Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models

摘要: We applied a land water mass balance equation over 59 major river basins during 2003‐9 to estimate evapotranspiration (ET), using as input terrestrial storage anomaly (TWSA) data from the GRACE satellites, precipitation and in situ runoff measurements. found that change cannot be neglected estimation of ET on an annual time step, especially areas with relatively low values. developed spatial regression model by integrating precipitation, temperature satellite-derived normalized difference vegetation index (NDVI) data, used this extrapolate spatio-temporal patterns changes 1982 2009. globally averaged is about 604 mm yr 1 range 558‐650 . From 2009, global was increase at rate 1.10 2 , Amazon regions Southeast Asia showing highest increasing trend. Further analyses, however, show mainly occurred between 1980s 1990s. The trend 2000s, its magnitude or even sign substantially depended choice beginning year. This suggests non-significant last decade.