Sensitivity Analysis of the Reference Crop Evapotranspiration to Meteorological Factors
LI Ying
LYU Mouchao
ZHANG Haiwen
DENG Zhong
LIU Chuncheng
JIANG Mingliang
Abstract：Calculating the reference crop evapotranspiration (ET0) from the Penman-Monteith formula needs a number of meteorological data and we analyzed the sensitivity of the ET0 to different meteorological factors using weather data measured daily in Xinxiang from 1951 to 2003. We firstly calculated the ET0 using these measured data and the Penman-Monteith formula, and then analyzed its sensitivities to different meteorological factors based on the sensitivity curves and sensitivity coefficients. The results showed that the ET0 was correlated posi-tively with temperature (T), wind speed (U2) and sunshine hours (n), and negatively with the relative humidity (RH). From January to December, the sensitive coefficients of ET0 to RH and WS decreased first and then in-creased, but its sensitive coefficients to SH and T increased first and then decreased. The sensitivity of annual ET0 to meteorological factors was in the order of RH>U2>n>T. Seasonally, the sensitivity of ET0 to meteorological fac-tors was in the order of RH>U2>n>T in the first and fourth quarters, RH>n>U2>T in the second quarter, and RH>n>T>U2 in the third quarter. In critical growing season, the sensitivity of ET0 to meteorological factors was in RH>U2>n>T in January, March and October, and RH>n>U2>T in May.
Keywords：reference crop evapotranspirationmeteorological factorssensitivitysensitivity curvesensitive coefficient
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 94-99 )