ERA5-Land is a reanalysis dataset providing a hourly high resolution information of surface variables over several decades at ~9km grid spacing and covering the period from 1950 to 2-3 months before the present.
ERA5-Land, developed by C3S at ECMWF, has been produced by replaying the land component of the ECMWF ERA5 climate reanalysis. Monthly aggregates of the hourly fields are available.
The ERA5-Land dataset, as any other simulation, provides estimates which have some degree of uncertainty. ERA5-land parameter fields can currently be used in combination with the uncertainty of the equivalent ERA5 fields.