Comment on: “A review of the complementary principle of evaporation: from the original linear relationship to generalized nonlinear functions” by Han and Tian (2020)

Abstract. The paper by Han and Tian (2020) reviews the history of developments in complementary relationship (CR) between actual potential evaporation introduces generalized principle (GCP) developed authors. This comment assesses whether GCP: (1) can give reasonable results from a wide range surfaces worldwide; (2) is supported experimental data that verify three stages implicit GCP, particularly wet-surface limit; (3) has been proven to be correct authors previous paper; (4) model studies showing wet occur predominantly during periods large-scale moisture convergence. assessment finds arguments favor GCP deserve taken seriously but ultimately remain unconvincing.