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In summary, the ERA5 transition differences for 2009/2010 in the troposphere and stratosphere are generally smaller than transition differences in ERA-Interim and are generally smaller than the ensemble spread. However, in the mesosphere the transition differences are much larger, exceed those in ERA-Interim and are larger than the ensemble spread. The large differences in the mesosphere are particularly apparent in the polar and equatorial regions. For the latter region, the differences in eastward wind, and possibly temperature too, are related to the spurious equatorial mesospheric jet that this cycle of the IFS (CY41R2) suffers from, particularly in the transition seasons. For more information on this spurious equatorial mesospheric jet, see Section 7 in the ECMWF Technical Memorandum No. 824 Report on Stratosphere Task, Force by T.G. Shepherd, I. Polichtchouk, R.J. Hogan and A.J. Simmons.
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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