Data associated to the data paper "Eighteen years of upland grassland carbon flux data: reference datasets, processing, and gap-filling procedure".

18-year datasets of climate variables and greenhouse gas (GES) fluxes from an EC tower located in an upland permanent grassland site in the French Massif Central region. The high-frequency raw-data from EC system were processed using EddyPro Software and post-processing using the R packages FReddyPro and REddyProc. The time series was completed by using two imputation techniques: marginal distribution sampling (MDS) for half-hour data and random forest algorithm (RF) for daily data.