The researchers used a model called CRAE to estimate monthly evapotranspiration in an arid oasis. They found that the model accurately calculated both potential and actual evapotranspiration in the Yerqiang Oasis, showing that the complementary relationship between the two is applicable in this arid area. The results of the model closely matched those of a water balance model, indicating its effectiveness in estimating evapotranspiration in such environments.