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In this work, an analysis of the uncertainty of energy flux resulting from post-closure methods of the energy balance: H Method, LE method and Bowen method for the data observed in native grass area of the Pampa biome, located in Santa Maria, RS, Brazil. From these three methods suggest a new one, which we call the Combined Method. This method takes into account the quality classes of eddy covariance to choose the correct method to be applied. The uncertainties of flux were obtained by the difference between the fluxes corrected by one of the post-closure methods and the raw fluxes. The maximum values of the uncertainties occur during the daytime. Regarding the combined method, the highest percentage of cases resulted in the application of correction by Bowen method, followed by the LE method and with less occurrence Method H. Thus, this method can be considered valid to evaluate the uncertainty of simulated fluxes over land surface models.

MÉTODO DE PÓS-FECHAMENTO DO BALANÇO DE ENERGIA PARA AVALIAÇÃO DOS FLUXOS DE MODELOS DA SUPERFÍCIE TERRESTRE