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Modelling of Seasonal Evapotranspiration from an Agricultural Field Using the Canadian Land Surface Scheme (CLASS) with a Pedotransfer Rule and Multicriteria Optimization

Abstract The performance of the Canadian Land Surface Scheme (CLASS 3.5) was assessed using turbulent fluxes derived from data recorded at two micrometeorological stations located in a potato field in Quebec, Canada. The minimum stomatal resistance, the maximum leaf area index, and the initial water content of the third soil layer were optimized using the Non-Dominated Sorting Genetic Algorithm-II and the mean square error of the latent heat flux. With respect to benchmark solutions, the optimization improved the sensible and latent heat fluxes by 31 and 23%, respectively. The use of a pedotransfer rule in adjustment of the water content of mineral soils having small percentages of organic matter provided better estimates of the evapotranspiration during the growing stage. However, like the original version of the model (without the pedotransfer rule), it underestimated evapotranspiration throughout the maturity stage. It is noteworthy that the original version produced a good estimate of cumulative evapotranspiration over the entire season as a result of over- and underestimates at the beginning and maturity stage of the growing season, respectively.