Changing Trend of Reference Crop Evapotranspiration and Its Dominated Meteorological Variables in Shanxi Province in the Past 55 Years
Abstract：Changing trends of meteorological variables(temperature,relative humidity,sunshine hours and wind speed) and reference crop evapotranspirations(ET0) from 1955—2009 at five meteorological stations,Datong station,Yangquan station,Taiyuan station,Lvliang and Linfen stations,in Shanxi Province were analyzed.Daily ET0 was calculated with FAO Penman-Monteith equation(PM).The dominated meteorological variables causing great changes of ET0 were found using a sensitivity analysis method.Results showed that average air temperature and average relative humidity of the five weather stations in Shanxi Province gradually increased from north to south,while the average wind speed and average sunshine hours gradually decreased from north to south.The average air temperature at the five meteorological stations rose over time with gentle.ET0 of Datong and Yangquan were higher than the others;the difference of average wind speed of the other stations was not significant.Sensitivity analysis on annual ET0 indicated that the relative humidity was the dominated meteorological element to ET0 in Datong,Taiyuan,Lvliang,Yangquan stations,sunshine hours was the dominated element to ET0 in Linfen.The effect of average air temperature on ET0 was not significant.
Keywords：Shanxireference crop evapotranspirationchanging trendsensitivity analysis
Publication Date：2012-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 26-30 )