Estimation of evapotranspiration over the Yellow River's source area from national geostationary meteorological satellite data
摘要
The evapotranspiration(ET) from the source area of the Yellow River was estimated from the national geostationary meteorological satellite data and ground observation for September 2009.The ET estimation uses the energy balance approach.Under clear-sky conditions,the Surface Energy Balance System(SEBS) model can be applied for the ET estimation;whereas under cloudy conditions,the ET estimation is based on the solar radiation for different cloudy conditions,which considers the solar radiation attenuation process in the atmosphere.The result shows that the average daily estimated ET varies between 2.0 mm and 3.0 mm with a single-peak value in the source area,and compares well to the ground measurements with an average relative error of 15.2%.