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1. Brief description: Two surface parameters (sea ice cover and sea surface temperature) after the model upgrade to the version CNRM-CM6.1 have higher resolution (1x1) than the other surface parameters (1.5x1.5) in both real-time (since 2020-10-22) and reforecast (model version date 2019-07-01) outputs. That higher resolution is the same as the one agreed for the newly added 9 ocean parameters. 2. Recommendation: If needed, users can retrieve those parameters with the same resolution as other surface parameters (1.5/1.5 degree regular lat-lon grid) by specifying it explicitly in their Web-API requests. |
Wrong 2 metre minimum and maximum temperature
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1. Brief description: After the Meteo-France model upgrade to the version CNRM-CM6, there is an issue with 2 metre minimum and maximum temperature. Those two surface fields (parameters mn2t6 and mx2t6) are identical. Basically, instead of the correct values of 2m Tmin/Tmax, the mean 2-meter temperature over the past 6 hours is provided. This error affects both the real-time data since the real-time forecasts since the 22nd October 2020 and also the corresponding set of the fixed reforecasts (1993-2017) archived under the model version date 2019-07-01 in MARS archive. 2. Recommendation: As this error cannot be easily fixed in the reforecast data, it was decided not to fix for consistency the real-time forecast fields either. A sort of possible workaround for users needing 2m Tmin/Tmax fields at the daily (24-hourly) time step is to compute the minimum (maximum) over the four 6-hourly values of a given day. The result would be less sharp than it should, thus it is not fully satisfactory and correct solution. |
BoM (ammc)
Wrong maximum values of surface air maximum temperature (Tmax) at some points for BoM data
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