Changing Trends and Dominated Meteorological Variables of Reference Crop Evapotranspiration in Beijing Area
In this study, daily reference crop evapotranspiration(ET0) in Beijing from 1951 to 2007 was computed by FAO Penman-Monteith equation (PM)to find the changing trends of meteorological variables and ET0 and the dominated meteorological variables of ET0 by using a sensitivity analysis method. Results showed that in the past 57 years, the relative humidity and daily sunshine hours decreased, the air temperature increased, the average wind speed increased from 1951 to 1972, and then decreased during 1973 to 2007. Although net radiation had negative effect on ET0, the increasing of saturated vapour pressure deficit made ET0 increasing slowly. Sensitivity analysis on yearly ET0 indicated that the relative humidity and air temperature are two dominated meteorological elements to ET0 in Beijing area. Within a year, daily sunshine hours is the dominating element to ET0 in summer (June～Septemer) and air temperature is in other seasons.
reference crop evapotranspiration Penman - Monteith Equation changing trend sensitivity analysis
Luo Yu Liu Haijun Li Yan
Key Laboratory for Water and Sediment Sciences under Ministry of Education, College of Water Science,Beijing Normal University, Beijing, 100875,China
国际会议
郑州
英文
212-218
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）