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Collection and analysis of evaporative flux data for various climates

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  • Daily evaporative flux and meteorological data from three sites were collected and analyzed. Analysis included evaluation of several reference evapotranspiration estimating methods which were theoretically based on distinct physical laws. The estimating methods included pan evaporation, energy-based Priestly-Taylor, and combination methods with and without biological adjustments. The data set represented three sites with different climates. Analysis included comparisons of evapotranspiration estimating methods, statistical analysis, linear regression analysis, and a detailed study for possible seasonal trends. An attempt to quantify the effect of climate on the original Penman method and the original Priestly-Taylor method using three variables was performed. The variables included average air relative humidity, incoming shortwave radiation, and wind speed at 2 m height. Validation of the derived climatic coefficients for the three sites was performed using a subset of the three data sets and a fourth simulated data set. Moving average analysis for the various evapotranspiration estimating methods was performed at each of the three sites. The objective was to estimate the optimum averaging interval for a particular estimating method at each site. Five days averaging interval was found to be adequate to reduce substantially reduce the standard error of estimate and increase the coefficient of determination for all methods at each site.
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