Estimating African daily evapotranspiration using MODIS and MSG data

摘要

A methodology is proposed to estimate African daily evapotranspiration (ET) by merging data from the MODIS onboard the polar-orbiting Terra satellite and the SEVIRI onboard the geostationary-orbiting MSG satellite. The estimated daily ET values are compared with the eddy covariance measurements at four sites (3 savanna sites and 1 forest site) in Africa. Results show a bias of around 1 mm/day between daily ET estimates and ground measurements in warm and humid seasons, but a relatively large bias in cold and dry seasons. This bias may come from uncertainties in daily net radiation and instantaneous evaporation fraction estimations.