An Enhanced MOD16 Evapotranspiration Model for the Tibetan Plateau During the Unfrozen Season

Evapotranspiration (ET) is composed of soil evaporation (ETs), canopy transpiration (ETc), and intercepted water (ETw), it plays an indispensable role in the energy cycles land surface processes. More accurate estimations variations ET are essential for natural hazard monitoring resource management. An improved algorithm ETs with moisture texture (SMT) optimized ETc based on MOD16 model (MOD16-STM) proposed cold, arid, semiarid regions Tibetan Plateau (TP). The nonlinear relationships between resistance (rss) hydration state different textures were redefined by using five flux tower measurements over TP. value mean potential stomatal conductance per unit leaf area (CL) used calculation grasslands was at 0.0038 (m s−1). MOD16-STM compared a index-based Priestley-Taylor (SWI-PT) independent sites. results showed that half-hourly, daily, monthly from closer to observations than those other two models. indicated increased R2 0.2/0.05 index agreement 0.37/0.23 deceased RMSE 43.89/42.77 W m−2 absolute bias (|MB|) 46.23/45.89 m−2, when daily/monthly scales. suggested will produce more estimates sites has great estimation improvement TP region.