...
A similar comparison for the transition from 1988 to 1989 in ERA-Interim (Fig. 2) reveals, on the whole, differences of a similar magnitude. However, the exception to this is that the differences in the ERA-Interim transition in the lower to mid mesosphere (from 1 to 0.1 hPa, with the latter being the top of the ERA-Interim domain) are generally smaller than in the 2009/2010 ERA5 transition, having magnitudes less than 2 K, except near the equator at about 0.8 hPa where the magnitudes exceed 3 K. The spread in temperature in the ERA5 10 member ensemble (Fig. 3), which gives some indication of the uncertainty, shows that the largest values are located at lower latitudes, in the mid to upper stratosphere, where values exceed 0.8 K. This region merges into a second area of large uncertainty, in the mesosphere of the northern hemisphere, where values exceed 0.7 K in the mid-latitudes of the mid-mesosphere.
