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| Fig. 4 Zonal mean eastward wind (ms-1) of the final ERA5 HRES product (contours) and zonal mean eastward wind difference (ms-1) for the final ERA5 HRES product minus the warm up (colours), for October to December 2009. The vertical coordinate is pressure of the model levels. | Fig. 5 Zonal mean zonal wind (ms-1) of the final ERA-Interim product (contours) and zonal mean eastward wind difference (ms-1) for the final ERA-Interim product minus the warm up (colours), for October to December 2009. The vertical coordinate is pressure of the model levels. | Fig. 6 |
Fig. 4 shows the ERA5 zonal mean zonal wind (contours) and difference between the final product and the warm up (colours). In the troposphere and lower stratosphere, between 1000 hPa and 10 hPa, the only region with differences greater than 0.2 ms-1 is a latitudinally confined region near the equator, above about 50 hPa, where the differences of alternating sign are no larger than about 1 ms-1. From the mid-stratosphere to the stratopause (from 10 hPa to 1 hPa), the equatorial differences are slightly larger, with a larger latitudinal extent. However, in the mesosphere (from 1 hPa to 0.01 hPa), the differences are much larger, with peak values greater than 50 ms-1 near the equator at about 0.1 hPa and values greater than 2 ms-1 are widespread.
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