Accurate estimation; Canopy interception; Evapotranspiration models; General circulation model; Meteorological variables; Rainfall estimates; Retrieval algorithms; Space measurements; Earth and Planetary Sciences (all)
Abstract :
[en] Evaporation of intercepted water by canopies accounts for a non-negligible portion of total land surface evapotranspiration. While monitoring evapotranspiration from space technology is increasingly demanded, most evapotranspiration retrieval algorithms face the problem of providing accurate estimation of evaporation from canopy interception. Because of the operations constraints or of the uncertain quality of the near-real-time rainfall estimates from satellites, the implementation of a diagnostic method is preferred to a dynamical model based on a differential equation ruling the evolution of the water storage on the canopy. In this contribution, an empirical model detecting and quantifying intercepted water on canopies, based on one meteorological variable, is optimized with forecasts from a general circulation model. This diagnostic model of interception is implemented in an evapotranspiration retrieval algorithm using mostly space measurements and its impact is commented.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Ghilain, Nicolas ; Université de Liège - ULiège > Sphères ; Meteorological and Climatological Research, Royal Meteorological Institute of Belgium, Brussels, Belgium
Arboleda, A.; Meteorological and Climatological Research, Royal Meteorological Institute of Belgium, Brussels, Belgium
Barrios, J.M.; Meteorological and Climatological Research, Royal Meteorological Institute of Belgium, Brussels, Belgium
Gellens-Meulenberghs, F.; Meteorological and Climatological Research, Royal Meteorological Institute of Belgium, Brussels, Belgium
Language :
English
Title :
Water interception by canopies for remote sensing based evapotranspiration models
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