monteith estimation technique
Quality-controlled meteorological observations provided by the State Climate Office of North Carolina were used to model ET using FAO Penman-Monteith. Estimation of ET requires input of daily average solar radiation, daily minimum and maximum temperature, daily average wind speed, daily minimum and maximum relative humidity, Julian day, latitude and longitude, and elevation for each monitoring location. A daily ET climatology for the southeastern United States is developed, and spatial and temporal variability in ET are analyzed for all seasons. To reduce noise, a 7-day moving average is used to provide an estimate of average ET based on all input years. Using Google technology, map and chart displays are developed for public use.