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Evaluation of resistance and mass transport evapo transpiration models requiring canopy temperature data






Agronomy Journal 68(5): 764-769

Evaluation of resistance and mass transport evapo transpiration models requiring canopy temperature data

A resistance model which stems from the work of Brown and Rosenberg and a mass transport (Daltonian) model for estimating evapotranspiration (ET) were tested on large fields of naturally subirrigated alfalfa (Medicago sativa L.). Both models make use of crop canopy temperature data. Temperature data were obtained with an IR thermometer and with leaf thermocouples. A Bowen ratio-energy balance (BREB) model, adjusted to account for underestimation of ET during periods of strong sensible heat advection, was used as the standard against which the resistance and mass transport models were compared. Daily estimates by the resistance model were within 10% of estimates made by the BREB model. Daily estimates by the mass transport model did not agree quite as well. Performance was good on clear and cloudy days and also during periods of nonadvection and strong advection of sensible heat. The performance of the mass transport and resistance models was less satisfactory for estimation of fluxes of latent heat [LE] for short term (15 min) periods. Both models tended to overestimate at low LE fluxes.

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Accession: 005401139



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