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The ERA5 transition differences for specific humidity (Fig. 7) are generally below 5 %, apart from at low latitudes in the mesosphere above 0.05 hPa, where differences exceed 10 %. The transition differences for ozone (Fig. 8) are generally below 5 % in the troposphere and stratosphere, except for a few small regions, the most marked being the upper troposphere/lower stratosphere (UTLS) of the tropics and Southern Hemispheresouthern hemisphere. However, the ozone differences are large in the mesosphere in the polar regions, where differences exceed 20 % or even 50 %.
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