This dataset provides monthly and zonal mean variables derived from the ERA5 reanalysis, including terms of the transformed Eulerian mean (TEM) momentum budget. All variables (zonal, meridional and vertical wind speed, temperature, zonal wind tendencies from Eliassen-Palm (EP) flux divergence and advection, EP fluxes and the residual streamfunction) are obtained from 6-hourly and native vertical and 0.5 degrees spatial resolution data. Zonal mean wind tendency from parameterizations is also provided (from the forecasts). Data are obtained from the MARS archive. Data are provided as one .zip file per decade (only partial for the 2020s and 1950s). Daily means of the same quantities are provided in a companion dataset (10.5281/zenodo.7081436). The data and related documentation are provided 'as is' and without any warranty of any kind. Users are invited to report any issue or inconsistency they may find. Known issues: - All TEM terms divided by \(\cos(\phi)\), where \(\phi\) is latitude, diverge at the north and south poles (where \(\phi = \pm \pi/2\)), so they should not be considered. If variables at the poles are needed, values at neighbouring latitudes should be taken.

The results contain modified Copernicus Climate Change Service information. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.