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Eddy covariance using infrared gas analyzes has been a useful tool for gasexchange measurements between soil, vegetation and the atmosphere. So far,comparisons between the open- and closed-path eddy covariance (CP) systemhave been extensively made on CO2 flux estimations, while lacking inthe comparison of water vapor flux estimations. In this study, the specificperformance of water vapor flux measurements of an open-path eddy covariance(OP) system was compared against a CP system over a tall temperate forest innortheastern China. The results show that the fluxes from the OP system(LEop) were generally greater than the LEcp though the two systemsshared one sonic anemometer. The tube delay of closed-path analyzer dependedon relative humidity, and the fixed median time lag contributed to asignificant underestimation of LEcp between the forest and atmosphere,while slight systematic overestimation was also found for covariancemaximization method with single broad time lag search window. After theoptimized time lag compensation was made, the average difference between the30 min LEop and LEcp was generally within 6.0 %. Integrated overthe annual cycle, the CP system yielded a 5.1 % underestimation of forestevapotranspiration as compared to the OP system measurements (493 vs. 469 mm yr−1). This study indicates the importance toestimate the sampling tube delay accurately for water vapor fluxcalculations with closed-path analyzers, and it also suggests that some ofthe imbalance of the surface energy budget in flux sites is possiblycaused by the systematic underestimation of water vapor fluxes measured withclosed-path eddy covariance systems

Comparative measurements of water vapor fluxes over a tall forest using open- and closed-path eddy covariance system