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Given this inconsistency in these three parameters on the CDS, we recommend, in general, that the hourly (analysed) "2 metre temperature" be used to construct the minimum and maximum over longer periods, such as a day. However, be aware that with the "2 metre temperature" being an instantaneous parameter, it is given by the time step value on the hour, whereas the "Maximum temperature at 2 metres since previous post-processing" and "Minimum temperature at 2 metres since previous post-processing" are calculated from all the time steps during the hour (3 hours for the ensemble). In ERA5, the time step is 12 minutes (20 minutes for the ensemble), so there are five time steps (three time steps for the ensemble) per hour.
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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 signed on 11/11/2014). 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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