Computer Simulation of Regional Evapotranspiration by Integrating Landscape Biophysical Attributes with Satellite Data

Evapotranspiration (ET) is an important link between the land-surface energy budget and hydrologic budget. The partitioning of incoming energy into sensible or latent heat substantially influences meteorology from local to global scales. The components of the hydrologie budget that control ET are fairly well understood at local scales (Shuttleworth, 1988). Measurement methods and models exist to describe adequately canopy interception, snowpack dynamics, soil water flux, and ET itself when treated as “point” processes. Even the biological control of ET, primarily manifested through leaf stomatal closure, is now understood reasonably well, and generalized treatment of environmental control functions is available (Jarvis and McNaughton, 1986). However, the challenge is to enlarge our perspective to GCM cell size, macrohydrology as termed by Shuttleworth (1988), which necessitates a new consideration of parameterization of large areas (Eagleson, 1986).

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