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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-1larger than the ERA5 transition differences in the troposphere and stratosphere, except near the equator. In the mesosphere, the spread is smaller than the ERA5 transition differences.
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| Fig. 7 Zonal mean specific humidity (log kg kg-1) for ERA5 (contours) and zonal mean specific humidity difference (%) for the overlap (colours), for October to December 2009. The vertical coordinate is the reference pressure of the model levels. | Fig. 8 Zonal mean ozone (log kg kg-1) for ERA5 (contours) and zonal mean ozone difference (%) for the overlap (colours), for October to December 2009. The vertical coordinate is the reference pressure of the model levels. |
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