Evaluation of canopy temperature—evapotranspiration models over various crops

摘要: Abstract Canopy temperatures, when measured remotely, offer a method of estimating evapotranspiration with surface energy balance models. Equations which have been developed by others evaluated only at limited number locations and few crops. Our study was conducted several weighing lysimeters variety crops around the United States: Brawley, CA; Temple, TX; Lincoln, NE; St. Paul, MN; Fargo, ND; Kimberly, ID; Davis, CA, to evaluate utilizing canopy temperature as an input into balance. The results show that calculated from aerodynamic resistance form well correlated lysimeter measurements all locations. errors using were less than 10% in cases for full ground cover. Bartholic—Namken—Wiegand more closely coupled net radiation temperature. Under partial cover, differences between two models apparent. model overpredicted actual above 200 W m−2 because its insensitivity However, exhibited slight overprediction weighed composite (representative bare soil crop temperature) used. This small could be overcome considering heat flux term. There no location bias model, shows it should work other