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. With respect to ongoing discussions about the causes of energy imbalance and approaches toforce energy balance closure, a method has been proposed that allows partial latent heat fluxclosure (Widmoser and Wohlfahrt, 2018). In the present paper, this method is applied to fourmeasurement stations over grassland under humid and semiarid climates, where lysimeter(LY) and eddy covariance (EC) measurements were taken simultaneously. The results differ significantly from the ones reported in the literature. We distinguish between the resultingEC values being weakly and strongly correlated to LY observations as well assystematic and random deviations between the LY and EC values. Overall, anexcellent match could be achieved between the LY and EC measurements after applyingevaporation-linked weights. But there remain large differences between the standard deviations of theLY and adjusted EC values. For further studies we recommend data collected attime intervals even below 0.5 h. No correlation could be found between evaporation weights and weather indices. Only for somedatasets, a positive correlation between evaporation and the evaporation weight could befound. This effect appears pronounced for cases with high radiation and plant water stress. Without further knowledge of the causes of energy imbalance one might perform full closure usingequally distributed weights. Full closure, however, is not dealt with in this paper.

Partial energy balance closure of eddy covariance evaporation measurements using concurrent lysimeter observations over grassland