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Please refer always also to UERRA documentation in Copernicus Data Store (CDS) for more information about the data. The UERRA data sets in MARS and CDS should be virtually the same. |
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SMHI datasets (HARMONIE/V1, HARMONIE/V2)
Spin-up issues
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Description: These spin-up problems are in some situations causing too high wind speeds for the 1-2 hour forecasts. This is most pronounced in the wind gust but the problem also occurs for the mean wind at 10 meter altitude. Similar problems can be seen for maximum/minimum temperature. Then in general there is a spin-up problem for precipitation. Here, it is not recommended to use the first 6 hours of the forecasts. Therefore, if a user wants to use the 24 hour accumulated precipitation it is recommended to use the 30-6 hour forecasts. |
Wrong 0% values in relative humidity, cloud cover and albedo fields
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Description: The same issue can be probably found in cloud cover and albedo fields as well but its extent there is not known. |
Missing values in surface sensible heat flux and surface latent heat flux fields
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Overestimation of global radiation and Underestimated cloud cover
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bias is largest over the ocean parts of the North Atlantic and decreases towards the south. It is suspected that the overestimation of global radiation can be a consequence of underestimated cloud cover and investigations are ongoing. Overestimation of relative humidity affecting cloud cover Geopotential height, some time steps errouneous |
MO datasets (UM, UM/En)
The wind directions are wrong by exactly 180 degrees
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Météo-France datasets (MESCAN-SURFEX)
2m temperature and precipitation
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2m temperature:
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Time-integrated surface solar radiation downwards
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Description: The time-integrate surface solar radiation downwards which comprises of both the direct and diffuse short wave radiation reaching the Earth's surface, ought to be positive by definition. Whilst archiving, it was found that it also contains negative values that were traced back to being an artefact from the downscaling from 11 km to 5.5 km. As a work around, we would suggest setting any negative values to zero. |
Land-sea mask to be used to downscale MESCAN-SURFEX fields
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Description: More information and an illustration of potential issues when not using the appropriate LSM can be found in the related C3S support ticket. |
Soil level parameters are inverted with respect to their Y-axis
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Description: |