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The equatorial transition differences in eastward wind in ERA-Interim in the lower stratosphere (Fig. 5) are slightly smaller than those in ERA5, though above in the mid to upper stratosphere, the differences are somewhat larger than those in ERA5. In the mesosphere, the transition differences in ERA-Interim are much smaller than those in ERA5. The spread in the eastward wind in the ERA5 EDA 10 member ensemble (Fig. 6) is generally below 2 ms-1 except at low latitudes above about 0.2 hPa, where values can exceed 5 ms-1.
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