Spatiotemporal pattern of the global sensitivity of the reference evapotranspiration to climatic variables in recent five decades over China

摘要: The impact of climatic variables on reference evapotranspiration (ET0) has been a critical issue for ages. sensitivities the FAO56 Penman–Monteith ET0 equation to climate in 668 stations China from 1960 2009 were studied using global sensitivity analysis method, extended Fourier amplitude test. results showed large degree spatiotemporal variation incoming solar radiation, temperature (T), relative humidity (RH), and wind speed, with averaged first-order index (Si) value 0.41, 0.18, 0.25, 0.15, respectively. At annul scale, radiation was most sensitive parameter southern part mean Si reached 0.66, while T RH northeast north China, both 0.37. In northwest values T, relatively constant around trended be slightly higher than other parameters (=0.28). Tibetan Plateau, two parameters, 0.32 0.31, spatial varied seasonally, closely related geographic location stations. general, low latitude more less high latitude. merit obtained current study that it estimates which greatest across entire range rather merely based their median values, is helpful better understand potential effects changes water management China.