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Wrong 0% values in relative humidity, cloud cover and albedo fields
Info

Description:
There are some isolated spots of one or a few grid points with wrong zero values in the fields of relative humidity (both at 2m and on pressure levels). It happened because of a wrong algorithm used for re-computation of the values from 0-1 interval to 0-100% (the supersaturation was set to 100% instead of 0% value).

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
Info

Description:
The sensible heat flux and surface latent heat flux fields  appear to have missing values over the land and because of that should not be used.

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Land-sea mask to be used to downscale MESCAN-SURFEX fields
Info

Description:
The UERRA-HARMONIE reanalyses need to be downscaled from 11km to 5.5km in order to drive the MESCAN-SURFEX system. For that a corresponding land-sea-mask field is needed, which is currently not archived in MARS. As a solution, please download that land-sea-mask field here. We recommend users to apply it for all the MESCAN-SURFEX fields and to focus their analysis on land points only. 

More information and an illustration of potential issues when not using the appropriate LSM can be found in the related C3S support ticket.

MO datasets (UM, UM/En)

2m temperature and precipitation
Info

2m temperature:
Due to biased observational data and a too tolerant quality control, analyzed temperatures can differ severely from other most likely more realistic analysis, e.g. UERRA-HARMONIE or E-OBS. Users are requested to perform additional sanity checks when using this parameter or to switch to the T2m of the UERRA-HARMONIE system. Cold biases are particularly evident in 1965 in Poland and the UK along the coast, and also a warm bias located in 2010 in the Baltic countries. However, other regions and periods might be affected as well.


Precipitation:
Errors have been noticed in the precipitation fields for some areas and time periods. These errors are due to erroneous observations of precipitation equal to zero for long period, which did enter the assimilation procedure. Since the errors are restricted in time and space, the user has to evaluate if the studied time period or region is affected.

The wind directions are wrong by exactly 180 degrees
Info

Description:
The wind directions are wrong by exactly 180 degrees (the direction is the wind is blowing to, rather than where it is blowing from) The U/V components  are not affected.

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Soil level parameters are inverted with respect to their Y-axis
Info

Description:
Both of the fields provided by Météo-France for the UERRA soil levels (Volumetric transpiration stress-onset (soil moisture) and Volumetric wilting point)  are inverted with respect to their Y-axis

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